FORM 4
[ ] Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).         
UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES
                                                                                  
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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(f) of the Investment Company Act of 1940
                      

1. Name and Address of Reporting Person *

Knebel David E
2. Issuer Name and Ticker or Trading Symbol

AAON INC [ AAON ]
5. Relationship of Reporting Person(s) to Issuer (Check all applicable)

_____ Director                      _____ 10% Owner
__ X __ Officer (give title below)      _____ Other (specify below)
Vice President, Sales & Techno
(Last)          (First)          (Middle)

2425 SOUTH YUKON AVENUE
3. Date of Earliest Transaction (MM/DD/YYYY)

5/15/2012
(Street)

TULSA, OK 74107-2728
(City)        (State)        (Zip)
4. If Amendment, Date Original Filed (MM/DD/YYYY)

 
6. Individual or Joint/Group Filing (Check Applicable Line)

_ X _ Form filed by One Reporting Person
___ 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. Trans. Date 2A. Deemed Execution Date, if any 3. Trans. 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, par value $.004                  49600   D    
Common Stock, par value $.004                  4471   I   401(k) Plan  

Table II - Derivative Securities Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities)
1. Title of Derivate Security
(Instr. 3)
2. Conversion or Exercise Price of Derivative Security 3. Trans. Date 3A. Deemed Execution Date, if any 4. Trans. 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 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 of Derivative Security: 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   $6.45                    2/21/2004   2/21/2013   Common Stock   10000     1   D    
Stock Option   $7.21                    4/6/2006   4/6/2015   Common Stock   11250     1   D    
Stock Option   $12.29                    5/8/2007   5/8/2016   Common Stock   22500     1   D    
Stock Option   $11.31                    3/10/2009   3/10/2018   Common Stock   4500     1   D    
Stock Option   $10.23                    10/17/2009   10/17/2018   Common Stock   15000     1   D    
Stock Option   $10.21                    3/9/2010   3/9/2019   Common Stock   7500     1   D    
Stock Option   $15.51                    5/25/2011   5/25/2020   Common Stock   15000     1   D    
Stock Option   $19.47   5/15/2012     A      1       5/15/2013   5/15/2022   Common Stock   10000   $0   1   D    

Explanation of Responses:

Reporting Owners
Reporting Owner Name / Address
Relationships
Director 10% Owner Officer Other
Knebel David E
2425 SOUTH YUKON AVENUE
TULSA, OK 74107-2728


Vice President, Sales & Techno

Signatures
David E. Knebel 5/16/2012
** Signature of Reporting Person Date


Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4(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).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB control number.
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