FORM 3
        
UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

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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 * Eason Christopher Douglas 2. Date of Event Requiring Statement (MM/DD/YYYY)
5/11/2021 

3. Issuer Name and Ticker or Trading Symbol AAON, INC. [AAON]
(Last)       (First)       (Middle)
2425 S YUKON AVE
4. Relationship of Reporting Person(s) to Issuer (Check all applicable)_____ Director                          _____ 10% Owner
___X___ Officer (give title below)        _____ Other (specify below)
Chief Accounting Officer /
(Street)
TULSA, OK 74107      
(City)             (State)             (Zip)
5. 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 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, par value $.004  1269 (1) D   
Common Stock, par value $.004  254  I  401(k) Plan 

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivate Security
(Instr. 4)
2. Date Exercisable and Expiration Date
(MM/DD/YYYY)
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)  3/11/2021  3/11/2030  Common Stock  200.0  $44.22  D   
Stock Option (Right to Buy)  3/11/2022  3/11/2031  Common Stock  366.0  $73.36  D   
Stock Option (Right to Buy)  5/11/2022  5/11/2031  Common Stock  4821.0 (2) $65.24  D   

Explanation of Responses:
(1)  Total amount includes a restricted stock award of 330 shares granted under the Issuer's 2016 Long Term Incentive Plan which vests ratably on each of the first three anniversaries of the date of the grant (date of grant, May 11, 2021).
(2)  This stock option award is granted under the Issuer's 2016 Long Term Incentive Plan and is exercisable ratably on each of the first three anniversaries of the date of the grant (date of grant, May 11, 2021).

Reporting Owners
Reporting Owner Name / Address
Relationships
Director 10% Owner Officer Other
Eason Christopher Douglas
2425 S YUKON AVE
TULSA, OK 74107


Chief Accounting Officer

Signatures
Christopher D Eason 5/21/2021
**Signature of Reporting Person Date
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