Form 424B2 - Prospectus [Rule 424(b)(2)]

Share Name	Share Symbol	Market	Type
Exelon Corporation	NASDAQ:EXC	NASDAQ	Common Stock

	Price Change	% Change	Share Price	Bid Price	Offer Price	High Price	Low Price	Open Price	Shares Traded	Last Trade
	-0.12	-0.28%	42.85	42.50	43.45	43.15	42.735	42.95	8,662,045	01:00:00

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The information in this preliminary prospectus supplement is not complete and may be changed. This preliminary prospectus supplement and the accompanying prospectus are not an offer to sell these securities and we are not soliciting an offer to buy these securities in any jurisdiction where the offer or sale is not permitted.

Filed Pursuant to Rule 424(b)(2)

Registration No. 333-266487

Subject to Completion
Preliminary Prospectus Supplement dated February 13, 2025

PROSPECTUS SUPPLEMENT
(To Prospectus Dated May 1, 2024)

Exelon Corporation

$ % Fixed-to-Fixed Reset Rate
Junior Subordinated Notes due 20

Exelon Corporation (“Exelon”) is offering $ aggregate principal amount of our % Fixed-to-Fixed Reset Rate Junior Subordinated Notes due 20 (the “notes”). The notes will bear interest (i) from and including February , 2025 (the “original issue date”) to, but excluding, , 20 at the rate of % per annum and (ii) from and including , 203 , during each Reset Period (as defined herein) at a rate per annum equal to the Five-year U.S. Treasury Rate (as defined herein) as of the most recent Reset Interest Determination Date (as defined herein) plus a spread of %, to be reset on each Reset Date (as defined herein), and will mature on March 15, 20 . Interest on the notes will be payable semi-annually in arrears on March 15 and September 15 of each year, beginning on September 15, 2025.

So long as no event of default (as defined herein) with respect to the notes has occurred and is continuing, we may, at our option, defer interest payments on the notes, from time to time, for one or more deferral periods of up to 20 consecutive semi-annual Interest Payment Periods (as defined herein) each. During any deferral period, interest on the notes will continue to accrue at the then-applicable interest rate on the notes (as reset from time to time on any Reset Date occurring during such deferral period in accordance with the terms of the notes) and, in addition, interest on deferred interest will accrue at the then-applicable interest rate on the notes (as reset from time to time on any Reset Date occurring during such deferral period in accordance with the terms of the notes), compounded semi-annually, to the extent permitted by applicable law. See “Description of the Notes — Option to Defer Interest Payments.”

The notes will be issued in denominations of $2,000 and integral multiples of $1,000 in excess thereof.

At our option, we may redeem the notes at the times and at the applicable redemption prices described in this prospectus supplement. The notes will be our unsecured obligations and will rank junior and subordinated in right of payment to the prior payment in full of our existing and future Senior Indebtedness (as defined herein). The notes will rank equally in right of payment with any future unsecured indebtedness that we may incur from time to time if the terms of such indebtedness provide that it ranks equally with the notes in right of payment.

We do not intend to list the notes on any securities exchange or automated dealer quotation system. The notes will be new securities for which there currently is no public market.

Investing in our notes involves certain risks. You should carefully read this prospectus supplement and the accompanying base prospectus, including the documents incorporated by reference herein and therein, before you make your investment decision. See the “Risk Factors” section beginning on page S-11 of this prospectus supplement, as well as under “Risk Factors” in our Annual Report on Form 10-K for the year ended December 31, 2024, which is incorporated by reference herein, for more information.

Price to
Public(1)

Underwriting
Discount

Proceeds, before
expenses, to
Exelon

Per Note

Total

Per Note

Total

Per Note

Total

Per note

(1)

Plus accrued interest from February , 2025, if settlement occurs after that date.

Neither the Securities and Exchange Commission (the “SEC”) nor any state securities commission has approved or disapproved of these securities or determined if this prospectus supplement or the accompanying prospectus is truthful or complete. Any representation to the contrary is a criminal offense.

The notes are expected to be delivered in book-entry form only through the facilities of The Depository Trust Company (“DTC”), including Clearstream Banking S.A. (“Clearstream”), and/or Euroclear Bank S.A./N.V. (“Euroclear”), against payment in New York, New York on or about February , 2025.

Joint Book-Runners

Barclays

Citigroup

Goldman Sachs & Co. LLC

J.P. Morgan

Morgan Stanley

Credit Agricole CIBRBC Capital Markets Wells Fargo Securities

Senior Co-Managers

Loop Capital MarketsM&T Securities

The date of this prospectus supplement is February , 2025.

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We urge you to carefully read this prospectus supplement and the accompanying prospectus, which describe the terms of the offering of the notes, before you make your investment decision. This prospectus supplement, the accompanying prospectus and any related free writing prospectus required to be filed with the SEC that we prepare or authorize contain and incorporate by reference information that you should consider when making your investment decisions. We have not, and the underwriters have not, authorized anyone else to provide you with different information. If anyone provides you with different or inconsistent information, you should not rely on it. We are not, and the underwriters are not, making an offer to sell these notes in any jurisdiction where the offer or sale is not permitted. You should not assume that the information appearing in this prospectus supplement, the accompanying prospectus and any related free writing prospectus is accurate as of any date other than the date on the front of those documents or that the information incorporated by reference is accurate as of any date other than the date that the document incorporated by reference was filed with the SEC. Our business, financial condition, results of operations and prospects may have changed since those respective dates.

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Prospectus Supplement

	Page
ABOUT THIS PROSPECTUS SUPPLEMENT		S-1
FORWARD LOOKING STATEMENTS		S-3
SUMMARY		S-5
SUMMARY FINANCIAL INFORMATION		S-6
THE OFFERING		S-7
RISK FACTORS		S-11
USE OF PROCEEDS		S-15
CAPITALIZATION		S-16
DESCRIPTION OF THE NOTES		S-17
MATERIAL U.S. FEDERAL INCOME TAX CONSIDERATIONS		S-31
UNDERWRITING		S-37
LEGAL MATTERS		S-43
EXPERTS		S-43
WHERE YOU CAN FIND MORE INFORMATION		S-43
DOCUMENTS INCORPORATED BY REFERENCE		S-43

Prospectus

	ABOUT THIS PROSPECTUS					1
	FORWARD-LOOKING STATEMENTS					1
	RISK FACTORS					2
	EXELON CORPORATION					2
	COMMONWEALTH EDISON COMPANY					2
	POTOMAC ELECTRIC POWER COMPANY					2
	USE OF PROCEEDS					2
	DESCRIPTION OF SECURITIES					3
	PLAN OF DISTRIBUTION					19
	LEGAL MATTERS					21
	EXPERTS					21
	WHERE YOU CAN FIND MORE INFORMATION					21
	DOCUMENTS INCORPORATED BY REFERENCE					22

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ABOUT THIS PROSPECTUS SUPPLEMENT

This prospectus supplement and the accompanying prospectus contain information about Exelon and the notes offered hereby. This prospectus supplement and the accompanying prospectus also refer to information contained in other documents that we file with the SEC. To the extent the information in this prospectus supplement is inconsistent with information in the prospectus, you should rely on this prospectus supplement.

Notice to Prospective Investors in the European Economic Area

This prospectus supplement, the accompanying prospectus and any related free writing prospectus is not a prospectus for the purposes of Regulation (EU) 2017/1129 (the “Prospectus Regulation”). This prospectus supplement, the accompanying prospectus and any related free writing prospectus have been prepared on the basis that any offer of notes in any Member State of the European Economic Area (the “EEA”) will only be made to a legal entity that is a qualified investor under the Prospectus Regulation (“EEA Qualified Investors”). Accordingly, any person making or intending to make an offer in that Member State of notes that are the subject of the offering contemplated in this prospectus supplement, the accompanying prospectus and any related free writing prospectus may only do so with respect to EEA Qualified Investors. Neither Exelon nor the underwriters have authorized, nor do they authorize, the making of any offer of notes other than to EEA Qualified Investors.

PROHIBITION OF SALES TO EEA RETAIL INVESTORS — The notes are not intended to be offered, sold or otherwise made available to and should not be offered, sold or otherwise made available to any retail investor in the EEA. For these purposes, a retail investor means a person who is one (or more) of: (i) a retail client as defined in point (11) of Article 4(1) of Directive 2014/65/EU, as amended (“MiFID II”); or (ii) a customer within the meaning of Directive (EU) 2016/97, as amended (the “Insurance Distribution Directive”), where that customer would not qualify as a professional client as defined in point (10) of Article 4(1) of MiFID II; or (iii) not a qualified investor as defined in the Prospectus Regulation. Consequently, no key information document required by Regulation (EU) No 1286/2014, as amended (the “PRIIPs Regulation”) for offering or selling the notes or otherwise making them available to retail investors in the EEA has been prepared and therefore offering or selling the notes or otherwise making them available to any retail investor in the EEA may be unlawful under the PRIIPs Regulation.

Notice to Prospective Investors in the United Kingdom

This prospectus supplement, the accompanying prospectus and any related free writing prospectus is not a prospectus for the purposes of Regulation (EU) 2017/1129 as it forms part of domestic law in the United Kingdom by virtue of the European Union (Withdrawal) Act 2018, as amended by the European Union (Withdrawal Agreement) Act 2020 (the “EUWA”) (the “UK Prospectus Regulation”). This prospectus supplement, the accompanying prospectus and any related free writing prospectus have been prepared on the basis that any offer of notes in the United Kingdom will only be made to a legal entity that is a qualified investor under the UK Prospectus Regulation (“UK Qualified Investors”). Accordingly, any person making or intending to make an offer in the United Kingdom of notes that are the subject of the offering contemplated in this prospectus supplement, the accompanying prospectus and any related free writing prospectus may only do so with respect to UK Qualified Investors. Neither Exelon nor the underwriters have authorized, nor do they authorize, the making of any offer of notes other than to UK Qualified Investors.

PROHIBITION OF SALES TO UNITED KINGDOM RETAIL INVESTORS — The notes are not intended to be offered, sold or otherwise made available to and should not be offered, sold or otherwise made available to any retail investor in the United Kingdom. For these purposes, a retail investor means a person who is one (or more) of: (i) a retail client, as defined in point (8) of Article 2 of Regulation (EU) No 2017/565 as it forms part of domestic law by virtue of the EUWA; or (ii) a customer within the meaning of the provisions of the United Kingdom’s Financial Services and Markets Act 2000, as amended (the “FSMA”) and any rules or regulations made under the FSMA to implement the Insurance Distribution Directive, where that customer would not qualify as a professional client, as defined in point (8) of Article 2(1) of Regulation (EU) No 600/2014 as it forms part of domestic law by virtue of the EUWA; or (iii) not a qualified investor as defined in Article 2 of the UK Prospectus Regulation. Consequently no key information document required by Regulation (EU) No 1286/2014 as it forms part of domestic law by virtue of the

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EUWA (the “UK PRIIPs Regulation”) for offering or selling the notes or otherwise making them available to retail investors in the United Kingdom has been prepared and therefore offering or selling the notes or otherwise making them available to any retail investor in the United Kingdom may be unlawful under the UK PRIIPs Regulation.

The communication of this prospectus supplement, the accompanying prospectus, any related free writing prospectus and any other document or materials relating to the issue of the notes offered hereby is not being made, and such documents and/or materials have not been approved, by an authorized person for the purposes of section 21 of the FSMA. Accordingly, such documents and/or materials are not being distributed to, and must not be passed on to, the general public in the United Kingdom. This document and such other documents and/or materials are for distribution only to persons who (i) have professional experience in matters relating to investments and who fall within the definition of investment professionals (as defined in Article 19(5) of the Financial Services and Markets Act 2000 (Financial Promotion) Order 2005, as amended (the “Financial Promotion Order”)), (ii) fall within Article 49(2)(a) to (d) of the Financial Promotion Order, (iii) are outside the United Kingdom or (iv) are any other persons to whom an invitation or inducement to engage in investment activity (within the meaning of section 21 of the FSMA) in connection with the issue or sale of any notes may otherwise lawfully be made under the Financial Promotion Order (all such persons together being referred to as “relevant persons”). This document is directed only at relevant persons and must not be acted on or relied on by persons who are not relevant persons. Any investment or investment activity to which this prospectus supplement, the accompanying prospectus, any related free writing prospectus and any other document or materials relates is available only to relevant persons and will be engaged in only with, relevant persons. Any person in the United Kingdom that is not a relevant person should not act or rely on this prospectus supplement, the accompanying prospectus or any related free writing prospectus or any of their contents.

The accompanying prospectus also includes information about our subsidiaries, Commonwealth Edison Company (ComEd), and Potomac Electric Power Company (Pepco) and their securities. Exelon, ComEd and Pepco file combined reports under the Securities Exchange Act of 1934, as amended (the “Exchange Act”). Information contained in the combined reports relating to each registrant is filed separately by such registrant on its own behalf and only the information related to Exelon is incorporated by reference in this prospectus supplement and the accompanying prospectus. Exelon does not make any representations as to information relating to any other registrant or securities issued by any other registrant and you should not rely on any information relating to any registrant other than Exelon in determining whether to invest in the notes offered hereby.

When we refer to “Exelon,” “the Company,” “we,” “us” or “our” in this prospectus supplement, we mean Exelon and, unless the context otherwise indicates, does not include any of our subsidiaries or affiliates.

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FORWARD LOOKING STATEMENTS

This prospectus supplement, the accompanying prospectus and the documents incorporated or deemed incorporated by reference as described under the heading “Where You Can Find More Information” contain forward-looking statements within the meaning of federal securities laws. Words such as “could,” “may,” “expects,” “anticipates,” “will,” “targets,” “goals,” “projects,” “intends,” “plans,” “believes,” “seeks,” “estimates,” “predicts,” “should,” and variations on such words, and similar expressions that reflect our current views with respect to future events and operational, economic and financial performance, are intended to identify forward-looking statements but are not the only means to identify those statements. These forward- looking statements are based on assumptions, expectations and assessments made by our management in light of their experience and their perception of historical trends, current conditions, expected future developments and other factors they believe to be appropriate. Any forward-looking statements are not guarantees of our future performance and are subject to risks and uncertainties. Accordingly, any such statements are qualified in their entirety by reference to, and are accompanied by, the following important factors that may cause our actual results or outcomes to differ materially from those contained in our forward-looking statements, including, but not limited to:

•

unfavorable legislative and/or regulatory actions;

•

uncertainty as to outcomes and timing of regulatory approval proceedings and/or negotiated settlements thereof;

•

environmental liabilities and remediation costs;

•

state and federal legislation requiring use of low-emission, renewable, and/or alternate fuel sources and/or mandating implementation of energy conservation programs requiring implementation of new technologies;

•

challenges to tax positions taken, tax law changes, and difficulty in quantifying potential tax effects of business decisions;

•

negative outcomes in legal proceedings;

•

adverse impact of the activities associated with the past deferred prosecution agreement and now-resolved SEC investigation on Exelon’s and ComEd’s reputation and relationships with legislators, regulators, and customers;

•

physical security and cybersecurity risks;

•

extreme weather events, natural disasters, operational accidents such as wildfires or natural, gas explosions, war, acts and threats of terrorism, public health crises, epidemics, pandemics, or other significant events;

•

lack of sufficient capacity to meet actual or forecasted demand or disruptions at power generation facilities owned by third parties;

•

emerging technologies that could affect or transform the energy industry;

•

instability in capital and credit markets;

•

a downgrade of any registrant’s credit ratings or other failure to satisfy the credit standards in the registrants’ agreements or regulatory financial requirements;

•

significant economic downturns or increases in customer rates;

•

impacts of climate change and weather on energy usage and maintenance and capital costs; and

•

impairment of long-lived assets, goodwill, and other assets.

New factors emerge from time to time, and it is impossible for us to predict all of such factors, nor can we assess the impact of each such factor on the business or the extent to which any factor, or combination of factors, may cause actual results to differ materially from those contained in any forward-looking statements. For more information about the factors that could cause actual results to differ materially from the forward-looking statements made by Exelon, see the factors discussed herein, as well as the items discussed in (1) Exelon’s 2024 Annual Report on Form 10-K in (a) Part I, ITEM 1A. Risk Factors, (b) Part II,

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ITEM 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations, and (c) Part II, ITEM 8. Financial Statements and Supplementary Data: Note 18, Commitments and Contingencies and (2) other factors discussed in filings with the SEC by Exelon.

You are cautioned not to place undue reliance on these forward-looking statements, which apply only as of the date on the front of this prospectus supplement or, as the case may be, as of the date on which we make any subsequent forward-looking statement that is deemed incorporated by reference. We do not undertake any obligation to update or revise any forward-looking statement to reflect events or circumstances after the date as of which any such forward-looking statement is made.

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SUMMARY

The following summary is provided solely for your convenience. It is not intended to be complete and may not contain all of the information that you should consider before investing in the notes. You should read carefully this entire prospectus supplement, the accompanying prospectus and all the information included or incorporated by reference herein or therein.

Our Company

Exelon, incorporated in Pennsylvania in February 1999, is a utility services holding company engaged in energy distribution and transmission businesses through ComEd, PECO Energy Company (“PECO”), Baltimore Gas and Electric Company (“BGE”), Pepco, Delmarva Power & Light Company (“DPL”) and Atlantic City Electric Company (“ACE”) (collectively, the “Utility Registrants”). Exelon’s principal executive offices are located at 10 South Dearborn Street, Chicago, Illinois 60603, and its telephone number is 800-483-3220.

ComEd’s energy delivery business consists of the purchase and regulated retail sale of electricity and the provision of electricity transmission and distribution services to retail customers in northern Illinois, including the City of Chicago.

PECO’s energy delivery business consists of the purchase and regulated retail sale of electricity and the provision of electricity transmission and distribution services to retail customers in southeastern Pennsylvania, including the City of Philadelphia, as well as the purchase and regulated retail sale of natural gas and the provision of natural gas distribution services to retail customers in the Pennsylvania counties surrounding the City of Philadelphia.

BGE’s energy delivery business consists of the purchase and regulated retail sale of electricity and natural gas and the transmission and distribution of electricity and distribution of natural gas to retail customers in central Maryland, including the City of Baltimore.

Pepco’s energy delivery business consists of the purchase and regulated retail sale of electricity and the transmission and distribution of electricity to retail customers in the District of Columbia and major portions of Prince George’s County and Montgomery County in Maryland.

DPL’s energy delivery business consists of the purchase and regulated retail sale of electricity and the transmission and distribution of electricity to retail customers in portions of Delaware and Maryland, and the purchase and regulated retail sale of natural gas and distribution of natural gas to retail customers in portions of New Castle County in Delaware.

ACE’s energy delivery business consists of the purchase and regulated retail sale of electricity and the transmission and distribution of electricity to retail customers in portions of southern New Jersey.

The Separation

On February 21, 2021, Exelon’s Board of Directors approved a plan to separate (“the separation”) the Utility Registrants and Constellation Energy Generation, LLC, a Pennsylvania limited liability company (“Generation”). Exelon completed the separation on February 1, 2022, creating two publicly traded companies, Exelon and Constellation Energy Corporation. Constellation Energy Corporation was newly formed and incorporated in Pennsylvania on June 15, 2021 for the purpose of the separation and holds Generation.

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SUMMARY FINANCIAL INFORMATION

We have provided the following summary financial information for your reference. We have derived the summary information presented here as of and for the years ended December 31, 2024, 2023 and 2022, as applicable, from our audited consolidated financial statements, incorporated herein by reference. You should read this summary information together with our audited consolidated financial statements, each incorporated herein by reference. See “Where You Can Find More Information” in this prospectus supplement.

	For the Year Ended December 31,
	2024			2023			2022
Statement of Operations Data
Total Operating revenues		$	23,028		$	21,727		$	19,078
Operating income			4,319			4,023			3,315
Net income from continuing operations after income taxes			2,460			2,328			2,054
Net income from discontinued operations after income taxes			—			—			117
Net income			2,460			2,328			2,171
Cash Flow Data
Net cash flows provided by operating activities			5,569			4,703			4,870
Net cash flows used in investing activities			(7,042)			(7,375)			(6,990)
Net cash flows provided by financing activities.			1,311			2,683			1,591

	As of December 31,
	2024			2023
Balance Sheet Data
Property, plant and equipment (net)		$	78,182		$	73,593
Noncurrent regulatory assets			8,710			8,698
Goodwill			6,630			6,630
Total assets			107,784			101,856
Long-term debt, including long-term debt to financing trusts and long-term debt due within one year			44,790			41,485
Noncurrent regulatory liabilities			10,198			9,576
Total shareholders’ equity			26,921			25,755
Total liabilities and shareholders’ equity			107,784			101,856

See also Note 2 — Discontinued Operations of the Combined Notes to Consolidated Financial Statements contained in Exelon’s Annual Report on Form 10-K for the year ended December 31, 2024 for additional information on how the separation affects the summary financial information set forth herein.

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THE OFFERING

The following summary contains basic information about the notes and this offering. It does not contain all of the information that may be important to you. For a more complete understanding of this offering, we encourage you to read this entire prospectus supplement and the accompanying prospectus, including “Description of the Notes.”

Issuer

Exelon Corporation

Securities Offered

$ aggregate principal amount of % Fixed-to-Fixed Reset Rate Junior Subordinated Notes due 20 (the “notes”).

Maturity Date

The notes will mature on March 15, 20 .

Interest Rate

The notes will bear interest (i) from and including February , 2025 to, but excluding, , 20 (the “First Reset Date”) at the rate of % per annum and (ii) from and including the First Reset Date, during each Reset Period at a rate per annum equal to the Five-year U.S. Treasury Rate as of the most recent Reset Interest Determination Date plus a spread of %, to be reset on each Reset Date. For the definitions of the terms “Reset Period,” “Five-year U.S. Treasury Rate,” “Reset Interest Determination Date” and “Reset Date” and for other important information concerning the calculation of interest on the notes, see “Description of the Notes — Interest Rate and Maturity” in this prospectus supplement.

Interest Payment Dates

Subject to our right to defer interest payments as described under “Optional Interest Deferral” below, interest on the notes will be payable semi-annually in arrears on March 15 and September 15 of each year, beginning on September 15, 2025.

Optional Interest Deferral

So long as no event of default with respect to the notes has occurred and is continuing, we may, at our option, defer interest payments on the notes, from time to time, for one or more deferral periods of up to 20 consecutive semi-annual Interest Payment Periods each (each such deferral period, commencing on the interest payment date on which the first such deferred interest payment otherwise would have been made, an “Optional Deferral Period”), except that no such Optional Deferral Period may extend beyond the final maturity date of the notes or end on a day other than the day immediately preceding an interest payment date. In other words, we may declare at our discretion up to a ten-year interest payment moratorium on the notes and may choose to do that on one or more occasions. No interest will be due or payable on the notes during any such Optional Deferral Period unless we elect, at our option, to redeem notes during such Optional Deferral Period, in which case accrued and unpaid interest to, but excluding, the redemption date will be due and payable on such redemption date only on the notes being redeemed, or unless the principal of and interest on the notes shall have been declared due and payable as the result of an event of default with respect to the notes, in which case all accrued and unpaid interest on the notes shall become due and payable. We may elect, at our option, to extend the length of any Optional Deferral Period that is shorter than 20 consecutive semi-annual Interest Payment Periods (so long as the entire Optional Deferral Period does not exceed 20 consecutive semi-annual Interest Payment Periods or extend beyond the final maturity date of the notes) and

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to shorten the length of any Optional Deferral Period. We cannot begin a new Optional Deferral Period until we have paid all accrued and unpaid interest on the notes from any previous Optional Deferral Period. During any Optional Deferral Period, interest on the notes will continue to accrue at the then-applicable interest rate on the notes (as reset from time to time on any Reset Date occurring during such Optional Deferral Period in accordance with the terms of the notes). In addition, during any Optional Deferral Period, interest on the deferred interest will accrue at the then-applicable interest rate on the notes (as reset from time to time on any Reset Date occurring during such Optional Deferral Period in accordance with the terms of the notes), compounded semi-annually, to the extent permitted by applicable law. For the definition of the term “event of default,” see “Description of the Notes — Events of Default” in this prospectus supplement, and for the definition of the term “Interest Payment Period” and other important information concerning our right to defer interest payments on the notes, see “Description of the Notes — Option to Defer Interest Payments” in this prospectus supplement.

