Segment Reorganization

Howmet Aerospace Inc. (the "Company" or "Howmet Aerospace") is filing this Current Report on Form 8-K to recast historical segment information as set forth in the Company's Annual Report on Form 10-K for the year ended December 31, 2025, as filed with the Securities and Exchange Commission ("SEC") on February 12, 2026 ("Original Report").

As previously disclosed and as reflected in the Company's Quarterly Report on Form 10-Q for the quarterly period ended March 31, 2026, in the first quarter of 2026, the Company's Chief Operating Decision Maker reorganized Howmet's segments by moving a titanium alloy location from Engine Products to Engineered Structures as it better aligns with the operations of the Engineered Structures segment.The recasting had no impact on the Company's consolidated results, financial position or cash flows. The titanium alloy location is one of the Company's facilities at Whitehall, Michigan.

Exhibit 99.1 to this Form 8-K provides recast segment information within the following items of the Company's Original Report to reflect the movement of the titanium alloy location from Engine Products to Engineered Structures:

•Part II Item 7. Management's Discussion and Analysis of Financial Condition and Results of Operations - solely to reflect an explanation of the change under the heading "Segment Information" and changes in the numbers appearing in the tables and narrative under the headings "Segment Information—Engine Products" and "Segment Information—Engineered Structures"; and

•Part II Item 8. Financial Statements and Supplementary Data - solely to reflect changes in "Note C.Segment and Geographic Area Information" in the "Notes to the Consolidated Financial Statements."

The items above included in Exhibit 99.1 of this Form 8-K update the same items presented in the Original Report solely to reflect the movement of the titanium alloy location from Engine Products to Engineered Structures and the related impacts to segment disclosures as a result of the recast described above and do not represent a restatement of previously issued financial statements. There are no changes to other disclosures presented in the Original Report, including the Company's previously reported statement of consolidated operations, statement of consolidated comprehensive income, consolidated balance sheet, statement of consolidated cash flows or statement of changes in consolidated equity.

Except as described below under "JPY Term Loan Facility Prepayment and Cross-Currency Swap," this Current Report on Form 8-K does not reflect changes or events occurring subsequent to the original filing of the Original Report and does not modify or update the disclosures in any way, other than as required to retrospectively recast the movement of the titanium alloy location from Engine Products to Engineered Structures. Therefore, this Form 8-K should be read in conjunction with the Company's Original Report as filed, Quarterly Report on Form 10-Q for the quarterly period ended March 31, 2026, and other current reports on Form 8-K.