X0305 4 2012-04-10 0 0000007431 ARMSTRONG WORLD INDUSTRIES INC AWI 0001509566 Grizzle Victor C/O ARMSTRONG WORLD INDUSTRIES, INC. 2500 COLUMBIA AVE LANCASTER PA 17603 0 1 0 0 Executive V.P., Armstrong Bdg Stock Options 42.65 2012-04-10 4 D 0 4795 D 2012-01-17 2021-01-17 Common Stock 4795 0 D Stock Options 36.58 2012-04-10 4 A 0 5591 A 2012-01-17 2021-01-17 Common Stock 5591 5591 D Stock Options 42.65 2012-04-10 4 D 0 4795 D 2013-01-17 2021-01-17 Common Stock 4795 0 D Stock Options 36.58 2012-04-10 4 A 0 5591 A 2013-01-17 2021-01-17 Common Stock 5591 5591 D Stock Options 42.65 2012-04-10 4 D 0 4795 D 2014-01-17 2021-01-17 Common Stock 4795 0 D Stock Options 36.58 2012-04-10 4 A 0 5591 A 2014-01-17 2021-01-17 Common Stock 5591 5591 D Stock Options 41.47 2012-04-10 4 D 0 7808 D 2012-03-02 2021-03-02 Common Stock 7808 0 D Stock Options 35.57 2012-04-10 4 A 0 9105 A 2012-03-02 2021-03-02 Common Stock 9105 9105 D Stock Options 41.47 2012-04-10 4 D 0 7808 D 2013-03-02 2021-03-02 Common Stock 7808 0 D Stock Options 35.57 2012-04-10 4 A 0 9105 A 2013-03-02 2021-03-02 Common Stock 9105 9105 D Stock Options 41.47 2012-04-10 4 D 0 7808 D 2014-03-02 2021-03-02 Common Stock 7808 0 D Stock Options 35.57 2012-04-10 4 A 0 9105 A 2014-03-02 2021-03-02 Common Stock 9105 9105 D Stock Options 50.38 2012-04-10 4 D 0 7845 D 2013-02-28 2022-02-28 Common Stock 7845 0 D Stock Options 43.21 2012-04-10 4 A 0 9148 A 2013-02-28 2022-02-28 Common Stock 9148 9148 D Stock Options 50.38 2012-04-10 4 D 0 7845 D 2014-02-28 2022-02-28 Common Stock 7845 0 D Stock Options 43.21 2012-04-10 4 A 0 9148 A 2014-02-28 2022-02-28 Common Stock 9148 9148 D Stock Options 50.38 2012-04-10 4 D 0 7846 D 2015-02-28 2022-02-28 Common Stock 7846 0 D Stock Options 43.21 2012-04-10 4 A 0 9149 A 2015-02-28 2022-02-28 Common Stock 9149 9149 D The reported transactions relate to an adjustment of outstanding stock options and exercise prices in connection with the Registrant's payment of a special cash dividend to shareholders on April 10, 2012, resulting in the deemed cancellation of the original options and the grant of replacement options. An adjustment is required under the terms of the underlying equity incentive plan. /s/Robert J. Sandkuhler, Attorney-in-fact 2012-04-12