Yun Chen - 29 Sep 2026 Form 4 Insider Report for BEST SPAC I Acquisition Corp. (BSAA)

Reporting relationship: 10%+ Owner
Issuer ticker: BSAA
Reported as of: 29 Sep 2026
Net transaction value: $0
SEC form: 4
Accepted by SEC: 29 Sep 2026, 16:45:03 UTC
Source filing: View source filing
Reporting owner signature: /s/ Yun Chen

Key filing fact

Yun Chen filed Form 4 for BEST SPAC I Acquisition Corp. (BSAA) on 29 Sep 2026.

Key facts

This page summarizes Yun Chen's Form 4 filing for BEST SPAC I Acquisition Corp. (BSAA).
3 reported transactions and 2 derivative rows are listed below.
Accepted by SEC: 29 Sep 2026, 16:45.

Change

No earlier filing in this sequence is available for direct comparison.
Current net transaction value: $0.

Research use

This tells you what this filing adds before you inspect full transaction and derivative tables.
You can trace every row back to the original SEC filing document.

Evidence

Filed on Form 4

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (1)

CIK 0002153415 Primary reporting owner

Chen Yun

Relationship: 10%+ Owner
Address: 701, 7 FLR, UNITED BLDG 17-19 JUBILEE ST, CENTRAL, HONG KONG
Signature: /s/ Yun Chen
Signature date: 29 Sep 2026

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

BSAA transaction

Class A ordinary shares

Other

Transaction value
Shares: -277,000
Change %: -100%
Price
Shares after: 0
Date: 29 Sep 2026
Ownership: See Footnote
Footnotes: F1

Reported derivative securities

Options, warrants, convertible securities, or similar derivative positions disclosed in the filing.

BSAA transaction Derivative

Class B ordinary shares

Other

Transaction value
Shares: -1,375,000
Change %: -100%
Price
Shares after: 0
Date: 29 Sep 2026
Ownership: See Footnote
Underlying class: Class A ordinary shares
Underlying amount: 1,375,000
Exercise price
Footnotes: F1, F2

BSAA transaction Derivative

Rights to receive Class A ordinary shares

Other

Transaction value
Shares: -277,000
Change %: -100%
Price
Shares after: 0
Date: 29 Sep 2026
Ownership: See Footnote
Underlying class: Class A ordinary shares
Underlying amount: 27,700
Exercise price
Footnotes: F1, F3

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Section 16 status

Yun Chen is no longer subject to Section 16 filing requirements. Form 4 or Form 5 obligations may still apply in specific circumstances.

Explanation of responses 3 footnotes

Footnote F1

On September 29, 2026, Naoda Investments Limited, of which Mr. Yun Chen serves as the sole director, sold 100% of its interests in BEST SPAC I (Holdings) Corp., the sponsor of BEST SPAC I Acquisition Corp. (the "Issuer"), to A SPAC (Holdings) Group Corp. for $1. Mr. Chen was previously deemed a beneficial owner of the Issuer's securities by virtue of having shared voting and dispositive power with Kam Chi Kin over the securities held by the sponsor. Mr. Chen did not previously file a Form 3 with respect to such indirect beneficial ownership. As of the date of this report, Mr. Chen no longer has any voting or dispositive power over the Issuer's securities held by BEST SPAC I (Holdings) Corp.

Footnote 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.

Footnote 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.