If we exercise our option to defer payments of interest on the notes, the notes will be treated at that time, solely for purposes of the original issue discount rules, as having been retired and reissued with original issue discount for U.S. federal income tax purposes. This means that if you are subject to U.S. federal income taxation on a net income basis, you would be required to include in your gross income for U.S. federal income tax purposes the deferred interest payments on your notes before you receive any cash, regardless of your regular method of accounting for U.S. federal income tax purposes. For more information concerning the tax consequences you may have if payments of interest are deferred, see “Risk Factors — Holders of the notes subject to U.S. federal income taxation may have to pay taxes on interest before they receive payments from us” and “Material United States Federal Income Tax Considerations — U.S. Holders — Original Issue Discount” in this prospectus supplement.

Certain Restrictions during an Optional Deferral Period

During an Optional Deferral Period, we may not do any of the following (subject to exceptions):

•

declare or pay any dividends or distributions on any Capital Stock (as defined in “Description of the Notes — Option to Defer Interest Payments”) of Exelon;

•

redeem, purchase, acquire or make a liquidation payment with respect to any Capital Stock of Exelon;

•

pay any principal, interest or premium on, or repay, repurchase or redeem, any indebtedness of Exelon that ranks equally with or junior to the notes in right of payment; or

•

make any payments with respect to any guarantees by Exelon of any indebtedness if such guarantees rank equally with or junior to the notes in right of payment.

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Optional Redemption

At our option, we may redeem some or all of the notes, as applicable, before their maturity, as follows:

•

in whole or in part (i) on any day in the period commencing on the date falling 90 days prior to the First Reset Date and ending on and including the First Reset Date and (ii) after the First Reset Date, on any interest payment date, at a redemption price in cash equal to 100% of the principal amount of the notes being redeemed, plus, subject to the terms described in the first paragraph under “Description of the Notes — Redemption — Redemption Procedures” in this prospectus supplement, accrued and unpaid interest on the notes to be redeemed to, but excluding, the redemption date;

•

in whole but not in part, at any time following the occurrence and during the continuance of a Tax Event (as defined in “Description of the Notes — Redemption — Redemption Following a Tax Event” in this prospectus supplement) at a redemption price in cash equal to 100% of the principal amount of the notes, plus, subject to the terms described in the first paragraph under “Description of the Notes — Redemption — Redemption Procedures” in this prospectus supplement, accrued and unpaid interest on the notes to, but excluding, the redemption date; and

•

in whole but not in part, at any time following the occurrence and during the continuance of a Rating Agency Event (as defined in “Description of the Notes — Redemption — Redemption Following a Rating Agency Event” in this prospectus supplement) at a redemption price in cash equal to 102% of the principal amount of the notes, plus, subject to the terms described in the first paragraph under “Description of the Notes — Redemption — Redemption Procedures” in this prospectus supplement, accrued and unpaid interest on the notes to, but excluding, the redemption date.

Ranking

The notes will be our unsecured obligations and will rank junior and subordinate in right of payment to the prior payment in full of our existing and future Senior Indebtedness, to the extent and in the manner set forth under the caption “Description of the Notes — Subordination” in this prospectus supplement. For the definition of the term “Senior Indebtedness,” see “Description of the Notes — Subordination” in this prospectus supplement. Because we are a holding company with no material assets other than our ownership interests in our subsidiaries and all of our operations are conducted by our subsidiaries, our debt is effectively subordinated to all existing and future debt, trade creditors, and other liabilities of our subsidiaries. Our rights, and hence the rights of our creditors, to participate in any distribution of assets of any subsidiary upon its liquidation or reorganization or otherwise would be subject to the prior claims of that subsidiary’s creditors, except to the extent that our claims as a creditor of such subsidiary may be recognized. As of December 31, 2024, our subsidiaries had outstanding approximately $32.6 billion of long-term debt, including long-term debt to financing trusts and the portion of long-term debt due within one year. The notes will not be obligations of or guaranteed by any of our subsidiaries. The indenture between Exelon, as issuer, and The

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Bank of New York Mellon Trust Company, N.A., as trustee (the “trustee”), dated as of June 17, 2014 (the “Indenture”) does not limit our ability to issue debt senior to the notes or the amount of debt we or our subsidiaries may issue.

Denominations

The notes will be issued in minimum denominations of $2,000 and integral multiples of $1,000 in excess thereof.

Additional Notes

Subject to the limitations described in this prospectus supplement and the accompanying prospectus, we may issue additional notes under the Indenture with the same priority as the notes offered hereby, including notes having the same series designation and terms (except for the public offering prices and the issue date) as the notes offered hereby, without the approval of the holders of outstanding notes under the Indenture, including the holders of the outstanding notes offered hereby.

No Listing

We do not intend to list the notes on any securities exchange or automated dealer quotation system. The notes will be new securities for which there currently is no public market. See “Risk Factors — There may be no public market for the notes.”

Use of Proceeds

We estimate that the net proceeds from the sale of the notes in this offering will be approximately $ , after deducting the underwriting discount but before deducting other offering expenses. A portion of the net proceeds from the sale of the notes, together with available cash balances, will be used to repay $464 million of currently outstanding commercial paper borrowings having an approximate weighted average interest rate of 4.537% per annum as of February 11, 2025. The remainder of the net proceeds will be used for general corporate purposes. See “Use of Proceeds.”

Risk Factors

You should consider carefully all the information set forth and incorporated by reference in this prospectus supplement and the accompanying prospectus and, in particular, you should evaluate the specific factors set forth under the heading “Risk Factors” beginning on page S-10 of this prospectus supplement, as well as the other information contained or incorporated herein by reference, before investing in the notes offered hereby.

Trustee

The Bank of New York Mellon Trust Company, N.A.

Governing Law

The Indenture and the notes will be governed by the laws of the State of New York.

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RISK FACTORS

Investing in the notes involves risks. You should carefully consider the following discussion and the risks described under “Risk Factors” in our Annual Report on Form 10-K for the year ended December 31, 2024, incorporated by reference in this prospectus supplement and the accompanying prospectus, the factors listed under “Forward Looking Statements” in this prospectus supplement and the other information contained or incorporated by reference in this prospectus supplement and the accompanying prospectus before making a decision to invest in the notes. There may be other risks and uncertainties not known to us or that we deem immaterial that also could impair our business operations, financial results and the value of our securities. The occurrence of any of these risks could have a material adverse effect on our results of operations, financial condition, cash flows and/or prospects and might cause you to lose all or part of your investment in the notes. See “Where You Can Find More Information.”

General market conditions may adversely affect the market prices of the notes and there may be no public market for the notes.

We can give no assurances concerning the future market prices of the notes, the liquidity of any markets that may develop for the notes offered by this prospectus supplement, the ability of any investor to sell any of the notes or the price at which investors would be able to sell them. The condition of the financial markets and prevailing interest rates have fluctuated in the past and are likely to fluctuate in the future, which could have an adverse effect on the market prices of the notes. If markets for the notes do not develop, investors may be unable to resell the notes for an extended period of time, if at all. If markets for the notes do develop, they may not continue or it may not be sufficiently liquid to allow holders to resell any of the notes. Consequently, investors may not be able to liquidate their investment readily, and lenders may not readily accept the notes as collateral for loans.

The Indenture does not restrict the amount of additional debt that we may incur.

The notes and Indenture pursuant to which the notes will be issued do not place any limitation on the amount of indebtedness that we or our subsidiaries may incur. Our incurrence of additional debt may have important consequences for you as a holder of the notes, including making it more difficult for us to satisfy our obligations with respect to the notes, a loss in the trading value of your notes and a risk that one or more of the credit ratings of the notes are lowered or withdrawn.

The notes are subordinated or effectively subordinated to all other indebtedness of Exelon and its subsidiaries (other than any unsecured indebtedness Exelon has incurred or may in the future incur that ranks junior to or pari passu with the notes).

Pursuant to the terms of the Indenture, the notes will be subordinated in right of payment to all of Exelon’s existing and future Senior Indebtedness (as defined under “Description of the Notes — Subordination”). This means that, in the event of (a) Exelon’s dissolution, winding-up, liquidation or reorganization, (b) Exelon’s failure to pay any interest, principal or other monetary amounts due on any of its Senior Indebtedness when due (and continuance of that default beyond any applicable grace period) or (c) acceleration of the maturity of any of Exelon’s Senior Indebtedness as a result of a default, Exelon will not be permitted to make any payments on the notes until, in the case of clause (a), all amounts due or to become due on all of its Senior Indebtedness have been paid in full, or, in the case of clauses (b) and (c), all amounts due on its Senior Indebtedness have been paid in full. For additional information about the subordination of the notes to our Senior Indebtedness, see “Description of the Notes — Subordination” in this prospectus supplement. At December 31, 2024, Exelon had approximately $12.1 billion aggregate principal amount of Senior Indebtedness outstanding. In addition, the notes will be effectively subordinated in right of payment to any secured indebtedness Exelon may in the future incur (to the extent of the value of the collateral securing such secured indebtedness). Due to the subordination of the notes to the Senior Indebtedness of Exelon and the effective subordination of the notes to any secured indebtedness of Exelon, if Exelon’s assets are distributed upon its dissolution, winding-up, liquidation or reorganization, holders of its Senior Indebtedness and any secured indebtedness would likely recover more, ratably, than the holders of the notes, and it is possible that no payments would be made to the holders of the notes.

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Because we are a holding company with no material assets other than our ownership interests in our subsidiaries and all of our operations are conducted by our subsidiaries, our debt is effectively subordinated to all existing and future debt, trade creditors, and other liabilities of our subsidiaries. Our rights, and hence the rights of our creditors, to participate in any distribution of assets of any subsidiary upon its liquidation or reorganization or otherwise would be subject to the prior claims of that subsidiary’s creditors, except to the extent that our claims as a creditor of such subsidiary may be recognized. As of December 31, 2024, our subsidiaries had outstanding approximately $32.6 billion of long-term debt, including long-term debt to financing trusts and the portion of long-term debt due within one year. The Indenture does not restrict our or our subsidiaries’ ability to incur additional indebtedness.

The interest rate on the notes will reset on the First Reset Date and each subsequent Reset Date and any interest payable after the First Reset Date may be based on a rate that is less than the initial or any other previous fixed interest rate.

The interest rate on the notes from their original issue date to the First Reset Date will be % per annum. Beginning on the First Reset Date, the interest rate on the notes for each Reset Period will equal the Five-year U.S. Treasury Rate as of the most recent Reset Interest Determination Date plus a spread of %, to be reset on each Reset Date. Therefore, the interest rate during any Interest Payment Period beginning on the First Reset Date or any subsequent Reset Date could be less than the fixed interest rate for the initial period from and including the original issue date of the notes to but excluding the First Reset Date or any previous Reset Period. We have no control over the factors that may affect U.S. Treasury rates, including geopolitical, economic, financial, political, regulatory, judicial or other conditions or events.

The historical Five-year U.S. Treasury Rates are not an indication of future Five-year U.S. Treasury Rates.

As noted above, the annual interest rate on the notes for each Reset Period will be set by reference to the Five-year U.S. Treasury Rate as of the most recent Reset Interest Determination Date. In the past, U.S. Treasury rates have experienced significant fluctuations. You should note that historical levels, fluctuations and trends of U.S. Treasury rates are not necessarily indicative of future levels. Any historical upward or downward trend in U.S. Treasury rates is not an indication that U.S. Treasury rates are more or less likely to increase or decrease at any time in the future and you should not take historical U.S. Treasury rates as an indication of future U.S. Treasury Rates.

We can defer interest payments on the notes for one or more Optional Deferral Periods of up to 20 consecutive semi-annual Interest Payment Periods each. This may affect the market price of the notes.

So long as no event of default (as defined below under “Description of the Notes — Events of Default”) with respect to the notes has occurred and is continuing, we may, at our option, defer interest payments on the notes, from time to time, for one or more Optional Deferral Periods of up to 20 consecutive semi-annual Interest Payment Periods each, except that no such Optional Deferral Period may extend beyond the final maturity date of the notes or end on a day other than the day immediately preceding an interest payment date. In other words, we may declare at our discretion up to a ten-year interest payment moratorium on the notes and may choose to do that on one or more occasions. Moreover, following the end of any Optional Deferral Period, if all amounts then due on the notes are paid, we could immediately start a new Optional Deferral Period of up to 20 consecutive semi-annual Interest Payment Periods. No interest will be paid or payable on the notes during any Optional Deferral Period unless we elect, at our option, to redeem notes during such Optional Deferral Period, in which case accrued and unpaid interest to, but excluding, the redemption date will be due and payable on such redemption date only on the notes being redeemed, or unless the principal of and interest on the notes shall have been declared due and payable as a result of an event of default with respect to the notes, in which case all accrued and unpaid interest on the notes shall become due and payable. Instead, interest on the notes would be deferred but would continue to accrue at the then-applicable interest rate on the notes (as reset from time to time on any Reset Date occurring during such Optional Deferral Period in accordance with the terms of the notes). In addition, during any Optional Deferral Period interest on the deferred interest would accrue at the then-applicable interest rate on the notes (as reset from time to time on any Reset Date occurring during such Optional Deferral Period in accordance with the terms of the notes), compounded semi-annually, to the extent permitted by applicable law. If we exercise this interest deferral right, the notes may trade at a price that does not reflect the value of accrued

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and unpaid interest on the notes or that is otherwise substantially less than the price at which the notes would have traded if we had not exercised such deferral right. If we exercise this interest deferral right and you sell your notes during an Optional Deferral Period, you may not receive the same return on your investment as a holder that continues to hold its notes until we pay the deferred interest following the end of such Optional Deferral Period. In addition, as a result of our right to defer interest payments, the market price of the notes may be more volatile than other securities that do not have these rights.

Holders of the notes subject to U.S. federal income taxation may have to pay taxes on interest before they receive payments from us.

If we exercise our option to defer interest payments on the notes, a holder of the notes subject to U.S. federal income tax on a net income basis will be required to accrue interest income for U.S. federal income tax purposes in respect of such holder’s proportionate share of the accrued but unpaid interest on the notes, even if such holder normally reports income when received. As a result, a holder will be required to include the accrued interest in such holder’s gross income for U.S. federal income tax purposes even though such holder will not have received any cash. A holder’s adjusted tax basis in a note generally will be increased by such amounts that such holder was required to include in gross income. In addition, unpaid interest accrued on the notes during an Optional Deferral Period will be payable on the interest payment date immediately following the last day of such Optional Deferral Period. If a holder sells its notes on or before the record date for such interest payment date, then all of the interest accrued on such notes during the Optional Deferral Period will be paid to the person who is the registered owner of those notes at the close of business on such record date, and the holder who sold those notes will not receive from us any of the interest that accrued on those notes during the Optional Deferral Period and that such holder reported as income for tax purposes. Holders should consult with their tax advisors regarding the tax consequences of an investment in the notes. For more information regarding the U.S. tax consequences of purchasing, owning and disposing of the notes, see “Material U.S. Federal Income Tax Considerations.”

Holders of the notes will have limited rights of acceleration.

Holders of the notes and the trustee under the Indenture may accelerate payment of the principal and interest on the notes only upon the occurrence and continuation of certain events of default. Payment of principal and interest on the notes may be accelerated upon the occurrence of an event of default under the Indenture related to failure to pay interest within 30 days after it is due, failure to pay principal or premium, if any, on the notes when due, and certain events of bankruptcy, insolvency, receivership or reorganization relating to Exelon (but not its subsidiaries). Holders of the notes and the trustee will not have the right to accelerate payment of the principal or interest on the notes upon the breach of any other covenant in the Indenture. See “Description of the Notes — Option to Defer Interest Payments,” “Description of the Notes — Events of Default” and “Description of the Notes — Limitation on Remedies.”

Rating agencies may change their practices for rating the notes, which change may affect the market price of the notes. In addition, we may redeem the notes if a rating agency makes certain changes in the equity credit methodology for securities such as the notes.

The rating agencies that currently or may in the future publish a rating for Exelon, including Moody’s Investors Service, Inc. and S&P Global Ratings, each of which is expected to initially publish a rating of the notes, may, from time to time in the future, change the way they analyze securities with features similar to the notes. This may include, for example, changes to the relationship between ratings assigned to an issuer’s senior securities and ratings assigned to subordinated securities with features similar to the notes. If any rating agencies change their practices for rating these types of securities in the future, and the ratings of the notes are subsequently lowered, the trading price of the notes could be negatively affected. In addition, we may redeem the notes, at our option, in whole but not in part, if a rating agency makes certain changes in the equity credit methodology for securities such as the notes. See “Description of the Notes — Redemption — Redemption Following a Rating Agency Event.”

An active trading market for the notes does not exist and may not develop, and any such market may be illiquid.

The notes are a new issue of securities with no established trading market, and we do not intend to apply for the listing or trading of the notes on any securities exchange or trading facility or for inclusion of

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the notes in any automated quotation system. We have been informed by the underwriters that they intend to make a market in the notes after the offering is completed. However, the underwriters may cease their market-making at any time. In addition, the liquidity of any trading market in the notes that may develop, and the market prices quoted therefor, may be adversely affected by, among other things, changes in the overall market for this type of security and changes in our financial performance or prospects or the prospects for companies in our industry generally. As a result, an active after-market for the notes may not develop or be sustained and holders of the notes may not be able to sell their notes at favorable prices or at all. The difference between bid and ask prices in any secondary market for the notes could be substantial. Accordingly, no assurance can be given as to the liquidity of, or trading market for, the notes, and holders of the notes may be required to bear the financial risks of an investment in the notes for a significant period of time.

The notes are subject to early redemption.

As described under “Description of the Notes — Redemption,” we may at our option redeem the notes in whole or in part at the times and the applicable redemption price described thereunder. Consequently, we may choose to redeem your notes at a time when prevailing interest rates are lower than the effective interest rate paid on your notes and at times when the trading price of your notes is above the redemption price. You may not be able to reinvest the redemption proceeds in an investment with a return that is as high as the return you would have earned on the notes if they had not been redeemed and with a similar level of investment risk.

Investors should not expect us to redeem the notes on the first or any other date on which they are redeemable.

We may redeem some or all of the notes, at our option, in whole or in part, (i) on any day in the period commencing on the date falling 90 days prior to the First Reset Date and ending on and including the First Reset Date and (ii) after the First Reset Date, on any interest payment date, at a redemption price in cash equal to 100% of the principal amount of the notes being redeemed, plus, subject to the terms described in the first paragraph under “Description of the Notes — Redemption — Redemption Procedures” in this prospectus supplement, accrued and unpaid interest on the notes to be redeemed to, but excluding, the redemption date. In addition, the notes may be redeemed by us at our option, in whole but not in part, following the occurrence and during the continuance of either a Tax Event or a Rating Agency Event (as those terms are defined under “Description of the Notes — Redemption” in this prospectus supplement). Any decision we may make at any time to redeem the notes before their final maturity date will depend upon, among other things, the strength of our balance sheet, our results of operations, our access to the capital markets, interest rates, our growth strategy, and general market conditions at such time. Accordingly, while we may decide to do so, investors should not expect us to redeem the notes on the first or any other date on which they are redeemable.

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USE OF PROCEEDS

We estimate that the net proceeds from the sale of the notes in this offering will be approximately $ , after deducting the underwriting discount but before deducting other offering expenses. A portion of the net proceeds from the sale of the notes, together with available cash balances, will be used to repay $464 million of currently outstanding commercial paper borrowings issued by Exelon having an approximate weighted average interest rate of 4.537% per annum as of February 11, 2025. The remainder of the net proceeds will be used for general corporate purposes. To the extent we do not use the net proceeds immediately, we may temporarily invest them in short-term, interest-bearing obligations.

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CAPITALIZATION

The following table shows our consolidated capitalization as of December 31, 2024 and as adjusted to reflect the issuance of the notes offered by this prospectus supplement and the application of the net proceeds thereof. See “Use of Proceeds.” This table is qualified in its entirety by, and should be considered in conjunction with, the more detailed information incorporated by reference or provided in this prospectus supplement or in the accompanying prospectus.

	As of December 31, 2024
	Actual			As Adjusted
	($ in millions) (unaudited)
Short-term borrowings(a)		$	1,859		$
Long-term debt(b):			44,790
Notes offered hereby
Total shareholders’ equity			26,921
Total capitalization		$	73,570		$

(a)

As described under “Use of Proceeds” above, we had approximately $464 million of outstanding commercial paper issued by Exelon as of February 11, 2025, a portion of which will be retired using a portion of the proceeds from the notes.

(b)

Includes long-term debt to financing trusts and approximately $1.45 billion of long-term debt due within one year.

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DESCRIPTION OF THE NOTES

The notes will be a series of our junior subordinated debt securities issued under the Indenture. In this section, references to “Exelon,” “we,” “us” and “our” mean Exelon excluding its consolidated entities, unless otherwise expressly stated or the context otherwise requires.

The summary of selected provisions of the notes and the Indenture appearing below supplements, and to the extent inconsistent, supersedes and replaces, the description of the general terms and provisions of the debt securities in the accompanying prospectus. This summary is not complete and is qualified by reference to the provisions of the notes and the Indenture. Forms of the notes and the Indenture have been or will be filed with the SEC and you may obtain copies as described under “Where You Can Find More Information” in the accompanying prospectus.

General

The notes will constitute a separate series of our subordinated debt securities under the Indenture and will initially be issued in the aggregate principal amount of $ . We may, from time to time, without notice to or consent of the holders of the notes, issue additional notes and any such additional notes shall form a single series under the Indenture with the notes offered by this prospectus supplement. Any such additional notes shall have the same form and terms as the notes offered by this prospectus supplement (other than the offering price, the date of issuance and, under certain circumstances, the date from which interest thereon shall begin to accrue and the first interest payment date, and except that the provisions of the notes specifying the rate of interest thereon to but excluding the First Reset Date (as defined below) shall not be applicable to any such additional notes whose date of original issuance is on or after the First Reset Date).

Interest Rate and Maturity

The notes will mature on March 15, 20 (the “final maturity date”). The notes will be subject to redemption at our option as described below under “— Redemption”.

The notes will bear interest (i) from and including the original issue date to, but excluding, , 20 (the “First Reset Date”) at the rate of % per annum and (ii) from and including the First Reset Date, during each Reset Period (as defined below) at a rate per annum equal to the Five-year U.S. Treasury Rate (as defined below) as of the most recent Reset Interest Determination Date (as defined below) plus a spread of %, to be reset on each Reset Date (as defined below). Interest on the notes will accrue from and including the original issue date and will be payable semi-annually in arrears on March 15 and September 15 (each, an “interest payment date”) of each year, beginning on September 15, 2025, to the holders of record at the close of business on the immediately preceding March 1 and September 1, respectively (each, a “record date”), subject to our right to defer interest payments as described below under “— Option to Defer Interest Payments.” Interest on the notes will be computed on the basis of a 360-day year of twelve 30-day months.

The applicable interest rate for each Reset Period will be determined by the calculation agent (as defined below), as of the applicable Reset Interest Determination Date, in accordance with the following provisions:

“Five-year U.S. Treasury Rate” means, as of any Reset Interest Determination Date, (i) an interest rate (expressed as a decimal) determined to be the per annum rate equal to the arithmetic mean of the yields to maturity for U.S. Treasury securities adjusted to constant maturity with a maturity of five years from the next Reset Date and trading in the public securities markets, for the five consecutive business days immediately prior to the respective Reset Interest Determination Date as published in the most recent H.15, or (ii) if there is no such published U.S. Treasury security with a maturity of five years from the next Reset Date and trading in the public securities markets, then the rate will be determined by interpolation between the arithmetic mean of the yields to maturity for each of the two series of U.S. Treasury securities adjusted to constant maturity trading in the public securities markets, (A) one maturing as close as possible to, but earlier than, the Reset Date following the next succeeding Reset Interest Determination Date, and (B) the other maturing as close as possible to, but later than, the Reset Date following the next succeeding Reset Interest Determination Date, in each case for the five consecutive business days immediately prior to the respective

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Reset Interest Determination Date as published in the most recent H.15. If the Five-year U.S. Treasury Rate cannot be determined pursuant to the methods described in clause (i) or (ii) above, then the Five-year U.S. Treasury Rate will be the same interest rate determined for the prior Reset Interest Determination Date or, if the Five-year U.S. Treasury Rate cannot be so determined as of the Reset Interest Determination Date preceding the First Reset Date, then the interest rate applicable for the Reset Period beginning on and including the First Reset Date will be deemed to be % per annum, which is the same interest rate as in effect from and including the original issue date to, but excluding, the First Reset Date.

