X0306 4 2016-02-05 0 0000007431 ARMSTRONG WORLD INDUSTRIES INC AWI 0001322386 Hershey Mark A C/O ARMSTRONG WORLD INDUSTRIES, INC. 2500 COLUMBIA AVE LANCASTER PA 17603 0 1 0 0 SVP, GenCnsl, Compliance Common Stock 2016-02-05 4 M 0 2437 0.00 A 8004 D Common Stock 2016-02-05 4 F 0 845 39.10 D 7159 D Performance Restricted Stock Units 2016-02-05 4 A 0 2437 0.00 A Common Stock 2437 2437 D Reflects the conversion of previously granted performance restricted stock units into shares of the Issuer's common stock in connection with the vesting of the units based on underlying performance metrics. Represents the number of shares withheld by the Issuer to satisfy the Reporting Person's tax obligations upon the vesting of performance restricted stock units granted to the Reporting Person under the Issuer's Long-Term Incentive Plan. Each performance restricted stock unit represents a contingent right to receive one share of Issuer's common stock. The performance restricted stock units were granted upon achievement of certain performance metrics pursuant to the performance-based restricted stock units granted on February 20, 2013 under the Company's Long-Term Incentive Plan. The performance period for the performance restricted stock units was January 1, 2013 to December 31, 2015, with vesting subject to approval of the performance calculation by the Management Development and Compensation Committee of the Issuer's Board of Directors. This approval was obtained on February 5, 2016. Not applicable. /s/Christopher S. Parisi, Attorney-in-fact 2016-02-09