Ownership Submission
FORM 3
 UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940
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(Print or Type Responses)
1. Name and Address of Reporting Person *
  Stark Ronald J
 2. Date of Event Requiring Statement (Month/Day/Year)
07/01/2011		 3. Issuer Name and Ticker or Trading Symbol
AIRGAS INC [ARG]
(Last)
(First)
(Middle)
C/O AIRGAS, INC., 259 N. RADNOR-CHESTER ROAD, SUITE 100		 4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
_____ Director _____ 10% Owner
__X__ Officer (give title below) _____ Other (specify below)
SVP - Sales & Marketing
 5. If Amendment, Date Original Filed(Month/Day/Year)
(Street)

RADNOR, PA 19087		 6. Individual or Joint/Group Filing(Check Applicable Line)
_X_ Form filed by One Reporting Person
___ Form filed by More than One Reporting Person
(City)
(State)
(Zip)
Table I - Non-Derivative Securities Beneficially Owned
1.Title of Security
(Instr. 4)		 2. Amount of Securities Beneficially Owned
(Instr. 4)		 3. Ownership Form: Direct (D) or Indirect (I)
(Instr. 5)		 4. Nature of Indirect Beneficial Ownership
(Instr. 5)
Common Stock 4,832 (1)
D
 

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly. SEC 1473 (7-02)
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Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security
(Instr. 4)		 2. Date Exercisable and Expiration Date
(Month/Day/Year)		 3. Title and Amount of Securities Underlying Derivative Security
(Instr. 4)		 4. Conversion or Exercise Price of Derivative Security 5. Ownership Form of Derivative Security: Direct (D) or Indirect (I)
(Instr. 5)		 6. Nature of Indirect Beneficial Ownership
(Instr. 5)
Date Exercisable Expiration Date Title Amount or Number of Shares
Stock Option (Right to Buy)   (2) 05/08/2015 Common Stock 10,300 $ 43.62 D  
Stock Option (Right to Buy)   (3) 05/20/2016 Common Stock 11,000 $ 60.84 D  
Stock Option (Right to Buy)   (4) 05/19/2017 Common Stock 12,800 $ 43.06 D  
Stock Option (Right to Buy)   (5) 05/25/2018 Common Stock 12,100 $ 62.23 D  
Stock Option (Right to Buy)   (6) 05/17/2019 Common Stock 13,500 $ 66.5 D  

Reporting Owners

Reporting Owner Name / Address Relationships
Director 10% Owner Officer Other
Stark Ronald J
C/O AIRGAS, INC.
259 N. RADNOR-CHESTER ROAD, SUITE 100
RADNOR, PA 19087		       SVP - Sales & Marketing  

Signatures

Robert H. Young, Jr., Attorney-in-Fact for Ronald J. Stark 11/30/2011
**Signature of Reporting Person Date

Explanation of Responses:

* If the form is filed by more than one reporting person, see Instruction 5(b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
(1) Includes 1,557 shares of Airgas, Inc. common stock acquired pursuant to Airgas, Inc.'s Employee Stock Purchase Plan ("ESPP") as of 11/14/2011, the date of the latest available statement of the reporting person's ESPP holdings.
(2) These options became exercisable in 25% annual increments on each of 5/8/2008, 5/8/2009, 5/8/2010 and 5/8/2011.
(3) These options have or will become exercisable, as applicable, in 25% annual increments on each of 5/20/2009, 5/20/2010, 5/20/2011 and 5/20/2012.
(4) These options have 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.
(5) These options have 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.
(6) These options will become exercisable in 25% annual increments on each of 5/17/2012, 5/17/2013, 5/17/2014 and 5/17/2015.

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