Sec Form 4 Filing - Powers Elizabeth C @ ALLEGHENY TECHNOLOGIES INC - 2019-02-27

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 Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person Powers Elizabeth C 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) Senior VP, CHRO (Last) (First) (Middle) 1000 SIX PPG PLACE 3. Date of Earliest Transaction (MM/DD/YY) 02/27/2019 (Street) PITTSBURGH, PA15222 4. If Amendment, Date Original Filed (MM/DD/YY) 6. Individual or Joint/Group Filing (Check Applicable Line) __ X __ Form filed by One Reporting Person _____ Form filed by More than One Reporting Person (City) (State) (Zip)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned 1.Title of Security (Instr. 3) 2. Transaction Date (MM/DD/YY) 2A. Deemed Execution Date, if any (MM/DD/YY) 3. Transaction 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, par value $0.10 per share 02/27/2019 A 13,843 ( 1 ) A $ 29.255 ( 2 ) 67,953.8038 ( 3 ) D Common Stock, par value $0.10 per share 02/28/2019 M 18,571 ( 4 ) A $ 28.92 ( 5 ) 86,524.8038 ( 3 ) D Common Stock, par value $0.10 per share 02/28/2019 F 8,447 ( 6 ) D $ 28.92 ( 5 ) 78,077.8038 ( 3 ) D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities) 1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (MM/DD/YY) 3A. Deemed Execution Date, if any (MM/DD/YY) 4. Transaction 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 (MM/DD/YY) 7. Title and Amount of Underlying Securities (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

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other Powers Elizabeth C 1000 SIX PPG PLACE PITTSBURGH, PA15222 Senior VP, CHRO Signatures /s/ Elliot S. Davis, Attorney-in-Fact for Elizabeth C. Powers 03/01/2019 Signature of Reporting Person Date

Explanation of Responses:

( 1 )Award of restricted stock units granted on February 27, 2019, 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. ( 2 )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 27, 2019. ( 3 )This amount includes 1,693.349759 shares of common stock that Ms. Powers owns in the Company's 401(k) Plan. Fluctuations in 401(k) share amounts reflect the Plan's unit reporting method. Ms. Powers holds approximately 1,422 units, which represent interests in the Company's stock fund. ( 4 )Settlement of performance-vested restricted stock units that were granted in 2016, the vesting of which was contingent upon the Issuer's achievement of specified performance criteria during the period from January 1, 2016 through December 31, 2018 (the "2016-2018 PSUs"). The Issuer's partial achievement of such performance criteria was certified, and a corresponding portion of the shares underlying the 2016-2018 PSUs became payable, as of February 28, 2019. ( 5 )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 28, 2019. ( 6 )Shares withheld for payment of taxes in connection with the February 28, 2019 settlement of the 2016-2018 PSUs.

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.

* If the form is filed by more than one reporting person, see Instruction 4(b)(v).

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