Michael Winters Restricted Stock Units Filing for Armstrong World Industries

This Form 3 filing reports the equity holdings of Michael Carl Winters, Senior Vice President of Architectural Specification & Business Development at Armstrong World Industries Inc. The filing discloses Winters' ownership of 635 shares of common stock and multiple restricted stock unit (RSU) grants totaling 5,103 shares. The RSUs were granted under the company's 2022 Equity and Cash Incentive Plan at various dates between December 2023 and February 2026, with vesting schedules extending through February 2029. Each RSU represents a contingent right to receive one share of common stock, subject to continued employment through the vesting dates. The largest RSU grant of 3,252 shares was awarded on December 8, 2023 and vests on December 8, 2026. All holdings are reported as direct ownership. The filing was signed by attorney-in-fact Alan M. Kidd on April 1, 2026.