X0508 4 2024-04-22 0000007431 ARMSTRONG WORLD INDUSTRIES INC AWI 0001940368 Kirchner-King Dawn M. C/O ARMSTRONG WORLD INDUSTRIES, INC. 2500 COLUMBIA AVENUE LANCASTER PA 17603 1 SVP Human Resources 0 Restricted Stock Units 2024-04-22 4 A 0 1308 0 A Common Stock 1308 1308 D Each restricted stock unit represents a contingent right to receive one share of the Issuer's common stock under the Issuer's 2022 Equity and Cash Incentive Plan. The restricted stock units were granted to the Reporting Person on April 22, 2024 and will vest as follows: (1) 436 on the first anniversary of the grant, (2) 436 on the second anniversary of the grant, and (3) 436 on the third anniversary of the grant (contingent upon the Reporting Person's employment with the Issuer on the scheduled vesting date, except as provided for under the Issuer's 2022 Equity and Cash Incentive Plan). /s/ Alan M. Kidd, Attorney-in-fact 2024-04-23