☒QUARTERLY REPORT PURSUANT TO SECTION 13 or 15(d) OF THE SECURITIES EXCHANGEACT OF 1934 For the quarterly period ended March 31, 2026 OR ☐TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGEACT OF 1934 For the transition period fromtoCommission File Number 1-898 AMPCO-PITTSBURGH CORPORATION 25-1117717(I.R.S. EmployerIdentification No.) Pennsylvania(State ofIncorporation) 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: Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the SecuritiesExchange Act of 1934 during the preceding 12 months (or for such shorter periods that the registrant was required to file such reports), 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 every Interactive Data File required to be submitted pursuantto Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant wasrequired to submit such files).Yes☒No☐ Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, smaller reportingcompany, or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reportingcompany,” and “emerging growth company” in Rule 12b-2 of the Exchange Act. Large accelerated filer☐Accelerated filer☐Emerging growth company☐Non-accelerated filer☒Smaller reporting company☒ If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period forcomplying 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☒On May 7, 2026, 20,326,389 common shares were outstanding. AMPCO-PITTSBURGH CORPORATIONINDEX Part I–Financial Information: Item 1–Financial Statements (Unaudited)Condensed Consolidated Balance Sheets – March 31, 2026 and December 31, 20253Condensed Consolidated Statements of Operations – Three Months Ended March 31, 2026 and 20254Condensed Consolidated Statements of Comprehensive(Loss) Income – Three Months Ended March31, 2026 and 20255Condensed Consolidated Statements of Shareholders’ Equity – Three Months Ended March 31, 2026and 20256Condensed Consolidated Statements of Cash Flows – Three Months Ended March 31, 2026 and 20257Notes to Condensed Consolidated Financial Statements8Item 2–Management’s Discussion and Analysis of Financial Condition and Results of Operations23Item 3–Quantitative and Qualitative Disclosures About Market Risk33Item 4–Controls and Procedures33Part II–Other Information:Item 1–Legal Proceedings34Item 1A–Risk Factors34Item 5–Other Information34Item 6–Exhibits35Signatures36 PART I – FINANCIAL INFORMATIONAMPCO-PITTSBURGH CORPORATIONCONDENSED CONSOLIDATED BALANCE SHEETS(UNAUDITED)(in thousands, except par value) AMPCO-PITTSBURGH CORPORATIONCONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS(UNAUDITED)(in thousands, except per share amounts) AMPCO-PITTSBURGH CORPORATIONCONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE (LOSS) INCOME(UNAUDITED)(in thousands) AMPCO-PITTSBURGH CORPORATIONNOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS(UNAUDITED)(in thousands, except per share amounts) Overview of the Business Ampco-Pittsburgh Corporation (the “Corporation”) manufactures and sells highly engineered, high-performance specialty metal productsand customized equipment utilized by industry throughout the world. It operates in two business segments – theForged and CastEngineered Products(“FCEP”) segment and theAir and Liquid Processing(“ALP”) segment. This segment presentation is consistent withhow the Corporation’s chief operating decision-maker (“CODM”) evaluates financial performance and makes resource allocation andstrategic decisions about the business (Note 18). Note 1 – Unaudited Condensed Consolidated Financial Statements The unaudited condensed consolidated balance sheet as of March 31, 2026 and the unaudited condensed consolidated statements ofoperations, comprehensive (loss) income, shareholders’ equity, and cash flows for the three months ended March 31, 2026 and 2025, havebeen prepared by the Corporation. In the opinion of management, all adjustments, consisting of only normal and recurring adjustmentsnecessary to present fairly the financial position, results of operations and cash flows for the periods presented, have been made.Theresults of operations for the three months ended March 31, 2026 are not necessarily indicative of the operating results expected for the fullyear. Certain information and footnot