SEC FORM 3

SEC FORM 3 SEC 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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1. Name and Address of Reporting Person^*

Antony Prabhu

(Last)

(First)

(Middle)

ONE WORLD TRADE CENTER, SUITE 8500

(Street)

NEW YORK

10007

(City)

(State)

(Zip)

2. Date of Event Requiring Statement (Month/Day/Year)
09/29/2025

3. Issuer Name and Ticker or Trading Symbol
StoneBridge Acquisition II Corp [ APAC ]

4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director	10% Owner
X	Officer (give title below)	Other (specify below)
	Chief Financial Officer

5. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

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)

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: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
1. Title of Derivative Security (Instr. 4)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	4. Conversion or Exercise Price of Derivative Security	5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
Class B Ordinary Shares	⁽¹⁾	⁽¹⁾	Class A Ordinary Shares	1,091,667⁽²⁾⁽³⁾	⁽¹⁾	I	See footnote⁽²⁾⁽³⁾

Explanation of Responses:

1. As described in the issuer's registration statement on Form S-1 (No. 333-286983) under the heading "Description of Securities - Ordinary Shares - Founder Shares", the Class B Ordinary Shares will automatically convert into shares of Class A Ordinary Shares at the time of the issuer's initial business combination on a one-forone basis subject to certain adjustments and have no expiration date.

2. These shares represent the Class B Ordinary Shares held by StoneBridge Acquisition Sponsor II LLC (the "Sponsor"), acquired pursuant to a subscription agreement by and between the Sponsor and the issuer. The Class B ordinary shares owned by the Sponsor includes up to 250,000 shares that are subject to forfeiture in the event the underwriters of the initial public offering of the issuer's securities do not exercise their over-allotment option in full as described in the issuer's registration statement.

3. The reporting person is a member of BP SPAC Sponsor II LLC, an entity organized under the laws of Texas, a 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 and disclaims any beneficial ownership of the reported shares other than to the extent of any pecuniary interest he may have therein, directly or indirectly.

	/s/ Prabhu Antony	09/29/2025
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* 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).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.

SEC Form 3 filed by new insider Antony Prabhu