X0609 4 2026-09-09 0000007431 ARMSTRONG WORLD INDUSTRIES INC AWI 0001949030 Kozak Jennifer Ott false C/O ARMSTRONG WORLD INDUSTRIES, INC. 2500 COLUMBIA AVENUE LANCASTER PA 17603 1 SVP, CHRO 0 Restricted Stock Units 2026-09-09 4 A 0 1496 A Common Stock 1496 1496 D Restricted Stock Units 2026-09-09 4 A 0 1183 A Common Stock 1183 2679 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. On September 9, 2026, the Reporting Person was granted 1,496 restricted stock units, which vest as follows: (1) 498 on the first anniversary of the grant, (2) 499 on the second anniversary of the grant and (3) 499 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). Price of Derivative Security is $0. The restricted stock units were granted to the Reporting Person on September 9, 2026 and will vest in full on September 9, 2029 (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 2026-09-10