EX-21 8 awi-ex21.htm EX-21

Exhibit No. 21

Subsidiaries of Armstrong World Industries, Inc.

December 31, 2025

The following is a list of subsidiaries of Armstrong World Industries, Inc., omitting certain subsidiaries, which, when considered in the aggregate as a single subsidiary, would not constitute a significant subsidiary.

U.S. Subsidiaries | Jurisdiction of Incorporation
3form, LLC | Delaware
Architectural Components Group, Inc. | Delaware
Arktura LLC | Delaware
Armstrong Cork Finance LLC | Delaware
Armstrong Ventures, Inc. | Delaware
Armstrong World Industries (Delaware) LLC | Delaware
Armstrong World Industries Canada Ltd. | Canada
AWI Licensing Company | Delaware
Tectum, Inc. | Delaware
Turf Design, Inc. | Illinois