“H.15” means the statistical release designated as such, or any successor publication, published by the Board of Governors of the U.S. Federal Reserve System (or any successor thereto).

The “most recent H.15” means the H.15 published closest in time but prior to the close of business on the second business day prior to the applicable Reset Date.

“Reset Date” means the First Reset Date and March 15 of every fifth year after 203 .

“Reset Interest Determination Date” means, in respect of any Reset Period, the day falling two business days prior to the first day of such Reset Period.

“Reset Period” means the period from and including the First Reset Date to, but excluding, the next following Reset Date and thereafter each period from and including a Reset Date to, but excluding, the next following Reset Date.

As used under this caption “Description of the Notes,” the term “business day” means, unless otherwise expressly stated, any day other than (i) a Saturday or Sunday or (ii) a day on which banking institutions in The City of New York are authorized or obligated by law or executive order to remain closed.

The term “calculation agent” means, at any time, the entity appointed by us and serving as such agent with respect to the notes at such time. Unless we have validly called all of the outstanding notes for redemption on a redemption date occurring prior to the First Reset Date, we will appoint a calculation agent for the notes prior to the Reset Interest Determination Date immediately preceding the First Reset Date; provided that, if we have called all of the outstanding notes for redemption on a redemption date occurring prior to the First Reset Date but we do not redeem all of the outstanding notes on such redemption date, we will appoint a calculation agent for the notes as promptly as practicable after such proposed redemption date. We may terminate any such appointment and may appoint a successor calculation agent at any time and from time to time (so long as there shall always be a calculation agent in respect of the notes when so required). We may appoint Exelon or an affiliate of Exelon as calculation agent.

As provided above, the applicable interest rate for each Reset Period will be determined by the calculation agent as of the applicable Reset Interest Determination Date. Promptly upon such determination, the calculation agent will notify us of the interest rate for the Reset Period and we will promptly notify, or cause the calculation agent to promptly notify, the trustee and each paying agent of such interest rate. The calculation agent’s determination of any interest rate, and its calculation of the amount of interest for any Interest Payment Period (as defined below under “— Option to Defer Interest Payments”) beginning on or after the First Reset Date, will be on file at our principal offices, will be made available to any holder or beneficial owner of the notes upon request and will be final and binding in the absence of manifest error.

If any interest payment date, redemption date or the maturity date of the notes is not a business day (as defined in the Indenture) at any place of payment, then payment of the principal, premium, if any, and interest may be made on the next business day (as defined in the Indenture) at that place of payment. In that case, no interest will accrue on the amount payable for the period from and after the applicable interest payment date, redemption date or maturity date, as the case may be.

No Listing

The notes are a new issue of securities with no established trading market. We do not intend to apply for the listing or trading of the notes on any securities exchange or trading facility or for inclusion of the notes in any automated quotation system.

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Ranking

The notes will be our unsecured obligations and will rank junior and subordinated in right of payment to the prior payment in full of our existing and future Senior Indebtedness (as defined below under “— Subordination”), to the extent and in the manner set forth under the caption “— Subordination” below. In addition, the notes will be effectively subordinated in right of payment to any secured indebtedness we may have or may incur (to the extent of the value of the collateral securing such secured indebtedness).

Because we are a holding company with no material assets other than our ownership interests in our subsidiaries and all of our operations are conducted by our subsidiaries, our debt is effectively subordinated to all existing and future debt, trade creditors, and other liabilities of our subsidiaries. Our rights, and hence the rights of our creditors, to participate in any distribution of assets of any subsidiary upon its liquidation or reorganization or otherwise would be subject to the prior claims of that subsidiary’s creditors, except to the extent that our claims as a creditor of such subsidiary may be recognized. As of December 31, 2024, our subsidiaries had outstanding approximately $32.6 billion of long-term debt, including long-term debt to financing trusts and the portion of long-term debt due within one year. The indenture does not restrict our or our subsidiaries’ ability to incur additional indebtedness. In addition, the notes will not be obligations of or guaranteed by any of our subsidiaries. The indenture does not limit our ability to issue secured debt senior to the notes or the amount of debt we or our subsidiaries may issue, whether secured or unsecured.

Please see “Capitalization” in this prospectus supplement for information with respect to the long-term debt and short-term borrowings of us and our subsidiaries as of December 31, 2024.

Form and Denomination

The notes will be issued in registered form in minimum denominations of $2,000 and integral multiples of $1,000 in excess thereof.

The notes will initially be issued in “book-entry only form,” represented by a permanent global debt security registered in the name of DTC, including Clearstream and/or Euroclear, or its nominee. However, we reserve the right to issue notes in certificated form registered in the name of the noteholders. For so long as the notes are registered in the name of DTC or its nominee, we will pay the principal, premium, if any, and interest due on the notes to DTC for payment to its participants for subsequent disbursement to the beneficial owners. For further information on DTC and its practices, see “Book-Entry System” below.

Redemption

Optional Redemption

We may redeem some or all of the notes, at our option, in whole or in part (i) on any day in the period commencing on the date falling 90 days prior to the First Reset Date and ending on and including the First Reset Date and (ii) after the First Reset Date, on any interest payment date, at a redemption price in cash equal to 100% of the principal amount of the notes being redeemed, plus, subject to the terms described in the first paragraph under “— Redemption Procedures” below, accrued and unpaid interest on the notes to be redeemed to, but excluding, the redemption date.

Redemption Following a Tax Event

We may at our option redeem the notes, in whole but not in part, at any time following the occurrence and during the continuance of a Tax Event (as defined below) at a redemption price in cash equal to 100% of the principal amount of the notes, plus, subject to the terms described in the first paragraph under “— Redemption Procedures” below, accrued and unpaid interest on the notes to, but excluding, the redemption date.

A “Tax Event” means that we have received an opinion of counsel experienced in such matters to the effect that, as a result of:

•

any amendment to, clarification of, or change, including any announced prospective change, in the laws or treaties of the United States or any of its political subdivisions or taxing authorities, or any regulations under those laws or treaties;

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•

an administrative action, which means any judicial decision or any official administrative pronouncement, ruling, regulatory procedure, notice or announcement, including any notice or announcement of intent to issue or adopt any administrative pronouncement, ruling, regulatory procedure or regulation;

•

any amendment to, clarification of, or change in the official position or the interpretation of any administrative action or judicial decision or any interpretation or pronouncement that provides for a position with respect to an administrative action or judicial decision that differs from the previously generally accepted position, in each case by any legislative body, court, governmental authority or regulatory body, regardless of the time or manner in which that amendment, clarification or change is introduced or made known; or

•

a threatened challenge asserted in writing in connection with a tax audit of us or any of our subsidiaries, or a publicly-known threatened challenge asserted in writing against any other taxpayer that has raised capital through the issuance of securities that are substantially similar to the notes,

which amendment, clarification or change is effective or the administrative action is taken or judicial decision, interpretation or pronouncement is issued or threatened challenge is asserted or becomes publicly-known after the date of this prospectus supplement, there is more than an insubstantial risk that interest payable by us on the notes is not deductible, or within 90 days would not be deductible, in whole or in part, by us for U.S. federal income tax purposes.

Redemption Following a Rating Agency Event

We may at our option redeem the notes, in whole but not in part, at any time following the occurrence and during the continuance of a Rating Agency Event (as defined below) at a redemption price in cash equal to 102% of the principal amount of the notes, plus, subject to the terms described in the first paragraph under “— Redemption Procedures” below, accrued and unpaid interest on the notes to, but excluding, the redemption date.

“Rating Agency Event” means, as of any date, a change, clarification or amendment in the methodology published by any nationally recognized statistical rating organization within the meaning of Section 3(a)(62) of the Securities Exchange Act of 1934, as amended (or any successor provision thereto), that then publishes a rating for Exelon (together with any successor thereto, a “rating agency”) in assigning equity credit to securities such as the notes, (a) as such methodology was in effect on the date of this prospectus supplement, in the case of any rating agency that published a rating for Exelon as of the date of this prospectus supplement, or (b) as such methodology was in effect on the date such rating agency first published a rating for Exelon, in the case of any rating agency that first publishes a rating for Exelon after the date of this prospectus supplement (in the case of either clause (a) or (b), the “current methodology”), that results in (i) any shortening of the length of time for which a particular level of equity credit pertaining to the notes by such rating agency would have been in effect had the current methodology not been changed or (ii) a lower equity credit (including up to a lesser amount) being assigned by such rating agency to the notes as of the date of such change, clarification or amendment than the equity credit that would have been assigned to the notes by such rating agency had the current methodology not been changed.

Redemption Procedures

Notwithstanding any statement under this caption “— Redemption” to the contrary, installments of interest on the notes that are due and payable on any interest payment date falling on or prior to a redemption date for the notes will be payable on that interest payment date to the registered holders thereof as of the close of business on the relevant record date according to the terms of the notes and the Indenture, except that, if the redemption date for any notes falls on any day during an Optional Deferral Period (as defined below under “— Option to Defer Interest Payments”), accrued and unpaid interest (including, to the extent permitted by applicable law, any compound interest (as defined below under “— Option to Defer Interest Payments”)) on such notes will be paid on such redemption date to the persons entitled to receive the redemption price of such notes. For the avoidance of doubt, the interest payment date falling immediately after the last day of an Optional Deferral Period shall not be deemed to fall on a day during such Optional Deferral Period.

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Notice of redemption will be mailed at least 30 days but not more than 60 days before the redemption date to each registered holder of the notes to be redeemed. Once notice of redemption is mailed, the notes called for redemption will become due and payable on the redemption date at the applicable redemption price, plus, subject to the terms described in the immediately preceding paragraph, accrued and unpaid interest to, but excluding, the redemption date, and will be paid upon surrender thereof for redemption. If only part of a note is redeemed, the trustee will issue in the name of the registered holder of the note and deliver to such holder a new note in a principal amount equal to the unredeemed portion of the principal of the note surrendered for redemption. If we elect to redeem all or a portion of the notes, then the redemption will not be conditional upon receipt by the paying agent or the trustee of monies sufficient to pay the redemption price.

Unless we default in payment of the redemption price, on and after the redemption date interest will cease to accrue on the notes or portions thereof called for redemption.

If less than all of the notes are to be redeemed on any redemption date, the particular notes (or portions thereof) to be redeemed shall be selected by such method as the trustee shall deem fair and appropriate or, in the case of notes in book-entry form represented by one or more global notes, by such method of selection as may be required or permitted by the Depositary.

Option to Defer Interest Payments

So long as no event of default (as defined below under “— Events of Default”) with respect to the notes has occurred and is continuing, we may, at our option, defer interest payments on the notes, from time to time, for one or more deferral periods of up to 20 consecutive Interest Payment Periods (as defined below) each (each such deferral period, commencing on the interest payment date on which the first such deferred interest payment otherwise would have been made, an “Optional Deferral Period”), except that no such Optional Deferral Period may extend beyond the final maturity date of the notes or end on a day other than the day immediately preceding an interest payment date. During any Optional Deferral Period, interest on the notes will continue to accrue at the then-applicable interest rate on the notes (as reset from time to time on any Reset Date occurring during such Optional Deferral Period in accordance with the terms of the notes). In addition, during any Optional Deferral Period interest on the deferred interest (“compound interest”) will accrue at the then-applicable interest rate on the notes (as reset from time to time on any Reset Date occurring during such Optional Deferral Period in accordance with the terms of the notes), compounded semi-annually, to the extent permitted by applicable law. No interest will be due or payable on the notes during an Optional Deferral Period, except upon a redemption of any notes on any redemption date during such Optional Deferral Period (in which case all accrued and unpaid interest (including, to the extent permitted by applicable law, any compound interest) on the notes to be redeemed to, but excluding, such redemption date will be due and payable on such redemption date), or unless the principal of and interest on the notes shall have been declared due and payable as the result of an event of default with respect to the notes (in which case all accrued and unpaid interest, including, to the extent permitted by applicable law, any compound interest, on the notes shall become due and payable). All references in the notes and, insofar as relates to the notes, the Indenture, to “interest” on the notes shall be deemed to include any such deferred interest and, to the extent permitted by applicable law, any compound interest, unless otherwise expressly stated or the context otherwise requires.

Before the end of any Optional Deferral Period that is shorter than 20 consecutive Interest Payment Periods, we may elect, at our option, to extend such Optional Deferral Period, so long as the entire Optional Deferral Period does not exceed 20 consecutive Interest Payment Periods or extend beyond the final maturity date of the notes. We may also elect, at our option, to shorten the length of any Optional Deferral Period. No Optional Deferral Period (including as extended or shortened) may end on a day other than the day immediately preceding an interest payment date. At the end of any Optional Deferral Period, if all amounts then due on the notes, including all accrued and unpaid interest thereon (including, without limitation and to the extent permitted by applicable law, any compound interest), are paid, we may elect to begin a new Optional Deferral Period; provided, however, that, without limitation of the foregoing, we may not begin a new Optional Deferral Period unless we have paid all accrued and unpaid interest on the notes (including, without limitation and to the extent permitted by applicable law, any compound interest) from any previous Optional Deferral Periods.

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During any Optional Deferral Period, we will not do any of the following (subject to the exceptions set forth in the next succeeding paragraph):

•

declare or pay any dividends or distributions on any Capital Stock (as defined below) of Exelon;

•

redeem, purchase, acquire or make a liquidation payment with respect to any Capital Stock of Exelon;

•

pay any principal, interest or premium on, or repay, repurchase or redeem, any indebtedness of Exelon that ranks equally with or junior to the notes in right of payment; or

•

make any payments with respect to any guarantees by Exelon of any indebtedness if such guarantees rank equally with or junior to the notes in right of payment.

However, during an Optional Deferral Period, we may (a) declare and pay dividends or distributions payable solely in shares of our common stock (together, for the avoidance of doubt, with cash in lieu of any fractional share) or options, warrants or rights to subscribe for or purchase shares of our common stock, (b) declare and pay any dividend in connection with the implementation of a plan (a “Rights Plan”) providing for the issuance by us to all holders of our common stock of rights entitling them to subscribe for or purchase common stock or any class or series of our preferred stock, which rights (1) are deemed to be transferred with such common stock, (2) are not exercisable until the occurrence of a specified event or events and (3) are also issued in respect of future issuances of our common stock, (c) issue any shares of our Capital Stock under any Rights Plan or redeem or repurchase any rights distributed pursuant to a Rights Plan, (d) reclassify our Capital Stock or exchange or convert one class or series of our Capital Stock for another class or series of our Capital Stock, (e) purchase fractional interests in shares of our Capital Stock pursuant to the conversion or exchange provisions of such Capital Stock or the security being converted or exchanged, (f) purchase, acquire or withhold shares of our common stock related to the issuance of our common stock or rights under any dividend reinvestment plan or related to any of our benefit plans for our directors, officers, employees, consultants or advisors, including any employment contract, and (g) for the avoidance of doubt, convert convertible Capital Stock of Exelon into other Capital Stock of Exelon in accordance with the terms of such convertible Capital Stock (together, for the avoidance of doubt, with cash in lieu of any fractional share).

We will give the holders of the notes and the trustee notice of our election of, or any shortening or extension of, an Optional Deferral Period at least 10 business days prior to the earlier of (1) the next succeeding interest payment date or (2) the date upon which we are required to give notice to any applicable self-regulatory organization or to holders of the notes of the next succeeding interest payment date or the record date therefor. The record date for the payment of deferred interest and, to the extent permitted by applicable law, any compound interest payable on the interest payment date immediately following the last day of an Optional Deferral Period will be the regular record date with respect to such interest payment date.

“Capital Stock” means (i) in the case of a corporation or a company, corporate stock or shares; (ii) in the case of an association or business entity, any and all shares, interests, participations, rights or other equivalents (however designated) of corporate stock; (iii) in the case of a partnership or limited liability company, partnership or membership interests (whether general or limited); and (iv) any other interest or participation that confers on a person the right to receive a share of the profits and losses of, or distributions of assets of, the issuing person.

“Interest Payment Period” means the semi-annual period from and including an interest payment date to but excluding the next succeeding interest payment date, except for the first Interest Payment Period which shall be the period from and including the original issue date to but excluding September 15, 2025.

Events of Default

The Events of Default and related provisions will apply to the notes including:

(a)

failure to pay interest, on any note within 30 days after the same becomes due and payable (whether or not payment is prohibited by the subordination provisions of the Indenture) provided, however, that a valid deferral of the interest payment by the Company as described above under “Option to Defer Interest Payments”; or

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(b)

failure to pay the principal of or premium, if any, on any note when it becomes due and payable (whether or not payment is prohibited by the subordination provisions of the Indenture); or

(c)

failure to perform, or breach of, any covenant or warranty of the Company in the Indenture (other than a covenant or warranty a default in the performance of which or breach of which is elsewhere in the applicable section of the Indenture specifically dealt with or which has expressly been included in the Indenture solely for the benefit of one or more series of securities other than the Notes) and the continuance of such default or breach for a period of 60 days after there has been given, by registered or certified mail, to the Company by the trustee, or to the Company and the trustee by the holders of at least 33% in principal amount of the outstanding Notes, a written notice specifying such default or breach and requiring it to be remedied and stating that such notice is a “Notice of Default” under the Indenture, unless the trustee, or the trustee and the holders of a principal amount of Notes not less than the principal amount of Notes the holders of which gave such notice, as the case may be, shall agree in writing to an extension of such period prior to its expiration; provided, however, that the trustee, or the trustee and the holders of such principal amount of notes, as the case may be, shall be deemed to have agreed to an extension of such period if corrective action is initiated by the Company within such period and is being diligently pursued in good faith; or

(d)

the entry by a court having jurisdiction in the premises of (1) a decree or order for relief in respect of the Company in an involuntary case or proceeding under any applicable Federal or State bankruptcy, insolvency, reorganization or other similar law or (2) a decree or order adjudging the Company as bankrupt or insolvent, or approving as properly filed a petition by one or more Persons other than the Company seeking reorganization, arrangement, adjustment or composition of or in respect of the Company under any applicable Federal or State law, or appointing a custodian, receiver, liquidator, assignee, trustee, sequestrator or other similar official for the Company or for any substantial part of its property, or ordering the winding up or liquidation of its affairs, and any such decree or order for relief or any such other decree or order shall have remained unstayed and in effect for a period of 90 consecutive days; or

(e)

the commencement by the Company of a voluntary case or proceeding under any applicable Federal or State bankruptcy, insolvency, reorganization or other similar law or of any other case or proceeding to be adjudicated a bankrupt or insolvent, or the consent by the Company to the entry of a decree or order for relief in respect of the Company in a case or proceeding under any applicable Federal or State bankruptcy, insolvency, reorganization or other similar law or to the commencement of any bankruptcy or insolvency case or proceeding against the Company, or the filing by the Company of a petition or answer or consent seeking reorganization or relief under any applicable Federal or State law, or the consent by the Company to the filing of such petition or to the appointment of or taking possession by a custodian, receiver, liquidator, assignee, trustee, sequestrator or similar official of the Company or of any substantial part of its property, or the making by the Company of an assignment for the benefit of creditors, or the admission by the Company in writing of its inability to pay its debts generally as they become due, or the authorization of such action by the Board of Directors of the Company.

The holders of a majority in principal amount of outstanding notes may waive a default or Event of Default, other than a default in the payment of principal of, or interest on, the notes (including the redemption price or purchase price of the notes, if applicable), or a default or Event of Default with respect to a covenant or provision that cannot be modified or amended without the consent of the holder of each outstanding note.

If any portion of the amount payable on the notes upon acceleration is considered by a court to be unearned interest, the court could disallow recovery of such portion.

However, as discussed below under “— Limitation of Remedies,” neither the trustee nor the holders of the notes will be entitled to declare the notes to be due and payable immediately upon the occurrence of an event of default described in clause (c) above.

Limitation on Remedies

If an Event of Default occurs and is continuing, then either the trustee or the registered holders of at least 33% in aggregate principal amount of the outstanding notes may declare the principal amount of all of

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the notes, and interest accrued thereon to be due and payable immediately (provided that the payment of principal and interest on such notes shall remain subordinated to the extent provided in the Indenture), by a notice in writing to the Company (and to the trustee if given by registered holders of the notes), and, upon receipt by the Company of notice of such declaration of acceleration, such principal amount (or specified amount) and interest accrued thereon shall become immediately due and payable.

At any time after such a declaration of acceleration with respect to the notes has been made and before a judgment or decree for payment of the money due shall have been obtained by the trustee, the Event of Default giving rise to such declaration of acceleration shall, without further act, be deemed to have been waived, and such declaration and its consequences shall, without further act, be deemed to have been rescinded and annulled, if:

(a)

the Company shall have paid or deposited with the trustee a sum sufficient to pay

all overdue interest, if any, on all outstanding notes;

the principal of and premium, if any, on any outstanding notes which have become due otherwise than by such declaration of acceleration and interest thereon at the rate or rates prescribed therefor in such notes;

to the extent that payment of such interest is lawful, interest upon overdue interest at the rate or rates prescribed therefor in such notes;

all amounts due to the trustee under the Indenture; and

(b)

if, after application of money paid or deposited in accordance with clause (a) above, the notes would remain outstanding, any other Event or Events of Default with respect to the notes, other than the non-payment of the principal of the notes which shall have become due solely by such declaration of acceleration, shall have been cured or waived.

Consolidation, Merger or Sale

We may not merge or consolidate with any other person or sell or convey all or substantially all of our assets to any person unless (1) either we are the continuing person, or the successor person (if other than us) is organized and existing under the laws of the United States of America or a State thereof or the District of Columbia and expressly assumes the due and punctual payment of the principal of and interest on the notes, and the due and punctual performance and observance of all of the covenants and conditions of the Indenture to be performed by us by supplemental indenture in form satisfactory to the trustee, executed and delivered to the trustee by such person, and (2) we or such successor person, as the case may be, will not, immediately after such merger or consolidation, or such sale or conveyance, be in default in the performance of any such covenant or condition.

In case of any such consolidation, merger or conveyance, such successor person will succeed to and be substituted for us, with the same effect as if it had been named as us in the Indenture, and in the event of such conveyance (other than by way of a lease), we will be discharged of all of our obligations and covenants under the Indenture and the notes.

Modification of Indenture

Without Holder Consent

Without the consent of any holders of Notes, we and the trustee may from time to time amend and/or supplement the Indenture and the notes for the following purposes:

•

to evidence the succession of another corporation to us, or successive successions, and the assumption by such successor corporation of our covenants, agreements and obligations pursuant to the provisions described under “— Consolidation, Merger or Sale”;

•

to add to our covenants such further covenants, restrictions or conditions as we and the trustee consider to be for the protection of the holders of the notes, and to make the occurrence, or the

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occurrence and continuance, of a default in any such additional covenants, restrictions or conditions a default or an Event of Default; provided that such supplemental indenture may provide for a particular grace period or an immediate enforcement upon such default or limit the remedies available to the trustee upon such default;

•

to change or eliminate any provision of the Indenture; provided, however, that any such change or elimination becomes effective only when there are no notes outstanding, or the notes are not entitled to the benefit of such provision;

•

to cure any ambiguity or to correct or supplement any provision contained in the Indenture that may be defective or inconsistent with any other provisions contained therein, or to make such other provision in regard to matters or questions arising under the Indenture; provided that such action will not adversely affect the interest of the holders of the notes in any material respect;

•

to mortgage or pledge to the trustee as security for the notes any property or assets that we may desire to mortgage or pledge as security for the notes; and

•

to qualify, or maintain the qualification of, the Indenture under the Trust Indenture Act.

