X0202 4 2005-03-09 0000804212 AIRGAS INC ARG 0001237781 KEEN GORDON L JR C/O AIRGAS, INC. 259 N. RADNOR-CHESTER ROAD, SUITE 100 RADNOR PA 19087 0 1 0 0 Sr. VP of Law and Corp. Dev. Common Stock 2005-03-09 4 M 0 10000 13.32 A 323820 D Common Stock 2005-03-09 4 M 0 10000 17.31 A 333820 D Common Stock 2005-03-09 4 S 0 20000 26.0353 D 313820 D Common Stock 3347 I 410(k) Plan Common Stock 8000 I Immediate Family Stock Option (Right to Buy) 13.32 2005-03-09 4 M 0 10000 D 2005-05-22 Common Stock 10000 0 D Stock Option (Right to Buy) 17.31 2005-03-09 4 M 0 10000 D 2005-05-22 Common Stock 10000 0 D Includes 8,220 shares of Airgas, Inc. common stock acquired pursuant to Airgas, Inc.'s Employee Stock Purchase Plan ("ESPP") as of 3/09/2005, the date of the latest available statement of the reporting person's ESPP holdings. Since 3/31/2004, the date of the statement relied upon for the amount reported on the reporting person's 5/13/2004 Form 4, a total of 512 shares have been acquired in transactions exempt from Section 16(b) pursuant to Rule 16b-3(c). The information presented is as of 3/09/2005, the date of the latest available statement of the reporting person's holdings of Airgas, Inc. common stock in his 401(k) Plan. Since 3/31/2004, the date of the statement relied upon for the amount reported on the reporting person's 5/13/2004 Form 4, a total of 227 shares have been acquired in transactions exempt from Section 16(b) pursuant to Rule 16b-3(c). Not applicable. The options vested in four equal annual installments on 5/22/1996, 5/22/1997, 5/22/1998, and 5/22/1999. Gordon L. Keen, Jr. 2005-03-10