Table of Contents As filed with the U.S. Securities and Exchange Commission on September 9, 2025. Registration No. 333- UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM S-1 REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 Bain Capital GSS Investment Corp. (Exact Name of Registrant as Specified in Its Charter) (State or Other Jurisdiction of Incorporation or Organization) Cayman Islands 6770 98-1853296 (Primary Standard Industrial Classification Code Number) (I.R.S. Employe ...