UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): November 18, 2025

STONEBRIDGE ACQUISITION II CORPORATION

(Exact name of registrant as specified in its charter)

Cayman Islands	001-42871	00-0000000 N/A
(State or other jurisdiction	(Commission	(IRS Employer
of incorporation)	File Number)	Identification No.)

One World Trade Center

Suite 8500

New York, New York 10007
(Address of principal executive offices)

(646) 314-3555

(Registrant’s telephone number, including area code)

N/A

(Former name or former address, if changed since last report.)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

☐

Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

☐

Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

☐

Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

☐

Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act.

Title of each class	Trading Symbol	Name of each exchange on which registered
Units, each consisting of one Class A Ordinary Share, par value $0.0001 per share, and one Right to acquire one-tenth of one Class A Ordinary Share	APACU	The Nasdaq Stock Market LLC
Class A Ordinary Shares, par value $0.0001 per share	APAC	The Nasdaq Stock Market LLC
Rights, each Right to acquire one-tenth of one Class A Ordinary Share	APACR	The Nasdaq Stock Market LLC

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

Emerging growth company ☒

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

Item 8.01 Other Events.

On November 18, 2025, StoneBridge Acquisition II Corporation (the “Company”) announced that, on or about November 21, 2025, the holders of the Company’s units (the “Units”) may elect to separately trade the Class A ordinary shares, par value $0.0001 per share (“Class A Ordinary Shares”), and the rights (the “Rights”) included in the Units. Each Unit consists of one Class A Ordinary Share and one Right to receive one-tenth of one Class A Ordinary Share upon the consummation of an initial business combination by the Company. Any Units not separated will continue to trade on the Nasdaq Capital Market (“Nasdaq”) under the symbol “APACU.” The Class A Ordinary Shares and the Rights that are separated will trade on Nasdaq under the symbols “APAC” and “APACR,” respectively. No fractional Rights will be issued upon separation of the Units and only whole Rights will trade. Holders of Units will need to have their brokers contact Continental Stock Transfer & Trust Company, the Company’s transfer agent, in order to separate the holders’ Units into Class A Ordinary Shares and Rights.

A copy of the press release issued by the Company announcing the separate trading of the securities underlying the Units is attached hereto as Exhibit 99.1.

Item 9.01 Financial Statements and Exhibits.

Exhibit No.		Description of Exhibits
99.1		Press Release, dated November 18, 2025.

104		Cover Page Interactive Data File (embedded within the Inline XBRL document).

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

	StoneBridge Acquisition II Corporation

	By:	/s/ Bhargav Marepally
	Name:	Bhargav Marepally
	Title:	Chief Executive Officer

Date: November 18, 2025

StoneBridge Acquisition II Corp 8-K