Antony Prabhu

SEC source: 0001213900-26-084779 · ownership.xml · nonDerivative · entry 1

Antony Prabhu · CIK 0001853814 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 14,584

F1 · shares: Represents shares of common stock issued to the reporting person as quarterly compensation for the quarter ended June 30, 2026, for services as a non-executive director under the issuer's director compensation policy pursuant to its 2022 Equity Incentive Plan, as amended. The number of shares awarded was determined based on the 10-day volume weighted average closing price of the issuer's common stock, as reported on The Nasdaq Stock Market LLC, for the period ending on and including July 30, 2026, which was $1.4341.

SEC source: 0001213900-26-051816 · ownership.xml · nonDerivative · entry 1

Antony Prabhu · CIK 0001853814 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,510

F1 · shares: The Issuer effected a 1-for-25 reverse stock split of its issued and outstanding common stock on April 30, 2026 (the "Reverse Stock Split"). All share amounts reported on this Form 4 have been adjusted to reflect the Reverse Stock Split.

F2 · shares: Represents shares of common stock issued to the reporting person as quarterly compensation for services as a non-executive director under the Issuer's director compensation policy pursuant to its 2022 Equity Incentive Plan, as amended. The value of these shares of common stock is pro-rated to reflect the reporting person's service for the portion of the fiscal quarter following his appointment on February 24, 2026. The number of shares awarded was determined based on the 10-day volume weighted average closing price of the Issuer's common stock, as reported on The Nasdaq Stock Market LLC, for the period ending on and including April 30, 2026, which, as adjusted for the Reverse Stock Split, was $4.6911.

F1 · balance_after: The Issuer effected a 1-for-25 reverse stock split of its issued and outstanding common stock on April 30, 2026 (the "Reverse Stock Split"). All share amounts reported on this Form 4 have been adjusted to reflect the Reverse Stock Split.

SEC source: 0001829126-26-001084 · ownership.xml · derivative · entry 1

Antony Prabhu · CIK 0001853814 · Director · Chief Financial Officer · 10% owner

10b5-1 filing: No plan indicated

Ownership: Indirect · See footnote

Disclosed balance after: 991,667

Underlying: Class A Ordinary Shares · 100,000 shares

Expires not disclosed

F2 · security: The shares were, and are, as applicable, directly held by the Sponsor. The reporting person is a member of BP SPAC Sponsor II LLC, the sole managing member of the Sponsor. As such, the reporting person has voting and investment discretion with respect to the ordinary shares held of record by the Sponsor and may be deemed to have shared beneficial ownership of the ordinary shares held directly by the Sponsor. The reporting person disclaims any beneficial ownership of the reported shares other than to the extent of any pecuniary interest he may have therein, directly or indirectly.

F1 · derivative.exercise_price: On, and effective, February 5, 2026, the board of directors (the "Board") of StoneBridge Acquisition II Corporation (the "Issuer") approved an equity grant of 100,000 Class B Ordinary Shares of the Issuer to four independent members of the Board for their respective services as members of the Board and committees of the Board. The Class B Shares were transferred by and from the Issuer's sponsor, StoneBridge Acquisition Sponsor II LLC (the "Sponsor"), to the four independent members of the Board. The Class B Ordinary Shares 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 certain adjustments and have no expiration date.

F1 · price: On, and effective, February 5, 2026, the board of directors (the "Board") of StoneBridge Acquisition II Corporation (the "Issuer") approved an equity grant of 100,000 Class B Ordinary Shares of the Issuer to four independent members of the Board for their respective services as members of the Board and committees of the Board. The Class B Shares were transferred by and from the Issuer's sponsor, StoneBridge Acquisition Sponsor II LLC (the "Sponsor"), to the four independent members of the Board. The Class B Ordinary Shares 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 certain adjustments and have no expiration date.

F1 · derivative.exercise_date: On, and effective, February 5, 2026, the board of directors (the "Board") of StoneBridge Acquisition II Corporation (the "Issuer") approved an equity grant of 100,000 Class B Ordinary Shares of the Issuer to four independent members of the Board for their respective services as members of the Board and committees of the Board. The Class B Shares were transferred by and from the Issuer's sponsor, StoneBridge Acquisition Sponsor II LLC (the "Sponsor"), to the four independent members of the Board. The Class B Ordinary Shares 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 certain adjustments and have no expiration date.

