SCHEDULE 13G/A 0002069654 XXXXXXXX LIVE 1 Class A Common Stock, par value $0.00001 per share 11/18/2025 0001673743 Hinge Health, Inc. 433313103 455 Market Street, Suite 700 San Francisco CA 94105 Rule 13d-1(d) Atomico Advisors IV, Ltd. a E9 0 4139144 0 4139144 4139144 N 5.1 PN The number of shares beneficially owned consists of (i) 3,376,865 shares of Class A Common Stock held by Atomico IV L.P., of which 1,876,570 shares are subject to a share collar contract dated December 8, 2025, and (ii) 762,279 shares of Class A Common Stock held by Atomico IV (Guernsey), L.P., of which 423,430 shares are subject to a share collar contract dated December 8, 2025. Atomico Advisors IV, Ltd. is the general partner of Atomico IV L.P. and Atomico IV (Guernsey), L.P. Percentage ownership is based on 81,301,251 total shares of Class A Common Stock, Class B Common Stock, and Series E Preferred Stock outstanding as of October 30, 2025, as reported in the Issuer's Quarterly Report on Form 10-Q filed with the Securities and Exchange Commission (the "SEC") on November 7, 2025. Atomico IV, L.P. a E9 0 4139144 0 4139144 4139144 N 5.1 PN See comments on the cover page by Atomic Advisors IV, Ltd. Atomico IV (Guernsey), L.P. a Y7 0 4139144 0 4139144 4139144 N 5.1 PN See comments on the cover page by Atomic Advisors IV, Ltd. Hinge Health, Inc. 455 Market Street, Suite 700, San Francisco, California 94105 This Statement on Schedule 13G has been filed on behalf of the following persons (each, a "Reporting Person" and collectively, the "Reporting Persons"): 1. Atomico Advisors IV, Ltd. 2. Atomico IV, L.P. 3. Atomico IV (Guernsey), L.P. The address for each of Atomico Advisors IV, Ltd. and Atomico IV, L.P. is One Capital Place, Grand Cayman, Cayman Islands KY1-1103. The address for Atomico IV (Guernsey), L.P. is P.O. Box 286, Floor 2 Trafalgar Court, Les Banques, St. Peter Port, Guernsey GY1 4LY. See Row 4 of cover page for each Reporting Person. Y See Row 9 of cover page for each Reporting Person. See Row 11 of cover page for each Reporting Person. See Row 5 of cover page for each Reporting Person. See Row 6 of cover page for each Reporting Person. See Row 7 of cover page for each Reporting Person. See Row 8 of cover page for each Reporting Person. Y Y Y Y Y Y Exhibit 99.1 - Joint Filing Agreement (incorporated by reference to Exhibit 99.1 to the Schedule 13G filed by the Reporting Person with the SEC on July 30, 2025). Atomico Advisors IV, Ltd. /s/ Nicole Ramroop 03/09/2026 Atomico IV, L.P. /s/ Nicole Ramroop 03/09/2026 Atomico IV (Guernsey), L.P. /s/ Nicole Ramroop 03/09/2026