UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, DC 20549

SCHEDULE 14A

PROXY STATEMENT PURSUANT TO SECTION 14(a) OF THE

SECURITIES EXCHANGE ACT OF 1934

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ARCONIC INC.

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Arconic Inc. (the “Company”) updated the following slides in its Investor Presentation, originally filed on March 27, 2017, to add additional quotes from the Company’s customers and industry partners:

Customers Endorse Arconic’s Leadership and Strategic Direction

Endorsements from valued Arconic customers(1)

“In a technology-driven sector like aerospace...we need our top-tier “Investments in technology and rate readiness are more important suppliers operating as true business and industry partners. Klaus than ever within the supply chains of our growing aviation industry. Kleinfeld and his team have...improved our business relationship by GE supports Klaus and the Arconic commitment to those priorities focusing in the right areas, and the long-term future of our industry.” increasing our collective competitiveness and delivering innovation

and greater value to the customers we serve together in global—David Joyce, GE Vice Chair and GE Aviation President & CEO, Feb 2017

markets.”

— Dennis Muilenburg, Chairman, President & CEO, The Boeing Company, Mar 2017

“Klaus Kleinfeld and his team have been among our most valuable partners in the development of some of the most complex parts [of] Pratt & Whitney’s Geared Turbofan Engine. Their long-term focus and collaborative approach have been critical…[and we] “What I particularly value is Klaus’ deep understanding of the support Klaus and the rest of Arconic management as they remain critical levers to support [Airbus’] goals. As CEO of Airbus, I fully focused on the investments that will secure sustainable, long-term support his continued leadership of Arconic.“ growth for UTC, for Arconic, and for our entire industry.”

— Tom Enders, Chief Executive Officer, Airbus Group, Mar 2017—Gregory Hayes, Chairman, President & CEO, United Technologies Corp., Mar 2017

Source: Arconic

1) See Chapter 3 for detailed customer quotes. 14

Customers Endorse Strategic Direction and Leadership

Endorsements from selected valued Arconic customers

“At Airbus, we continually seek to drive increased fuel efficiency across our platforms. For us to succeed, supply chain advancements in metallurgy and advanced manufacturing are fundamental. Under Klaus Kleinfeld’s leadership, Arconic has Tom Enders built up significant materials science, precision manufacturing, and additive manufacturing expertise specifically designed for

Chief Executive Officer,

Airbus Group aerospace applications. With that, Arconic has become a key partner to Airbus for new technologies — both around aluminum and titanium. What I particularly value is Klaus’ deep understanding of the critical levers to support OEM goals. As CEO of Airbus, I fully support his continued leadership of Arconic.“ (March 2017)

David Joyce “Investments in technology and rate readiness are more important than ever within the supply chains of our growing aviation Vice Chair, GE industry. GE supports Klaus and the Arconic commitment to those priorities and the long-term future of our industry.”

President & CEO, GE Aviation (February 2017)

“In a dynamic, long-cycle, technology-driven sector like aerospace—where lives literally depend on what we do—we need our top-tier suppliers operating as true business and industry partners. That means not only working with us on cost and

Dennis Muilenburg schedule today, but investing in taking the quality, performance and safety of our products and services to the next level for

Chairman, President & CEO,

The Boeing Company tomorrow. Klaus Kleinfeld and his team have responded well to these imperatives and improved our business relationship by focusing in the right areas, increasing our collective competitiveness and delivering innovation and greater value to the customers we serve together in global markets.” (March 2017)

“United Technologies depends on our suppliers to maintain a long-term focus and to invest in the latest technologies for the aerospace industry. Klaus Kleinfeld and his team have been among our most valuable partners in the development of

Gregory Hayes some of the most complex parts that make up Pratt & Whitney’s Geared Turbofan Engine. Their long-term focus and

Chairman, President & CEO,

United Technologies Corp. collaborative approach have been critical throughout the design, development and production of this revolutionary technology. UTC supports Klaus and the rest of Arconic management as they remain focused on the investments that will secure sustainable, long-term growth for UTC, for Arconic, and for our entire industry.” (March 2017)

Source: Arconic

51

Industry Partners Endorse Strategic Direction and Leadership

Endorsements from selected valued Arconic partners

“For the past decade, I have had the chance to work closely with Klaus Kleinfeld as he has grown his firm’s international partnerships and reestablished its defense business. He has proven himself very adept at building the very senior

William Cohen, relationships essential for success in Asia and the Middle East. In the defense market, under his leadership Arconic has

Former U.S. Secretary of emerged as a critical player on aerospace, naval and ground systems, relied upon by OEMs and the government for

Defense innovative technologies and products that redefine what is possible in terms of performance and weight and cost reduction. Klaus understands that continuing to invest in R&D to maintain Arconic’s technical leadership is key to growth in the face of stiff competition.” (March 2017)

“Arconic operates in advanced manufacturing sectors requiring management to focus sharply on making capital investments, United Steelworkers supporting research and development, continually training its work force, and improving workplace safety. The members of

Workers Uniting(1)

UNITE the Union our unions demand that these expenditures be made because they understand better than anyone that keeping pace in a global market requires innovation” (February 2017)

Source: Arconic

1) Workers Uniting is a 2 million-member global union formed by UNITE the Union and the United Steelworkers (USW). Together, UNITE and the USW represent more than 7,700 Arconic employees in North America and the 51A United Kingdom.