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 |