Item 9A. Controls and Procedures.

(a) Evaluation of Disclosure Controls and Procedures

Arconic’s Chief Executive Officer and Chief Financial Officer have evaluated the Company’s disclosure controls and procedures, as defined in Rules 13a-15(e) and 15d-15(e) of the Securities Exchange Act of 1934, as of the end of the period covered by this report, and they have concluded that these controls and procedures are effective.

(b) Management’s Annual Report on Internal Control over Financial Reporting

Management’s Report on Internal Control over Financial Reporting is included in Part II, Item 8 of this Form 10-K beginning on page 51.

(c) Attestation Report of the Registered Public Accounting Firm

The effectiveness of Arconic’s internal control over financial reporting as of December 31, 2018 has been audited by PricewaterhouseCoopers LLP, an independent registered public accounting firm, as stated in their report, which is included in Part II, Item 8 of this Form 10-K on page 52.

(d) Changes in Internal Control over Financial Reporting

There have been no changes in internal control over financial reporting during the fourth quarter of 2018, that have materially affected, or are reasonably likely to materially affect, the Company’s internal control over financial reporting.