Sec Form 4 Filing - Fields Gary D @ AAON, INC. - 2021-03-02

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 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(h) of the Investment Company Act of 1940

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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/YY) 03/02/2021 (Street) TULSA, OK74107 4. If Amendment, Date Original Filed (MM/DD/YY) 6. Individual or Joint/Group Filing (Check Applicable Line) __ X __ Form filed by One Reporting Person _____ Form filed by More than One Reporting Person (City) (State) (Zip)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned 1.Title of Security (Instr. 3) 2. Transaction Date (MM/DD/YY) 2A. Deemed Execution Date, if any (MM/DD/YY) 3. Transaction 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 03/02/2021 M 2,778 A $ 32.7 32,718 D Common Stock, par value $.004 03/02/2021 M 14,940 A $ 34.1 47,658 D Common Stock, par value $.004 03/02/2021 M 6,090 A $ 36.95 53,748 D Common Stock, par value $.004 03/02/2021 S 23,808 D $ 75.15 ( 1 ) 29,940 D Common Stock, par value $.004 03/03/2021 M 7,157 A $ 36.95 37,097 D Common Stock, par value $.004 03/03/2021 S 7,157 D $ 75.08 ( 2 ) 29,940 D Common Stock, par value $.004 1,500 I Custodian for the benefit of his grandchildren Common Stock, par value $.004 2,497 I 401(k) Plan

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities) 1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (MM/DD/YY) 3A. Deemed Execution Date, if any (MM/DD/YY) 4. Transaction 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 (MM/DD/YY) 7. Title and Amount of Underlying Securities (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 03/02/2021 M 2,778 12/01/2017 12/01/2026 Common Stock 2,778 $ 75.15 ( 1 ) 1,389 D Stock Option (Right to Buy) $ 34.1 03/02/2021 M 14,940 01/04/2018 01/04/2027 Common Stock 14,940 $ 75.15 ( 1 ) 7,470 D Stock Option (Right to Buy) $ 36.95 03/02/2021 M 6,090 01/02/2019 01/02/2028 Common Stock 6,090 $ 75.15 ( 1 ) 44,550 D Stock Option (Right to Buy) $ 36.95 03/03/2021 M 7,157 01/02/2019 01/02/2028 Common Stock 7,157 $ 75.08 ( 2 ) 37,393 D Stock Option (Right to Buy) $ 41.37 03/11/2020 03/11/2029 Common Stock 94,000 94,000 D Stock Option (Right to Buy) $ 44.22 03/11/2021 03/11/2030 Common Stock 43,040 43,040 D Stock Option (Right to Buy) $ 47.54 05/12/2021 05/12/2030 Common Stock 39,300 39,300 D

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other Fields Gary D 2425 S. YUKON TULSA, OK74107 X President and CEO Signatures Gary D. Fields 03/04/2021 Signature of Reporting Person Date

Explanation of Responses:

( 1 )This transaction was executed in multiple trades at prices ranging from $75.00 to $76.71. The price reported above reflects the weighted average sales price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected. ( 2 )This transaction was executed in multiple trades at prices ranging from $75.00 to $75.48. The price reported above reflects the weighted average sales price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected.

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).

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