SCHEDULE 13G 0002069654 XXXXXXXX LIVE Class A Common Stock, par value $0.00001 per share 05/23/2025 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 6713063 0 6713063 6713063 N 8.3 PN The number of shares beneficially owned consists of (i) 5,476,823 shares of Class B Common Stock held by Atomico IV L.P. and (ii) 1,236,240 shares of Class B Common Stock held by Atomico IV (Guernsey), L.P. Atomico Advisors IV, Ltd. is the general partner of Atomico IV L.P. and Atomico IV (Guernsey), L.P. Percentage ownership is based on 80,597,784 total shares of Class A Common Stock, Class B Common Stock, and Series E Preferred Stock outstanding immediately following the Issuer's initial public offering on May 23, 2025, as reported in the Issuer's final prospectus filed with the Securities and Exchange Commission on May 23, 2025 pursuant to Rule 424(b)(4) of the Securities Act of 1933 (the "424B4 Prospectus"). The Class B Common Stock will be convertible into shares of Class A Common Stock on a one-to-one basis at any time at the option of the holder upon written notice to the Issuer. In addition, the Class B Common Stock will automatically convert into shares of Class A Common Stock immediately prior to the close of business on the earliest to occur of certain events specified in the Issuer's Amended and Restated Certificate of Incorporation. Each share of Class A Common Stock is entitled to one vote and each share of Class B Common Stock is entitled to fifteen votes. There were 53,266,406 shares of Class B Common Stock outstanding as of May 23, 2025, as reported in the 424B4 Prospectus. The percentage reported does not reflect the fifteen for one voting power of the Class B Common Stock because these shares are treated as converted into Class A Common Stock for the purpose of this report. Atomico IV, L.P. a E9 0 6713063 0 6713063 6713063 N 8.3 PN See comments on the cover page by Atomic Advisors IV, Ltd. Atomico IV (Guernsey), L.P. a Y7 0 6713063 0 6713063 6713063 N 8.3 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 Atomico Advisors IV, Ltd. By: /s/ Nicole Ramroop 07/30/2025 Atomico IV, L.P. By: /s/ Nicole Ramroop 07/30/2025 Atomico IV (Guernsey), L.P. By: /s/ Nicole Ramroop 07/30/2025