Mizuho Securities USA trims StoneBridge (APACU) stake in share sale

Rhea-AI Filing Summary

Mizuho Securities USA LLC, a 10% owner of StoneBridge Acquisition II Corp, reported an open-market sale of common stock. On November 24, 2025, the firm sold 531,255 shares at $9.95 per share. After this transaction, it reported holding 100,000 shares of common stock with direct ownership.

Insider Trade Summary

Net Seller: 531,255 shares ($5,285,987)

Net Sell 1 txn

Insider MIZUHO SECURITIES USA LLC

Role 10% Owner

Sold 531,255 shs ($5.29M)

Type	Security	Shares	Price	Value
Sale	Common Stock	531,255	$9.95	$5.29M

Holdings After Transaction: Common Stock — 100,000 shares (Direct)

Footnotes (1)

Form 4 Insider Transactions: What Each Field Means →

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

X

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

MIZUHO SECURITIES USA LLC

(Last) (First) (Middle)

1271 AVENUE OF THE AMERICAS

FLOORS - 2,3,4,18,19

(Street)

NEW YORK NY 10020

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
StoneBridge Acquisition II Corp [ APACU ]

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

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

3. Date of Earliest Transaction (Month/Day/Year)
07/08/2024

4. 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 Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock	11/24/2025	11/24/2025	S		531,255	D	$9.95	100,000	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

	Gregory Doig	11/25/2025
	** 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 4 (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.

FAQ

What insider transaction did Mizuho Securities USA LLC report for APACU?

Mizuho Securities USA LLC reported an open-market sale of APACU common stock. It sold 531,255 shares of StoneBridge Acquisition II Corp at $9.95 per share, reflecting a significant reduction in its directly held position disclosed in the Form 4 filing.

When did the reported APACU share sale by Mizuho Securities USA LLC occur?

The reported APACU share sale occurred on November 24, 2025. On that date, Mizuho Securities USA LLC executed an open-market transaction in StoneBridge Acquisition II Corp common stock, as disclosed in the Form 4 insider trading report.

How many APACU shares did Mizuho Securities USA LLC sell and at what price?

Mizuho Securities USA LLC sold 531,255 APACU common shares at $9.95 each. The transaction was categorized as a sale in the open market or a private transaction under code “S” in the Form 4 disclosure for StoneBridge Acquisition II Corp.

How many APACU shares does Mizuho Securities USA LLC hold after the sale?

After the sale, Mizuho Securities USA LLC reported beneficial ownership of 100,000 APACU common shares. The Form 4 indicates these remaining shares of StoneBridge Acquisition II Corp are held with direct ownership following the disclosed open-market sale.

What is Mizuho Securities USA LLC’s relationship to StoneBridge Acquisition II Corp (APACU)?

Mizuho Securities USA LLC is identified as a 10% owner of StoneBridge Acquisition II Corp. This status means it holds a significant portion of APACU’s equity, triggering ongoing insider reporting obligations under Section 16, including the Form 4 transaction disclosure.

What transaction code was used for the APACU sale by Mizuho Securities USA LLC?

The APACU sale used transaction code “S” on Form 4. Code S indicates a sale in the open market or a private transaction, clarifying that Mizuho Securities USA LLC disposed of StoneBridge Acquisition II Corp common shares rather than acquiring additional stock.