Sec Form 3 Filing - Purtell Stephen @ Six Flags Entertainment Corp - 2022-03-28

FORM 3 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 Purtell Stephen 2. Issuer Name and Ticker or Trading Symbol Six Flags Entertainment Corp [ SIX] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director _____ 10% Owner X __ Officer (give title below) _____ Other (specify below) Interim CFO (Last) (First) (Middle) C/O SIX FLAGS ENTERTAINMENT CORPORATION, 1000 BALLPARK WAY, SUITE 400 3. Date of Earliest Transaction (MM/DD/YY) 03/28/2022 (Street) ARLINGTON, TX76011 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 $0.025 per share 34,964 D

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 Employee Stock Option (Right to Buy) $ 42.34 08/24/2019 08/24/2025 Common Stock, par value $0.025 per share 2,000 D Employee Stock Option (Right to Buy) $ 50.39 08/24/2020 08/24/2026 Common Stock, par value $0.025 per share 3,750 D Employee Stock Option (Right to Buy) $ 60.06 01/03/2021 01/03/2027 Common Stock, par value $0.025 per share 1,500 D Employee Stock Option (Right to Buy) $ 60.8 02/08/2021 02/08/2027 Common Stock, par value $0.025 per share 3,000 D Employee Stock Option (Right to Buy) $ 53.12 08/30/2021 08/30/2027 Common Stock, par value $0.025 per share 12,000 D Employee Stock Option (Right to Buy) $ 65.27 ( 1 ) 08/30/2028 Common Stock, par value $0.025 per share 15,000 D Employee Stock Option (Right to Buy) $ 59.17 ( 2 ) 08/30/2029 Common Stock, par value $0.025 per share 25,000 D

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other Purtell Stephen C/O SIX FLAGS ENTERTAINMENT CORPORATION 1000 BALLPARK WAY, SUITE 400 ARLINGTON, TX76011 Interim CFO Signatures /s/ Stephen Purtell 04/01/2022 Signature of Reporting Person Date

Explanation of Responses:

( 1 )75% of the reported options are vested with the remainder to vest on 8/30/2022, if the reporting person has been continuously employed with the Issuer through such date, subject to accelerated vesting in certain events, including certain terminations or upon a change of control, or as provided for by the Compensation Committee of the Issuer's Board of Directors. ( 2 )50% of the reported options are vested with the remainder to vest in two equal installments on 8/30/2022 and 8/30/2023, if the reporting person has been continuously employed with the Issuer through such date, subject to accelerated vesting in certain events, including certain terminations or upon a change of control, or as provided for by the Compensation Committee of the Issuer's Board of Directors.

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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