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 or Section 30(h) of the Investment Company Act of 1940
                      
1. Name and Address of Reporting Person * Fields Gary D 2. Issuer Name and Ticker or Trading Symbol AAON, INC. [ AAON ] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable)__X__ Director                    _____ 10% Owner
__X__ Officer (give title below)    _____ Other (specify below)
President and CEO
(Last)         (First)         (Middle)
2425 S. YUKON
3. Date of Earliest Transaction (MM/DD/YYYY)
3/11/2021
(Street)
TULSA, OK 74107
(City)       (State)       (Zip)
4. If Amendment, Date Original Filed (MM/DD/YYYY)
3/15/2021 
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  3/11/2021    F    454  D $73.36  29486  D   
Common Stock, par value $.004  3/11/2021    A    4524 (1) A $0  34010  D   
Common Stock, par value $.004  3/16/2021    F    32 (2) D $64.24  33978  D   
Common Stock, par value $.004                 1500  I  Custodian for the benefit of his grandchildren 
Common Stock, par value $.004                 2529  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)  $32.7                  12/1/2017  12/1/2026  Common Stock  1389.0    1389  D   
Stock Option (Right to Buy)  $34.1                  1/4/2018  1/4/2027  Common Stock  7470.0    7470  D   
Stock Option (Right to Buy)  $36.95                  1/2/2019  1/2/2028  Common Stock  37393.0    37393  D   
Stock Option (Right to Buy)  $41.37                  3/11/2020  3/11/2029  Common Stock  94000.0    94000  D   
Stock Option (Right to Buy)  $44.22                  3/11/2021  3/11/2030  Common Stock  43040.0    43040  D   
Stock Option (Right to Buy)  $47.54                  5/12/2021  5/12/2030  Common Stock  39300.0    39300  D   
Stock Option (Right to Buy)  $73.36                  3/11/2022  3/11/2031  Common Stock  31461.0 (1)   31461  D   

Explanation of Responses:
(1)  This stock award is granted under the Issuer's 2016 Long Term Incentive Plan and vests or is exercisable ratably on each of the first three anniversaries of the date of the grant.
(2)  The original Form 4, filed on March 15, 2021, is being amended by this Form 4 amendment, solely to disclose an administrative error, which did not report a sale that occurred on December 1, 2020 for a total of 32 shares (at $64.24 per share). The number of shares presented above represents the current shares beneficially owned by the reporting person.

Reporting Owners
Reporting Owner Name / Address
Relationships
Director 10% Owner Officer Other
Fields Gary D
2425 S. YUKON
TULSA, OK 74107
X
President and CEO

Signatures
Gary D. Fields 3/16/2021
**Signature of Reporting Person Date
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