Company: APACU
Filing Date: 2025-08-22
Form Type: S-1/A
Source: 0001829126-25-006654
Chunk: 0

Company: StoneBridge Acquisition II Corp
Filing Date: 2025-08-22
Form: S-1/A
Chunk 0
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<div align='center'>As filed with the Securities and Exchange Commission on August 22, 2025.</div>

Registration No. 333-286983

<div align='center'>UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

AMENDMENT NO. 3 TO
FORM S-1

REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933

StoneBridge Acquisition II Corporation

(Exact name of registrant as specified in its charter)</div>

| Cayman Islands                  |     |                         6770 |     | Not Applicable        |
| (State or other jurisdiction of 
 incorporation or organization)  |     | -Primary Standard Industrial 
   Classification Code Number |     | -I.R.S. Employer      
 Identification Number |

<div align='center'>One World Trade Center
Suite 8500
New York, New York 10007
Tel: (646) 314-3555

(Address, including zip code, and telephone number, including area code, of registrant’s principal executive offices)

Prabhu Antony
One World Trade Center
Suite 8500
New York, New York 10007
Tel: (646) 314-3555

(Name, address, including zip code, and telephone number, including area code, of agent for service)

Copies to:</div>

| Kelvin Kesse             
 Kesse PLLC               
 845 Texas Ave, Suite 200 
 Houston, Texas 77002     
 Tel: (346) 348-0239      |     | Simon Raftopoulos                  
 Alexandra Low                      
 Appleby (Cayman) Ltd.              
 9th Floor, 60 Nexus Way Camana Bay 
 Grand Cayman, KY1-1104             
 Tel: (345) 949-4900                |     | Mitchell S. Nussbaum     
 David J. Levine          
 Loeb & Loeb LLP          
 345 Park Avenue          
 New York, New York 10154 
 Tel: (212) 407-4000      |

Approximate date of commencement of proposed sale to the public:As soon as practicable after the effective date of this registration statement.

If any of the securities being registered on this Form are to be offered on a delayed or continuous basis pursuant to Rule 415 under the Securities Act of 1933 check the following box. ☐

If this Form is filed to register additional securities for an offering pursuant to Rule 462(b)