Form 4 Filing for ARMSTRONG WORLD INDUSTRIES INC

On April 8, 2026, Jill A. Crager, SVP Sales & Digital Mktg, reported transactions involving ARMSTRONG WORLD INDUSTRIES INC common stock. Crager acquired 4,111 shares through the conversion of performance-based restricted stock units (PSUs) that vested based on performance metrics certified on April 8, 2026, after a performance period from January 1, 2023, to December 31, 2025. These PSUs were granted under the 2022 Equity and Cash Incentive Plan. Following this acquisition, Crager disposed of 1,789 shares to cover tax obligations arising from the PSUs vesting, at a price of $172.77 per share. This resulted in a net increase in shares held, with post-transaction holdings reported at 8,439 shares after the acquisition and 6,650 shares after the disposal.