ARCONIC INC. (Exact Name of Registrant As Specified in Its Charter)

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-K [ x ] ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For The Fiscal Year Ended December 31, 2017 OR [ ] TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Commission File Number 1-3610 ARCONIC INC. (Exact name of registrant as specified in its charter) Delaware 25-0317820 (State of incorporation) (I.R.S. Employer Identification No.) 390 Park Avenue, New York, New York 10022-4608 (Address of principal executive offices) (Zip code) Registrant’s telephone numbers: Investor Relations------------— (212) 836-2758 Office of the Secretary-------—(212) 836-2732 Securities registered pursuant to Section 12(b) of the Act: Title of each class Name of each exchange on which registered Common Stock, par value $1.00 per share New York Stock Exchange $3.75 Cumulative Preferred Stock, par value $100.00 per share NYSE American Securities registered pursuant to Section 12(g) of the Act: None Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act. Yes No . Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the Exchange Act. Yes No . Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months, and (2) has been subject to such filing requirements for the past 90 days. Yes No . Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Website, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files). Yes No . Indicate by check mark if disclosure of delinquent filers pursuant to Item 405 of Regulation S-K is not contained herein, and will not be contained, to the best of registrant’s knowledge, in definitive proxy or information statements incorporated by reference in Part III of this Form 10-K or any amendment to this Form 10-K. [] Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or a smaller reporting company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company,” and “emerging growth company” in Rule 12b-2 of the Exchange Act. Large accelerated filer [ ] Accelerated filer [] Non-accelerated filer [] (Do not check if a smaller reporting company) Smaller reporting company [] Emerging growth company [] If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. [ ] Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act). Yes No . The aggregate market value of the outstanding common stock, other than shares held by persons who may be deemed affiliates of the registrant, as of the last business day of the registrant’s most recently completed second fiscal quarter was approximately $10 billion. As of February 16, 2018, there were 482,772,252 shares of common stock, par value $1.00 per share, of the registrant outstanding. Table of Contents Documents incorporated by reference. Part III of this Form 10-K incorporates by reference certain information from the registrant’s definitive Proxy Statement for its 2018 Annual Meeting of Shareholders to be filed pursuant to Regulation 14A (Proxy Statement). Table of Contents TABLE OF CONTENTS Page(s) Part I Item 1. Business 1 Item 1A. Risk Factors 15 Item 1B. Unresolved Staff Comments 27 Item 2. Properties 27 Item 3. Legal Proceedings 28 Item 4. Mine Safety Disclosures 30 Part II Item 5. Market for Registrant’s Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities 31 Item 6. Selected Financial Data 33 Item 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations 34 Item 7A. Quantitative and Qualitative Disclosures About Market Risk 57 Item 8. Financial Statements and Supplementary Data 57 Item 9. Changes in and Disagreements With Accountants on Accounting and Financial Disclosure 113 Item 9A. Controls and Procedures 113 Item 9B. Other Information 113 Part III Item 10. Directors, Executive Officers and Corporate Governance 114 Item 11. Executive Compensation 114 Item 12. Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters 114 Item 13. Certain Relationships and Related Transactions, and Director Independence 114 Item 14. Principal Accounting Fees and Services 114 Part IV Item 15. Exhibits, Financial Statement Schedules 115 Item 16. Form 10-K Summary 124 Signatures 125 Note on Incorporation by Reference In this Form 10-K, selected items of information and data are incorporated by reference to portions of the Proxy Statement. Unless otherwise provided herein, any reference in this report to disclosures in the Proxy Statement shall constitute incorporation by reference of only that specific disclosure into this Form 10-K. Table of Contents PART I Item 1. Business. General Arconic Inc. is a Delaware corporation with its principal office in New York, New York and the successor to Arconic Pennsylvania (as defined below) which was formed in 1888 and formerly known as Alcoa Inc. In this report, unless the context otherwise requires, “Arconic” or the “Company” means Arconic Inc., a Delaware corporation, and all subsidiaries consolidated for the purposes of its financial statements. The Company’s Internet address is http://www.arconic.com. Arconic makes available free of charge on or through its website its annual report on Form 10-K, quarterly reports on Form 10-Q, current reports on Form 8-K, and amendments to those reports filed or furnished pursuant to Section 13(a) or 15(d) of the Securities Exchange Act of 1934 as soon as reasonably practicable after the Company electronically files such material with, or furnishes it to, the Securities and Exchange Commission (SEC). The information on the Company’s Internet site is not a part of, or incorporated by reference in, this annual report on Form 10- K. The SEC maintains an Internet site that contains these reports at http://www.sec.gov. Forward-Looking Statements This report contains (and oral communications made by Arconic may contain) statements that relate to future events and expectations and, as such, constitute forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995. Forward-looking statements include those containing such words as “anticipates,” “believes,” “could,” “estimates,” “expects,” “forecasts,” “goal,” “guidance,” “intends,” “may,” “outlook,” “plans,” “projects,” “seeks,” “sees,” “should,” “targets,” “will,” “would,” or other words of similar meaning. All statements that reflect Arconic’s expectations, assumptions or projections about the future, other than statements of historical fact, are forward-looking statements, including, without limitation, forecasts relating to the growth of the aerospace, automotive, commercial transportation and other end markets; statements and guidance regarding future financial results or operating performance; statements about Arconic’s strategies, outlook, business and financial prospects; and statements regarding potential share gains. Forward-looking statements are not guarantees of future performance and are subject to risks, uncertainties, and changes in circumstances that are difficult to predict. Although Arconic believes that the expectations reflected in any forward-looking statements are based on reasonable assumptions, it can give no assurance that these expectations will be attained and it is possible that actual results may differ materially from those indicated by these forward-looking statements due to a variety of risks and uncertainties. For a discussion of some of the specific factors that may cause Arconic’s actual results to differ materially from those projected in any forward-looking statements, see the following sections of this report: Part I, Item 1A. (Risk Factors), Part II, Item 7. (Management’s Discussion and Analysis of Financial Condition and Results of Operations), including the disclosures under Segment Information and Critical Accounting Policies and Estimates, and Note K and the Derivatives Section of Note U to the Consolidated Financial Statements in Part II, Item 8. (Financial Statements and Supplementary Data). Market projections are subject to the risks discussed in this report and other risks in the market. Arconic disclaims any intention or obligation to update publicly any forward-looking statements, whether in response to new information, future events or otherwise, except as required by applicable law. Overview Arconic is a global leader in lightweight metals engineering and manufacturing. Arconic’s innovative, multi-material products, which include aluminum, titanium, and nickel, are used worldwide in aerospace, automotive, commercial transportation, packaging, building and construction, oil and gas, defense, consumer electronics, and industrial applications. Arconic is a global company operating in 18

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