Statement of Changes in Beneficial Ownership (4)

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 * Schwartz Karl D	2. Issuer Name and Ticker or Trading Symbol ALLEGHENY TECHNOLOGIES INC [ ATI ]	5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director                    _____ 10% Owner __X__ Officer (give title below)    _____ Other (specify below) VP, Controller & CAO
(Last)          (First)          (Middle) 1000 SIX PPG PLACE	3. Date of Earliest Transaction (MM/DD/YYYY) 2/24/2020
(Street) PITTSBURGH, PA 15222 (City)        (State)        (Zip)	4. If Amendment, Date Original Filed (MM/DD/YYYY)	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
Common Stock, $0.10 par value per share	2/24/2020		A		9657 (1)	A	$0.00	45697.4283 (2)	D
Common Stock, $0.10 par value per share	2/24/2020		F		4364 (3)	D	$19.44 (4)	41333.4283 (2)	D
Common Stock, $0.10 par value per share	2/24/2020		F		452 (5)	D	$19.44 (4)	40881.4283 (2)	D
Common Stock, $0.10 par value per share	2/24/2020		A		7003 (6)	A	$0.00	47884.4283	D

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

Explanation of Responses:
(1)	Settlement of performance-vested restricted stock units that were granted in 2017, the vesting of which was contingent upon the Issuer's achievement of specified performance criteria during the period form January 1, 2017 through December 31, 2019 (the "2017-2019 PSUs"). The shares underlying the 2017-2019 PSUs became payable as of February 24, 2020 following certification of the Issuer's achievement of such performance criteria by the Personnel and Compensation Committee of the Issuer's Board of Directors.
(2)	This amount includes 6,190.3743 shares of common stock that Mr. Schwartz owns in the Company's 401(k) Plan. Fluctuations in 401(k) share amounts reflect the Plan's unit reporting method. Mr. Schwartz holds approximately 5,191 units, which represent interests in the Company's stock fund.
(3)	Shares withheld for payment of taxes in connection with the February 24, 2020 settlement of the 2017-2019 PSUs.
(4)	Represents the average of the high and low trading prices for one share of the Issuer's common stock on the New York Stock Exchange on February 24, 2020.
(5)	Shares withheld for payment of taxes on restricted stock units awarded on February 23, 2017. One-third of such restricted stock units vested by their terms on February 24, 2020.
(6)	Award of restricted stock units, which are settled in shares of stock upon vesting. The award vests in three equal annual installments on each of the first three anniversaries of the grant date.

Reporting Owners
Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
Schwartz Karl D 1000 SIX PPG PLACE PITTSBURGH, PA 15222			VP, Controller & CAO

Signatures
/s/ Elliot S. Davis, Attorney-in-Fact for Karl D. Schwartz		2/26/2020
**Signature of Reporting Person		Date