X0303 4 2011-05-09 0000804212 AIRGAS INC ARG 0001237787 POWERS B SHAUN C/O AIRGAS, INC. 259 N. RADNOR-CHESTER ROAD, SUITE 100 RADNOR PA 19087 0 1 0 0 Division President - East Common Stock 2011-05-09 4 M 0 11000 16.52 A 20014 D Common Stock 2011-05-09 4 S 0 11000 68.11 D 9014 D Stock Option (Right to Buy) 16.52 2011-05-09 4 M 0 11000 D 2012-05-06 Common Stock 11000 11500 D Includes 9,104 shares of Airgas, Inc. common stock acquired pursuant to Airgas, Inc.'s Employee Stock Purchase Plan ("ESPP") as of 5/10/2011, the date of the latest available statement of the reporting person's ESPP holdings. Since 2/20/2009, the date of the statement relied upon for the amount reported on the reporting person's 2/24/2009 Form 4, a total of 1,379 ESPP shares have been acquired in transactions exempt from Section 16(b). This price represents the average selling price (within a range of $68.05-$68.16) of the shares of common stock of Airgas, Inc. sold by the reporting person, as provided by the reporting person's broker. These options became exercisable in 25% equal increments on each of 5/6/2003, 5/6/2004, 5/6/2005 and 5/6/2006. Not Applicable. Robert H. Young, Jr., Attorney-In-Fact for B. Shaun Powers 2011-05-11