With Holder Consent

Under the Indenture, supplemental indentures for the purposes of adding any provisions to or changing in any manner or eliminating any of the provisions of the Indenture or of modifying in any manner the rights of the holders of the notes under the Indenture may be entered into by us, when authorized by board resolution, and the trustee, with the consent of the holders of not less than a majority in principal amount of the notes. However, no such supplemental indenture shall:

•

change the maturity of the notes, or reduce the rate or extend the time of payment of any interest thereon or on any overdue principal amount or reduce the principal amount thereof, or change the provisions pursuant to which the rate of interest on the notes is determined if such change could reduce the rate of interest thereon, or reduce the minimum rate of interest thereon (if any), or reduce any amount payable upon any redemption thereof, or reduce the amount to be paid at maturity or make the principal thereof or any interest thereon or on any overdue principal amount payable in any coin or currency other than U.S. dollars without the consent of the holder of each Note so affected;

•

reduce the percentage of notes, the holders of which are required to consent to any such supplemental indenture, without the consent of the holders of all notes then outstanding;

•

modify any of the provisions of the Indenture relating to modifications, waivers of our compliance with covenants thereunder or direction of the trustee by holders of notes, except to increase the percentage of holders who must consent thereto or to provide that certain other provisions cannot be modified or waived without the consent of the holders of all notes then outstanding;

A supplemental indenture that changes or eliminates any covenant or other provision of the Indenture expressly included solely for the benefit of holders of securities other than the notes, or which modifies the rights of the holders of securities other than the notes with respect to such covenant or other provision, will be deemed not to affect the rights under the Indenture of the holders of the notes.

We may omit to comply with any covenant or condition contained in the Indenture if holders of a majority in principal amount of the notes waive such compliance.

Agreement by Holders to Tax Treatment

Each holder (and beneficial owner) of the notes will, by accepting any notes (or a beneficial interest therein), be deemed to have agreed that such holder (or beneficial owner) intends that the notes constitute indebtedness of Exelon, and will treat the notes as indebtedness of Exelon, for U.S. federal income and applicable state and local tax purposes.

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Subordination

The notes will be subordinate and junior in right of payment to all Senior Indebtedness as defined below.

If:

(a)

we make a payment or distribution of any of our assets to creditors upon our dissolution, winding-up, liquidation or reorganization, whether in bankruptcy, insolvency or otherwise;

(b)

a default beyond any grace period has occurred and is continuing with respect to the payment of principal, interest or any other monetary amounts due and payable on any Senior Indebtedness; or

(c)

the maturity of any Senior Indebtedness has been accelerated because of a default on that Senior Indebtedness,

then the holders of Senior Indebtedness generally will have the right to receive payment of all amounts due on that Senior Indebtedness, or we will make provision for those payments, before the holders of any notes have the right to receive any payments of principal or interest on their notes. So long as any of the events in clauses (a), (b), or (c) above has occurred and is continuing, any amounts payable or assets distributable on the notes will instead be paid or distributed, as the case may be, directly to the holders of Senior Indebtedness to the extent necessary to pay, in the case of clause (a) above, all amounts due or to become due upon all such Senior Indebtedness, or, in the case of clauses (b) and (c) above, all amounts due on all such Senior Indebtedness, and, if any such payment or distribution is received by the trustee under the Indenture or the holders of any of the notes before all Senior Indebtedness due and to become due or due, as applicable, is paid, such payment or distribution must be paid over to the holders of the unpaid Senior Indebtedness. Subject to paying the Senior Indebtedness due and to become due in the case of clause (a) or the Senior Indebtedness due in the case of clauses (b) and (c), the holders of the notes will be subrogated to the rights of the holders of the Senior Indebtedness to receive payments applicable to the Senior Indebtedness until the notes are paid in full.

“Senior Indebtedness” means all of our obligations, as the case may be, whether presently existing or from time to time hereafter incurred, created, assumed or existing, to pay principal, premium, interest, penalties, fees and any other payment in respect of any of the following:

•

obligations for borrowed money, including without limitation such obligations as are evidenced by credit agreements, notes, debentures, bonds or other securities or instruments;

•

capitalized lease obligations;

•

all obligations of the types referred to in clauses (a) and (b) above of others which we have assumed, endorsed, guaranteed, contingently agreed to purchase or provide funds for the payment of, or otherwise becomes liable for, under any agreement; or

•

all renewals, extensions or refundings of obligations of the kinds described in any of the preceding categories;

unless, in the case of any particular obligation, indebtedness, renewal, extension or refunding, the instrument creating or evidencing the same or the assumption or guarantee of the same expressly provides that such obligation, indebtedness, renewal, extension or refunding is not superior in right of payment to or is pari passu with the Securities; and provided further that trade accounts payable and accrued liabilities arising in the ordinary course of business shall not be deemed to be Senior Indebtedness.

Senior Indebtedness will be entitled to the benefits of the subordination provisions in the Indenture irrespective of the amendment, modification or waiver of any term of the Senior Indebtedness. We may not amend the Indenture to change the subordination provisions without the consent of each holder of Senior Indebtedness that the amendment would adversely affect.

Holders of the notes should recognize that contractual provisions in the Indenture may prohibit us from making payments on the notes. The notes are subordinate and junior in right of payment, to the extent and in the manner stated in the Indenture, to all of our Senior Indebtedness, as defined above.

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The indenture does not restrict or limit in any way our ability to incur Senior Indebtedness. As of December 31, 2024, Exelon had approximately $12.1 billion principal amount of outstanding long-term debt on an unconsolidated basis that will be senior to the notes. Additionally, as of December 31, 2024, our subsidiaries had approximately $32.6 billion of outstanding long-term debt (including securities due within one year).

Governing Law

The indenture and the notes will be governed by the laws of the State of New York.

Concerning the Trustee

The trustee under the subordinated indenture is The Bank of New York Mellon Trust Company, N.A. We and certain of our affiliates maintain deposit accounts and banking relationships with The Bank of New York Mellon Trust Company, N.A. or its affiliates. The Bank of New York Mellon Trust Company, N.A. also serves as trustee under other indentures under which securities of certain of our affiliates are outstanding. The Bank of New York Mellon Trust Company, N.A. and its affiliates have purchased, and are likely to purchase in the future, our securities and securities of our affiliates.

Book-Entry System

We will issue the notes in the form of one or more global notes in fully registered form initially in the name of Cede & Co., as nominee of DTC, or such other name as may be requested by an authorized representative of DTC. The global notes will be deposited with DTC and may not be transferred except as a whole by DTC to a nominee of DTC or by a nominee of DTC to DTC or another nominee of DTC or by DTC or any nominee to a successor of DTC or a nominee of such successor.

DTC, the world’s largest securities depository, is a limited-purpose trust company organized under the New York Banking Law, a “banking organization” within the meaning of the New York Banking Law, a member of the Federal Reserve System, a “clearing corporation” within the meaning of the New York Uniform Commercial Code, and a “clearing agency” registered pursuant to the provisions of Section 17A of the Exchange Act. DTC holds and provides asset servicing for U.S. and non-U.S. equity, corporate and municipal debt issues, and money market instruments that DTC’s participants (direct participants) deposit with DTC. DTC also facilitates the post-trade settlement among direct participants of sales and other securities transactions in deposited securities through electronic computerized book-entry transfers and pledges between direct participants’ accounts. This eliminates the need for physical movement of securities certificates. Direct participants include both U.S. and non-U.S. securities brokers and dealers, banks, trust companies, clearing corporations, and certain other organizations. DTC is a wholly-owned subsidiary of The Depository Trust & Clearing Corporation (DTCC). DTCC is the holding company for DTC, National Securities Clearing Corporation and Fixed Income Clearing Corporation, all of which are registered clearing agencies. DTCC is owned by the users of its regulated subsidiaries. Access to the DTC system is also available to others such as both U.S. and non-U.S. securities brokers and dealers, banks, trust companies, and clearing corporations that clear through or maintain a custodial relationship with a direct participant, either directly or indirectly (indirect participants). The rules applicable to DTC and its direct and indirect participants are on file with the SEC. More information about DTC can be found at www.dtcc.com. We do not intend this internet address to be an active link or to otherwise incorporate the content of the website into this prospectus supplement.

Clearstream advises that it is incorporated under the laws of Luxembourg as a bank. Clearstream holds securities for its customers and facilitates the clearance and settlement of securities transactions between its customers through electronic book-entry transfers between their accounts. Clearstream provides to its customers among other things, services for safekeeping, administration, clearance and settlement of internationally traded securities and securities lending and borrowing. Clearstream interfaces with domestic securities markets in over 30 countries through established depository and custodial relationships. As a bank, Clearstream is subject to regulation by the Luxembourg Commission for the Supervision of the Financial Sector, also known as the Commission de Surveillance du Secteur Financier. Its customers are recognized financial institutions around the world, including underwriters, securities brokers and dealers, banks, trust companies, clearing corporations and certain other organizations. Its customers in the United

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States are limited to securities brokers and dealers and banks. Indirect access to Clearstream is also available to other institutions such as banks, brokers, dealers and trust companies that clear through or maintain a custodial relationship with the customer.

Euroclear advises that it was created in 1968 to hold securities for its participants and to clear and settle transactions between Euroclear participants through simultaneous electronic book-entry delivery against payment, thereby eliminating the need for physical movement of certificates and any risk from lack of simultaneous transfers of securities and cash. Euroclear provides various other services, including securities lending and borrowing and interfaces with domestic markets in several countries. Euroclear is operated by Euroclear Bank S.A./N.V.. Euroclear Clearance establishes policy for Euroclear on behalf of Euroclear participants. Euroclear participants include banks, including central banks, securities brokers and dealers and other professional financial intermediaries and may include the Initial purchasers. Indirect access to Euroclear is also available to other firms that clear through or maintain a custodial relationship with a Euroclear participant, either directly or indirectly. Securities clearance accounts and cash accounts with the Euroclear operator are governed by the terms and conditions governing use of Euroclear and the related operating procedures of Euroclear. These terms and conditions govern transfers of securities and cash within Euroclear, withdrawals of securities and cash from Euroclear, and receipts of payments with respect to securities in Euroclear. All securities in Euroclear are held on a fungible basis without attribution of specific certificates to specific securities clearance accounts. The Euroclear operator acts under the terms and conditions only on behalf of Euroclear participants and has no record of or relationship with persons holding through Euroclear participants.

Euroclear further advises that investors that acquire, hold and transfer interests in the notes by book-entry through accounts with the Euroclear operator or any other securities intermediary are subject to the laws and contractual provisions governing their relationship with their intermediary, as well as the laws and contractual provisions governing the relationship between such an intermediary and each other intermediary, if any, standing between themselves and the global securities.

Purchases of notes under the DTC system must be made by or through direct participants, which will receive a credit for the notes in DTC’s records. The ownership interest of each actual purchaser of notes (beneficial owner) is in turn to be recorded on the direct and indirect participants’ records. Beneficial owners of the notes will not receive written confirmation from DTC of their purchase, but beneficial owners are expected to receive written confirmations providing details of the transaction, as well as periodic statements of their holdings, from the direct or indirect participant through which the beneficial owner entered into the transaction. Transfers of ownership interests in the notes are to be accomplished by entries made on the books of direct and indirect participants acting on behalf of beneficial owners. Beneficial owners will not receive certificates representing their ownership interests in the notes, except in the event that use of the book-entry system for the notes is discontinued.

To facilitate subsequent transfers, all notes deposited by direct participants with DTC are registered in the name of DTC’s partnership nominee, Cede & Co., or such other name as may be requested by an authorized representative of DTC. The deposit of notes with DTC and their registration in the name of Cede & Co. or such other nominee do not effect any change in beneficial ownership. DTC has no knowledge of the actual beneficial owners of the notes; DTC’s records reflect only the identity of the direct participants to whose accounts such notes are credited, which may or may not be the beneficial owners. The direct and indirect participants will remain responsible for keeping account of their holdings on behalf of their customers.

Conveyance of notices and other communications by DTC to direct participants, by direct participants to indirect participants, and by direct participants and indirect participants to beneficial owners will be governed by arrangements among them, subject to any statutory or regulatory requirements as may be in effect from time to time. The laws of some jurisdictions may require that certain persons take physical delivery in definitive form of securities which they own. Consequently, those persons may be prohibited from purchasing beneficial interests in the global notes from any beneficial owner or otherwise.

Redemption notices shall be sent to DTC. If less than all of the notes within an issue are being redeemed, DTC’s practice is to determine by lot the amount of the interest of each direct participant in such issue to be redeemed.

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So long as DTC’s nominee is the registered owner of the global notes, such nominee for all purposes will be considered the sole owner or holder of the notes for all purposes under the Indenture. Except as provided below, beneficial owners will not be entitled to have any of the notes registered in their names, will not receive or be entitled to receive physical delivery of the notes in definitive form and will not be considered the owners or holders thereof under the Indenture.

Neither DTC nor Cede & Co. (nor such other DTC nominee) will consent or vote with respect to the notes. Under its usual procedures, DTC mails an omnibus proxy to the issuer as soon as possible after the record date. The omnibus proxy assigns Cede & Co.’s consenting or voting rights to those direct participants to whose accounts the notes are credited on the record date (identified in a listing attached to the omnibus proxy).

All payments on the global notes will be made to Cede & Co., or such other nominee as may be requested by an authorized representative of DTC. DTC’s practice is to credit direct participants’ accounts upon DTC’s receipt of funds and corresponding detail information from trustees or issuers on payment dates in accordance with their respective holdings shown on DTC’s records. Payments by participants to beneficial owners will be governed by standing instructions and customary practices, as is the case with securities held for the accounts of customers in bearer form or registered in “street name,” and will be the responsibility of such participant and not of DTC, the Trustee or us, subject to any statutory or regulatory requirements as may be in effect from time to time. Payment of principal and interest to Cede & Co. (or such other nominee as may be requested by an authorized representative of DTC) shall be the responsibility of the Trustee or us, disbursement of such payments to direct participants shall be the responsibility of DTC, and disbursement of such payments to the beneficial owners shall be the responsibility of direct and indirect participants.

DTC may discontinue providing its service as securities depositary with respect to the notes at any time by giving reasonable notice to us or the Trustee. In addition, we may decide to discontinue use of the system of book-entry transfers through DTC (or a successor securities depositary). In the event that a successor securities depositary is not obtained under the above circumstances, or, alternatively, if an event of default with respect to the notes has occurred and is outstanding, note certificates in fully registered form are required to be printed and delivered to beneficial owners of the global notes representing such notes.

Secondary market trading between DTC participants will occur in the ordinary way in accordance with DTC’s rules and will be settled in immediately available funds using DTC’s same-day funds settlement system. Secondary market trading between Clearstream customers and/or Euroclear participants will occur in the ordinary way in accordance with the applicable rules and operating procedures of Clearstream and Euroclear and will be settled using the procedures applicable to conventional Eurobonds in immediately available funds.

Cross market transfers between persons holding directly or indirectly through DTC on the one hand, and directly or indirectly through Clearstream customers or Euroclear participants, on the other, will be effected in DTC in accordance with DTC’s rules on behalf of the relevant European international clearing system by its U.S. depositary; however, such cross market transactions will require delivery of instructions to the relevant European international clearing system by the counterparty in such system in accordance with its rules and procedures and within its established deadlines, in European time. The relevant European international clearing system will, if the transaction meets its settlement requirements, deliver instructions to its U.S. depository to take action to effect final settlement on its behalf by delivering interests in the notes to or receiving interests in the notes from DTC, and making or receiving payment in accordance with normal procedures for same-day funds settlement applicable to DTC. Clearstream customers and Euroclear participants may not deliver instructions directly to their respective U.S. depositaries.

Because of time-zone differences, credits of interests in the notes received by Clearstream or Euroclear as a result of a transaction with a DTC participant will be made during subsequent securities settlement processing and dated the Business Day following the DTC settlement date. Such credits or any transactions involving interests in such notes settled during such processing will be reported to the relevant Clearstream customers or Euroclear participants on such Business Day. Cash received by Clearstream or Euroclear as a result of sales of interests in the notes by or through a Clearstream customer or a Euroclear participant to a DTC participant will be received with value on the DTC settlement date but will be available in the relevant Clearstream or Euroclear cash account only as of the Business Day following settlement in DTC.

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The information in this section has been obtained from sources that we believe to be reliable, but we take no responsibility for its accuracy.

Neither we, the Trustee nor the underwriters will have any responsibility or obligation to direct participants, or the persons for whom they act as nominees, with respect to the accuracy of the records of DTC, its nominee or any direct participant with respect to any ownership interest in the notes, or payments to, or the providing of notice to direct participants or beneficial owners.

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MATERIAL U.S. FEDERAL INCOME TAX CONSIDERATIONS

The following is a summary of material U.S. federal income tax considerations relating to the purchase, ownership, and disposition of the notes, but does not purport to be a complete analysis of all the potential tax considerations relating thereto. This summary is based upon the provisions of the Internal Revenue Code of 1986, as amended (the “Code”), Treasury Regulations promulgated thereunder, administrative rulings and judicial decisions, all as in effect as of the date hereof, and all of which are subject to change, possibly with retroactive effect. We have not sought any ruling from the Internal Revenue Service (the “IRS”) with respect to the statements made and the conclusions reached in the following summary, and there can be no assurance that the IRS or a court will agree with such statements and conclusions.

This summary is limited to holders who purchase the notes upon their initial issuance at their initial “issue price” within the meaning of Section 1273 of the Code (i.e., the first price at which a substantial amount of the notes are sold to the public for cash, not including sales to bond houses, brokers or similar persons or organizations acting in the capacity of underwriters, placement agents or wholesalers) and who hold the notes as “capital assets” within the meaning of Section 1221 of the Code (generally, property held for investment). This summary does not address U.S. federal tax laws other than income tax laws, such as estate and gift tax laws, and it does not address tax considerations arising under the laws of any foreign, state or local jurisdiction. In addition, this discussion does not address all tax considerations that may be applicable to a holder’s particular circumstances, including the impact of the Medicare contribution tax on net investment income or the alternative minimum tax, or to holders that may be subject to special tax rules, including, without limitation:

•

banks, insurance companies, or other financial institutions;

•

tax-exempt organizations or governmental organizations;

•

regulated investment companies or real estate investment trusts;

•

brokers, dealers or traders in securities or commodities;

•

traders in securities that elect to use a mark-to-market method of accounting for their securities holdings;

•

foreign persons or entities (except to the extent specifically set forth below);

•

S-corporations, partnerships or other pass-through entities or arrangements (and investors therein);

•

U.S. expatriates and certain former citizens or long-term residents of the United States;

•

“U.S. holders” (as defined below under “— Consequences to U.S. Holders”) whose “functional currency” is not the United States dollar;

•

certain accrual method taxpayers subject to special tax accounting rules as a result of their use of financial statements under Section 451(b) of the Code;

•

persons who hold the notes as a position in a hedging transaction, “straddle,” “conversion transaction;” or

•

persons deemed to sell the notes under the constructive sale provisions of the Code.

If an entity or arrangement treated as a partnership for U.S. federal income tax purposes holds the notes, the tax treatment of a partner in the partnership generally will depend upon the status of the partner, the activities of the partnership, and certain determinations made at the partner level. Accordingly, partnerships holding the notes and the partners in such partnerships should consult their tax advisor regarding the tax consequences of the purchase, ownership, and disposition of the notes.

THIS SUMMARY OF MATERIAL U.S. FEDERAL INCOME TAX CONSIDERATIONS IS FOR GENERAL INFORMATION ONLY AND IS NOT LEGAL OR TAX ADVICE. YOU ARE URGED TO CONSULT YOUR TAX ADVISOR WITH RESPECT TO THE APPLICATION OF U.S. FEDERAL INCOME TAX LAWS TO YOUR PARTICULAR SITUATION AS WELL AS ANY TAX CONSEQUENCES OF THE PURCHASE, OWNERSHIP AND DISPOSITION OF THE NOTES

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ARISING UNDER OTHER U.S. FEDERAL TAX RULES OR UNDER THE LAWS OF ANY STATE, LOCAL, FOREIGN OR OTHER TAXING JURISDICTION OR UNDER ANY APPLICABLE TAX TREATY.

Classification of the Notes

The determination of whether a security should be classified as indebtedness or equity for U.S. federal income tax purposes requires a judgment based on all relevant facts and circumstances. There is no statutory, judicial, or administrative authority that directly addresses the U.S. federal income tax treatment of securities similar to the notes. In the opinion of McGuireWoods LLP, under current law and based on the facts contained in this prospectus supplement, the terms of the Indenture and the notes, and certain assumptions stated in the opinion and representations relied upon in rendering the opinion, the notes will be classified for U.S. federal income tax purposes as indebtedness of Exelon (although there is no controlling authority directly on point). This opinion is not binding on the IRS or any court and there can be no assurance that the IRS or a court will agree with this opinion.

Moreover, no rulings have been or will be sought from the IRS with respect to the transactions described in this prospectus supplement. Accordingly, we cannot assure you that the IRS will not challenge the opinion described herein or that a court would not sustain such a challenge. If the IRS were to successfully challenge the classification of the notes as indebtedness, interest payments on the notes would be treated for U.S. federal income tax purposes as dividends to the extent of Exelon’s current or accumulated earnings and profits. In the case of non-U.S. holders, interest payments treated as dividends would be subject to withholding of U.S. income tax, except to the extent such withholding is reduced by an applicable income tax treaty or except if the payments are effectively connected with the non-U.S. holder’s conduct of a trade or business in the United States (or, if an applicable U.S. income tax treaty applies, attributable to a permanent establishment maintained within the United States by the non-U.S. holder), in which case such payments would be subject to U.S. federal income tax on a net income basis in the same manner as if that non-U.S. holder were a U.S. holder (as described below). In addition, such a determination would constitute a Tax Event that would entitle us to redeem the notes as described under “Description of the Notes — Redemption — Redemption Following a Tax Event” above. We agree, and by acquiring an interest in a note, each beneficial owner of a note will agree, to treat the notes as indebtedness of Exelon for U.S. federal income tax purposes. You should consult your tax advisors regarding the tax consequences that will arise if the notes are not treated as indebtedness of Exelon for U.S. federal income tax purposes. The remainder of this discussion assumes that the notes will be respected as indebtedness for U.S. federal income tax purposes.

U.S. Holders

The following is a summary of certain material U.S. federal income tax consequences that will apply to you if you are a U.S. holder (as defined below) of the notes. Certain consequences to non-U.S. holders (as defined below under “— Consequences to Non-U.S. Holders”) of the notes are described under “— Consequences to Non-U.S. Holders” below. The term “U.S. holder” means a beneficial owner of a note that, for U.S. federal income tax purposes, is or is treated as:

•

an individual who is a citizen or resident of the United States;

•

a corporation (or other entity taxable as a corporation for U.S. federal income tax purposes) created or organized in or under the laws of the United States or of any state thereof or the District of Columbia;

•

an estate the income of which is subject to U.S. federal income taxation regardless of its source; or a trust that (i) is subject to the primary supervision of a United States court and the control of one or more “United States persons” (within the meaning of Section 7701(a)(30) of the Code), or (ii) has a valid election in effect under applicable Treasury Regulations to be treated as a United States person for U.S. federal income tax purposes.

Payments of Interest

Except as described below, a U.S. holder will be taxed on any stated interest on the notes at the time that such interest is received or accrued, in accordance with such U.S. holder’s method of accounting for U.S. federal income tax purposes.

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Original Issue Discount

Special rules apply with respect to debt instruments that are issued with original issue discount (“OID”). Under applicable Treasury Regulations relating to OID, the possibility that stated interest on the notes might be deferred (see “Description of the Notes — Option to Defer Interest Payments”) could result in the notes being treated as issued with OID, unless the likelihood of such deferral is considered “remote”. We believe and intend to take the position that the likelihood of exercising our option to defer payment of stated interest is “remote” within the meaning of the Treasury Regulations in part because the exercise of the option to defer payments of stated interest on the notes generally would prevent us from: (1) declaring or paying any dividend or distribution on our capital stock; (2) redeeming, purchasing, acquiring or making a liquidation payment with respect to any of our capital stock; (3) paying any principal, interest or premium on, or repaying, repurchasing or redeeming any of our debt securities that rank on parity with, or junior to, the notes in the right of payment; or (4) making any payments with respect to any guarantee of debt securities if such guarantee ranks on parity with or junior to the notes in the right of payment. Similarly, in certain circumstances (see “Description of the Notes — Redemption — Redemption Following a Rating Agency Event”), we may be obligated to pay amounts in excess of stated interest on or principal of the notes. Such excess payments will not affect the amount of interest income that a U.S. holder recognizes if there is only a remote likelihood that such payments will be made. We believe and intend to take the position that the likelihood that we will make any such payments is remote. Our determination regarding the remoteness of these contingencies is binding on a holder, unless the holder discloses in the proper manner to the IRS that it is taking a different position.

