X0306 4 2014-02-20 0 0000007431 ARMSTRONG WORLD INDUSTRIES INC AWI 0001192868 ESPE MATTHEW J C/O ARMSTRONG WORLD INDUSTRIES, INC. 2500 COLUMBIA AVENUE LANCASTER PA 17603 1 1 0 0 President and CEO Common Stock 2014-02-20 4 M 0 16495 0.00 A 57898 D Common Stock 2014-02-20 4 F 0 5189 59.44 D 52709 D Restricted Stock Units 2014-02-20 4 A 0 16495 0.00 A Common Stock 16495 16495 D Reflects the conversion of previously granted restricted stock units into shares of Issuer's common stock in connection with the vesting of the restricted stock units. Each restricted stock unit represents a contingent right to receive one share of Issuer's common stock. Represents the number of shares withheld by the Issuer to satisfy the Reporting Person's tax obligations upon the vesting of restricted stock units granted to the Reporting Person under the Issuer's 2006 Long-Term Incentive Plan. Each restricted stock unit represents a contingent right to receive one share of Issuer's common stock. The restricted stock units were granted upon achievement of certain performance objectives pursuant to the performance-based restricted stock units granted on March 2, 2011 under the Issuer's 2006 Long-Term Incentive Plan. The performance period for the restricted stock units was January 1, 2011 to December 31, 2013, 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 20, 2014. Not applicable. /s/Christopher S. Parisi, Attorney-in-fact 2014-02-24