Bain Capital GSS Investment Sponsor LLC - 18 Dec 2025 Form 4 Insider Report for Bain Capital GSS Investment Corp. (BCSS)

Reporting relationship: 10%+ Owner
Issuer ticker: BCSS
Reported as of: 18 Dec 2025
Net transaction value: $0
SEC form: 4
Accepted by SEC: 22 Dec 2025, 17:07:57 UTC
Prior SEC filing: 01 Oct 2025
Source filing: View source filing
Reporting owner signature: /s/ Angelo Rufino, Authorized Signatory of Bain Capital GSS Investment Sponsor LLC

Key filing fact

Bain Capital GSS Investment Sponsor LLC filed Form 4 for Bain Capital GSS Investment Corp. (BCSS) on 22 Dec 2025.

Key facts

This page summarizes Bain Capital GSS Investment Sponsor LLC's Form 4 filing for Bain Capital GSS Investment Corp. (BCSS).
1 reported transaction and 1 derivative row are listed below.
Accepted by SEC: 22 Dec 2025, 17:07.

Change

Previous filing in this sequence was filed on 01 Oct 2025.
Current net transaction value: $0.

Research use

This tells you what this filing adds before you inspect full transaction and derivative tables.
You can trace every row back to the original SEC filing document.

Evidence

Filed on Form 4

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (1)

CIK 0002083643 Primary reporting owner

Bain Capital GSS Investment Sponsor LLC

Relationship: 10%+ Owner
Address: 200 CLARENDON STREET, BOSTON
Signature: /s/ Angelo Rufino, Authorized Signatory of Bain Capital GSS Investment Sponsor LLC
Signature date: 22 Dec 2025

Reported derivative securities

Options, warrants, convertible securities, or similar derivative positions disclosed in the filing.

BCSS transaction Derivative

Class B ordinary shares, par value $0.0001

Sale

Transaction value
Shares: -30,000
Change %: -0.26%
Price
Shares after: 11,440,000
Date: 18 Dec 2025
Ownership: Direct
Underlying class: Class A ordinary shares, par value $0.0001 per share
Underlying amount: 30,000
Exercise price
Footnotes: F1, F2, F3

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 3 footnotes

Footnote F1

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.

Footnote F2

This Form 4 is being filed by Bain Capital GGS Investment Sponsor LLC (the "Sponsor"). 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 held by the Sponsor.

Footnote F3

The reporting person under this Form 4 disclaims beneficial ownership of the Class B ordinary shares reported herein except to the extent of its pecuniary interest therein and the filing of this Form 4 shall not be construed as an admission that the reporting person is the beneficial owner of any Class B ordinary shares covered by this Form 4.