In addition to the foregoing, we believe that the notes should be treated for U.S. federal income tax purposes as “variable rate debt instruments” that provide for a single fixed rate followed by a qualified floating rate (a “QFR”). Applicable Treasury Regulations set forth rules to determine whether the fixed rate and the QFR result in a debt instrument being treated as issued with OID at time of issuance. It is our expectation that the initial interest rate (the “fixed rate”) and the interest rate on each Reset Date (the “floating rate”) for the notes will be set in a manner that will not result in OID. In light of the foregoing rules applicable to the notes, we expect that the notes will not be issued with OID. Accordingly, except as set forth below, each U.S. holder should include in gross income such U.S. holder’s allocable share of interest on the notes in accordance with such U.S. holder’s method of tax accounting.

However, if the IRS were to successfully challenge our position regarding the remoteness of the contingencies described above, or if the fixed rate and floating rate were to be set in a manner inconsistent with our expectations, the notes would be treated as issued with OID at the time of issuance. Specifically:

•

If the possibility of interest deferral was determined not to be remote, the notes would be treated as issued with OID and all stated interest on the notes would be treated as OID.

•

If any portion of interest pursuant to the fixed rate or the floating rate is determined as of the issue date to be in excess of “qualified stated interest” on the notes, such excess, if significant enough, would potentially give rise to OID.

Further, under the Treasury Regulations, if we exercise our option to defer the payment of interest on the notes (see “Description of the Notes — Option to Defer Interest Payments”), the notes will be treated at such time, solely for purposes of the OID rules, as if they had been retired and reissued with OID, and the sum of the remaining interest payments on the notes would be OID.

In the event the notes are treated as issued with OID, each U.S. holder would be required to accrue and include OID in taxable income on a constant yield basis before the receipt of the cash attributable to the interest (regardless of that U.S. holder’s method of tax accounting), and actual distributions of stated interest would not be reported as taxable income. Any OID included in income by a U.S. holder would increase such U.S. holder’s adjusted tax basis in the notes, and the actual receipt of cash interest payments would reduce such adjusted tax basis.

Additionally, if the IRS were to determine that the possibility of excess payments was not remote, the notes could be treated as “contingent payment debt instruments,” in which case a U.S. holder would be required to accrue interest income on the notes in excess of the stated interest and treat as ordinary income rather than as capital gain income realized on the taxable disposition of the notes. In the event excess payments

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are made, the U.S. holder will be required to recognize such amounts as income. The remainder of this discussion assumes that the notes will not be treated as contingent payment debt instruments.

Sale, Exchange, Redemption or Other Taxable Disposition of Notes

Upon the sale, exchange, redemption or other taxable disposition of a note, a U.S. holder generally will recognize gain or loss equal to the difference between the amount realized on the sale, exchange, redemption or retirement and such U.S. holder’s adjusted tax basis in the note. For these purposes, the amount realized does not include any amount attributable to accrued but unpaid interest not previously included in income, which will constitute ordinary income. If the notes have not been subject to the OID rules, then a U.S. holder’s adjusted tax basis in the notes generally will be the initial purchase price paid by such U.S. holder to acquire such U.S. holder’s interest in the notes. If the notes have been subject to the OID rules, then a U.S. holder’s tax basis in a note generally would be increased by any OID previously includible in such U.S. holder’s gross income through the date of disposition and decreased by payments received by such U.S. holder on the notes in respect of accrued OID. Gain or loss realized on the sale, exchange, redemption, or retirement of a note generally will be capital gain or loss and will be long-term capital gain or loss if at the time of the sale, exchange, redemption, or retirement the note has been held by that U.S. holder for more than one year. A U.S. holder that is an individual generally is entitled to preferential treatment for net long-term capital gains. Deductions for capital losses are subject to certain limitations. With respect to a particular taxable year, capital losses realized generally may be used by a corporate taxpayer only to the extent of realized capital gains for such taxable year and generally may be used by an individual taxpayer only to the extent of realized capital gains plus $3,000 of other income for such taxable year.

Backup Withholding and Information Reporting

Information reporting requirements generally apply in connection with payments on the notes to, and proceeds received from a sale or other disposition of the notes by, non-corporate U.S. holders. A U.S. holder will be subject to backup withholding tax on such payments and proceeds if the U.S. holder fails to provide its correct taxpayer identification number to the paying agent in the manner required under U.S. federal income tax law, fails to comply with applicable backup withholding tax rules, or does not otherwise establish an exemption from backup withholding. Backup withholding is not an additional tax. Any amounts withheld from a U.S. holder under the backup withholding rules will entitle such U.S. holder to a credit against such U.S. holder’s U.S. federal income tax liability and may entitle such U.S. holder to a refund of any excess amounts withheld, provided that the required information is timely and properly furnished to the IRS to obtain such refund.

U.S. holders should consult their tax advisors regarding the application of backup withholding in their particular situations and the availability of any exemption from backup withholding, along with the procedures for obtaining any such exemption, if available.

Non-U.S. Holders

The following is a summary of certain material U.S. federal income tax consequences that will apply to you if you are a non-U.S. holder of the notes. The term “non-U.S. holder” means a beneficial owner of a note that is not a partnership (or other entity or arrangement treated as a partnership for U.S. federal income tax purposes) or a U.S. holder.

Special rules may apply to certain non-U.S. holders, such as “controlled foreign corporations” and “passive foreign investment companies.” Such entities should consult their tax advisors to determine the U.S. federal, state, local and other tax consequences that may be relevant to them.

Payments of Interest

Subject to the discussion of backup withholding and information reporting and FATCA below, and assuming that the notes will be treated as indebtedness for U.S. federal income tax purposes, no withholding of U.S. federal income tax will apply to interest paid on a note to a non-U.S. holder under the “portfolio interest exemption,” provided that:

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•

the interest is not effectively connected with the non-U.S. holder’s conduct of a trade or business in the United States;

•

the non-U.S. holder does not actually or constructively own 10% or more of the total combined voting power of all classes of our stock entitled to vote;

•

the non-U.S. holder is not a bank whose receipt of interest with respect to a note is described in Section 881(c)(3)(A) of the Code;

•

the non-U.S. holder is not a “controlled foreign corporation” that is related directly or constructively to us through stock ownership; and

•

the non-U.S. holder provides to the withholding agent, in accordance with specified procedures, a statement to the effect that such non-U.S. holder is not a United States person (generally by providing a properly executed IRS Form W-8BEN or IRS Form W-8BEN-E, as applicable).

If a non-U.S. holder cannot satisfy the requirements of the “portfolio interest exemption” described above, interest paid on the notes (including payments in respect of OID, if any, on the notes) made to a non-U.S. holder will be subject to a U.S. federal withholding tax at a rate of 30%, unless such non-U.S. holder provides the withholding agent with a properly executed statement (i) claiming an exemption from or reduction of withholding under an applicable U.S. income tax treaty or (ii) stating that the interest is not subject to withholding tax because it is effectively connected with such non-U.S. holder’s conduct of a trade or business in the United States.

If a non-U.S. holder is engaged in a trade or business in the United States (or, if pursuant to an applicable U.S. income tax treaty, the non-U.S. holder maintains a permanent establishment within the United States) and the interest is effectively connected with the conduct of that trade or business (or, if pursuant to an applicable U.S. income tax treaty, the interest is attributable to that permanent establishment), such non-U.S. holder will be subject to U.S. federal income tax on the interest on a net income basis in the same manner as if such non-U.S. holder were a U.S. holder (as described above). In addition, if such non-U.S. holder is a foreign corporation, it may also, under certain circumstances, be subject to an additional branch profits tax at a 30% rate or such lower rate as may be specified by an applicable U.S. income tax treaty.

The certifications described above generally must be provided to the applicable withholding agent prior to the payment of interest and must be updated periodically. Non-U.S. holders that do not timely provide the applicable withholding agent with the required certification, but that qualify for a reduced rate under an applicable U.S. income tax treaty, may obtain a refund of any excess amounts withheld by timely filing an appropriate claim for refund with the IRS. Non-U.S. holders should consult their tax advisors regarding their entitlement to benefits under any applicable U.S. income tax treaty.

Sale, Exchange, Redemption or Other Taxable Disposition of Notes

Subject to the discussion of backup withholding and information reporting and FATCA below, any gain realized upon the sale, exchange, redemption or other taxable disposition of a note (other than any amount allocable to accrued and unpaid interest, which will be taxable as interest and may be subject to the rules discussed above in “— Consequences to Non-U.S. Holders — Payments of Interest”) generally will not be subject to U.S. federal income tax unless:

•

such gain is effectively connected with the non-U.S. holder’s conduct of a trade or business in the United States (or, if pursuant to an applicable U.S. income tax treaty, such gain is attributable to a permanent establishment maintained by the non-U.S. holder in the United States); or

•

the non-U.S. holder is an individual who is present in the United States for 183 days or more in the taxable year of the disposition of a note, and certain other conditions are met.

Proceeds from the disposition of a note that are attributable to accrued but unpaid interest generally will be subject to, or exempt from, tax to the same extent as described above under “— Payments of Interest” with respect to interest paid on a note.

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Backup Withholding and Information Reporting

The amount of interest paid on the notes to non-U.S. holders generally must be reported annually to the IRS. These reporting requirements apply regardless of whether withholding was reduced or eliminated by any applicable U.S. income tax treaty. Copies of the information returns reflecting income in respect of the notes may also be made available to the tax authorities in the country in which the non-U.S. holder is a resident under the provisions of an applicable U.S. income tax treaty or information sharing agreement.

A non-U.S. holder generally will not be subject to additional information reporting or to backup withholding with respect to payments on the notes or to information reporting or backup withholding with respect to the receipt of proceeds from the sale or other disposition of the notes to or through a U.S. office of any broker, so long as the holder:

•

has furnished to the payor or broker a properly executed IRS Form W-8BEN or IRS Form W-8BEN-E, as applicable, certifying, under penalties of perjury, the non-U.S. holder’s status as a non-U.S. person;

•

has furnished to the payor or broker other documentation upon which it may rely to treat the payments as made to a non-U.S. person in accordance with applicable Treasury Regulations; or

•

otherwise establishes an exemption.

The payment of the proceeds from a sale or other disposition of the notes to or through a foreign office of a broker generally will not be subject to information reporting or backup withholding. However, a sale or disposition of the notes will be subject to information reporting, but not backup withholding, if it is to or through a foreign office of a U.S. broker or a non-U.S. broker with certain enumerated connections with the United States, unless the documentation requirements described above are met or the holder otherwise establishes an exemption.

Backup withholding is not an additional tax. Any amounts withheld under the backup withholding rules from a payment to a non-U.S. holder will be allowed as a credit against such holder’s U.S. federal income tax liability, if any, or any excess amounts withheld will otherwise be refundable, provided that the requisite procedures are followed and the proper information is filed with the IRS on a timely basis to obtain any such refund. Non-U.S. holders should consult their own tax advisors regarding their qualification for any exemption from backup withholding and the procedure for obtaining such exemption, if applicable.

Foreign Account Tax Compliance Act

Pursuant to sections 1471 through 1474 of the Code (commonly referred to as the Foreign Accounts Tax Compliance Act or “FATCA”), and under associated Treasury Regulations and related administrative guidance, a U.S. federal withholding tax at a 30% rate applies to “withholdable payments” received by certain non-U.S. holders, if certain disclosure requirements related to U.S. ownership or accounts are not satisfied (generally by providing a properly executed IRS Form W-8BEN or Form W-8BEN-E, as applicable, or other applicable and/or successor forms). An applicable intergovernmental agreement regarding FATCA between the United States and a foreign jurisdiction may modify the rules discussed in this paragraph. For this purpose, “withholdable payments” generally include payments of interest on, and payments of gross proceeds from the sale or other disposition of, the notes. However, the IRS issued proposed Treasury Regulations that eliminate FATCA withholding on payments of gross proceeds (but not on payments of interest). Pursuant to the preamble to the proposed Treasury Regulations, we and any withholding agent may (but are not required to) rely on this proposed change to FATCA withholding until final Treasury Regulations are issued on this matter. Prospective investors should consult their tax advisors regarding the potential application of FATCA to their investment in the notes. If U.S. federal withholding tax under FATCA, or otherwise, is required on payments made to any holder of the notes, such withheld amount will be paid over to the IRS. That payment, if made, will be treated as a payment of cash to the holder of the notes with respect to whom the payment was made and will reduce the amount of cash to which such holder would otherwise be entitled.

The U.S. federal income tax discussion set forth above is included for general information purposes only and may not be applicable depending upon a holder’s particular situation. Prospective investors should consult their tax advisors regarding the tax consequences to them of the purchase, ownership, and disposition of notes, including the tax consequences under state, local, foreign, and other tax laws.

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UNDERWRITING

Barclays Capital Inc., Citigroup Global Markets Inc., Goldman Sachs & Co. LLC, J.P. Morgan Securities LLC and Morgan Stanley & Co. LLC are acting as representatives of the underwriters set forth below. Subject to the terms and conditions contained in an underwriting agreement between us and the underwriters, we have agreed to sell to the underwriters and the underwriters have severally agreed to purchase from us, the principal amount of the notes listed opposite their names below:

Underwriter	Principal Amount of Notes
Barclays Capital Inc.		$
Citigroup Global Markets Inc.
Goldman Sachs & Co. LLC
J.P. Morgan Securities LLC
Morgan Stanley & Co. LLC
Credit Agricole Securities (USA) Inc.
RBC Capital Markets, LLC
Wells Fargo Securities, LLC
Loop Capital Markets LLC
M&T Securities, Inc.
Total		$

The obligations of the several underwriters to purchase the notes are subject to certain conditions as set forth in the underwriting agreement. The underwriters are obligated to purchase all of the notes if they purchase any of the notes. The underwriting agreement also provides that if an underwriter defaults, the purchase commitments of the non-defaulting underwriter may be increased or the offering of notes may be terminated. The offering of the notes by the underwriters is subject to receipt and acceptance and subject to the underwriters’ right to reject any order in whole or in part.

We expect to deliver the notes on or about the date specified on the cover page of this prospectus supplement, which will be the third business day following the date of this prospectus supplement (T+3). Under Rule 15c6-1 under the Exchange Act, trades in the secondary market generally are required to settle in one business day, unless the parties to any such trade expressly agree otherwise. Accordingly, purchasers who wish to trade notes on the date of this prospectus supplement or the next two succeeding business days will be required, by virtue of the fact that the notes initially will settle in T+3, to specify an alternate settlement cycle at the time of any such trade to prevent failed settlement and should consult their own advisors.

The underwriters have advised us that they propose to initially offer the notes to the public at the relevant price to public appearing on the cover page of this prospectus supplement and may also offer the notes to certain securities dealers at the relevant price to public on the cover of this prospectus supplement less a concession of % of the principal amount of the notes. The underwriters may allow, and such dealers may re-allow, a discount to certain brokers and dealers not in excess of % of the principal amount of the notes. After the initial public offering, the relevant price to public, concession and discount may be changed.

There is no established trading market for the notes, and the underwriters are not obligated to make a market in the notes. We do not intend to apply for listing of the notes on any securities exchange. The underwriters have advised us that they intend to make a market in the notes but are not obligated to do so and may discontinue such market-making activities at any time without notice. We cannot give any assurance as to the maintenance of the trading market for, or the liquidity of, the notes, the ability of the holders to sell their notes or the price at which holders will be able to sell their notes.

In connection with the offering, the underwriters may engage in transactions that stabilize the price of the notes. These transactions may include purchases for the purpose of fixing or maintaining the price of the notes.

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The underwriters may create a short position in the notes in connection with the offering. That means they sell a larger principal amount of the notes than is shown on the cover page of this prospectus supplement. If they create a short position, the underwriters may purchase notes in the open market to reduce the short position.

If the underwriters purchase the notes to stabilize the price or to reduce their short position, the price of the notes could be higher than it might be if they had not made such purchases. The underwriters make no representation or prediction about any effect that purchases may have on the price of the notes and any of such transactions may be discontinued at any time.

The underwriters also may impose a penalty bid. This occurs when a particular underwriter repays to the underwriters a portion of the underwriting discount received by it because the underwriters or their affiliates have repurchased notes sold by or for the account of such underwriter in stabilizing or short covering transactions.

We have agreed to indemnify the several underwriters against certain civil liabilities, including liabilities under the Securities Act of 1933, or to contribute with respect to payments which the underwriters may be required to make in respect of any of those liabilities.

Our expenses associated with the offer and sale of the notes, excluding the underwriting discount, are estimated to be approximately $ .

The underwriters and their respective affiliates are full service financial institutions engaged in various activities. From time to time, in the ordinary course of business, the underwriters and their respective affiliates have engaged and may in the future engage, in sales and trading, commercial banking, investment banking advisory, investment management, investment research, principal investment, hedging, market making, brokerage and other financial and non-financial activities and services and/or other transactions of a financial nature with us and our affiliates. Consequently, they have received, and in the future may continue to receive, customary fees and commissions for these services. The underwriters or their affiliates may provide credit to us or our affiliates as lenders from time to time, including under our existing revolving credit facility.

In addition, in the ordinary course of their business activities, the underwriters and their affiliates may make or hold a broad array of investments and actively trade debt and equity securities (or related derivative securities) and financial instruments (including bank loans) for their own account and for the accounts of their customers. Such investments and securities activities may involve securities and/or instruments of ours or our affiliates. If any of the underwriters or their affiliates have a lending relationship with us, certain of those underwriters or their affiliates routinely hedge, and certain other of those underwriters or their affiliates may hedge, their credit exposure to us consistent with their customary risk management policies. Typically, such underwriters and their affiliates would hedge such exposure by entering into transactions which consist of either the purchase of credit default swaps or the creation of short positions in our securities, including potentially the notes offered hereby. Any such credit default swaps or short positions could adversely affect future trading prices of the notes offered hereby. The underwriters and their affiliates may also make investment recommendations and/or publish or express independent research views in respect of such securities or financial instruments and may hold, or recommend to clients that they acquire, long and/or short positions in such securities and instruments.

European Economic Area

The notes may not be offered, sold or otherwise made available to any retail investor in the EEA. For the purposes of this provision:

(a)

the expression “retail investor” means a person who is one (or more) of the following:

(i)

a retail client as defined in point (11) of Article 4(1) of MiFID II; or

(ii)

a customer within the meaning of the Insurance Distribution Directive, where that customer would not qualify as a professional client as defined in point (10) of Article 4(1) of MiFID II; or

(iii)

not a qualified investor as defined in the Prospectus Regulation; and

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(b)

the expression “offer” includes the communication in any form and by any means of sufficient information on the terms of the offer and the notes to be offered so as to enable an investor to decide to purchase or subscribe for the notes.

United Kingdom

The notes may not be offered, sold or otherwise made available to any retail investor in the United Kingdom. For the purposes of this provision:

(a)

the expression “retail investor” means a person who is one (or more) of the following:

(i)

a retail client, as defined in point (8) of Article 2 of Regulation (EU) No 2017/565 as it forms part of domestic law in the United Kingdom by virtue of the EUWA; or

(ii)

a customer within the meaning of the provisions of the FSMA and any rules or regulations made under the FSMA to implement the Insurance Distribution Directive, where that customer would not qualify as a professional client, as defined in point (8) of Article 2(1) of Regulation (EU) No 600/2014 as it forms part of domestic law in the United Kingdom by virtue of the EUWA; or

(iii)

not a qualified investor as defined in Article 2 of the UK Prospectus Regulation; and

(b)

Other Regulatory Restrictions in the United Kingdom

Any invitation or inducement to engage in investment activity (within the meaning of Section 21 of the FSMA) in connection with the issue or sale of the notes may only be communicated or caused to be communicated in circumstances in which Section 21(1) of the FSMA does not apply to Exelon.

All applicable provisions of the FSMA must be complied with in respect to anything done by any person in relation to the notes in, from or otherwise involving the United Kingdom.

Canada

The notes may be sold only to purchasers purchasing, or deemed to be purchasing, as principal that are accredited investors, as defined in National Instrument 45-106 Prospectus Exemptions or subsection 73.3(1) of the Securities Act (Ontario), and are permitted clients, as defined in National Instrument 31-103 Registration Requirements, Exemptions and Ongoing Registrant Obligations. Any resale of the notes must be made in accordance with an exemption from, or in a transaction not subject to, the prospectus requirements of applicable securities laws.

Securities legislation in certain provinces or territories of Canada may provide a purchaser with remedies for rescission or damages if this prospectus supplement (including any amendment thereto) contains a misrepresentation, provided that the remedies for rescission or damages are exercised by the purchaser within the time limit prescribed by the securities legislation of the purchaser’s province or territory. The purchaser should refer to any applicable provisions of the securities legislation of the purchaser’s province or territory for particulars of these rights or consult with a legal advisor.

Pursuant to section 3A.3 of National Instrument 33-105 Underwriting Conflicts (NI 33-105), the underwriters are not required to comply with the disclosure requirements of NI 33-105 regarding underwriter conflicts of interest in connection with this offering.

Hong Kong

No notes may be offered or sold in Hong Kong, by means of any document, other than: (i) to “professional investors” (as defined in the Securities and Futures Ordinance (Cap. 571, Laws of Hong Kong) (the “SFO”)) and any rules made thereunder; or (ii) in other circumstances which do not result in the

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document being a “prospectus” (as defined in the Companies (Winding Up and Miscellaneous Provisions) Ordinance (Cap. 32, Laws of Hong Kong) (the “Ordinance”)) or which do not constitute an offer to the public within the meaning of the Ordinance. No advertisement, invitation or document relating to the notes, which is directed at, or the contents of which are likely to be accessed or read by, the public of Hong Kong (except if permitted to do so under the securities laws of Hong Kong) has been or will be issued or has been or may be in the possession of any person for purpose of issue (in each case whether in Hong Kong or elsewhere) other than with respect to the notes which are or are intended to be disposed of only to persons outside Hong Kong or only to “professional investors” (as defined in the SFO) and any rules made thereunder.

The contents of this prospectus supplement and the accompanying prospectus have not been reviewed by any regulatory authority in Hong Kong. You are advised to exercise caution in relation to the offer. If you are in doubt about any of the contents of this prospectus supplement and the accompanying prospectus, you should obtain independent professional advice.

Japan

The notes have not been and will not be registered under the Financial Instruments and Exchange Law of Japan (Law No. 25 of 1948, as amended, the “FIEA”) and each underwriter has agreed that it will not offer or sell any securities, directly or indirectly, in Japan or to, or for the account or the benefit of, any resident of Japan (which term as used herein means any person resident in Japan, including any corporation or other entity organized under the laws of Japan), or to others for re-offering or resale, directly or indirectly, in Japan or to, or for the account or the benefit of, any resident of Japan, except pursuant to an exemption from the registration requirements of, and otherwise in compliance with, the FIEA and any other applicable laws, regulations and ministerial guidelines of Japan.

Korea

The notes have not been and will not be registered with the Financial Services Commission of Korea under the Financial Investment Services and Capital Markets Act of Korea. Each underwriter has represented and agreed that the notes may not be offered, sold or delivered, directly or indirectly, in Korea or to, or for the account or benefit of, any resident of Korea (as defined in the Foreign Exchange Transactions Law of Korea and its Enforcement Decree) or to others for re-offering or resale, except as otherwise permitted by applicable Korean laws and regulations. In addition, within one year following the issuance of the notes, the notes may not be transferred to any resident of Korea other than a qualified institutional buyer (as such term is defined in the Regulation on Issuance, Public Disclosure, etc. of securities of Korea, a “Korean QIB”) registered with the Korea Financial Investment Association (the “KOFIA”) as a Korean QIB and subject to the requirement of monthly reports with the KOFIA of its holding of Korean QIB bonds as defined in the Regulation on Issuance, Public Disclosure, etc. of notes of Korea, provided that (a) the notes are denominated, and the principal and interest payments thereunder are made, in a currency other than Korean won, (b) the amount of the securities acquired by such Korean QIBs in the primary market is limited to less than 20% of the aggregate issue amount of the notes (c) the notes are listed on one of the major overseas securities markets designated by the Financial Supervisory Service of Korea, or certain procedures, such as registration or report with a foreign financial investment regulator, have been completed for offering of the securities in a major overseas securities market, (d) the one-year restriction on offering, delivering or selling of securities to a Korean resident other than a Korean QIB is expressly stated in the securities, the relevant purchase agreement, the subscription agreement and the offering circular and (e) the Company and the underwriters shall individually or collectively keep the evidence of fulfillment of conditions (a) through (d) above after having taken necessary actions therefor.

