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UNITED STATES
SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 13G

Under the Securities Exchange Act of 1934
(Amendment No. 15)*

AIRGAS, INC
(Name of Issuer)
COMMON STOCK
(Title of Class of Securities)
009363 10 2
(CUSIP Number)
December 31, 2005
(Date of Event Which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule is filed:

     o Rule 13d-1(b)

     o Rule 13d-1(c)

     þ Rule 13d-1(d)

* The remainder of this cover page shall be filled out for a reporting person’s initial filing on this form with respect to the subject class of securities, and for any subsequent amendment containing information which would alter the disclosures provided in a prior cover page.

The information required in the remainder of this cover page shall not be deemed to be “filed” for the purpose of Section 18 of the Securities Exchange Act of 1934 (“Act”) or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes).

 
 


 

                     
CUSIP No.
 
009363 10 2 
               

 

           
1   NAMES OF REPORTING PERSONS:
Peter McCausland
   
  I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY): 
   
     
2   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS):

  (a)   o
  (b)   þ
     
3   SEC USE ONLY:
   
   
     
4   CITIZENSHIP OR PLACE OF ORGANIZATION:
   
  United States
       
  5   SOLE VOTING POWER:
     
NUMBER OF   927,574
       
SHARES 6   SHARED VOTING POWER:
BENEFICIALLY    
OWNED BY   7,179,071
       
EACH 7   SOLE DISPOSITIVE POWER:
REPORTING    
PERSON   927,574
       
WITH: 8   SHARED DISPOSITIVE POWER:
     
    7,179,071
     
9   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON:
   
  8,106,645
     
10   CHECK IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES (SEE INSTRUCTIONS):
   
  o
     
11   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9):
   
  10.4%
     
12   TYPE OF REPORTING PERSON (SEE INSTRUCTIONS):
   
  IN

 


 

       
Item 1(a)
  Name of Issuer
 
   
 
  Airgas, Inc.
 
   
Item 1(b)
  Address of Issuer’s Principal Executive Offices
 
   
 
  Airgas, Inc.
 
  Radnor Court
 
  259 North Radnor-Chester Road, Suite 100
 
  Radnor, Pennsylvania 19087-5283
 
   
Item 2(a)
  Name of Person Filing
 
   
 
  Peter McCausland
 
   
Item 2(b)
  Address of Principal Business Office, or, if none, Residence
 
   
 
  Airgas, Inc.
 
  Radnor Court
 
  259 North Radnor-Chester Road, Suite 100
 
  Radnor, Pennsylvania 19087-5283
 
   
Item 2(c)
  Citizenship
 
   
 
  United States
 
   
Item 2(d)
  Title of Class of Securities
 
   
 
  Common Stock, par value $0.01 per share
 
   
Item 2(e)
  CUSIP Number
 
   
 
  009363 10 2

 


 

             
Item 3   If This Statement is Filed Pursuant to Rule 13d-1(b), or 13d-2(b) or (c), Check Whether the Person Filing is a:
 
           
 
  (a)   ___   Broker or dealer registered under Section 15 of the Exchange Act;
 
           
 
  (b)   ___   Bank as defined in Section 3(a)(6) of the Exchange Act;
 
           
 
  (c)   ___   Insurance company as defined in Section 3(a)(19) of the Exchange Act;
 
           
 
  (d)   ___   Investment company registered under Section 8 of the Investment Company Act;
 
           
 
  (e)   ___   An investment adviser in accordance with Rule 13d-1(b)(1)(ii)(E);
 
           
 
  (f)   ___   An employee benefit plan or endowment fund in accordance with Rule 13d-1(b)(1)(ii)(F);
 
           
 
  (g)   ___   A parent holding company or control person in accordance with Rule 13d-1(b)(1)(ii)(G);
 
           
 
  (h)   ___   A savings association as defined in Section 3(b) of the Federal Deposit Insurance Act;
 
           
 
  (i)   ___   A church plan that is excluded from the definition of an investment company under Section 3(c)(14) of the Investment Company Act;
 
           
 
  (j)   ___   Group, in accordance with Rule 13d-1(b)(1)(ii)(J).
 
   
Item 4   Ownership    
 
         
     (a) and (b). Peter McCausland beneficially owned an aggregate of 8,106,645 shares of the issuer’s Common Stock, or approximately 10.4% of the shares outstanding, as of December 31, 2005, of which 870,000 shares were issuable upon exercise of employee stock options.
     (c). Peter McCausland had sole power to vote or to direct the vote, and sole power to dispose or to direct the disposition of, 927,574 shares of the issuer’s Common Stock, of which 870,000 shares were issuable upon exercise of employee stock options. Mr. McCausland had shared power to vote or to direct the vote, and/or shared power to dispose or to direct the disposition of, 7,179,071 shares of the Common Stock, which included 38,170 shares held by a charitable foundation (the “Foundation”) of which Mr. McCausland is an officer and director.

 


 

     
Item 5
  Ownership of Five Percent or Less of a Class
 
   
 
 
 
 
  Not applicable
 
   
Item 6
  Ownership of More than Five Percent on Behalf of Another Person
 
   
 
   
          No other person is known to have the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of, the issuer’s shares which are the subject of this Schedule 13G, except that, with respect to 7,140,901 shares, members of Mr. McCausland’s family share with Mr. McCausland the right, and, with respect to 38,170 shares, the Foundation has the exclusive right, to receive the dividends from and the proceeds of sale as to such shares.
     
Item 7
  Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on By the Parent Holding Company
 
   
 
   
 
   
 
  Not Applicable
 
   
Item 8
  Identification and Classification of Members of the Group
 
   
 
 
 
 
   
 
  Not Applicable
 
   
Item 9
  Notice of Dissolution of Group
 
   
 
 
 
 
   
 
  Not Applicable
 
   
Item 10
  Certification
 
   
 
 
 
 
   
 
  Not Applicable

 


 

SIGNATURE
     After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.
Date: February 14, 2006
/s/ Peter McCausland
Peter McCausland