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 *

BALK LANCE C
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)
Exec. VP and General Counsel
(Last)          (First)          (Middle)

C/O SIX FLAGS, 924 AVENUE J EAST
3. Date of Earliest Transaction (MM/DD/YYYY)

8/1/2017
(Street)

GRAND PRAIRIE, TX 75050
(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 $0.025 per share   8/1/2017     S    48598   (1) D $57.098   (2) 18435   (3) D    
Common Stock, par value $0.025 per share   8/1/2017     S    400   (1) D $57.688   (4) 18035   D    
Common Stock, par value $0.025 per share   6/13/2017     G   V 31012   D $0   168988   I   By GRAT  
Common Stock, par value $0.25 per share                  31012   I   By Reporting Person's Wife as Trustee of family trust  

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

Explanation of Responses:
(1)  The transactions reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan previously adopted by Lance C. Balk.
(2)  The price reported in column 4 is a weighted average price. These shares were sold in multiple transactions ranging from $56.68 to $57.64, inclusive. The reporting person undertakes to provide Issuer, any security holder of Issuer or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote.
(3)  Includes 416 shares of common stock acquired pursuant to the Issuer's Employee Stock Purchase Plan since the last-filed Form 4.
(4)  The price reported in column 4 is a weighted average price. These shares were sold in multiple transactions ranging from $57.68 to $57.71, inclusive. The reporting person undertakes to provide Issuer, any security holder of Issuer or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote.

Reporting Owners
Reporting Owner Name / Address
Relationships
Director 10% Owner Officer Other
BALK LANCE C
C/O SIX FLAGS
924 AVENUE J EAST
GRAND PRAIRIE, TX 75050


Exec. VP and General Counsel

Signatures
/s/ Lance C. Balk 8/3/2017
** 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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