Company: BSAAR
Filing Date: 2025-09-26
Form Type: 425
Source: 0001493152-25-015072
Chunk: 12

Company: BEST SPAC I Acquisition Corp.
Filing Date: 2025-09-26
Form: 425
Chunk 12
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10.3*   |     | Form of Lock-Up Agreement                                                                                                           |
| 104     |     | Cover                                                                                                                               
 Page Interactive Data File (embedded within the Inline XBRL document)                                                               |

| * | Schedules                                                                                                                          
 and exhibits have been omitted pursuant to Item 601(b)(2) of Regulation S-K. The registrant hereby undertakes to furnish copies of 
 any of the omitted schedules and exhibits upon request by the U.S. Securities and Exchange Commission.                             |

<div align='center'>SIGNATURE</div>

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.

| Dated:             
 September 26, 2025 | BEST                     
 SPAC I ACQUISITION CORP. 
 By:                      | /s/                                           
 Xiangge Liu                                   |
|:-------------------|:-------------------------|:----------------------------------------------|
|                    | Name:                    | Xiangge                                       
 Liu                                           |
|                    | Title:                   | Chief                                         
 Executive Officer and Chief Financial Officer |