SCHEDULE 13G 0002051637 XXXXXXXX LIVE Class A Ordinary Shares, no par value 07/30/2025 0002051587 BEST SPAC I Acquisition Corp. G1069P103 701, 7/Floor, United Building 17-19 Jubilee Street HONG KONG K3 00000 Rule 13d-1(d) BEST SPAC I (Holdings) Corp. D8 0.00 1652000.00 0.00 1652000.00 1652000.00 N 22.3 OO The 1,652,000 shares referred to in Rows 6, 8 and 9 includes the Issuer's Class B ordinary shares with no par value ("Class B Ordinary Shares") which are automatically convertible into the Issuer's Class A ordinary shares with no par value ("Class A Ordinary Shares") immediately following the Issuer's initial business combination (the "Business Combination") and may be converted at any time prior to the Business Combination at the option of the holder, as more fully described under the heading "Description of Securities " in the Issuer's Registration Statement on Form S-1 (File No. 333- 286237). Mr. Yun Chen and Mr. Kam Chi Kin share voting and dispositive power over the securities held of record by BEST SPAC I (Holdings) Corp. The percentage in Row 11 is based on 6,024,500 Class A Ordinary Shares, including Class A Ordinary Shares underlying the units, and 1,375,000 Class B Ordinary Shares issued and outstanding as of July 30, 2025. Yun Chen F4 0.00 1652000.00 0.00 1652000.00 1652000.00 N 22.3 IN The 1,652,000 shares referred to in Rows 6, 8 and 9 includes the Issuer's Class B Ordinary Shares which are automatically convertible into the Issuer's Class A Ordinary Shares immediately following the Issuer's Business Combination and may be converted at any time prior to the Business Combination at the option of the holder, as more fully described under the heading "Description of Securities " in the Issuer's Registration Statement on Form S-1 (File No. 333- 286237). Mr. Yun Chen and Mr. Kam Chi Kin share voting and dispositive power over the securities held of record by BEST SPAC I (Holdings) Corp. The percentage in Row 11 is based on 6,024,500 Class A Ordinary Shares, including Class A Ordinary Shares underlying the units, and 1,375,000 Class B Ordinary Shares issued and outstanding as of July 30, 2025. Kam Chi Kin F4 0.00 1652000.00 0.00 1652000.00 1652000.00 N 22.3 IN The 1,652,000 shares referred to in Rows 6, 8 and 9 includes both the Issuer's Class B Ordinary Shares which are automatically convertible into the Issuer's Class A Ordinary Shares immediately following the Issuer's Business Combination and may be converted at any time prior to the Business Combination at the option of the holder, as more fully described under the heading "Description of Securities " in the Issuer's Registration Statement on Form S-1 (File No. 333- 286237). Mr. Yun Chen and Mr. Kam Chi Kin share voting and dispositive power over the securities held of record by BEST SPAC I (Holdings) Corp. The percentage in Row 11 is based on 6,024,500 Class A Ordinary Shares, including Class A Ordinary Shares underlying the units, and 1,375,000 Class B Ordinary Shares issued and outstanding as of July 30, 2025. BEST SPAC I Acquisition Corp. 701, 7/Floor, United Building, 17-19 Jubilee Street, Hong Kong BEST SPAC I (Holdings) Corp., Yun Chen and Kam Chi Kin (collectively, the "Reporting Persons") 701, 7/Floor, United Building, 17-19 Jubilee Street, Hong Kong BEST SPAC I (Holdings) Corp. is a British Virgin Islands company. Yun Chen is a citizen of the People's Republic of China. Kam Chi Kin is a citizen of Macau, China. Y As of July 30, 2025, the Reporting Persons may be deemed to beneficially own 1,652,000 of the Issuer's Class A Ordinary Shares and Class B Ordinary Shares. BEST SPAC I (Holdings) Corp. is the record holder of the ordinary shares reported herein. Mr. Yun Chen is the sole director of BEST SPAC I (Holdings) Corp. and directs its day-to-day operations. Mr. Kam Chi Kin and Mr. Yun Chen share voting and dispositive power with respect to the securities held of record by BEST SPAC I (Holdings) Corp., and they may be deemed the beneficial owners of the securities held by BEST SPAC I (Holdings) Corp. This Statement shall not be construed as an admission that the Reporting Persons are, for purposes of Section 13(d) and 13(g), beneficial owners of any securities covered by this Statement. The 1,652,000of the Issuer's Class A Ordinary Shares and Class B Ordinary Shares owned by the Reporting Persons constitute 22.3% of the total number of Class A Ordinary Shares and Class B Ordinary Shares issued and outstanding, assuming the conversion of all issued and outstanding Class B Ordinary Shares of the Issuer. The Class B Ordinary Shares are automatically convertible into Class A Ordinary Shares with or immediately following the Business Combination on a one-for-one basis and may be converted at any time prior to the Business Combination at the option of the holder on a one-for-one basis, subject to certain adjustments, as more fully described under the heading "Description of Securities" in the Issuer's Registration Statement on Form S-1 (File No. 333-286237). The percentage of the total ordinary shares held is based on 6,024,500 Class A Ordinary Shares, including Class A Ordinary Shares underlying the units, and 1,375,000 Class B Ordinary Shares issued and outstanding as of July 30, 2025, assuming the conversion of all Class B Ordinary Shares. 0 1,652,000 0 1,652,000 Y Y Y Y Y Y EXHIBIT LIST Exhibit A Joint Filing Agreement, dated as of August 1, 2025. BEST SPAC I (Holdings) Corp. /s/ Yun Chen 08/01/2025 Yun Chen /s/ Yun Chen 08/01/2025 Kam Chi Kin /s/ Kam Chi Kin 08/01/2025