Alcoa (AA) 10-Q2017 Q3 Quarterly report

Filed: 27 Oct 17, 12:00am

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New words: aBB, amnesty, assumption, back, civil, climbed, drought, Estreito, eventual, flat, formula, holiday, issuable, legacy, lighten, Luminant, newly, nonfinancial, Pittsburgh, powder, practice, predetermined, prevented, rationally, regular, relocation, renegotiating, reopen, repayment, sheetof, Social, standby, storage, subtracted, systematically, tailing, treasurer, unclear, upgraded, washing

Removed: estimable, greater, Patent, schedule, small

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Exhibit 15

October 27, 2017

Securities and Exchange Commission

100 F Street, NE

Washington, D.C. 20549

RE: Alcoa Corporation

Commissioners:

We are aware that our report dated October 27, 2017 on our review of interim financial information of Alcoa Corporation and its subsidiaries (Alcoa Corporation) for the three- and nine-month periods ended September 30, 2017 and 2016 and included in Alcoa Corporation’s quarterly report on Form10-Q for the quarter ended September 30, 2017 is incorporated by reference in its Registration Statements on FormS-8 (Nos.333-214420,333-214423, and333-218038).

Very truly yours,

/s/ PricewaterhouseCoopers LLP

PricewaterhouseCoopers LLP

Pittsburgh, Pennsylvania

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