X0206 3 2021-04-30 0 0000007431 ARMSTRONG WORLD INDUSTRIES INC AWI 0001860013 Burge James T. C/O ARMSTRONG WORLD INDUSTRIES, INC. P. O. BOX 3001 LANCASTER PA 17603 1 Vice President & Controller Common Stock 315 D Restricted Stock Units Common Stock 54 D Restricted Stock Units Common Stock 119 D Restricted Stock Units Common Stock 255 D Each restricted stock unit represents a contingent right to receive one share of the Issuer's common stock under the Issuer's 2016 Long-Term Incentive Plan. The restricted stock units were granted to the Reporting Person on February 26, 2019 and will vest on the third anniversary of the grant (contingent upon the Reporting Person's employment with the Issuer on the scheduled vesting date, except as provided for under the Issuer's 2016 Long-Term Incentive Plan). The restricted stock units were granted to the Reporting Person on February 25, 2020 and will vest as follows: (1) 59 on the second anniversary of the grant, and (2) 60 on the third anniversary of the grant (contingent upon the Reporting Person's employment with the Issuer on the scheduled vesting date, except as provided for under the Issuer's 2016 Long-Term Incentive Plan). The restricted stock units were granted to the Reporting Person on February 24, 2021 and will vest as follows: (1) 85 on the first anniversary of the grant, (2) 85 on the second anniversary, and (3) 85 on the third anniversary of the grant (contingent upon the Reporting Person's employment with the Issuer on the scheduled vesting date, except as provided for under the Issuer's 2016 Long-Term Incentive Plan). See Exhibit 24 Power of Attorney /s/ Bryan Y.M. Tham, Attorney-in-fact 2021-05-04