SEC Form 4

FORM 4		UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940	OMB APPROVAL OMB Number: 3235-0287 Estimated average burden hours per response: 0.5
	Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

1. Name and Address of Reporting Person* MCCAUSLAND PETER (Last) (First) (Middle) C/O AIRGAS, INC. 259 N. RADNOR-CHESTER RD, STE. 100 (Street) RADNOR PA 19087 (City) (State) (Zip)	2. Issuer Name and Ticker or Trading Symbol AIRGAS INC [ ARG ]	5. Relationship of Reporting Person(s) to Issuer (Check all applicable) X Director X 10% Owner X Officer (give title below) Other (specify below) Executive Chariman
	3. Date of Earliest Transaction (Month/Day/Year) 10/24/2012
	4. If Amendment, Date of Original Filed (Month/Day/Year)	6. Individual or Joint/Group Filing (Check Applicable Line) Form filed by One Reporting Person X Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock	07/16/2012		G	V	109,784(1)	A	(2)	7,121,139(3)	D
Common Stock	10/24/2012		M		115,000	A	$19.22	7,236,139(3)	D
Common Stock	10/24/2012		M		115,000	A	$21.15	7,351,139(3)	D
Common Stock	10/24/2012		M		110,000	A	$24.09	7,461,139(3)	D
Common Stock	10/24/2012		M		100,000	A	$36.17	7,561,139(3)	D
Common Stock	10/24/2012		M		125,000	A	$43.62	7,686,139(3)	D
Common Stock	10/24/2012		M		125,000	A	$60.84	7,811,139(3)	D
Common Stock	10/24/2012		M		112,500	A	$43.06	7,923,639(3)	D
Common Stock	10/24/2012		M		55,000	A	$62.23	7,978,639(3)	D
Common Stock	10/24/2012		M		27,500	A	$66.5	8,006,139(3)	D
Common Stock	10/15/2012		G	V	136,216(4)	D	(2)	96,540(5)	I	By trusts
Common Stock								48,583(6)	I	By 401(k) plan
Common Stock								1,500(7)	I	By immediate family

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Stock Option (Right to Buy)	$19.22	10/24/2012		M			115,000	(8)	05/12/2013	Common Stock	115,000	(2)	0	D
Stock Option (Right to Buy)	$21.15	10/24/2012		M			115,000	(9)	05/25/2014	Common Stock	115,000	(2)	0	D
Stock Option (Right to Buy)	$24.09	10/24/2012		M			110,000	(10)	05/24/2015	Common Stock	110,000	(2)	0	D
Stock Option (Right to Buy)	$36.17	10/24/2012		M			100,000	(11)	05/23/2014	Common Stock	100,000	(2)	0	D
Stock Option (Right to Buy)	$43.62	10/24/2012		M			125,000	(12)	05/08/2015	Common Stock	125,000	(2)	0	D
Stock Option (Right to Buy)	$60.84	10/24/2012		M			125,000	(13)	05/20/2016	Common Stock	125,000	(2)	0	D
Stock Option (Right to Buy)	$43.06	10/24/2012		M			112,500	(14)	05/19/2017	Common Stock	112,500	(2)	37,500	D
Stock Option (Right to Buy)	$62.23	10/24/2012		M			55,000	(15)	05/25/2018	Common Stock	55,000	(2)	55,000	D
Stock Option (Right to Buy)	$66.5	10/24/2012		M			27,500	(16)	05/17/2019	Common Stock	27,500	(2)	82,500	D

1. Name and Address of Reporting Person* MCCAUSLAND PETER (Last) (First) (Middle) C/O AIRGAS, INC. 259 N. RADNOR-CHESTER RD, STE. 100 (Street) RADNOR PA 19087 (City) (State) (Zip) Relationship of Reporting Person(s) to Issuer X Director X 10% Owner X Officer (give title below) Other (specify below) Executive Chariman

1. Name and Address of Reporting Person* MCCAUSLAND BONNIE F (Last) (First) (Middle) ERDENHEIM FARM P.O. BOX 274 (Street) LAFAYETTE HILL PA 19444 (City) (State) (Zip) Relationship of Reporting Person(s) to Issuer Director X 10% Owner Officer (give title below) Other (specify below)

Explanation of Responses:

1. Represents shares of Airgas, Inc. common stock distributed to Peter McCausland and Bonnie McCausland (and held jointly) from two separate grantor retained annuity trusts (each, a "GRAT") of which Peter McCausland and Bonnie McCausland are co-trustees and either he or she is a beneficiary.

2. Not applicable.

3. Represents shares of Airgas, Inc. common stock, including shares issued upon the exercise of the stock options reported on Table II herein, jointly owned by Peter McCausland and Bonnie McCausland, except for 15,700 shares that are directly owned by Peter McCausland and indirectly owned by Bonnie McCausland.

4. Represents shares of Airgas, Inc. common stock transfered as a gift from two separate GRATs of which Peter McCausland and Bonnie McCausland are co-trustees and either he or she is a beneficiary.

5. Represents shares of Airgas, Inc. common stock held in two separate GRATs of which Peter McCausland and Bonnie McCausland are co-trustees and either he or she is a beneficiary.

6. The information presented is as of 10/24/2012, the date of the latest available statement of Peter McCausland's holdings of Airgas, Inc. common stock in his 401(k) plan. Since 3/31/2012, the date of the statement relied upon for the amount reported on Peter McCausland's Form 5 dated 5/14/2012, a total of 418 shares of common stock have been acquired in Peter McCausland's 401(k) plan through transactions exempt under Section 16(b).

7. Represents shares of Airgas, Inc. common stock owned directly by Bonnie McCausland and indirectly by Peter McCausland.

8. These options became exercisable in 25% equal increments on each of 5/12/2004, 5/12/2005, 5/12/2006 and 5/12/2007.

9. These options became exercisable in 25% equal increments on each of 5/25/2005, 5/25/2006, 5/25/2007 and 5/25/2008.

10. These options became exercisable in 25% equal increments on each of 5/24/2006, 5/24/2007, 5/24/2008 and 5/24/2009.

11. These options became exercisable in 25% equal increments on each of 5/23/2007, 5/23/2008, 5/23/2009 and 5/23/2010.

12. These options became exercisable in 25% equal increments on each of 5/8/2008, 5/8/2009, 5/8/2010 and 5/8/2011.

13. These options became exercisable in 25% equal increments on each of 5/20/2009, 5/20/2010, 5/20/2011 and 5/20/2012.

14. These options became or will become exercisable, as applicable, in 25% equal increments on each of 5/19/2010, 5/19/2011, 5/19/2012 and 5/19/2013.

15. These options became or will become exercisable, as applicable, in 25% equal increments on each of 5/25/2011, 5/25/2012, 5/25/2013 and 5/25/2014.

16. These options became or will become exercisable, as applicable, in 25% equal increments on each of 5/17/2012, 5/17/2013, 5/17/2014 and 5/17/2015.

Remarks:

	Robert H. Young, Jr., Attorney-in-Fact for Peter McCausland	10/26/2012
	Robert H. Young, Jr., Attorney-in-Fact for Bonnie F. McCausland	10/26/2012
	** Signature of Reporting Person	Date
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