X0306 4 2012-12-17 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 - North Common Stock 2012-12-17 4 M 0 20800 19.22 A 30286 D Common Stock 2012-12-17 4 M 0 18000 21.15 A 48286 D Common Stock 2012-12-17 4 M 0 16900 24.09 A 65186 D Common Stock 2012-12-17 4 M 0 15800 36.17 A 80986 D Common Stock 2012-12-17 4 M 0 15800 43.62 A 96786 D Common Stock 2012-12-17 4 S 0 52583 89.05 D 44203 D Stock Option (Right to Buy) 19.22 2012-12-17 4 M 0 20800 D 2013-05-12 Common Stock 20800 0 D Stock Option (Right to Buy) 21.15 2012-12-17 4 M 0 18000 D 2014-05-25 Common Stock 18000 0 D Stock Option (Right to Buy) 24.09 2012-12-17 4 M 0 16900 D 2015-05-24 Common Stock 16900 0 D Stock Option (Right to Buy) 36.17 2012-12-17 4 M 0 15800 D 2014-05-23 Common Stock 15800 0 D Stock Option (Right to Buy) 43.62 2012-12-17 4 M 0 15800 D 2015-05-08 Common Stock 15800 0 D Includes 9,486 shares of Airgas, Inc. common stock acquired pursuant to Airgas, Inc.'s Employee Stock Purchase Plan ("ESPP") as of 12/17/2012, the date of the latest available statement of the reporting person's ESPP holdings. Since 2/23/2012, the date of the statement relied upon for the amount reported on the reporting person's 2/27/2012 Form 4, a total of 231 ESPP shares have been acquired in transactions exempt from Section 16(b). This price represents the average selling price (within a range of $89.00-$89.29) 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 5/12/2004, 5/12/2005, 5/12/2006 and 5/12/2007. Not Applicable. These options became exercisable in 25% equal increments on each of 5/25/2005, 5/25/2006, 5/25/2007 and 5/25/2008. These options became exercisable in 25% equal increments on each of 5/24/2006, 5/24/2007, 5/24/2008 and 5/24/2009. These options became exercisable in 25% equal increments on each of 5/23/2007, 5/23/2008, 5/23/2009 and 5/23/2010. These options became exercisable in 25% equal increments on each of 5/08/2008, 5/08/2009, 5/08/2010 and 5/08/2011. Robert H. Young, Jr., Attorney-In-Fact for B. Shaun Powers 2012-12-18