SEC Form 4

FORM 4		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 or Section 30(h) of the Investment Company Act of 1940	OMB APPROVAL OMB Number: 3235-0287 Estimated average burden hours per response: 0.5
	Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

1. Name and Address of Reporting Person* Mahoney Sean O (Last) (First) (Middle) 390 PARK AVENUE (Street) NEW YORK, NY 10022 (City) (State) (Zip)	2. Issuer Name and Ticker or Trading Symbol Arconic Inc. [ ARNC ]	5. Relationship of Reporting Person(s) to Issuer (Check all applicable) X Director 10% Owner Officer (give title below) Other (specify below)
	3. Date of Earliest Transaction (Month/Day/Year) 03/15/2017
	4. If Amendment, Date of Original Filed (Month/Day/Year)	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. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	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

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 (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	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 (Month/Day/Year)		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: 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
Phantom Stock Units	(1)	03/15/2017		J			1,545(2)	(3)	(3)	Common Stock	1,545	$27.26	7,234(4)(5)	D

Explanation of Responses:

1. Each phantom stock unit is the economic equivalent of one share of Arconic common stock.

2. Represents a partial reversal of a transaction on April 1, 2016, where an excess number of phantom stock units was acquired due to administrative errors in calculating applicable payment and crediting amounts.

3. Phantom stock units are acquired under the Issuer's Amended and Restated Deferred Fee Plan for Directors and are to be paid out in cash after Board service ends.

4. On October 5, 2016, the Issuer effected a 1-for-3 reverse stock split of its common stock (the "Reverse Stock Split"). The amount of securities reported on this Form 4 have been adjusted to reflect the Reverse Stock Split.

5. On November 1, 2016, the Issuer completed the separation of its business into two independent, publicly-traded companies (the "Separation"): the Issuer and Alcoa Corporation. In connection with the Separation, and pursuant to the terms of an Employee Matters Agreement dated October 31, 2016, by and between the Issuer and Alcoa Corporation, all phantom stock units held by the reporting person with respect to the Issuer's common stock were adjusted in a manner intended to preserve the aggregate intrinsic value of the phantom stock units immediately prior to the Separation. The amount of securities reported on this Form 4 reflect the aforementioned adjustment.

Remarks:

	/s/ Margaret Lam (Assistant Secretary), by power of attorney	03/17/2017
	** Signature of Reporting Person	Date
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).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
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