Ownership Submission
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

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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(Print or Type Responses)
1. Name and Address of Reporting Person *
LIVELY DORVIN D
   2. Issuer Name and Ticker or Trading Symbol
Planet Fitness, Inc. [PLNT] 		5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
_____ Director _____ 10% Owner
_____ Officer (give title below) _____ Other (specify below)
President & CFO
(Last)
(First)
(Middle)
C/O PLANET FITNESS, INC., 4 LIBERTY LANE WEST		 3. Date of Earliest Transaction (Month/Day/Year)
12/12/2017
(Street)

HAMPTON, NH 03842		 4. If Amendment, Date Original Filed(Month/Day/Year)
 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 (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 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
Class A Common Stock 12/12/2017   C(1)   67,273 (1) A $ 0 67,273 D  
Class A Common Stock 12/12/2017   S(1)   67,273 (1) D $ 31.2843 (2) 0 D  
Class A Common Stock 12/13/2017   C(3)   38,170 (3) A $ 0 38,170 D  
Class A Common Stock 12/13/2017   S(3)   38,170 (3) D $ 31.8763 (4) 0 D  

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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 (Month/Day/Year) 3A. Deemed Execution Date, if any (Month/Day/Year) 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
(Month/Day/Year)		 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
Holding Units and Class B common stock (1) (5) 12/12/2017   C     67,273 (1)   (5)   (5) Class A common stock 67,273 (1) $ 0 993,183 (5) D  
Holding Units and Class B common stock (3) (5) 12/13/2017   C     38,170 (3)   (5)   (5) Class A common stock 38,170 (3) $ 0 955,013 (5) D  

Reporting Owners

Reporting Owner Name / Address Relationships
 Director  10% Owner  Officer  Other
LIVELY DORVIN D
C/O PLANET FITNESS, INC.
4 LIBERTY LANE WEST
HAMPTON, NH 03842		       President & CFO  

Signatures

 /s/ Justin Vartanian, Attorney-in-Fact   12/14/2017
**Signature of Reporting Person Date

Explanation of Responses:

* 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).
(1) On December 12, 2017, Dorvin Lively exchanged 67,273 Common Units of Pla-Fit Holdings, LLC ("Holding Units") and 67,273 shares of Class B common stock of Planet Fitness, Inc. (the "Company") for 67,273 shares of Class A common stock of the Company, and substantially simultaneously sold all 67,273 shares of Class A common stock of the Company on the open market. Following the sale, Mr. Lively held 993,183 Holding Units and 993,183 shares of Class B common stock of the Company.
(2) The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $31.10 to $31.55, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the 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 herein.
(3) On December 13, 2017, Dorvin Lively exchanged 38,170 Common Units of Pla-Fit Holdings, LLC ("Holding Units") and 38,170 shares of Class B common stock of Planet Fitness, Inc. (the "Company") for 38,170 shares of Class A common stock of the Company, and substantially simultaneously sold all 38,170 shares of Class A common stock of the Company on the open market. Following the sale, Mr. Lively holds 955,013 Holding Units and 955,013 shares of Class B common stock of the Company.
(4) The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $31.64 to $32.10, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the 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 herein.
(5) Pursuant to the terms of the Exchange Agreement dated as of August 5, 2015, as amended, by and among the Company, Pla-Fit Holdings, LLC and the holders from time to time of Holding Units and shares of Class B common stock, the holders thereof may exchange all or a portion of their Holding Units along with an equal number of shares of Class B common stock for shares of Class A common stock of the Company on a one-to-one basis (one Holding Unit and one share of Class B common stock together exchangeable for one share of Class A common stock). The holders thereof are not required to pay an exercise price in connection with any such exchange. The Holding Units do not expire. The Class B common stock provides the holder with one vote on all matters submitted to a vote of the Company's stockholders but does not entitle the holder to any of the economic rights associated with shares of the Company's Class A common stock.
 
Remarks:
Mr. Lively is President and Chief Financial Officer of the Company.

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