Form 4 Filing for Armstrong World Industries Inc.

This filing details a transaction by Roy W. Templin, a director at Armstrong World Industries Inc. On June 12, 2026, Mr. Templin acquired 1,265 shares of Common Stock through restricted stock units granted under the 2016 Directors Stock Unit Plan. These units are part of the non-employee Director Compensation Program and vest on the earlier of the next annual shareholders' meeting, the director's death or disability, or a Change in Control. The grant date fair value of these units was calculated using the closing stock price of $154.21 on June 12, 2026. Following this transaction, Mr. Templin directly owns 20,716 shares. The filing also includes details about the nature of the units, including vested, unvested, and not-yet-acquirable units, and the conditions for acquirability by the director.