X0306 4/A 2015-08-18 2015-08-20 0000804212 AIRGAS INC ARG 0001237784 MCLAUGHLIN ROBERT M C/O AIRGAS, INC. 259 N. RADNOR-CHESTER ROAD, SUITE 100 RADNOR PA 19087 0 1 0 0 Senior VP and CFO Common Stock 2015-08-18 4 S 0 23500 106.16 D 30338 D This Amendment to the Form 4 filed by the Reporting Person on 8/20/15, is being filed to correct the Table 1-Item 2 disclosure reported therein to indicate that the average price per share of the shares sold by the Reporting Person in the reported transaction was $106.16, rather than $108.67 This price represents the average selling price (within a range of $105.99-$106.47) of the shares of common stock of Airgas, Inc. sold by the reporting person, as provided by the reporting person's broker. Includes 2,228 shares of Airgas, Inc. common stock acquired by the reporting person pursuant to Airgas, Inc.'s Employee Stock Purchase Plan ("ESPP") and held in his ESPP account as of 8/18/2015, the date of the latest available statement of the reporting person's ESPP holdings. Since 8/6/2014, the date of the statement relied upon for the amount reported on the reporting person's 8/8/2014 Form 4, a total of 202 ESPP shares have been acquired in transactions exempt from Section 16(b). Robert H. Young, Jr., Attorney-In-Fact for Robert M. McLaughlin 2015-08-20