X0202 SCHEDULE 13G/A 0001214659-26-001997 0001317195 XXXXXXXX LIVE 1 Class A ordinary shares, par value $0.0001 per share 03/31/2026 0002064355 Bain Capital GSS Investment Corp. G0R78B106 200 Clarendon Street Boston MA 02116 Rule 13d-1(b) Empyrean Capital Partners, LP DE 0.00 4340641.00 0.00 4340641.00 4340641.00 N 9.26 IA PN Amos Meron X1 0.00 4340641.00 0.00 4340641.00 4340641.00 N 9.26 HC IN Bain Capital GSS Investment Corp. 200 Clarendon Street, Boston, MA, 02116 This statement is filed by: (i) Empyrean Capital Partners, LP ("ECP"), a Delaware limited partnership, which serves as investment manager to Empyrean Capital Overseas Master Fund, Ltd. ("ECOMF"), a Cayman Islands exempted company, with respect to the Class A ordinary shares, par value $0.0001 per share (the "Class A Ordinary Shares") of Bain Capital GSS Investment Corp. (the "Company") directly held by ECOMF; (ii) Mr. Amos Meron, who serves as the managing member of Empyrean Capital, LLC, the general partner of ECP, with respect to the Class A Ordinary Shares directly held by ECOMF. The foregoing persons are hereinafter sometimes collectively referred to as the "Reporting Persons." Any disclosures herein with respect to persons other than the Reporting Persons are made on information and belief after making inquiry to the appropriate party. The foregoing should not be construed in and of itself as an admission by any Reporting Person as to beneficial ownership of Class A Ordinary Shares owned by another Reporting Person. The address of the business office of each of the Reporting Persons is c/o Empyrean Capital Partners, L.P., 10250 Constellation Boulevard, Suite 2950, Los Angeles, CA 90067 ECP - a Delaware limited partnership Amos Meron - United States N IA HC 4,340,641 9.26 0 4,340,641 0 4,340,641 The ownership percentages reported in this Schedule 13G are based on 46,900,000 Class A Ordinary Shares outstanding as of March 16, 2026, as disclosed in the Company's Annual Report on Form 10-K for the quarter ended December 31, 2025, filed with the Securities and Exchange Commission on March 20, 2026. Y N See Item 2(a). Y Y Y N By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were acquired and are held in the ordinary course of business and 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. Exhibit 99.1 Joint Filing Agreement Empyrean Capital Partners, LP /s/ Jennifer Norman 05/15/2026 Amos Meron /s/ Amos Meron 05/15/2026