Initial Statement of Beneficial Ownership (Form 3)

FORM 3

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940

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(Print or Type Responses)

1. Name and Address of Reporting Person * Bain Capital GSS Investment Sponsor LLC 2. Date of Event Requiring Statement (Month/Day/Year) 09/29/2025 3. Issuer Name and Ticker or Trading Symbol Bain Capital GSS Investment Corp. [BCSS] (Last) (First) (Middle) 200 CLARENDON STREET 4. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director __X__ 10% Owner _____ Officer (give title below) _____ Other (specify below) 5. If Amendment, Date Original Filed (Month/Day/Year) (Street) BOSTON, MA 02116 6. Individual or Joint/Group Filing (Check Applicable Line) _X_ Form filed by One Reporting Person ___ Form filed by More than One Reporting Person (City) (State) (Zip) Table I - Non-Derivative Securities Beneficially Owned

1.Title of Security (Instr. 4) 2. Amount of Securities Beneficially Owned (Instr. 4) 3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5) 4. Nature of Indirect Beneficial Ownership (Instr. 5) Class A ordinary shares, par value $0.0001 per share(3) 900,000 D

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.			SEC 1473 (7-02)
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Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)

1. Title of Derivative Security (Instr. 4)	2. Date Exercisable and Expiration Date (Month/Day/Year)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Class B ordinary shares, par value $0.0001	(4)	(4)	Class A ordinary shares, par value $0.0001 per share	12,370,000(5)	(4)	D(1)(2)

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
Bain Capital GSS Investment Sponsor LLC 200 CLARENDON STREET BOSTON, MA 02116		X

Signatures

/s/ Angelo Rufino, Authorized Signatory of Bain Capital GSS Investment Sponsor LLC		10/01/2025
**Signature of Reporting Person		Date

Explanation of Responses:

*	If the form is filed by more than one reporting person, see Instruction 5(b)(v).
**	Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
(1)	This Form 3 is being filed by Bain Capital GGS Investment Sponsor LLC (the "Sponsor") and . The Sponsor is controlled by its controlling members. As a result, each of the Sponsor and its controlling members may be deemed to have beneficial ownership of the Class B ordinary shares and the Private Placement Units (as defined below) (including the Private Placement Shares (as defined below) included in such units) held by our Sponsor.
(2)	The reporting person under this Form 3 disclaims beneficial ownership of the Class B ordinary shares reported herein except to the extent of their respective pecuniary interest therein and the filing of this Form 3 shall not be construed as an admission that any such reporting person is the beneficial owner of any Class B ordinary share covered by this Form 3.
(3)	Represents Class A ordinary shares, par value $0.0001, of the issuer (the "Private Placement Shares") that are included in the 900,000 private placement units (the "Private Placement Units") that will be purchased by the Sponsor from the issuer in a private placement at $10.00 per Private Placement Unit (the "Private Placement"), as described in the issuer's registration statement on Form S-1 (File No. 333-290126) (the "Registration Statement"). Each Private Placement Unit is comprised of one Private Placement Share and one-fifth of one warrant (the "Private Placement Warrants"), each whole Private Placement Warrant exercisable to purchase one Private Placement Share. Does not represent any Private Placement Shares issuable upon the exercise of Private Placement Warrants.
(4)	Pursuant to the Issuer's amended and restated memorandum and articles of association, the Class B ordinary shares have no expiration date and will automatically convert into Class A ordinary shares at the time of the Issuer's initial business combination on a one-for-one basis subject to adjustment pursuant to certain anti-dilution rights.
(5)	The Class B ordinary shares reported herein include up to 1,500,000 Class B ordinary shares that are subject to forfeiture to the extent the underwriters of the initial public offering of the issuer's securities do not exercise in full their over-allotment option, as described in the Registration Statement. The over-allotment option of the underwriters expires 45-day from the date of the final prospectus related to the issuer's initial public offering.

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