X0202 SCHEDULE 13G/A 0001214822 XXXXXXXX LIVE 1 Class A Common Stock, par value $0.0001 per share 03/31/2026 0001637207 Planet Fitness, Inc. 72703H101 4 LIBERTY LANE WEST HAMPTON NH 03842 Rule 13d-1(c) Steadfast Capital Management LP a DE 0 2212592 0 2212592 2212592 2.8 PN American Steadfast, L.P. a DE 0 807399 0 807399 807399 1.0 PN Steadfast International Master Fund Ltd. a E9 0 1405193 0 1405193 1405193 1.8 CO Robert S. Pitts, Jr. a X1 0 2212592 0 2212592 2212592 2.8 IN Planet Fitness, Inc. 4 Liberty Lane West, Hampton, NH 03842 The names of the persons filing this statement on Schedule 13G (collectively, the "Reporting Persons") are: - Steadfast Capital Management LP, a Delaware limited partnership (the "Investment Manager"). - American Steadfast, L.P., a Delaware limited partnership ("American Steadfast"). - Steadfast International Master Fund Ltd., a Cayman Islands exempted company (the "Offshore Fund"). - Robert S. Pitts, Jr., a United States Citizen ("Mr. Pitts"). Mr. Pitts is the controlling principal of the Investment Manager. The Investment Manager has the power to vote and dispose of the securities held by American Steadfast and the Offshore Fund. The business address of each of Mr. Pitts, the Investment Manager and American Steadfast is 450 Park Avenue, 20th Floor, New York, New York 10022. The business address of the Offshore Fund is c/o Morgan Stanley Fund Services (Cayman) Ltd., 190 Elgin Avenue, George Town, Grand Cayman KY1-9008, Cayman Islands. Each of the Investment Manager and American Steadfast is a limited partnership formed under the laws of the State of Delaware. The Offshore Fund is an exempted company formed under the laws of the Cayman Islands. Mr. Pitts is a citizen of the United States. Y As of March 31, 2026, the Reporting Persons beneficially owned an aggregate of 2,212,592 shares of the Issuer's Common Stock. Specifically: (i) The Investment Manager beneficially owned 2,212,592 shares of Common Stock. (ii) American Steadfast beneficially owned 807,399 shares of Common Stock. (iii) The Offshore Fund beneficially owned 1,405,193 shares of Common Stock. (iv) Mr. Pitts beneficially owned 2,212,592 shares of Common Stock. (v) Collectively, the Reporting Persons beneficially owned 2,212,592 shares of Common Stock. As of March 31, 2026, the Reporting Persons may be deemed to have beneficially owned 2,212,592 shares of Common Stock or 2.8% of the Issuer's Common Stock outstanding, which percentage was calculated based on 79,697,889 shares of Common Stock outstanding as of February 20, 2026, as per the information reported in the Issuer's Form 10-K filed February 25, 2026. Specifically: (i) The Investment Manager's beneficial ownership of 2,212,592 shares of Common Stock represented 2.8% of the outstanding Common Stock. (ii) American Steadfast's beneficial ownership of 807,399 shares of Common Stock represented 1% of the outstanding Common Stock. (iii) The Offshore Fund's beneficial ownership of 1,405,193 shares of Common Stock represented 1.8% of the outstanding Common Stock. (iv) Mr. Pitts' beneficial ownership of 2,212,592 shares of Common Stock represented 2.8% of the outstanding Common Stock. (v) Collectively, the Reporting Persons' beneficial ownership of 2,212,592 shares of Common Stock represented 2.8% of the outstanding Common Stock. Not applicable. American Steadfast had shared power with the Investment Manager and Mr. Pitts to vote or direct the vote of the 807,399 shares of Common Stock beneficially owned by American Steadfast. The Offshore Fund had shared power with the Investment Manager and Mr. Pitts to vote or direct the vote of the 1,405,193 shares of Common Stock beneficially owned by the Offshore Fund. Not applicable. American Steadfast had shared power with the Investment Manager and Mr. Pitts to dispose or direct the disposition of the 807,399 shares of Common Stock beneficially owned by American Steadfast. The Offshore Fund had shared power with the Investment Manager and Mr. Pitts to dispose or direct the disposition of the 1,405,193 shares of Common Stock beneficially owned by the Offshore Fund. N Y Y Y N See Exhibit B to the Schedule 13G filed by the Reporting Persons with the Securities and Exchange Commission on January 15, 2026. Y N By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under ?? 240.14a-11. Steadfast Capital Management LP /s/ Sheena Koshy 05/15/2026 American Steadfast, L.P. /s/ Sheena Koshy 05/15/2026 Steadfast International Master Fund Ltd. /s/ Sheena Koshy 05/15/2026 Robert S. Pitts, Jr. Robert S. Pitts, Jr. 05/15/2026