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( Mark One ) 0 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington , D.C. 20549 ANNUAL REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31 , 2020 TRANSITION REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE TRANSITION PERIOD FROM ΤΟ Commission File Number 001-37534 FORM 10 - K Delaware ( State or Other Jurisdiction of Incorporation or Organization ) PLANET FITNESS , INC . ( Exact name of Registrant as specified in its Charter ) Securities registered pursuant to Section 12 ( b ) of the Act : Title of each class Class A common stock , $ 0.0001 Par Value Large accelerated filer Non - accelerated filer □ 4 Liberty Lane West , Hampton , NH 03842 ( Address of Principal Executive Offices and Zip Code ) ( 603 ) 750-0001 ( Registrant's Telephone Number , Including Area Code ) Trading Symbol ( s ) PLNT 38-3942097 ( I.R.S. Employer Identification No. ) Securities registered pursuant to Section 12 ( g ) of the Act : None Indicate by check mark if the Registrant is a well - known seasoned issuer , as defined in Rule 405 of the Securities Act . Yes > No Indicate by check mark if the Registrant is not required to file reports pursuant to Section 13 or 15 ( d ) of the Act . Yes No Indicate by check mark whether the Registrant : ( 1 ) has filed all reports required to be filed by Section 13 or 15 ( d ) of the Securities Exchange Act of 1934 during the preceding 12 months ( or for such shorter period that the Registrant was required to file such reports ) , and ( 2 ) has been subject to such filing requirements for the past 90 days . Yes > No Indicate by check mark whether the Registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S - T ( §232.405 of this chapter ) during the preceding 12 months ( or for such shorter period that the Registrant was required to submit such files ) . Yes NO Name of each exchange on which registered New York Stock Exchange Indicate by check mark whether the Registrant is a large accelerated filer , an accelerated filer , a non - accelerated filer a smaller reporting company or an emerging growth company . See the definitions of the " large accelerated filer , " " accelerated filer , " " non - accelerated filer , " " smaller reporting company " and " emerging growth company " in Rule 12b - 2 of the Exchange Act : Accelerated filer Small reporting company Emerging Growth Company 000 If an emerging growth company , indicate by check mark if the Registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13 ( a ) of the Exchange Act . Indicate by check mark whether the registrant has filed a report on and attestation to its management's assessment of the effectiveness of its internal control over financial reporting under Section 404 ( b ) of the Sarbanes - Oxley Act ( 15 U.S.C. 7262 ( b ) ) by the registered public accounting firm that prepared or issued its audit report . Yes No Indicate by check mark whether the Registrant is a shell company ( as defined in Rule 12b - 2 of the Exchange Act ) . Yes No The aggregate market value of the Registrant's Class A common stock held by non - affiliates , computed by reference to the last reported sale price of the Class A common stock as reported on the New York Stock Exchange on June 30 , 2020 was approximately $ 4.8 billion . The number of outstanding shares of the registrant's Class A common stock , par value $ 0.0001 per share , and Class B common stock , par value $ 0.0001 per share , as of February 22 , 2021 was 83,079,078 shares and 3,473,075 shares , respectively . DOCUMENTS INCORPORATED BY REFERENCE Portions of the Definitive Proxy Statement for the registrant's 2021 Annual Meeting of Stockholders to be held May 3 , 2021 , are incorporated by reference into Part III , Items 10-14 of this Annual Report on Form 10 - K .