BEST SPAC I Sponsor Acquired by A SPAC Holdings

A SPAC (Holdings) Group Corp. acquired 100% of the Sponsor’s issued and outstanding ordinary shares from Naoda Investments Limited.

Rhea-AI Filing Summary

BEST SPAC I Acquisition Corp. (BSAA) securities are reported as indirectly held by BEST SPAC I (Holdings) Corp. (the Sponsor): 1,375,000 Class B ordinary shares, 277,000 Class A ordinary shares and 27,700 rights to receive Class A ordinary shares, as of September 29, 2026. That day, A SPAC (Holdings) Group Corp. acquired 100% of the Sponsor’s issued and outstanding ordinary shares from Naoda Investments Limited. Claudius Tsang, a director of A SPAC (Holdings) Group Corp. and the Sponsor’s sole director, shares voting and dispositive power over the Sponsor-held securities with Kam Chi Kin; Tsang disclaims beneficial ownership except to the extent of his pecuniary interest. The Class B shares convert one-for-one at the initial business combination or earlier at the holder’s option, subject to adjustment; each right entitles its holder to one-tenth of a Class A share upon consummation.

Insider Trade Summary

3 transactions reported

Mixed 3 txns

Insider Tsang Claudius

Role 10% Owner

Type	Security	Shares	Price	Value
holding	Class B ordinary shares F2, F1	--	--	--
holding	Rights to receive Class A ordinary shares F3, F1	--	--	--
holding	Class A ordinary shares F1	--	--	--

Holdings After Transaction: Class B ordinary shares — 1,375,000 contracts (Indirect, See Footnote); Rights to receive Class A ordinary shares — 27,700 contracts (Indirect, See Footnote); Class A ordinary shares — 277,000 shares (Indirect, See Footnote)

Footnotes (3)

1. F1. 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. F2. 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. F3. 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.

Key Figures

Class B ordinary shares: 1,375,000 shares Class A ordinary shares: 277,000 shares Rights to receive Class A ordinary shares: 27,700 rights +3 more

6 metrics

Class B ordinary shares 1,375,000 shares Held indirectly by the Sponsor as of September 29, 2026

Class A ordinary shares 277,000 shares Held indirectly by the Sponsor as of September 29, 2026

Rights to receive Class A ordinary shares 27,700 rights Held indirectly by the Sponsor as of September 29, 2026

Sponsor ordinary shares acquired 100% A SPAC (Holdings) Group Corp. acquired them from Naoda Investments Limited on September 29, 2026

Class B conversion ratio One-for-one At the initial business combination or earlier at the holder’s option, subject to adjustment

Class A share entitlement per right One-tenth (1/10) of one Class A ordinary share Upon consummation of the issuer’s initial business combination

Key Terms

initial business combination, voting and dispositive power, beneficial ownership, pecuniary interest

4 terms

initial business combination financial

"at the time of the Issuer's initial business combination"

An initial business combination is the deal in which a special-purpose acquisition company (SPAC) merges with or acquires an operating business to bring that business onto public markets. Think of the SPAC as an empty shell that raises money from investors, then uses that cash to buy a private company—this transaction turns the private company into a public one and often changes its ownership, valuation, and access to capital, so investors should watch for shifts in risk, future growth prospects, and shareholder rights.

voting and dispositive power regulatory

"shares voting and dispositive power over the securities held by the Sponsor"

beneficial ownership regulatory

"disclaims any beneficial ownership in the securities held by the Sponsor"

Beneficial ownership means the person or entity that actually enjoys the benefits of owning shares or other assets — such as receiving dividends, voting rights, or price gains — even if the legal title is held in another name. For investors it matters because knowing who truly controls and profits from a company reveals who can influence decisions, exposes potential conflicts of interest or hidden concentration of power, and affects transparency and risk in the stock.

pecuniary interest financial

"except to the extent of his pecuniary interest therein"

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What BSAA securities does the Sponsor hold?

BEST SPAC I (Holdings) Corp. held 1,375,000 Class B ordinary shares, 277,000 Class A ordinary shares and 27,700 rights to receive Class A ordinary shares as of September 29, 2026.

How do BSAA Class B shares and rights convert?

The Class B ordinary shares automatically convert into Class A ordinary shares one-for-one at the initial business combination, or earlier at the holder’s option, subject to adjustment. Each right entitles its holder to one-tenth of one Class A ordinary share upon consummation; the rights expire worthless if BSAA does not consummate an initial business combination within the required time period.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Available on EDGAR 09/29/2026 - 04:45 PM Accepted by SEC EDGAR 09/29/2026 - 04:45 PM Learn about SEC filing dates

SEC 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

OMB APPROVAL

OMB Number:			3235-0104
Estimated average burden
hours per response:			0.5

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)
	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
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)