Company: BSAAR
Filing Date: 2025-03-28
Form Type: S-1
Source: 0001013762-25-004269
Chunk: 380

Company: BEST SPAC I Acquisition Corp.
Filing Date: 2025-03-28
Form: S-1
Chunk 380
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 of determining liability of a registrant under the Securities Act of 1933 to any purchaser in the initial distribution of the securities, the undersigned registrant undertakes that in a primary offering of securities of an undersigned registrant pursuant to this registration statement, regardless of the underwriting method used to sell the securities to the purchaser, if the securities are offered or sold to such purchaser by means of any of the following communications, the undersigned registrant will be a seller to the purchaser and will be considered to offer or sell such securities to such purchaser: (i)Any preliminary prospectus or prospectus of the undersigned registrant relating to the offering required to be filed pursuant to Rule 424; (ii)Any free writing prospectus relating to the offering prepared by or on behalf of the undersigned registrant or used or referred to by an undersigned registrant; II-2 (iii)The portion of any other free writing prospectus relating to the offering containing material information about the undersigned registrant or its securities provided by or on behalf of the undersigned registrant; and (iv)Any other communication that is an offer in the offering made by the undersigned registrant to the purchaser. II-3

SIGNATURES Pursuant to the requirements of the Securities Act of 1933, as amended, the registrant has duly caused this Registration Statement to be signed on its behalf by the undersigned, thereunto duly authorized, in the City of New York, State of New York, on the 28 day of March, 2025.

| BEST SPAC I Acquisition Corp. |     |                                       |
| By:                           |     | /s/ Xiangge Liu                       |
| Name:                         |     | Xiangge Liu                           |
| Title:                        |     | Chairman, Chief Executive Officer and 
 Chief Financial Officer               |

Pursuant to the requirements of the Securities Act of 1933, as amended, this Registration Statement has been signed below by the following person in the capacities on March28, 2025.

| Name            |     | Position                                                      |
| /s/ Xiangge Liu |     | Chairman, Chief Executive Officer and Chief Financial Officer |
| Xiangge Liu     |     | -Principal Executive, Financial and Accounting Officer        |

II-4

AUTHORIZED U.S. REPRESENTATIVE Pursuant to the Securities Act of 1933, as amended, the undersigned, the duly authorized representative in the U.S. of BEST SPAC I Acquisition Corp