阿姆斯特朗 2025年度报告

☒ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2025 OR ☐TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934For the transition period fromto _________Commission File Number 1-2116 ARMSTRONG WORLD INDUSTRIES, INC. (Exact name of registrant as specified in its charter) 23-0366390(I.R.S. EmployerIdentification No.) 17603(Zip Code) Registrant’s telephone number, including area code (717) 397-0611Securities 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 has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of RegulationS-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter time period that the registrant was required 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, 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☐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 Act).Yes☐No☒ The aggregate market value of the Common Stock of Armstrong World Industries, Inc. held by non-affiliates based on the closing price ($162.44 per share) on theNew York Stock Exchange (trading symbol AWI) as of June 30, 2025 was approximately $7.0 billion. As of February 18, 2026, the number of shares outstanding ofthe registrant's Common Stock was 42,834,049.Documents Incorporated by Reference Certain sections of Armstrong World Industries, Inc.’s definitive Proxy Statement for use in connection with its 2026 annual meeting of shareholders, to be filed nolater than April 30, 2026 (120 days after the last day of our 2025 fiscal year), are incorporated by reference into Part III of this Form 10-K Report where indicated. Auditor Name: KPMG LLP Auditor Firm ID: 185 TABLE OF CONTENTS Cautionary Note Regarding Forward-Looking Statements PART IItem 1.BusinessItem 1A.Risk FactorsItem 1B.Unresolved Staff CommentsItem 1C.CybersecurityItem 2.PropertiesItem 3.Legal ProceedingsItem 4.Mine Safety Disclosures PART IIItem 5.Market for the Registrant’s Common Equity, Related Stockholder Matters and Issuer Purchases of EquitySecurities22Item 6.[Reserved]22Item 7.Management’s Discussion and Analysis of Financial Condition and Results of Operations23Item 7A.Quantitative and Qualitative Disclosures About Market Risk34Item 8.Financial Statements and Supplementary Data35Item 9.Changes in and Disagreements with Accountants on Accounting and Financial Disclosure81Item 9A.Controls and Procedures81Item 9B.Other Information81Item 9C.Disclosure Regarding Foreign Jurisdictions that Prevent Inspections81 PART IIIItem 10.Directors, Executive Officers and Corporate Governance82Item 11.Executive Compensation82Item 12.Security Ownership of Certain Beneficial Owners and Management and Related Sto