X0303 4 2009-02-20 0000804212 AIRGAS INC ARG 0001237787 POWERS B SHAUN C/O AIRGAS, INC. 259 N. RADNOR-CHESTER RD, STE. 100 RADNOR PA 19087 0 1 0 0 Division President - East Common Stock 2009-02-20 4 M 0 15000 7.05 A 22635 D Common Stock 2009-02-20 4 S 0 15000 35.00 D 7635 D Stock Option (Right to Buy) 7.05 2009-02-20 4 M 0 15000 D 2011-03-28 Common Stock 15000 0 D Includes 7,635 shares of Airgas, Inc. common stock acquired pursuant to Airgas, Inc.'s Employee Stock Purchase Plan ("ESPP") as of 2/20/2009, the date of the latest available statement of the reporting person's ESPP holdings. Since 3/1/2007, the date of the statement relied upon for the amount reported on the reporting person's 3/5/2007 Form 4, a total of 1,216 ESPP shares have been acquired in transactions exempt from Section 16(b). Options became exercisable in 25% equal increments on each of 3/28/2002, 3/28/2003, 3/28/2004 and 3/28/2005. Not applicable. Robert H. Young, Jr., Attorney-in-Fact for B. Shaun Powers 2009-02-24