X0609 4 2026-04-28 0000007431 ARMSTRONG WORLD INDUSTRIES INC AWI 0001509566 Grizzle Victor false C/O ARMSTRONG WORLD INDUSTRIES, INC. 2500 COLUMBIA AVENUE LANCASTER PA 17603 1 1 Executive Chair 0 Common Stock 2026-04-28 4 M 0 72823 169.84 A 537493 D Common Stock 2026-04-28 4 F 0 31671 169.84 D 505822 D Restricted Stock Units 2026-04-28 4 M 0 72823 D Common Stock 72823 0 D Restricted Stock Units convert into common stock on a one-for-one basis. Represents the number of shares withheld by the Issuer to satisfy the Reporting Person's tax obligations incurred upon the vesting of certain restricted stock units granted to the Reporting Person under the 2022 Equity and Cash Incentive Plan. On April 28, 2023, the Reporting Person was granted 72,823 Restricted Stock Units, which vest on the third anniversary of the grant (contingent upon the Reporting Person's employment with the Issuer on the scheduled vesting date). Price of Derivative Security is $0. /s/ Alan M. Kidd, Attorney-in-fact 2026-04-29