Ownership Submission
FORM 3
 UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF 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 *
  Grondahl Marc
 2. Date of Event Requiring Statement (Month/Day/Year)
08/06/2015		 3. Issuer Name and Ticker or Trading Symbol
Planet Fitness, Inc. [PLNT]
(Last)
(First)
(Middle)
C/O PLANET FITNESS, INC., 26 FOX RUN ROAD		 4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
__X__ Director _____ 10% Owner
_____ Officer (give title below) _____ Other (specify below)
5. If Amendment, Date Original Filed(Month/Day/Year)
(Street)

NEWINGTON, NH 03801		 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 Beneficially Owned
1.Title of Security
(Instr. 4)		 2. Amount of Securities Beneficially Owned
(Instr. 4)		 3. Ownership Form: Direct (D) or Indirect (I)
(Instr. 5)		 4. Nature of Indirect Beneficial Ownership
(Instr. 5)

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly. SEC 1473 (7-02)
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Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security
(Instr. 4)		 2. Date Exercisable and Expiration Date
(Month/Day/Year)		 3. Title and Amount of Securities Underlying Derivative Security
(Instr. 4)		 4. Conversion or Exercise Price of Derivative Security 5. Ownership Form of Derivative Security: Direct (D) or Indirect (I)
(Instr. 5)		 6. Nature of Indirect Beneficial Ownership
(Instr. 5)
Date Exercisable Expiration Date Title Amount or Number of Shares
Holding Units and Class B common stock   (1)(2)   (2) Class A common stock 5,367,695 $ (2) I By Trust (3)

Reporting Owners

Reporting Owner Name / Address Relationships
Director 10% Owner Officer Other
Grondahl Marc
C/O PLANET FITNESS, INC.
26 FOX RUN ROAD
NEWINGTON, NH 03801		   X      

Signatures

/s/ Justin Vartanian, attorney-in-fact 08/06/2015
**Signature of Reporting Person Date

Explanation of Responses:

* If the form is filed by more than one reporting person, see Instruction 5(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) The Common Units of Pla-Fit Holdings, LLC ("Holding Units") and shares of Class B common stock of Planet Fitness, Inc. (the "Company") reported herein were issued pursuant to a reclassification of Pla-Fit Holdings, LLC on August 5, 2015.
(2) Pursuant to the terms of the Exchange Agreement dated as of August 5, 2015 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 holderes 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. The Holding Units do not expire and the holders thereof are not required to pay an exercise price in connection with exchanges. 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.
(3) Represents 5,367,695 Holding Units and 5,367,695 shares of Class B common stock held by The Marc Grondahl Revocable Trust of 2006, u/d/t 06/01/06. Mr. Grondahl disclaims beneficial ownership of such securities except to the extent of his pecuniary interest therein.
 
Remarks:
Justin Vartanian is signing on behalf of Marc Grondahl pursuant to a Power of Attorney dated July 29, 2015, which is attached hereto as an exhibit.

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