By /s/ Paul Myron Paul Myron Vice President and Controller (Also signing as Principal Accounting Officer) February 21, 2019 Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized. Pursuant to the requirements of the Securities Exchange Act of 1934, this report has been signed below by the following persons on behalf of the registrant and in the capacities and on the dates indicated. James F. Albaugh, Amy E. Alving, Christopher L. Ayers, Arthur D. Collins, Jr., Elmer L. Doty, Rajiv L. Gupta, David P. Hess, Sean O. Mahoney, David J. Miller, E. Stanley O’Neal, and Ulrich R. Schmidt, each as a Director, on February 21, 2019, by Paul Myron, their Attorney-in-Fact.*  *By /s/ Paul Myron Paul Myron Attorney-in-Fact 115 Signature Title Date /s/ John C. Plant Chairman and Chief Executive Officer February 21, 2019 John C. Plant (Principal Executive Officer and Director) /s/ Ken Giacobbe February 21, 2019 Ken Giacobbe Executive Vice President and Chief Financial Officer (Principal Financial Officer) SIGNATURES ARCONIC INC. Table of Contents