SEC FORM 3

SEC FORM 3SEC Form 3

FORM 3

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person^*

Tsang Claudius

(Last)

(First)

(Middle)

C/O BEST SPAC I ACQUISITION CORP.

701, 7 FLR, UNITED BLDG 17-19 JUBILEE ST

(Street)

HONG KONG

(City)

(State)

(Zip)

HONG KONG

(Country)

2. Date of Event Requiring Statement (Month/Day/Year)
09/29/2026

3. Issuer Name and Ticker or Trading Symbol
BEST SPAC I Acquisition Corp. [ BSAA ]

3a. Foreign Trading Symbol

5. If Amendment, Date of Original Filed (Month/Day/Year)

4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

Director	X	10% Owner
Officer (give title below)		Other (specify below)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Beneficially Owned
1. Title of Security (Instr. 4)	2. Amount of Securities Beneficially Owned (Instr. 4)	3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	4. Nature of Indirect Beneficial Ownership (Instr. 5)
Class A ordinary shares	277,000	I	See Footnote⁽¹⁾

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 4)	2. Date Exercisable and Expiration Date (Month/Day/Year)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
1. Title of Derivative Security (Instr. 4)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	4. Conversion or Exercise Price of Derivative Security	5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
Class B ordinary shares	⁽²⁾	⁽²⁾	Class A ordinary shares	1,375,000	⁽²⁾	I	See Footnote⁽¹⁾
Rights to receive Class A ordinary shares	⁽³⁾	⁽³⁾	Class A ordinary shares	27,700	⁽³⁾	I	See Footnote⁽¹⁾

Explanation of Responses:

1. The securities reported herein are held by BEST SPAC I (Holdings) Corp. ("Sponsor"). On September 29, 2026, A SPAC (Holdings) Group Corp. acquired from Naoda Investments Limited 100% of Sponsor's issued and outstanding ordinary shares. In connection with such acquisition, Claudius Tsang, a director of A SPAC (Holdings) Group Corp., was appointed the sole director of the Sponsor and shares voting and dispositive power over the securities held by the Sponsor with Kam Chi Kin . The reporting person disclaims any beneficial ownership in the securities held by the Sponsor, except to the extent of his pecuniary interest therein.

2. The Class B ordinary shares will automatically convert into Class A ordinary shares at the time of the Issuer's initial business combination, or earlier at the option of the holder, on a one-for-one basis, subject to adjustment. The Class B ordinary shares have no expiration date.

3. Each holder of a right will receive one-tenth (1/10) of one Class A ordinary share upon consummation of the Issuer's initial business combination. The rights will expire worthless if the Issuer does not consummate an initial business combination within the required time period.

	/s/ Claudius Tsang	09/29/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 5 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 3: SEC 1473 (03-26)