Singapore

This prospectus supplement and the accompanying prospectus have not been registered as a prospectus under the Securities and Futures Act, Chapter 289 of Singapore (the “SFA”) with the Monetary Authority of Singapore, and the offer of the notes in Singapore is made primarily pursuant to the exemptions under Sections 274 and 275 of the SFA. Accordingly, each underwriter has represented and agreed that (a) it has not circulated or distributed and will not circulate or distribute this prospectus supplement and the accompanying prospectus and any other document or material in connection with the offer or sale, or

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invitation for subscription or purchase, of the notes, (b) has not offered or sold and will not offer or sell any Notes, and (c) has not made and will not make any Notes to be the subject of an invitation for subscription or purchase, whether directly or indirectly, in each of the cases of (a) to (c), to persons in Singapore other than (i) to an institutional investor as defined in Section 4A of the SFA (“Institutional Investor”) pursuant to Section 274 of the SFA, (ii) to an accredited investor as defined in Section 4A of the SFA (an “Accredited Investor”) or other relevant person pursuant to Section 275(2) of the SFA (a “Relevant Person”), or any person pursuant to Section 275(1A) of the SFA and (where applicable) Regulation 3 of the Securities and Futures (Classes of Investors)Regulations 2018, and in accordance with the conditions specified in Section 275 of the SFA or (iii) otherwise pursuant to, and in accordance with the conditions of, any other applicable provision of the SFA.

This prospectus supplement and the accompanying prospectus and any other document or material in connection with the offer or sale, or invitation for subscription or purchase, of the notes may not be circulated or distributed, nor may any Notes be offered or sold, or be made the subject of an invitation for subscription or purchase, whether directly or indirectly, to persons in Singapore other than (i) to an Institutional Investor, (ii) to an Accredited Investor or other Relevant Person, or any person pursuant to Section 275(1A) of the SFA and (where applicable) Regulation 3 of the Securities and Futures (Classes of Investors) Regulations 2018, and in accordance with the conditions specified in Section 275 of the SFA, or (iii) otherwise pursuant to, and in accordance with the conditions of, any other applicable provision of the SFA.

Where the notes are subscribed or purchased under Section 275 of the SFA by a relevant person which is: (a) a corporation (which is not an Accredited Investor ) the sole business of which is to hold investments and the entire share capital of which is owned by one or more individuals, each of whom is an Accredited Investor; or (b) a trust (where the trustee is not an Accredited Investor) whose sole purpose is to hold investments and each beneficiary of the trust is an individual who is an Accredited Investor, securities (as defined in Section 239(1) of the SFA) of that corporation or the beneficiaries’ rights and interest (howsoever described) in that trust shall not be transferred within six months after that corporation or that trust has acquired the notes pursuant to an offer made under Section 275 of the SFA except: (1) to an Institutional Investor or to an Accredited Investor or other Relevant Person, or to any person arising from an offer referred to in Section 275(1A) of the SFA (in the case of that corporation) or Section 276(4)(i)(B) of the SFA (in the case of that trust); (2) where no consideration is or will be given for the transfer; (3) where the transfer is by operation of law; (4) as specified in Section 276(7) of the SFA; or (5) as specified in Regulation 37A of the Securities and Futures (Offers of Investments) (Securities and Securities-based Derivatives Contracts) Regulations 2018 of Singapore.

Singapore Securities and Futures Act Product Classification — Solely for the purposes of its obligations pursuant to sections 309B(1)(a) and 309B(1)(c) of the SFA, we have determined, and hereby notify all relevant persons (as defined in Section 309A of the SFA) that the notes are “prescribed capital markets products” (as defined in the Securities and Futures (Capital Markets Products) Regulations 2018) and Excluded Investment Products (as defined in MAS Notice SFA 04-N12: Notice on the Sale of Investment Products and MAS Notice FAA-N16: Notice on Recommendations on Investment Products).

Switzerland

This prospectus supplement and the accompanying prospectus are not intended to constitute an offer or solicitation to purchase or invest in the notes. The notes may not be publicly offered, directly or indirectly, in Switzerland within the meaning of the Swiss Financial Services Act (the “FinSA”), and no application has or will be made to admit the notes to trading on any trading venue (exchange or multilateral trading facility) in Switzerland. Neither this prospectus supplement, the accompanying prospectus nor any other offering or marketing material relating to the notes constitutes a prospectus pursuant to the FinSA, and neither this prospectus supplement, the accompanying prospectus, nor any other offering or marketing material relating to the notes may be publicly distributed or otherwise made publicly available in Switzerland.

Taiwan

The notes have not been and will not be registered with the Financial Supervisory Commission of Taiwan, the Republic of China (Taiwan), pursuant to relevant securities laws and regulations and may not be offered or sold in Taiwan through a public offering or in any manner which would constitute an offer

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within the meaning of the Securities and Exchange Act of Taiwan or would otherwise require registration with or the approval of the Financial Supervisory Commission of Taiwan. No person or entity in Taiwan has been authorized to offer, sell, give advice regarding or otherwise intermediate the offering or sale of the notes in Taiwan.

United Arab Emirates

The notes have not been, and are not being, publicly offered, sold, promoted or advertised in the United Arab Emirates (including the Dubai International Financial Centre) other than in compliance with the laws of the United Arab Emirates (and the Dubai International Financial Centre) governing the issue, offering and sale of securities. Further, this prospectus does not constitute a public offer of securities in the United Arab Emirates (including the Dubai International Financial Centre) and is not intended to be a public offer. This prospectus has not been approved by or filed with the Central Bank of the United Arab Emirates, the Securities and Commodities Authority or the Dubai Financial Services Authority.

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LEGAL MATTERS

Ballard Spahr LLP, Philadelphia, Pennsylvania will render an opinion as to the validity of the notes for us. Certain U.S. federal income tax matters will be passed upon for Exelon by McGuireWoods LLP, Atlanta, Georgia, special tax counsel to Exelon. Certain legal matters will be passed on for the underwriters by Winston & Strawn LLP, Houston, Texas. Winston & Strawn LLP provides legal services to Exelon and its subsidiaries from time to time.

EXPERTS

The financial statements and management’s assessment of the effectiveness of internal control over financial reporting (which is included in Management’s Report on Internal Control over Financial Reporting) of Exelon Corporation incorporated in this prospectus supplement by reference to the Annual Report on Form 10-K for the year ended December 31, 2024 have been so incorporated in reliance on the report of PricewaterhouseCoopers LLP, an independent registered public accounting firm, given on the authority of said firm as experts in auditing and accounting.

WHERE YOU CAN FIND MORE INFORMATION

We file annual, quarterly and current reports, information statements and other information with the SEC. You may read and copy any document we have filed or will file with the SEC at the SEC’s public website (www.sec.gov).

Information about us is also available on Exelon’s web site at http://www.exeloncorp.com. This web site and the SEC’s web site above are intended to be inactive textual references only. Information on Exelon’s or the SEC’s web site (other than the documents incorporated by reference) is not a part of this prospectus supplement.

DOCUMENTS INCORPORATED BY REFERENCE

The SEC allows us to “incorporate by reference” information that we file with the SEC, which means that we can disclose important information to you by referring you to the documents we file with the SEC. The information incorporated by reference is an important part of this prospectus supplement and the accompanying prospectus, and information that we file later with the SEC will automatically update and supersede this information. This incorporation by reference does not include documents that are furnished but not filed with the SEC. We incorporate by reference the documents listed below and any future documents that we file with the SEC under Section 13(a), 13(c), 14 or 15(d) of the Securities Exchange Act of 1934, as amended (known as the Exchange Act) but prior to the termination of any offering of securities made by this prospectus:

•

Exelon’s Annual Report on Form 10-K for the year ended December 31, 2024

You can also find more information about us from the sources described under “Documents Incorporated by Reference” in the accompanying prospectus.

Upon written or oral request, we will provide without charge to each person, including any beneficial owner, to whom this prospectus supplement and the accompanying prospectus is delivered, a copy of any or all of such documents which are incorporated herein by reference (other than exhibits to such documents unless such exhibits are specifically incorporated by reference into the documents that this prospectus supplement and the accompanying prospectus incorporate). Written or oral requests for copies should be directed to Exelon Corporation, Attn: Investor Relations, 10 South Dearborn Street, 54th Floor, P.O. Box 805398, Chicago, IL 60680-5398, 312-394-2345.

Any statement contained in this prospectus supplement and the accompanying prospectus, or in a document all or a portion of which is incorporated by reference, shall be modified or superseded for purposes of this prospectus supplement and the accompanying prospectus to the extent that a statement contained in this prospectus supplement, the accompanying prospectus, any supplement or any document incorporated by reference modifies or supersedes such statement. Any such statement so modified or

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superseded shall not, except as so modified or superseded, constitute a part of this prospectus supplement or the accompanying prospectus.

All reports and other documents subsequently filed by us pursuant to Sections 13(a), 13(c), 14 and 15(d) of the Exchange Act, prior to the filing of a post-effective amendment, which indicates that all of a class of securities offered hereby have been sold or which deregisters all of a class of securities then remaining unsold, shall be deemed incorporated by reference herein and to be a part hereof from the date of filing of such documents.

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$7,200,000,000

EXELON CORPORATION

Debt Securities

Common Stock

Stock Purchase Contracts

Stock Purchase Units

Preferred Stock

COMMONWEALTH EDISON COMPANY

Debt Securities

POTOMAC ELECTRIC POWER COMPANY

Debt Securities

Exelon Corporation (Exelon) may use this prospectus to offer and sell from time to time:

•

debt securities;

•

common stock;

•

stock purchase contracts;

•

stock purchase units; and

•

preferred stock in one or more series.

Commonwealth Edison Company (ComEd) may use this prospectus to offer and sell from time to time:

•

debt securities

Potomac Electric Power Company (Pepco) may use this prospectus to offer and sell from time to time:

•

debt securities

Exelon, ComEd and Pepco sometimes refer to the securities listed above as the “Securities.”

Exelon, ComEd and Pepco will provide the specific terms of the Securities in supplements to this prospectus prepared in connection with each offering. Please read this prospectus and the applicable prospectus supplement carefully before you invest. This prospectus may not be used to consummate sales of the offered Securities unless accompanied by a prospectus supplement.

Exelon’s common shares are listed on the Nasdaq Stock Market LLC, under the symbol “EXC.”

Please see “Risk Factors” beginning on page 2 for a discussion of factors you should consider in connection with a purchase of the Securities offered in this prospectus.

Neither the Securities and Exchange Commission nor any state securities commission has approved or disapproved of the Securities or determined if this prospectus is truthful or complete. Any representation to the contrary is a criminal offense.

The date of this prospectus is May 1, 2024.

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	Page
ABOUT THIS PROSPECTUS		1
FORWARD-LOOKING STATEMENTS		1
RISK FACTORS		2
EXELON CORPORATION		2
COMMONWEALTH EDISON COMPANY		2
POTOMAC ELECTRIC POWER COMPANY		2
USE OF PROCEEDS		2
DESCRIPTION OF SECURITIES		3
PLAN OF DISTRIBUTION		19
LEGAL MATTERS		21
EXPERTS		21
WHERE YOU CAN FIND MORE INFORMATION		21
DOCUMENTS INCORPORATED BY REFERENCE		22

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ABOUT THIS PROSPECTUS

This prospectus is part of a registration statement that Exelon, ComEd and Pepco have each filed with the Securities and Exchange Commission (SEC) using a “shelf” registration process. Under this shelf registration process, each of us may, from time to time, sell our Securities described in this prospectus in one or more offerings. Each time Exelon, ComEd and Pepco (each, a registrant) sells Securities, the registrant will provide a prospectus supplement that will contain a description of the Securities the registrant will offer and specific information about the terms of the offering. The prospectus supplement may also add, update or change information contained in this prospectus. If there is any inconsistency between the information in this prospectus and the prospectus supplement, you should rely on the prospectus supplement. You should read both this prospectus and any prospectus supplement together with additional information described under “Where You Can Find More Information.”

Information contained herein relating to each registrant is filed separately by such registrant on its own behalf. No registrant makes any representation as to information relating to any other registrant or Securities issued by any other registrant.

As used in this prospectus, the terms “we,” “our” and “us” generally refer to:

•

Exelon with respect to Securities issued by Exelon.

•

ComEd with respect to Securities issued by ComEd.

•

Pepco with respect to Securities issued by Pepco.

None of the registrants will guarantee or provide other credit or funding support for the Securities to be offered by another registrant pursuant to this prospectus.

We are not offering the Securities in any state where the offer is not permitted.

For more detailed information about the Securities, you should read the exhibits to the registration statement. Those exhibits have either been filed with the registration statement or incorporated by reference to earlier SEC filings listed in the registration statement.

You should rely only on information contained in this prospectus and which is incorporated by reference or the documents to which we have referred you. We have not authorized anyone to provide you with information that is different. This prospectus and related prospectus supplement may be used only where it is legal to sell these securities. The information in this prospectus and any prospectus supplement may only be accurate on the date of this document. The business of the registrant, financial condition, results of operations and prospects may have changed since that date.

Please see “Risk Factors” beginning on page 2 for a discussion of factors you should consider in connection with a purchase of the Securities offered in this prospectus.

FORWARD-LOOKING STATEMENTS

This prospectus and the documents incorporated or deemed incorporated by reference as described under the heading “Where You Can Find More Information” contain forward-looking statements that are not based entirely on historical facts and are subject to risks and uncertainties. Words such as “believes,” “anticipates,” “expects,” “intends,” “plans,” “predicts” and “estimates” and similar expressions are intended to identify forward-looking statements but are not the only means to identify those statements. These forward- looking statements are based on assumptions, expectations and assessments made by our management in light of their experience and their perception of historical trends, current conditions, expected future developments and other factors they believe to be appropriate. Any forward-looking statements are not guarantees of our future performance and are subject to risks and uncertainties.

This prospectus contains certain forward-looking statements within the meaning of federal securities laws, which are subject to risks and uncertainties. The factors that could cause actual results to differ materially from the forward-looking statements made by Exelon, ComEd and Pepco include those factors discussed herein, as well as the items discussed in (1) the registrants’ 2023 Annual Report on Form 10-K in (a) Part I, ITEM 1A. Risk Factors, (b) Part II, ITEM 7. Management’s Discussion and Analysis of Financial

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Condition and Results of Operations, and (c) Part II, ITEM 8. Financial Statements and Supplementary Data: Note 18, Commitments and Contingencies and (2) other factors discussed in filings with the Securities and Exchange Commission by the registrants.

You are cautioned not to place undue reliance on these forward-looking statements, which apply only as of the date on the front of this prospectus or, as the case may be, as of the date on which we make any subsequent forward-looking statement that is deemed incorporated by reference. We do not undertake any obligation to update or revise any forward-looking statement to reflect events or circumstances after the date as of which any such forward-looking statement is made.

RISK FACTORS

Investing in the Securities involves various risks. You are urged to read and consider the risk factors described in (a) the combined Annual Report on Form 10-K of Exelon, ComEd and Pepco for the year ended December 31, 2023, filed with the SEC on February 21, 2024. Before making an investment decision, you should carefully consider these risks as well as other information we include or incorporate by reference in this prospectus. The prospectus supplement applicable to each type or series of Securities offered by one of the registrants will contain a discussion of additional risks applicable to an investment in such registrant and the particular type of Securities the registrant is offering under that prospectus supplement.

EXELON CORPORATION

Exelon, incorporated in Pennsylvania in February 1999, is a utility services holding company engaged through ComEd, PECO Energy Company, Baltimore Gas and Electric Company, Pepco, Delmarva Power & Light Company and Atlantic City Electric Company, in the energy distribution and transmission businesses. Exelon’s principal executive offices are located at 10 South Dearborn Street, Chicago, Illinois 60603, and its telephone number is 800-483-3220.

COMMONWEALTH EDISON COMPANY

ComEd’s energy delivery business consists of the purchase and regulated retail sale of electricity and the transmission and distribution of electricity to retail customers in northern Illinois, including the City of Chicago.

ComEd was organized in the State of Illinois in 1913 as a result of the merger of Cosmopolitan Electric Company into the original corporation named Commonwealth Edison Company, which was incorporated in 1907. ComEd’s principal executive offices are located at 10 South Dearborn Street, Chicago, Illinois 60603, and its telephone number is 312-394-4321.

POTOMAC ELECTRIC POWER COMPANY

Pepco was incorporated in the District of Columbia in 1896 and Virginia in 1949. Pepco’s principal executive offices are located at 701 Ninth Street, N.W., Washington, D.C. 20068, and its telephone number is (202) 872-2000.

USE OF PROCEEDS

Except as otherwise indicated in the applicable prospectus supplement, each registrant expects to use the net proceeds from the sale of the Securities for general corporate purposes, including to discharge or refund (by redemption, by purchase on the open market, by purchase in private transactions, by tender offer or otherwise) outstanding long-term debt. Each registrant will describe in the applicable prospectus supplement any specific allocation of the proceeds to a particular purpose that the registrant has made at the date of that prospectus supplement. Please refer to our annual and quarterly reports incorporated by reference into this prospectus and any prospectus supplement for information concerning each registrant’s outstanding long-term debt. See “Where You Can Find More Information.

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DESCRIPTION OF SECURITIES

EXELON DEBT SECURITIES

The Exelon debt securities will be our direct, unsecured obligations and may be issued from time to time in one or more offerings of one or more series. The debt securities will be issued under an Indenture between us and The Bank of New York Mellon Trust Company, N.A. (the “Trustee”), dated June 11, 2015 (“Indenture”). The Indenture has been filed as exhibit to the registration statement of which this prospectus is a part. Selected provisions of the Indenture have been summarized below. The summary is not complete and many of the terms contained in the following summary may be modified in the accompanying prospectus supplement. You should read the Indenture for provisions that may be important to you.

Ranking

The debt securities will be Exelon’s direct unsecured general obligations and will rank equally with all of our existing and future unsecured and unsubordinated debt, will be senior in right of payment to all of our existing and future subordinated debt and will be junior to any of our future secured debt to the extent of the value of the collateral securing such secured debt. Because we are a holding company with no material assets other than our ownership interests in our subsidiaries and all of our operations are conducted by our subsidiaries, our debt is effectively subordinated to all existing and future debt, trade creditors, and other liabilities of our subsidiaries. Our rights, and hence the rights of our creditors, to participate in any distribution of assets of any subsidiary upon its liquidation or reorganization or otherwise would be subject to the prior claims of that subsidiary’s creditors, except to the extent that our claims as a creditor of such subsidiary may be recognized. The Indenture does not restrict our or our subsidiaries’ ability to incur additional indebtedness.

Events of Default

An “Event of Default” with respect to a series of debt securities issued under the Indenture means any of the following:

•

we fail to pay the principal of (or premium, if any, on) any debt security of that series when due and payable;

•

we fail to pay any interest on any debt security of that series for 30 days after such is due;

•

we fail to observe or perform any other covenants or agreements set forth in the debt securities of that series, or in the Indenture in regard to such debt securities, continuously for 90 days after notice (which must be sent either by the Trustee or holders of at least 33% of the principal amount of the affected series);

•

our failure to pay principal at maturity or acceleration following a default in an aggregate amount of $100 million or more with respect to any Indebtedness (as defined below) of Exelon Corporation (not including Indebtedness of our subsidiaries), or the acceleration of any of our Indebtedness aggregating $100 million or more which default is not cured, waived or postponed pursuant to an agreement with the holders of the Indebtedness within 30 days after written notice as provided in the Indenture, or the acceleration is not rescinded or annulled within 30 days after written notice as provided in the Indenture; or

•

we file for bankruptcy or certain other events of bankruptcy, insolvency or reorganization occur.

As used in the immediately preceding paragraph, “Indebtedness” means all obligations for borrowed money.

An Event of Default for a particular series of debt securities does not necessarily mean that an Event of Default has occurred for any other series of debt securities issued under the Indenture. If an Event of Default has occurred and has not been cured, the Trustee or the holders of not less than 33% of the principal amount of the debt securities of the affected series may declare the entire principal of the debt securities of such series due and payable immediately. Subject to certain conditions, if we deposit with the Trustee enough

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money to remedy the default and there is no default continuing, this acceleration of payment may be rescinded by the holders of at least a majority in aggregate principal amount of the debt securities of such series.

The Trustee must, within 90 days after a default occurs, notify the holders of the debt securities of the series of the default if we have not remedied it (default is defined to include the events specified above without the grace periods or notice). The Trustee may withhold notice to the holders of such debt securities of any default (except in the payment of principal or interest) if it in good faith considers such withholding in the interest of the holders. We are required to file an annual certificate with the Trustee, signed by an officer, stating any default by us under any provisions of the Indenture.

Prior to any declaration of acceleration of maturity, the holders holding a majority of the principal amount of the debt securities of the particular series affected, on behalf of the holders of all debt securities of that series, may waive any past default or Event of Default. We cannot, however, obtain a waiver of a payment default.

Other than the duty to act with the required standard of care during an event of default, the Trustee is not required to take any action under the Indenture at the request of any holders unless such holders offer the Trustee reasonable indemnity. Subject to the provisions for indemnification and certain other limitations, the holders of a majority in principal amount of the debt securities of any series may direct the time, method and place of conducting any proceedings for any remedy available to the Trustee with respect to such debt securities.

In order to bypass the Trustee and take steps to enforce your rights or protect your interests relating to the debt securities, the following must occur:

•

you must give the Trustee written notice that an Event of Default has occurred and remains uncured;

•

the holders of 33% of the principal amount of all outstanding debt securities of the relevant series must make a written request that the Trustee take action because of the default, and must offer reasonable indemnity to the Trustee against the cost and other liabilities of taking that action; and

•

the Trustee must have not taken action for 60 days after receipt of the above notice and offer of indemnity.

However, you are entitled at any time to bring a lawsuit for the payment of money due on your debt security on or after its due date.

“Street name” and other indirect holders should consult their banks or brokers for information on how to give notice or direction to, or make a request of, the Trustee and to make or cancel a declaration of acceleration.

Supplemental Indentures

There are three types of changes we can make to the Indenture and the debt securities issued thereunder.

Changes Requiring Each Holder’s Approval

The following changes require the approval of each holder of debt securities of the series affected then outstanding:

•

extending the fixed maturity of any debt security;

•

reducing the interest rate or extending the time of payment of interest;

•

reducing any premium payable upon redemption;

•

reducing the principal amount;

•

reducing the amount of principal payable upon acceleration of the maturity of a discounted debt security following default;

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•

changing the currency of payment on a debt security; or

•

reducing the percentage of securityholders whose consent is required to modify or amend the Indenture.

Changes Not Requiring Holder Approval

Changes not requiring holder approval are limited to those changes specified in the Indenture, including those which are of an administrative nature or are changes that would not adversely affect holders of the debt securities.

Changes Requiring a Majority of all Holders to Approve

A vote in favor by securityholders owning a majority of the principal amount of the debt securities of a particular series of affected debt securities is required for any other matter listed in the Indenture.

Consolidation, Merger or Sale

We may not merge or consolidate with any person (as defined in the Indenture) or sell substantially all of our assets as an entirety unless:

•

we are the continuing corporation or the successor person is organized under the laws of the United States or a state or is organized under the laws of a foreign jurisdiction and consents to the jurisdiction of the courts of the United States or a state and expressly assumes the payment of principal, and premium, if any, and interest on the debt securities and the performance and observance of all the covenants and conditions of the Indenture binding on us; and

•

we, or the successor person, are not immediately after the merger, consolidation or sale in default in the performance of a covenant or condition in the Indenture binding on us.

Discharge, Defeasance and Covenant Defeasance

We may discharge certain obligations to holders of the debt securities of a series that have not already been delivered to the Trustee for cancellation and that either have become due and payable or will become due and payable within one year (or scheduled for redemption within one year) by irrevocably depositing with the Trustee, in trust, funds in U.S. dollars in an amount sufficient to pay the entire indebtedness including, but not limited to, the principal and premium, if any, and interest to the date of such deposit (if the debt securities have become due and payable) or to the maturity thereof or the redemption date of the debt securities of that series, as the case may be. We may direct the Trustee to invest such funds in U.S. Treasury securities with a maturity of one year or less or in a money market fund that invests solely in short-term U.S. Treasury securities.

