Armstrong World Industries(AWI) - 2021 Q3 - Quarterly Report

UNITEDSTATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 10-Q (Mark One) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2021 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number: 1-2116 ARMSTRONG WORLD INDUSTRIES, INC. (Exact Name of Registrant as Specified in its Charter) Pennsylvania 23-0366390 (State or o ...