Form 4 Filing for ARMSTRONG WORLD INDUSTRIES INC

Richard D. Holder, a director at ARMSTRONG WORLD INDUSTRIES INC, acquired 876 units of Common Stock on June 12, 2026, as part of the Issuer's nonemployee Director Compensation Program. These restricted stock units, granted under the 2016 Directors Stock Unit Plan, vest on the earlier of the next annual shareholders meeting, death or disability, or a Change in Control. The grant date fair value was calculated using the closing stock price of $154.21 on June 12, 2026. Following this transaction, Holder owns 6223 shares. The filing also notes that vested units are not acquirable until the Director elects to receive them upon vesting or termination of service. The filing is a Form 4, indicating a change in beneficial ownership.