The Indenture provides that we may elect either (1) to defease and be discharged from any and all obligations with respect to the debt securities of a series (except for, among other things, obligations to maintain an office or agency with respect to the debt securities and to hold moneys for payment in trust) (“legal defeasance”) or (2) to be released from our obligations to comply with the restrictive covenants under the Indenture, and any omission to comply with such obligations will not constitute a default or an event of default with respect to the debt securities of a series and such related clause under “— Events of Default” will no longer be applied (“covenant defeasance”). Legal defeasance or covenant defeasance, as the case may be, will be conditioned upon, among other things, the irrevocable deposit by us with the Trustee, in trust, of an amount in U.S. dollars, or U.S. government obligations, or both, applicable to the debt securities of that series which through the scheduled payment of principal and interest in accordance with their terms will provide money in an amount sufficient to pay the principal or premium, if any, and interest on the debt securities on the scheduled due dates therefor.

If we effect covenant defeasance with respect to the debt securities of any series, the amount in U.S. dollars, or U.S. government obligations, or both, on deposit with the Trustee will be sufficient, in the opinion of a nationally recognized firm of independent accountants, to pay amounts due on the debt securities of that series at the time of the stated maturity but may not be sufficient to pay amounts due on the debt

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securities of that series at the time of the acceleration resulting from such event of default. However, we would remain liable to make payment of such amounts due at the time of acceleration.

We will be required to deliver to the Trustee an opinion of counsel that the deposit and related defeasance will not cause the holders and beneficial owners of the debt securities of that series to recognize income, gain or loss for federal income tax purposes. If we elect legal defeasance, that opinion of counsel must be based upon a ruling from the U.S. Internal Revenue Service or a change in law to that effect.

We may exercise our legal defeasance option notwithstanding our prior exercise of our covenant defeasance option.

Governing Law

The Indenture is governed by the laws of the State of New York.

EXELON COMMON STOCK

The description below is a summary of certain provisions of our common stock. The Pennsylvania Business Corporation Law and our Amended and Restated Articles of Incorporation and Bylaws determine the rights and privileges of holders of our common stock. We encourage you to read such documents, which have been filed with the SEC and are incorporated herein by reference, and the Pennsylvania law for more information regarding such common stock.

General

Our authorized capital stock consists of 2,000,000,000 shares of common stock, without par value per share. Our common stock is listed on NASDAQ and the Chicago Stock Exchange under the trading symbol “EXC.”

Dividends

Dividends on the common stock will be paid if, when and as determined by our Board of Directors out of funds legally available for this purpose. The rate and timing of future dividends will depend upon our future earnings and financial condition and upon other relevant factors affecting our dividend policy, which we cannot presently determine. As a practical matter, our ability to pay dividends will be governed by the ability of our operating subsidiaries to pay dividends to us.

Voting Rights

Holders of common stock are entitled to one vote for each share held of record by them on all matters presented to shareholders. Pursuant to our Amended and Restated Articles of Incorporation, the holders of common stock do not have cumulative voting rights in the election of directors. Our directors are not classified in respect to the time for which they may hold office. The directors are elected at each annual meeting of shareholders for a one year term expiring at the next annual meeting of shareholders. Our Bylaws also provide for certain notice requirements for shareholder nominations and proposals at annual meetings and preclude shareholders from bringing business before any special meeting. Our Amended and Restated Articles of Incorporation and certain provisions of Pennsylvania law require a supermajority vote of holders or a majority vote of disinterested directors to approve certain business combinations and other major transactions involving us.

Liquidation Rights

After satisfaction of the preferential liquidation rights of any preferred stock, the holders of our common stock are entitled to share, ratably, in the distribution of all remaining net assets.

Preemptive and Other Rights

The holders of our common stock do not have preemptive rights as to additional issues of common stock or conversion rights. The shares of our common stock are not subject to redemption or to any further calls or assessments and are not entitled to the benefit of any sinking fund provisions.

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Listing

The outstanding shares of our common stock are, and the shares offered hereby will be, listed on NASDAQ and the Chicago Stock Exchange.

Transfer Agent and Registrar

The Transfer Agent and Registrar for our common stock is Equiniti Trust Company.

EXELON STOCK PURCHASE CONTRACTS AND STOCK PURCHASE UNITS

We may issue stock purchase contracts representing contracts obligating holders to purchase from us, and us to sell to the holders, a specified number of shares of our common stock (or a range of numbers of shares pursuant to a predetermined formula) at a future date or dates. The price per share of common stock and the number of shares of common stock may be fixed at the time the stock purchase contracts are issued or may be determined by reference to a specific formula set forth in the stock purchase contracts.

The stock purchase contracts may be issued separately or as a part of units, often known as stock purchase units, consisting of a stock purchase contract and either:

•

our debt securities; or

•

debt obligations of third parties, including U.S. Treasury securities,

securing the holders’ obligations to purchase the common stock under the stock purchase contracts.

The stock purchase contracts may require us to make periodic payments to the holders of the stock purchase units or vice versa, and such payments may be unsecured or prefunded on some basis. The stock purchase contracts may require holders to secure their obligations in a specified manner and in certain circumstances we may deliver newly issued prepaid stock purchase contracts, often known as prepaid securities, upon release to a holder of any collateral securing such holder’s obligations under the original stock purchase contract.

The applicable prospectus supplement will describe the terms of any stock purchase contracts or stock purchase units and, if applicable, prepaid securities. The description in the applicable prospectus supplement will not contain all of the information that you may find useful. For more information, you should review the stock purchase contracts, the collateral arrangements and depositary arrangements, if applicable, relating to such stock purchase contracts or stock purchase units and, if applicable, the prepaid securities and the document pursuant to which the prepaid securities will be issued. These documents will be filed with the SEC promptly after the offering of the stock purchase contracts or stock purchase units. Material United States federal income tax considerations applicable to the stock purchase contracts and the stock purchase units will also be discussed in the applicable prospectus supplement.

EXELON PREFERRED STOCK

General

Exelon’s authorized capital stock includes 100,000,000 shares of preferred stock, no par value. There are no shares of preferred stock outstanding.

Our Board of Directors is authorized, without further shareholder action, to divide the preferred stock into one or more series and to determine the following designations, preferences, limitations and special rights of any series (which for any series will be set forth in the related prospectus supplement):

•

the annual dividend rate or rates;

•

the rights, if any, of the holders of shares of the series upon voluntary or involuntary liquidation, dissolution or winding up of our company;

•

the terms and conditions upon which shares may be converted into shares of other series or other capital stock, if issued with the privilege of conversion;

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•

the price at and the terms and conditions upon which shares may be redeemed;

•

the terms and amount of any sinking fund for the purchase or redemption of shares of a series; and

•

the exchange or exchanges on which the preferred stock will be listed, if any.

Dividend Rights

The annual dividend rate for each new series of preferred stock and whether such dividends will be cumulative from the date of issuance will be set forth in the applicable prospectus supplement. Dividends will be payable, when declared, quarterly on the first day of February, May, August and November. Any limitations on our rights to pay dividends will be described in the applicable prospectus supplement.

Voting Rights

The voting rights for each new series of preferred stock will be set forth in the applicable prospectus supplement.

Liquidation Rights

The amount per share payable on each series of preferred stock in the event of any voluntary or involuntary liquidation will be set forth in the applicable prospectus supplement.

Redemption Provisions

The redemption provisions, if any, with respect to each series of preferred stock will be set forth in the applicable prospectus supplement.

Sinking Fund

The sinking fund provisions, if any, with respect to each series of preferred stock will be set forth in the applicable prospectus supplement.

Miscellaneous

Holders of our preferred stock will not have any preemptive rights to subscribe for or purchase any additional shares of our capital stock, or other securities or other right or option to purchase shares of capital stock. The new preferred stock, when issued and paid for, will be fully paid and nonassessable.

There is no provision restricting us from purchasing shares of preferred stock in the event of an arrearage in the payment of dividends or sinking fund obligations.

Listing

The prospectus supplement will indicate whether and where the preferred stock to be issued will be listed.

COMED BONDS

The ComEd debt securities will be first mortgage bonds (“bonds”) that will be issued under ComEd’s Mortgage dated July 1, 1923, as amended and supplemented and as further supplemented by a supplemental indenture creating the Bonds. The bonds will bear interest at the rates per annum and will be due and payable on the dates set forth in the applicable prospectus supplement.

We refer to the ComEd Mortgage in this prospectus as the “Mortgage” and to The Bank of New York Mellon Trust Company, N.A. as the “Mortgage Trustee.” The terms “lien of Mortgage,” “mortgage date of acquisition,” “permitted lien,” “prior lien,” “prior lien bonds,” “property additions,” and “utilized under the Mortgage” are used in this prospectus with the meanings given to those terms in the Mortgage.

The Mortgage contains provisions under which substantially all of the properties of ComEd’s electric utility subsidiary, Commonwealth Edison Company of Indiana, Inc., or the Indiana Company, might be

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subjected to the lien of the Mortgage, if we should so determine, as additional security for our bonds, whereupon that subsidiary would become a “mortgaged subsidiary,” as defined in the Mortgage. Since we have not as yet made any determination as to causing the Indiana Company to become a mortgaged subsidiary, those provisions of the Mortgage that are summarized below that discuss a mortgaged subsidiary as well as us, relate to ComEd only.

We have summarized selected provisions of the Mortgage below. However, because this summary is not complete, it is subject to and is qualified in its entirety by reference to the Mortgage. We suggest that you read the complete text of the ComEd Mortgage, a copy of which we have incorporated by reference as an exhibit to the registration statement of which this prospectus is a part.

Securities Offered

The bonds will be secured equally with all other bonds outstanding or hereafter issued under our Mortgage.

Security

The Mortgage is a first mortgage lien on substantially all property and franchises currently owned by ComEd. Our transmission and distribution assets are the principal properties subject to the lien of the Mortgage. In addition, any property and franchises hereafter acquired by us will also become subject to the lien of the Mortgage. The lien of the mortgage does not attach to expressly excepted property, as described in the next paragraph, and property which may be acquired by us subsequent to the filing of a bankruptcy proceeding with respect to us under the Bankruptcy Reform Act of 1978. The lien is also subject to permitted liens, as described below, and, in the case of after-acquired property, liens, if any, existing or placed on that property at the time of acquisition thereof.

There are expressly excepted from the lien of our Mortgage, whether now owned or hereafter acquired, certain real estate not used in the public utility business, real estate held by us in the name of a nominee, cash and securities not specifically pledged under the Mortgage, receivables, contracts (other than leases), materials and supplies not included in utility plant accounts, merchandise, automobiles, trucks and other transportation equipment and office furniture and equipment.

We have agreed under the Mortgage to hold legal title to the mortgaged property free and clear of all liens other than permitted liens, as defined in the Mortgage. Permitted liens are generally liens or restrictions that do not materially interfere with our use of the mortgaged property for the conduct of our business. Permitted liens include liens for real estate taxes, assessments and governmental charges that are not delinquent or are being contested in good faith; liens for judgments that are being appealed or whose enforcement has been stayed; rights reserved to or vested in municipalities or public authorities under franchises, grants, licenses or permits held by us; leases; easements, reservations, exceptions, conditions, limitations and restrictions affecting the mortgaged property which do not materially interfere with our use of the mortgaged property; zoning laws and ordinances; and inconsequential defects or irregularities in title that, in the opinion of our counsel, may be properly disregarded. In the event that the Mortgage lien on a particular piece of mortgaged property were to be foreclosed, such property would remain subject to liens for taxes on that property. Other liens on that property, to the extent prior to the lien of the Mortgage and representing monetary obligations, would be entitled to payment from the foreclosure sale proceeds prior to any sums being paid to the holders of the bonds.

The bonds will rank equally with all bonds, irrespective of series, now or hereafter outstanding under our Mortgage.

Acquisitions of Property Subject to Prior Liens

We covenant in the Mortgage that we will not acquire any property subject to a prior lien (other than a permitted lien):

•

if the principal amount of prior lien bonds outstanding thereunder and under other prior liens upon such prior lien property exceeds 662∕3% of the fair value of such part of such property as shall consist of property of the character of property additions; and

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•

unless the net earnings of such property for any twelve-month period within the immediately preceding fifteen-month period shall have been at least two and one-half times the annual interest on all prior lien bonds secured by prior liens on such property.

We also covenant that we will not transfer all or substantially all of our property to any other corporation, the property of which is subject to a prior lien, unless the property of such other corporation could be acquired by us under the provisions of such covenant with respect to the acquisition of property subject to a prior lien.

We covenant in the Mortgage that we will not issue additional prior lien bonds under any prior lien, and that as soon as all prior lien bonds shall cease to be outstanding under any prior lien, we will promptly procure or cause to be procured the cancellation and discharge of that prior lien. We further covenant that upon the discharge of a prior lien we will cause any cash on deposit with the prior lien trustee (other than cash deposited for the payment or redemption of outstanding prior lien bonds) to be deposited with the Mortgage Trustee, except to the extent required to be deposited with the trustee under another prior lien.

Release of Property from Mortgage

Provided that we are not in default under the Mortgage, the Mortgage allows us to release property from the lien of the Mortgage in connection with its sale or other disposition. Under these provisions, we may obtain the release of mortgaged property by:

•

delivering to the Mortgage Trustee specified certificates describing the property to be sold or disposed and the consideration to be received and stating its fair value;

•

delivering an opinion of counsel as to compliance with the provisions of the Mortgage governing such release; and

•

depositing cash with the Mortgage Trustee in an amount equal to the fair value of the property to be released, subject to reduction or elimination as hereinafter described.

“Fair value” is defined as the fair value to us of the property in question. Fair value is determined by one of our engineers; however, a determination by an independent engineer is also required if the fair value of the property in question exceeds 1% or more of the outstanding principal amount of the bonds under the Mortgage. The required cash deposit may be reduced, or eliminated entirely, by utilizing net property additions or bondable bond retirements not previously utilized under the Mortgage.

We have used these provisions from time to time to release substantial amounts of property from the lien of the Mortgage. In December 1999, we obtained the release of our fossil generation assets in connection with their sale to a third party. In January 2001, we obtained the release of, among other things, our nuclear generation assets in connection with their transfer to our affiliate, Generation, as part of the restructuring undertaken by Exelon. In both cases, the releases were accomplished without the deposit of cash due to the availability of sufficient amounts of unutilized bondable bond retirements and net property additions.

Issuance of Additional Bonds

The Mortgage provides that no bonds may be issued which, as to security, will rank ahead of the bonds that may be sold pursuant to this prospectus but, as indicated below, we may, subject to certain limitations, acquire property subject to prior liens. Nonetheless, subject to the limitations discussed below, we may issue additional bonds under the Mortgage with the same priority as the bonds that may be sold pursuant to this prospectus, including bonds having the same series designation and terms as the bonds that may be sold pursuant to this prospectus, without the approval of the holders of outstanding bonds under the Mortgage, including the holders of any outstanding bonds issued pursuant to this prospectus.

The aggregate principal amount of other bonds that may be issued under the Mortgage and that, as to security, will rank equally with the bonds that may be sold pursuant to this prospectus is not limited except as indicated below. Additional bonds of any series may be issued, subject to the provisions of the Mortgage, in principal amount equal to:

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•

662∕3% of net property additions not previously utilized under the Mortgage;

•

the amount of cash deposited with the Mortgage Trustee as the basis for the issuance of those bonds; and

•

the amount of bondable bond retirements not previously utilized under the Mortgage;

provided, however, that no bonds may be issued on the basis of net property additions or deposited cash, or on the basis of bondable bond retirements if the bonds to be issued bear a higher rate of interest than that borne by the bonds retired or being retired (except when the bonds retired or being retired mature within two years), unless our net earnings for any twelve-month period within the immediately preceding fifteen-month period shall have been equal to at least two and one-half times the annual interest on all bonds then outstanding under the Mortgage, including the bonds then proposed to be issued but not including any bonds then being retired.

The Mortgage provides that cash deposited with the Mortgage Trustee as a basis for the issuance of bonds shall be:

•

paid over to us in an amount, certified to the Mortgage Trustee, equal to 662∕3% of the amount of net property additions not previously utilized under the Mortgage, or in an amount equal to the amount of bondable bond retirements not previously utilized under the Mortgage, or both, or

•

applied to the purchase or redemption of bonds.

“Net earnings” means our earnings as defined in the Mortgage after deducting all charges except:

•

charges for the amortization, write-down or write-off of acquisition adjustments or intangibles;

•

property losses charged to operations;

•

provisions of income and excess or other profits taxes imposed on income after the deduction of interest charges, or charges made in lieu of those taxes;

•

interest charges; and

•

amortization of debt and stock discount and expense or premium.

Any net profit or net loss from merchandising and jobbing is to be deducted from operating expenses or added to operating expenses, as the case may be.

Net nonoperating income from property and securities not subject to the lien of the Mortgage may be included in revenues but only to the extent of not more than 10% of the total of such net earnings. No profits or losses on the disposition of property or securities or on the reacquisition of securities shall be included in net earnings. The net earnings calculation under the Mortgage is not affected by certain accounting write-offs related to plant costs.

Except as set forth above, the Mortgage does not limit the amount of additional bonds which can be issued and it does not contain any restrictions on the issuance of unsecured indebtedness. In addition, the Mortgage does not prohibit a merger or sale of substantially all of our assets or a comparable transaction, unless the lien of the Mortgage is impaired, and does not address the effect on bondholders of a highly leveraged transaction.

Property Additions/Bondable Bond Retirements

“Bondable bond retirements” means an amount equal to the principal amount of bonds retired by application of funds deposited with the Mortgage Trustee for cancellation, whether or not such deposit of funds or surrender of bonds is pursuant to a sinking fund or purchase fund.

“Net property additions” means the amount of $50,000,000, plus the cost or fair market value as of the mortgage date of acquisition thereof, whichever is less, of property additions, less all “current provisions for depreciation” made by us after December 1, 1944, after deducting from those current provisions for depreciation the amount of the “renewal fund requirement,” if any, for the year 1945 and subsequent years.

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“Current provisions for depreciation” for any period means the greater of:

•

the total of the amounts appropriated by us for depreciation during that period on all property of the character of property additions not subject to a prior lien, increased or decreased, as the case may be, by net salvage value for that period, such amounts not to include, however, provisions for depreciation charged to surplus, charges to income or surplus for the amortization, write-down or write-off of acquisition adjustments or intangibles, property losses charged to operations or surplus, or charges to income in lieu of income and excess or other profits taxes; and

•

an amount equal to one-twelfth of 2% for each calendar month of that period (or such lesser percentage, as may, at stated intervals, be certified by an independent engineer as adequate) of the original cost, as of the beginning of that month, of all depreciable property of the character of property additions not subject to a prior lien.

Renewal Fund Requirement

We covenant in the Mortgage that we will pay or cause to be paid to the Mortgage Trustee each year an amount of cash equal to the excess, if any, of current provisions for depreciation for that year over the cost or fair market value as of the mortgage date of acquisition thereof, whichever is less, of property additions for that year. That excess amount, which constitutes the renewal fund requirement for that year, is subject to reduction by an amount equal to the amount, certified to the Mortgage Trustee, of net property additions or bondable bond retirements, or both, not previously utilized under the Mortgage. There was no renewal fund requirement for any of the years 1945 through 2011, except as noted in the following table. Any renewal fund requirement was satisfied by certifying an equivalent amount of property additions, except as indicated in the table.

Renewal Fund Requirement
Year	Amount (in millions)			Year	Amount (in millions)			Year	Amount (in millions)
1989		$	140.7	1994		$	193.6	2004		$	270.7
1990			1.0	1995			15.0*
1993			50.9	1996			139.9*

Satisfied by certifying an equivalent amount of bondable bond retirements.

Modification of Mortgage

In general, modifications or alterations of the Mortgage and of the rights and obligations of us and of the bondholders, and waivers of compliance with the Mortgage, may, with our approval, be made at a meeting of bondholders upon the affirmative vote of bondholders owning 80% of the principal amount of the bonds entitled to vote at the meeting with respect to the matter involved, but no such modifications or alterations or waivers of compliance shall be made which will permit the extension of time or times of payment of the principal of or the interest or the premium, if any, on any bonds or the reduction in the principal amount thereof or in the rate of interest or the amount of any premium thereon, or any other modification in the terms of such principal, interest or premium, which terms of payment are unconditional, or, otherwise than as permitted by the Mortgage, the creation of any lien ranking prior to or on a parity with the lien of the Mortgage with respect to any of the mortgaged property, all as more fully provided in the Mortgage.

Concerning the Mortgage Trustee

An affiliate of the Mortgage Trustee provides general banking services, including those as a depository, for us and certain of our affiliates. The affiliate is also one of the lenders under credit agreements with us and our affiliates.

Rights Upon Default

The Mortgage provides that in case any one or more of certain specified events (defined as “completed defaults”) shall occur and be continuing, the Mortgage Trustee or the holders of not less than 25% in principal

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amount of the bonds may declare the principal of all bonds, if not already due, together with all accrued and unpaid interest thereon, to be immediately due and payable. The Mortgage Trustee, upon request of the holders of a majority in principal amount of the outstanding bonds, shall waive such default and rescind any such declaration if such default is cured.

The Mortgage further provides that upon the occurrence of one or more completed defaults, the Mortgage Trustee may proceed by such suits of law or in equity to foreclose the lien of the Mortgage or to enforce any other appropriate remedy as the Mortgage Trustee, being advised by counsel, shall determine.

Holders of bonds have no right to enforce any remedy under the Mortgage unless the Mortgage Trustee have first had a reasonable opportunity to do so following notice of default to the Mortgage Trustee and request by the holders of not less than 25% in principal amount of the bonds for action by the Mortgage Trustee with offer of indemnity satisfactory to the Mortgage Trustee against costs, expenses and liabilities that may be incurred thereby, but such provision does not impair the absolute right of any bondholder to enforce payment of the principal of and interest on such bondholder’s bonds when due.

Default and Notice Thereof to Bondholders

The Mortgage provides that the following shall constitute completed defaults:

•

default shall be made by us in the payment of any installment of interest on any of the bonds when due and such default shall continue for 60 days;

•

default shall be made by us in the payment of the principal of any of the bonds when due, whether at maturity or by declaration or otherwise;

•

default shall be made by us in the payment of any installment of interest on any prior lien bonds when due, and such default shall continue for 30 days after written notice given to us (following the expiration of the period of grace, if any, specified in the prior lien securing such prior lien bonds) by the Mortgage Trustee or to us and the Mortgage Trustee by the holders of not less than 5% in principal amount of the bonds;

•

default shall be made by us in the payment of the principal of any prior lien bonds when due, whether at maturity or by declaration or otherwise, and such default shall continue for 30 days after written notice to us by the Mortgage Trustee or to us and the Mortgage Trustee by the holders of not less than 5% in principal of the bonds;

•

bankruptcy, receivership or similar proceedings shall be initiated by us, or any judgment entered in such proceedings initiated against us shall not have been vacated, set aside or stayed within 45 days after the entry thereof; and

•

default shall be made in the observance or performance of any other of our covenants, conditions or agreements contained in the Mortgage or in the bonds or in any prior lien or prior lien bonds, and such default shall continue for 90 days after written notice to us and the Mortgage Trustee by the holders of not less than 25% in principal amount of the bonds.

Within 90 days after the occurrence of any default which is known to the Mortgage Trustee, the Mortgage Trustee shall give to the bondholders notice of such default unless it shall have been cured; except, in case of defaults in the payment of principal of or interest on the bonds, or in the payment of any sinking fund or purchase fund installment, if the Mortgage Trustee shall in good faith determine that the withholding of such notice is in the interests of the bondholders.

Certificates and Opinions

Officers’ certificates evidencing compliance with the covenants in the Mortgage relating to the payment of taxes and the maintenance of insurance on our properties subject to the lien of the Mortgage must be filed as exhibits to our certificate filed annually with the Mortgage Trustee. In connection with the taking of various actions by the Mortgage Trustee and the Co-Trustee, or the Mortgage Trustee upon our application, including the authentication and delivery of additional bonds, the release of property, the reduction or withdrawal of cash and other matters, the Mortgage requires that we furnish to the Mortgage Trustee orders, requests, resolutions, certificates of the officers, engineers, accountants and appraisers, and opinions

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of counsel and other documents, the particular documents to be furnished in each case being dependent upon the nature of the application.

PEPCO FIRST MORTGAGE BONDS

The Pepco debt securities will be first mortgage bonds. The following description sets forth certain general terms and provisions of the first mortgage bonds that Pepco may offer pursuant to this prospectus, which we refer to as “new bonds.” The mortgage to be used in connection with each issuance of new bonds is filed as an exhibit to the registration statement.

