Company: BSAAR
Filing Date: 2025-09-26
Form Type: 425
Source: 0001493152-25-015072
Chunk: 0

Company: BEST SPAC I Acquisition Corp.
Filing Date: 2025-09-26
Form: 425
Chunk 0
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<div align='center'>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

September 25, 2025

Date of Report (Date of earliest event reported)

BEST SPAC I Acquisition Corp.

(Exact Name of Registrant as Specified in its Charter)</div>

| British               
 Virgin Islands        |     | 001-42700   |     | N/A00-0000000      |
| (State                
 or other jurisdiction 
 of incorporation)     |     | -Commission 
 File        
 Number      |     | -I.R.S.            
 Employer           
 Identification No. |

| 701, 7/Floor                    
 United                          
 Building                        
 17-19                           
 Jubilee Street                  
 Hong Kong                       |     | N/A00000 |
| (Address                        
 of Principal Executive Offices) |     | -Zip     
 Code     |

<div align='center'>Registrant’s telephone number, including area code: +852 9828 3397

N/A

(Former name or former address, if changed since last report)</div>

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    |
| ☐ | Soliciting                                                      
 material pursuant to Rule 14a-12 under the Exchange Act         |
| ☐ | Pre-commencement                                                
 communications pursuant to Rule 14d-2(b) under the Exchange Act |
| ☐ | Pre-commencement                                                
 communications pursuant to Rule 13e-4(c) under the Exchange Act |

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, with no par value, and one right to receive one-tenth of one Class A ordinary share |     | BSAAU   |     | The                                  
 Nasdaq Stock Market LLC              |
| Class                                                                                                                              
 A ordinary shares                                                                                                                  |     | BSAA    |     | The                                  
 Nasdaq Stock Market LLC              |
| Rights                                                                                                                             |