F1 · derivative.expiration_date: On, and effective, February 5, 2026, the board of directors (the "Board") of StoneBridge Acquisition II Corporation (the "Issuer") approved an equity grant of 100,000 Class B Ordinary Shares of the Issuer to four independent members of the Board for their respective services as members of the Board and committees of the Board. The Class B Shares were transferred by and from the Issuer's sponsor, StoneBridge Acquisition Sponsor II LLC (the "Sponsor"), to the four independent members of the Board. The Class B Ordinary Shares 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 certain adjustments and have no expiration date.

F2 · balance_after: The shares were, and are, as applicable, directly held by the Sponsor. The reporting person is a member of BP SPAC Sponsor II LLC, the sole managing member of the Sponsor. As such, the reporting person has voting and investment discretion with respect to the ordinary shares held of record by the Sponsor and may be deemed to have shared beneficial ownership of the ordinary shares held directly by the Sponsor. The reporting person disclaims any beneficial ownership of the reported shares other than to the extent of any pecuniary interest he may have therein, directly or indirectly.

F2 · ownership.nature: The shares were, and are, as applicable, directly held by the Sponsor. The reporting person is a member of BP SPAC Sponsor II LLC, the sole managing member of the Sponsor. As such, the reporting person has voting and investment discretion with respect to the ordinary shares held of record by the Sponsor and may be deemed to have shared beneficial ownership of the ordinary shares held directly by the Sponsor. The reporting person disclaims any beneficial ownership of the reported shares other than to the extent of any pecuniary interest he may have therein, directly or indirectly.

SEC source: 0001104659-24-033630 · tm248642-1_4seq1.xml · nonDerivative · entry 1

Antony Prabhu · CIK 0001853814 · Director · President and CFO · 10% owner

10b5-1 filing: No plan indicated

Ownership: Indirect · By Scieniti Inc.

Disclosed balance after: 230

F1 · balance_after: On March 12, 2024, the Reporting Person indirectly purchased through his family office, Scieniti Inc., on the open market a total of 230 shares of Class A ordinary shares of StoneBridge Acquisition Corporation (the "Company"). The total purchase price paid for the shares was $1725.00. In addition, the Reporting Person indirectly owns 5,000,000 shares of Class B ordinary shares of the Company through StoneBridge Acquisition Sponsor LLC.

SEC source: 0001104659-22-030413 · tm228340-2_4.xml · nonDerivative · entry 1

Antony Prabhu · CIK 0001853814 · Director · President · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · By StoneBridge Acquisition Sponsor LLC

Disclosed balance after: 5,000,000

F1 · kind: As described in StoneBridge Acquisition Corp.'s (the "Issuer") registration statement on Form S-1 (File No. 333-253641), as amended (the "Registration Statement") and the Reporting Person's Initial Statement of Beneficial Ownership of Securities on Form 3, 750,000 Class B ordinary shares, par value $0.0001 per share (the "Class B ordinary shares"), were subject to forfeiture to the extent that the underwriters did not fully or partially exercise their over-allotment option in the Issuer's initial public offering of its securities. The underwriters did not exercise their over-allotment option, resulting in the Reporting Person forfeiting 750,000 Class B ordinary shares.

F2 · balance_after: StoneBridge Acquisition Sponsor LLC, a Delaware limited liability company (the "Sponsor"), is the record holder of such Class B ordinary shares. The Class B ordinary shares 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, as described in the Registration Statement. Mr. Antony is one of the managing members of the Sponsor. As such, Mr. Antony may be deemed to share beneficial ownership of such Class B ordinary shares held directly by the Sponsor. The filing of this statement shall not be deemed to be an admission that, for purposes of Section 16 of the Securities Exchange Act of 1934, as amended, or otherwise, the Reporting Person is the beneficial owner of any securities reported herein.

F2 · ownership.nature: StoneBridge Acquisition Sponsor LLC, a Delaware limited liability company (the "Sponsor"), is the record holder of such Class B ordinary shares. The Class B ordinary shares 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, as described in the Registration Statement. Mr. Antony is one of the managing members of the Sponsor. As such, Mr. Antony may be deemed to share beneficial ownership of such Class B ordinary shares held directly by the Sponsor. The filing of this statement shall not be deemed to be an admission that, for purposes of Section 16 of the Securities Exchange Act of 1934, as amended, or otherwise, the Reporting Person is the beneficial owner of any securities reported herein.