Amended Statement of Changes in Beneficial Ownership (4/a)

FORM 4

[ ] Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES

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Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940

1. Name and Address of Reporting Person * Buckley John L	2. Issuer Name and Ticker or Trading Symbol Cornerstone Building Brands, Inc. [ CNR ]	5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director                    _____ 10% Owner __X__ Officer (give title below)    _____ Other (specify below) Pres., Siding Division
(Last)          (First)          (Middle) 5020 WESTON PARKWAY, SUITE 400	3. Date of Earliest Transaction (MM/DD/YYYY) 3/16/2020
(Street) CARY, NC 27513 (City)        (State)        (Zip)	4. If Amendment, Date Original Filed (MM/DD/YYYY) 3/17/2020	6. Individual or Joint/Group Filing (Check Applicable Line) _X _ Form filed by One Reporting Person ___ Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1.Title of Security (Instr. 3)	2. Trans. Date	2A. Deemed Execution Date, if any	3. Trans. Code (Instr. 8)		4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivate Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Trans. Date	3A. Deemed Execution Date, if any	4. Trans. Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Option (Right to Buy)	$4.52 (1)	3/16/2020		A		35377 (2)		(1)	3/16/2030	Common Stock, $0.01 par value	35377 (2)	$0	35377 (2)	D

Explanation of Responses:
(1)	The options are subject to vesting in equal annual installments on March 16, 2021, March 16, 2022, and March 16, 2023, unless forfeited prior to such date.
(2)	Amended to disclose the true number of options acquired on March 16, 2020.

Reporting Owners
Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
Buckley John L 5020 WESTON PARKWAY, SUITE 400 CARY, NC 27513			Pres., Siding Division

Signatures
/s/ Todd R. Moore (by power of attorney)		3/19/2020
**Signature of Reporting Person		Date