
SECURITIES AND EXCHANGE COMMISSIONWashington, D.C. 20549FORM 10-K For the fiscal year ended December 31, 2025OR ☐TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF1934 For the transition period fromtoCommission File Number 1-898AMPCO-PITTSBURGH CORPORATION 25-1117717(I.R.S. Employer Identification No.) 726 Bell Avenue, Suite 301Carnegie, Pennsylvania 15106(Address of principal executive offices)(412) 456-4400(Registrant’s telephone number)Securities registered pursuant to Section 12(b) of the Act: 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 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 thepreceding 12 months (or for such shorter period that the Registrant was required to file such reports), and (2) has been subject to such filing requirements for the past90 days.Yes☒No☐ Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company, or an emerginggrowth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company,” and “emerging growth company” in Rule 12b-2of the Exchange Act. Large accelerated filer☐Non-accelerated filer☒ Accelerated filer☐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 revisedfinancial accounting standards provided pursuant to Section 13(a) of the Exchange Act.☐ Indicate by check mark whether the registrant has filed a report on and attestation to its management’s assessment of the effectiveness of its internal control overfinancial reporting under Section 404(b) of the Sarbanes-Oxley Act (15 U.S.C. 7262(b)) by the registered public accounting firm that prepared or issued its auditreport.☐ If securities are registered pursuant to Section 12(b) of the Act, indicate by check mark whether the financial statements of the registrant included in the filing reflectthe correction of an error to previously issued financial statements.☐ Indicate by check mark whether any of those error corrections are restatements that required a recovery analysis of incentive-based compensation received by any ofthe registrant’s executive officers during the relevant recovery period pursuant to §240.10D-1(b).☐ 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 voting stock of Ampco-Pittsburgh Corporation held by non-affiliates on June 30, 2025 (based upon the closing price of theRegistrant’s Common Stock on the New York Stock Exchange on that date) was approximately $36 million.As of March 11, 2026, 20,326,389 common shares were outstanding. Documents Incorporated by Reference: Part III of this report incorporates by reference certain information from the Proxy Statement for the 2026 Annual Meeting TABLE OF CONTENTS PART I PART II PART III Part IV Item 15. Exhibits and Financial Statement Schedules Signatures79 FORWARD-LOOKING STATEMENTS The Private Securities Litigation Reform Act of 1995 (the “Act”) provides a safe harbor for forward-looking statements made by usor on behalf of Ampco-Pittsburgh Corporation and its subsidiaries (collectively, “we,” “us,” “our,” or the “Corporation”).Management’s Discussion and Analysis of Financial Condition and Results of Operationsand other sections of this Annual Reporton Form 10-K, as well as the consolidated financial statements and notes hereto, may include, but are not limited to, statementsabout operating performance, trends and events we expect or anticipate will occur in the future, statements about sales andproduction levels, timing of orders for our products, restructurings, the impact from pandemics and geopolitical conflicts,profitability and anticipated expenses, inflation, fluctuation of foreign currencies relative to the value of the U.S. dollar and thefunctional (local) currencies of our subsidiaries, the global supply chain, the continued impact of tariffs, global trade conditions,and cash outflows. All statements in this document other than statements of historical fact are statements that are, or could be,deemed “forward-looking statements” within the meaning of the Act and words such as “may,” “will,” “intend,” “believe,”“expect,” “anticipate,” “estimate,” “project,” “target,” “goal,” “forecast,” and other terms of similar meaning that indicate futureevents and trends are also generally intended to identify forward-looki