General — New Bonds

The relevant prospectus supplement will describe the terms of the new bonds being offered, including:

(i)

the designation and aggregate principal amount of such new bonds;

(ii)

the date on which such new bonds will mature;

(iii)

the rate per annum at which such new bonds will bear interest, or the method of determining such rate;

(iv)

the dates on which such interest will be payable;

(v)

any redemption terms; and

(vi)

other specific terms applicable to the new bonds not inconsistent with the provisions of the mortgage.

Payment of Principal and Interest

We will pay principal, premium, if any, and interest on the new bonds in immediately available funds at the corporate trust office of The Bank of New York Mellon or at the office of any other paying agent that we may designate.

Registration and Transfer

We will issue the new bonds only in fully registered form without coupons. Unless the relevant prospectus supplement states otherwise, we will issue the new bonds in denominations of $1,000 or any integral multiple thereof.

So long as any first mortgage bonds remain outstanding, we must maintain an office or agency where holders can present or surrender the first mortgage bonds for payment or for transfer or exchange and where holders can serve notices and demands to or upon us. (Mortgage, Section 4, Article II; Section 4, Article IV) We have designated the corporate trust office of The Bank of New York in the City of New York Mellon as our agent for these purposes. We will not impose any charges for exchanges of the new bonds.

No Sinking Fund

Unless the relevant prospectus supplement states otherwise, there will be no improvement and sinking fund or any maintenance and replacement requirement or dividend restriction for the new bonds. There are no provisions of this type in the mortgage or in any supplemental indenture for any outstanding first mortgage bonds.

Highly Leveraged Transactions

The mortgage does not contain any covenants or other provisions that specifically are intended to afford holders of the new bonds special protection in the event of a highly leveraged transaction.

Security

The new bonds will be secured, together with all other first mortgage bonds now or hereafter issued under the mortgage, by a valid and direct first lien (subject to certain leases, permitted liens and other minor matters) on substantially all of our properties and franchises, other than the following:

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(i)

cash, accounts receivable and other liquid assets;

(ii)

securities (including securities evidencing investments in our subsidiaries);

(iii)

contracts, operating agreements and leases by us as lessor;

(iv)

equipment and materials not installed as part of our fixed property; and

(v)

electric energy and other materials, merchandise or supplies produced or purchased by us for sale, distribution or use in the ordinary course of business.

The lien of the mortgage also extends to after-acquired property (other than the types of property described above), including property acquired as a result of a merger or consolidation. However, after-acquired property may be subject to liens existing or placed thereon at the time of acquisition and, in certain circumstances, to liens attaching to such property prior to the recording and/or filing of an instrument specifically describing such property as being subject to the lien of the mortgage.

The mortgage trustee has a lien prior to the lien of holders of first mortgage bonds on the mortgaged property to secure the payment of its reasonable compensation and expenses. (Mortgage, Section 2, Article XIII)

Issuance of Additional First Mortgage Bonds

Subject to the limitation described in the following paragraph, we may issue additional first mortgage bonds ranking equally with the new bonds in an aggregate amount of up to:

(i)

60% of the net bondable value of property additions we have constructed or acquired after June 30, 1936 (except as described below), that (a) are not subject to a prior lien and (b) we have not already used as the basis for issuing first mortgage bonds, withdrawing cash or reducing the amount of cash required to be paid to the mortgage trustee;

(ii)

the amount of cash deposited with the mortgage trustee for such purpose (which we may thereafter withdraw on the same basis that additional first mortgage bonds are issuable under (i) and (iii), and if we do not withdraw it within three years, the cash must be used by the mortgage trustee to purchase or redeem outstanding first mortgage bonds); and

(iii)

the aggregate principal amount of previously issued first mortgage bonds that we have paid at maturity, redeemed or repurchased (other than with funds from the trust estate) and that we have not used as the basis for (a) the issuance of additional first mortgage bonds, (b) the withdrawal of cash from the trust estate or (c) the reduction of the amount of cash required to be paid to the mortgage trustee upon the release of property. In the mortgage these are called refundable bonds.

Property additions generally include property which is used or useful for the business of generating, transmitting or distributing electricity and is properly chargeable to fixed property accounts. The net bondable value of property additions is based on the cost or fair value to us (whichever is less) of new property, with deductions to adjust for, among other things, property retirements. So long as any new bonds are outstanding, property additions constructed or acquired on or before December 31, 1946 may not be made the basis for the issue of first mortgage bonds, or the withdrawal of cash, or the reduction of cash required to be paid to the mortgage trustee. (Mortgage, Article I; Sections 4, 6 and 7, Article III; Section 4, Article VIII); Section 2, Part IV, Supplemental Indenture)

We cannot issue additional first mortgage bonds unless our net earnings available for interest and property retirement appropriations (defined generally as earnings before depreciation, amortization, income taxes and interest charges) for any 12 consecutive calendar months during the immediately preceding 15 months have been at least twice the annual interest charges on all first mortgage bonds then outstanding and then being issued. However, this limitation does not apply if the first mortgage bonds are being issued on the basis of (i) first mortgage bonds paid at, or redeemed or purchased within two years prior to, maturity or (ii) under limited circumstances, certain property additions. (Mortgage, Sections 3, 4 and 7, Article III)

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If we acquire property that is subject to a lien prior to the lien of the mortgage, under certain circumstances we may incur additional indebtedness secured by that lien. (Mortgage, Section 16, Article IV)

Release of Property

We may obtain the release of property from the lien of the mortgage by depositing with the mortgage trustee cash, or purchase money obligations secured by the property released, in an aggregate amount at least equal to the fair value of the property to released. The mortgage permits us to reduce the amount required to be deposited by reducing the refundable bond balance by an equal amount and by reducing the amount of cash we could withdraw upon the basis of property additions, as described below. (Mortgage, Article VII; Sections 1 and 2, Article VIII)

The mortgage allows us to dispose of or abandon obsolete property and surrender or modify certain franchises and rights without any release by the mortgage trustee. (Mortgage, Section 2, Article VII)

Cash deposited to obtain a release of property may be used by the mortgage trustee, at our discretion, to redeem or repurchase first mortgage bonds. Upon such redemption or repurchase, we can request that the mortgage trustee release to us an additional amount of cash equal to two-thirds of the aggregate principal amount of the first mortgage bonds repurchased or redeemed. (Mortgage, Section 8, Article VII)

Withdrawal of Cash Deposited with Mortgage Trustee

We may withdraw cash deposited with the mortgage trustee to obtain the release of property in an amount equal to the cost (or, if less than cost, the fair value to us) of property additions purchased, constructed or otherwise acquired on or after the date of the application for the release of the property in respect of which the cash was deposited and by reducing the refundable bond balance by the amount of cash withdrawn. (Mortgage, Sections 1 and 2, Article VIII)

Consolidation, Merger, Transfer of Assets

Nothing in the mortgage or terms of the first mortgage bonds prevents us from

(i)

consolidating with another corporation,

(ii)

merging another corporation into us where we are the survivor,

(iii)

merging into another corporation where the other corporation is the survivor or

(iv)

selling or leasing our property as an entirety or substantially as an entirety, provided that

(a)

the transaction is permitted by law and is approved by all required governmental entities,

(b)

the terms of the transaction do not impair the lien and security of the mortgage on any part of the trust estate or the rights and powers of the mortgage trustee or the holders of first mortgage bonds,

(c)

if we consolidate, merge into another corporation, or sell our property as an entirety or substantially as an entirety, the surviving or acquiring corporation satisfies certain financial requirements and the successor corporation assumes by supplemental indenture all of our obligations under the mortgage and on the first mortgage bonds, and

(d)

if we lease our property as an entirety or substantially as an entirety, the lease is subject to immediate termination by the mortgage trustee if an event of default under the mortgage has happened and is continuing. (Mortgage, Section 1, Article XII)

If we consolidate with or merge into any other corporation, or sell our property as an entirety or substantially as an entirety, the mortgage will not (unless the successor corporation elects otherwise) be or become a lien upon any of the properties or franchises owned by the successor corporation at the time of such merger, consolidation, or sale, or acquired by it thereafter, except those properties acquired from us and additions, extensions, improvements, repairs and replacements to properties included in the trust estate under the mortgage prior to the merger, consolidation, or sale. (Mortgage, Section 3, Article XII)

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Modification

Modifications Without Consent

Without the consent of any holders of first mortgage bonds, we and the mortgage trustee may enter into one or more supplemental indentures for any of the following purposes:

(i)

to provide for creation of any series of first mortgage bonds in accordance with the terms of the mortgage;

(ii)

to evidence the assumption by any permitted successor of our covenants in the mortgage and on the first mortgage bonds;

(iii)

to close the mortgage against the issuance of additional first mortgage bonds or add to the restrictions imposed on the issuance of additional first mortgage bonds;

(iv)

to add to our covenants or to surrender any of our rights or powers under the mortgage;

(v)

to subject to the lien of the mortgage property that we may acquire and to amplify or correct the description of any property that is part of the trust estate;

(vi)

to make such provisions in regard to matters or questions arising under the mortgage as may be necessary or desirable and not inconsistent with the mortgage;

(vii)

to modify any provisions of the mortgage or relieve us from any obligations, conditions or restrictions in the mortgage; provided that no such modification will become effective or impair the rights of the holders of first mortgage bonds or the mortgage trustee while any first mortgage bonds that were issued prior to the execution of the supplemental indenture remain outstanding;

(viii)

to cure any ambiguity, or cure, correct or supplement any inconsistent or defective provision contained in mortgage or any supplemental indenture; and

(ix)

to modify, amend or add to the provisions of the mortgage so as to permit the qualification of the mortgage under the Trust Indenture Act. (Mortgage, Section 2, Article II; Sections 1 and 2, Article XII; Section 1, Article XIV)

Modifications Requiring Consent

The mortgage provides that with the consent of the holders of 60% in principal amount of outstanding first mortgage bonds and of 60% in principal amount of first mortgage bonds of each series affected if less than all are affected, the mortgage may be changed except to affect the terms of payment of the principal or interest on any first mortgage bonds or to reduce the percentage of bondholders required to effect any change. (Mortgage, Section 6, Article XV)

Events of Default

The term “event of default,” when used in the mortgage with respect to all first mortgage bonds issued thereunder, means any of the following:

(i)

Failure to pay principal on any first mortgage bond when due;

(ii)

Failure to pay interest on any first mortgage bond, or to satisfy any sinking fund obligation with respect to any first mortgage bond, within 30 days after such payment or obligation is due;

(iii)

Failure to perform any other covenant in the mortgage for a period of 60 days after we are given notice thereof by the mortgage trustee or the holders of 15% in principal amount of first mortgage bonds; and

(iv)

Events relating to our bankruptcy, insolvency or reorganization specified in the mortgage. (Mortgage, Section 1, Article IX)

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Remedies

Upon any event of default, the mortgage trustee in its discretion may, and upon the written request of the holders of at least 25% in principal amount of all outstanding first mortgage bonds the mortgage trustee shall, declare all outstanding first mortgage bonds immediately due and payable. Such declaration, however, is subject to the condition that, if before any sale of the trust estate all interest in arrears has been paid and all defaults have been cured, the holders of a majority of the outstanding principal amount of first mortgage bonds may waive such default and its consequences and rescind such declaration. (Mortgage, Section 1, Article IX)

If an event of default occurs and is continuing, the mortgage trustee in its discretion may, and upon the written request of the holders of at least 25% in principal amount of all outstanding first mortgage bonds and upon being indemnified to its satisfaction the mortgage trustee shall, enforce the lien of the mortgage by foreclosing on the trust estate. (Mortgage, Section 4, Article IX)

The holders of a majority in principal amount of first mortgage bonds may direct proceedings for the sale of the trust estate, or for the appointment of a receiver or any other proceedings under the mortgage, but have no right to involve the mortgage trustee in any personal liability without indemnifying it to its satisfaction. (Mortgage, Section 11, Article IX).

No holder of a first mortgage bond has the right to institute proceedings for the enforcement of the mortgage, unless

(i)

such holder previously has given the mortgage trustee written notice of an existing default,

(ii)

the holders of at least 25% of the outstanding principal amount of the first mortgage bonds have requested in writing that the mortgage trustee take action under the mortgage (and provided the mortgage trustee with indemnity satisfactory to it) and

(iii)

the mortgage trustee refuses or neglects to comply with such request within a reasonable time.

However, this provision does not impair the right of any holder of a first mortgage bond to enforce our obligation to pay the principal and interest on such first mortgage bond when due. (Mortgage, Section 12, Article IX)

The laws of the District of Columbia, the State of Maryland, the Commonwealth of Pennsylvania and the Commonwealth of Virginia, where the mortgaged property is located, may limit or deny the ability of the mortgage trustee or the bondholders to enforce certain rights and remedies provided in the mortgage in accordance with their terms.

The Trust Indenture Act requires that we furnish to the mortgage trustee annual certificates as to our compliance with the covenants and conditions in the mortgage.

Defeasance and Discharge

We may at any time deposit money for the payment or redemption of all or any part of the first mortgage bonds then outstanding, including the payment of all interest due thereon, with the mortgage trustee, and such first mortgage bonds will be deemed paid for purposes of the mortgage. If all of the first mortgage bonds, including all interest due thereon, have been paid or deemed paid, and we have observed all of our covenants under the mortgage, the mortgage trustee is obligated to cancel and discharge the lien of the mortgage upon our request. (Mortgage, Section 9, Article VIII; Article XVI)

Title

The person in whose name first mortgage bonds are registered is deemed the absolute owner thereof for the purpose of making payments and for all other purposes of the mortgage. (Mortgage, Section 7, Article II)

Resignation or Removal of Mortgage Trustee

The mortgage trustee may resign at anytime by giving not less than four weeks’ prior written notice to us and by publishing such notice in newspapers in Washington, D.C. and the City of New York. The mortgage

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trustee may be removed at any time by the holders of a majority in principal amount of first mortgage bonds then outstanding. (Mortgage, Section 3, Article XIII)

PLAN OF DISTRIBUTION

We may sell the Securities offered (a) through agents; (b) by underwriters or dealers; (c) directly to one or more purchasers; or (d) through a combination of any of these methods of sale.

In some cases we may also repurchase the Securities and reoffer them to the public by one or more of the methods described above.

This prospectus may be used in connection with any offering of securities through any of these methods or other methods described in the applicable prospectus supplement.

Any underwriter or agent involved in the offer and sale of the Securities will be named in the applicable prospectus supplement.

By Agents

Offered securities may be sold on a one time or a continuing basis by agents designated by the applicable registrant. The agents will use their reasonable efforts to solicit purchases for the period of their appointment under the terms of an agency agreement between the agents and the applicable issuer.

By Underwriters or Dealers

If underwriters are used in the sale, the underwriters may be designated by the applicable registrant or selected through a bidding process. The securities will be acquired by the underwriters for their own account. The underwriters may resell the Securities in one or more transactions, including negotiated transactions, at a fixed public offering price or at varying prices determined at the time of sale. Underwriters may sell the Securities to or through dealers, and such dealers may receive compensation in the form of discounts, concessions or commissions from the underwriters and/or commissions from the purchasers for whom they may act as agents. The obligations of the underwriters to purchase the Securities will be subject to certain conditions. The underwriters will be obligated to purchase all the Securities of the series offered if any of the securities are purchased. Any initial public offering price and any discounts or concessions allowed or re-allowed or paid to dealers may be changed from time to time.

Only underwriters named in the applicable prospectus supplement are deemed to be underwriters in connection with the Securities offered hereby.

If dealers are utilized in the sale of the Securities, the applicable registrant will sell the Securities to the dealers as principals. The dealers may then resell the Securities to the public at varying prices to be determined by such dealers at the time of resale. The names of the dealers and the terms of the transaction will be set forth in the applicable prospectus supplement.

Direct Sales

We may also sell Securities directly to the public. In this case, no underwriters or agents would be involved.

General Information

We may authorize agents, underwriters or dealers to solicit offers by certain institutions to purchase Securities from us at the public offering price pursuant to delayed delivery contracts providing for payment and delivery on a later date or dates, all as described in the applicable prospectus supplement. Each delayed delivery contract will be for an amount not less than, and the aggregate amount of the Securities shall be not less nor more than, the respective amounts stated in the applicable prospectus supplement. Such institutions may include commercial and savings banks, insurance companies, pension funds, investment companies, educational and charitable institutions, and other institutions, but will in all cases be subject to our approval. The delayed delivery contracts will not be subject to any conditions except:

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•

the purchase by an institution of the Securities covered by its delayed delivery contract shall not, at any time of delivery, be prohibited under the laws of any jurisdiction in the United States to which such delayed delivery contract is subject; and

•

if the Securities are being sold to underwriters, we shall have sold to those underwriters the total amount of the Securities less the amount thereof covered by the delayed delivery contracts. The underwriters will not have any responsibility in respect of the validity or performance of the delayed delivery contracts.

Unless otherwise specified in the related prospectus supplement, each series of the Securities will be a new issue with no established trading market, other than the common stock. Any common stock sold pursuant to a prospectus supplement or issuable upon conversion of another offered Security will be listed on The Nasdaq Stock Market LLC, subject to official notice of issuance. We may elect to list any of the other securities on an exchange but are not obligated to do so. It is possible that one or more underwriters may make a market in a series of the Securities, but no underwriter will be obligated to do so and any underwriter may discontinue any market making at any time without notice. We cannot predict the activity of trading in, or liquidity of, our Securities.

In connection with sales by an agent or in an underwritten offering, the SEC rules permit the underwriters or agents to engage in transactions that stabilize the price of the Securities. These transactions may include short sales, stabilizing transactions and purchases to cover positions created by short sales.

Short sales involve the sale by the underwriters or agents of a greater number of securities than they are required to purchase in an offering. Stabilizing transactions consist of certain bids or purchases made for the purpose of preventing or retarding a decline in the market price of the Securities while an offering is in progress.

The underwriters also may impose a penalty bid. This occurs when a particular underwriter repays to the underwriters a portion of the underwriting discount received by it because the underwriters have repurchased Securities sold by or for the account of that underwriter in stabilizing or short-covering transactions.

These activities by the underwriters may stabilize, maintain or otherwise affect the market price of the Securities. As a result, the price of the Securities may be higher than the price that otherwise might exist in the open market. If these activities are commenced, they may be discontinued by the underwriters at any time. These transactions may be effected on an exchange or automated quotation system, if the Securities are listed on that exchange or admitted for trading on that automated quotation system, in the over-the-counter market or otherwise.

We may from time to time, without the consent of the existing Security holders, create and issue further Securities having the same terms and conditions as the Securities being offered hereby in all respects, except for issue date, issue price and if applicable, the first payment of interest or dividends therein or other terms as noted in the applicable prospectus supplement. Additional Securities issued in this manner will be consolidated with, and will form a single series with, the previously outstanding securities.

Underwriters, dealers and agents that participate in the distribution of the Securities may be underwriters as defined in the Securities Act of 1933, and any discounts or commissions received by them from us and any profit on the resale of the Securities by them may be treated as underwriting discounts and commissions under the Securities Act.

We may have agreements with the underwriters, dealers and agents to indemnify them against certain civil liabilities, including liabilities under the Securities Act of 1933, or to contribute with respect to payments which the underwriters, dealers or agents may be required to make.

Underwriters, dealers and agents may engage in transactions with, or perform services for, us or our subsidiaries or affiliates in the ordinary course of their businesses.

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LEGAL MATTERS

Ballard Spahr LLP, Philadelphia, Pennsylvania, will render an opinion as to the validity of the Securities for us.

Winston & Strawn LLP, Houston, Texas, will render an opinion as to the validity of the Securities for any underwriters, dealers, purchasers or agents. Winston & Strawn LLP provides legal services to Exelon and its subsidiaries from time to time.

EXPERTS

The financial statements and management’s assessment of the effectiveness of internal control over financial reporting (which is included in Management’s Report on Internal Control over Financial Reporting) of Exelon Corporation incorporated in this prospectus by reference to the Annual Report on Form 10-K for the year ended December 31, 2023 have been so incorporated in reliance on the report of PricewaterhouseCoopers LLP, an independent registered public accounting firm, given on the authority of said firm as experts in auditing and accounting.

The financial statements incorporated in this prospectus by reference to Commonwealth Edison Company and Potomac Electric Power Company’s Annual Report on Form 10-K for the year ended December 31, 2023 have been so incorporated in reliance on the report of PricewaterhouseCoopers LLP, an independent registered public accounting firm, given on the authority of said firm as experts in auditing and accounting.

WHERE YOU CAN FIND MORE INFORMATION

Exelon, ComEd and Pepco each file reports and other information with the SEC. The public may read and copy any reports or other information that we file with the SEC at the SEC’s public reference room, 100 F Street, N.E., Room 1580, Washington, D.C. 20549. The public may obtain information on the operation of the public reference room by calling the SEC at 1-800-SEC-0330. These documents are also available to the public from commercial document retrieval services and at the web site maintained by the SEC at http://www.sec.gov. You may also obtain a copy of the registration statement at no cost by writing us at the following address:

Exelon Corporation
Attn: Investor Relations
10 South Dearborn Street — 54th Floor
P.O. Box 805398
Chicago, IL 60680-5398

This prospectus is one part of a registration statement filed on Form S-3 with the SEC under the Securities Act of 1933, as amended, known as the Securities Act. This prospectus does not contain all of the information set forth in the registration statement and the exhibits and schedules to the registration statement. For further information concerning us and the Securities, you should read the entire registration statement, including this prospectus and any related prospectus supplements, and the additional information described under the sub-heading “Documents Incorporated By Reference” below. The registration statement has been filed electronically and may be obtained in any manner listed above. Any statements contained herein concerning the provisions of any document are not necessarily complete, and, in each instance, reference is made to the copy of such document filed as an exhibit to the registration statement or otherwise filed with the SEC. Each such statement is qualified in its entirety by such reference.

Information about us is also available on Exelon’s web site at http://www.exeloncorp.com. The information on Exelon’s web site is not incorporated into this prospectus by reference, and you should not consider it a part of this prospectus.

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DOCUMENTS INCORPORATED BY REFERENCE

The SEC allows us to “incorporate by reference” information that we file with the SEC, which means that we can disclose important information to you by referring you to the documents we file with the SEC. The information incorporated by reference is an important part of this prospectus, and information that we file later with the SEC will automatically update and supersede this information. This incorporation by reference does not include documents that are furnished but not filed with the SEC. We incorporate by reference the documents listed below and any future documents that we file with the SEC under Section 13(a), 13(c), 14 or 15(d) of the Securities Exchange Act of 1934, as amended (known as the Exchange Act) but prior to the termination of any offering of securities made by this prospectus:

Exelon Corporation (Exchange Act File No. 001-16169)

•

The description of Exelon’s common stock contained in the registration statement on Form 8-A filed under the Securities Exchange Act of 1934 on October 10, 2000, as amended, including any amendment thereto or report filed for the purpose of updating such description;

•

Exelon’s Annual Report on Form 10-K for the year ended December 31, 2023; and

•

Exelon’s Current Reports on Form 8-K filed on February 6, 2024, February 27, 2024 and March 6, 2024

Commonwealth Edison Company (Exchange Act File No. 001-1839)

•

ComEd’s Annual Report on Form 10-K for the year ended December 31, 2023; and

•

ComEd’s Current Report on Form 8-K filed on February 6, 2024

Potomac Electric Power Company (Exchange Act File No. 001-01072)

•

Pepco’s Annual Report on Form 10-K for the year ended December 31, 2023; and

•

Pepco’s Current Report on Form 8-K filed on March 4, 2024

Upon written or oral request, we will provide without charge to each person, including any beneficial owner, to whom this prospectus is delivered, a copy of any or all of such documents which are incorporated herein by reference (other than exhibits to such documents unless such exhibits are specifically incorporated by reference into the documents that this prospectus incorporates). Written or oral requests for copies should be directed to Exelon Corporation, Attn: Investor Relations, 10 South Dearborn Street, 54th Floor, P.O. Box 805398, Chicago, IL 60680-5398, 312-394-2345.

Any statement contained in this prospectus, or in a document all or a portion of which is incorporated by reference, shall be modified or superseded for purposes of this prospectus to the extent that a statement contained in this prospectus, any supplement or any document incorporated by reference modifies or supersedes such statement. Any such statement so modified or superseded shall not, except as so modified or superseded, constitute a part of this prospectus.

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February , 2025

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