X0202 5 2006-03-31 1 0 0 0000804212 AIRGAS INC ARG 0001237781 KEEN GORDON L JR C/O AIRGAS, INC. 259 N. RADNOR-CHESTER ROAD, STE. 100 RADNOR PA 19087 0 1 0 0 SVP - Law & Corp. Development Common Stock 2005-12-13 5 G 0 1030 D 157790 D Common Stock 2005-12-14 5 G 0 20 D 157770 D Common Stock 3513 I By 401(k) Plan Common Stock 8000 I By Immediate Family Not applicable. Includes 8,706 shares of Airgas, Inc. common stock acquired pursuant to Airgas, Inc.'s Employee Stock Purchase Plan ("ESPP") as of 3/31/2006, the date of the latest available statement of the reporting person's ESPP holdings. Since 3/09/2005, the date of the statement relied upon for the amount reported on the reporting person's 3/10/2005 Form 4, a total of 486 shares have been acquired in transactions exempt from Section 16(b) pursuant to Rule 16b-3(c). The information presented is as of 3/31/2006, the date of the latest available statement of the reporting person's holdings of Airgas, Inc. common stock in his 401(k) Plan. Since 3/9/2005, the date of the statement relied upon for the amount reported on the reporting person's 3/10/2005 Form 4, a total of 166 shares have been acquired in transactions exempt from Section 16(b) pursuant to Rule 16b-3(c). Gordon L. Keen, Jr. 2006-05-11