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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OMB Number: 3235-0287
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Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940
                      
1. Name and Address of Reporting Person * Crews Mikel D 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 of Operations
(Last)          (First)          (Middle)
2425 SOUTH YUKON
3. Date of Earliest Transaction (MM/DD/YYYY)
3/31/2019
(Street)
TULSA, OK 74107
(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   3/31/2019     F    15   D $46.18   20266   D    
Common Stock, par value $.004                  42637   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 (Right to Buy)   $7.18                    9/6/2012   9/6/2021   Common Stock   2250.0     2250   D    
Stock Option (Right to Buy)   $8.65                    5/15/2013   5/15/2022   Common Stock   1350.0     1350   D    
Stock Option (Right to Buy)   $22.15                    1/4/2017   1/4/2026   Common Stock   3190.0     3190   D    
Stock Option (Right to Buy)   $34.1                    1/4/2018   1/4/2027   Common Stock   27150.0     27150   D    
Stock Option (Right to Buy)   $34.15                    2/27/2018   2/27/2027   Common Stock   3345.0     3345   D    
Stock Option (Right to Buy)   $36.95                    1/2/2019   1/2/2028   Common Stock   31600.0     31600   D    
Stock Option (Right to Buy)   $41.37                    3/11/2020   3/11/2029   Common Stock   60000.0     60000   D    

Explanation of Responses:

Reporting Owners
Reporting Owner Name / Address
Relationships
Director 10% Owner Officer Other
Crews Mikel D
2425 SOUTH YUKON
TULSA, OK 74107


Vice President of Operations

Signatures
Mikel D. Crews 4/1/2019
** 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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