W. R. Berkley (BSAA) files Schedule 13G/A showing 7.3% stake in BEST SPAC I

Rhea-AI Filing Summary

W. R. Berkley Corporation amended its Schedule 13G to report beneficial ownership of 437,808 shares of BEST SPAC I Acquisition Corp. Class A ordinary shares, representing 7.3% of the class as of 03/31/2026. The filing names Berkley Insurance Company as the acquiring subsidiary and is signed by Richard M. Baio on 05/07/2026.

Key Figures

Shares beneficially owned: 437,808 shares Percent of class: 7.3% CUSIP: G1069P103 +3 more

6 metrics

Shares beneficially owned 437,808 shares Class A ordinary shares, as of 03/31/2026

Percent of class 7.3% Percent of BEST SPAC I Class A ordinary shares

CUSIP G1069P103 Identifier for BEST SPAC I Class A ordinary shares

Filing signature date 05/07/2026 Signed by Richard M. Baio, EVP and CFO/Treasurer

Shared voting power 437,808 shares Shared power to vote or to direct the vote

Shared dispositive power 437,808 shares Shared power to dispose or to direct disposition

Key Terms

Schedule 13G/A, beneficially owned, shared dispositive power, CUSIP

4 terms

Schedule 13G/A regulatory

"Amendment No. 1 BEST SPAC I Acquisition Corp."

A Schedule 13G/A is an amended public filing with the U.S. securities regulator that updates a previous Schedule 13G, disclosing when an individual or group holds a substantial (typically over 5%) stake in a company and is claiming a passive, non‑controlling intent. Investors monitor these updates because rising or falling holdings can signal changing confidence, potential future moves, or shifts in voting power — like watching a public ledger where large shareholders quietly adjust their positions.

beneficially owned financial

"Amount beneficially owned: 437,808"

Beneficially owned describes securities or assets where a person has the economic rights and control—such as the right to receive dividends and to direct voting—even if legal title is held in another name. Think of it like having the keys and using a car that’s registered to someone else: you get the benefits and make decisions. Investors care because beneficial ownership reveals who truly controls value and voting power, affecting corporate decisions and takeover dynamics.

shared dispositive power regulatory

"Shared Dispositive Power 437,808.00"

CUSIP technical

"CUSIP No.: G1069P103"

A CUSIP is a nine-character alphanumeric code that uniquely identifies a U.S. or Canadian financial security—such as a stock, bond, or fund share—like a Social Security number for an investment. It matters to investors because brokers, exchanges and record-keepers use the CUSIP to match trades, track ownership, settle transactions and pull accurate records, reducing errors and ensuring money and securities go to the right place.

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Accepted by SEC EDGAR 05/07/2026 - 05:11 PM Learn about SEC filing dates

FAQ

What stake does W. R. Berkley (BSAA) report in BEST SPAC I?

W. R. Berkley reports 437,808 shares, equal to 7.3% of BEST SPAC I Class A ordinary shares. The Schedule 13G/A lists the position with CUSIP G1069P103 and an ownership date of 03/31/2026.

Who holds the shares on behalf of W. R. Berkley in the filing?

The filing identifies Berkley Insurance Company as the subsidiary with shared voting and dispositive power over 437,808 shares. W. R. Berkley is the reporting parent holding company listed on the Schedule 13G/A.

When was the Schedule 13G/A for BSAA signed and filed?

The amendment is signed by Richard M. Baio on 05/07/2026. The ownership figure is reported as of 03/31/2026, and the cover references CUSIP G1069P103 for the Class A ordinary shares.

What voting and disposition powers are reported for the 7.3% stake?

W. R. Berkley reports 0 sole voting/dispositive power and 437,808 shared voting and dispositive powers. The Schedule 13G/A shows the position is exercised jointly or shared rather than held with sole authority.

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

(Amendment No. 1)

BEST SPAC I Acquisition Corp.

(Name of Issuer)

Class A ordinary shares, no par value

(Title of Class of Securities)

G1069P103

(CUSIP Number)

03/31/2026

(Date of Event Which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule is filed:

Rule 13d-1(b)

Rule 13d-1(c)

Rule 13d-1(d)

schemaVersion:

SCHEDULE 13G

CUSIP Number(s): G1069P103

1

Names of Reporting Persons

W.R. Berkley Corporation

2

Check the appropriate box if a member of a Group (see instructions)

(a)
(b)

3

Sec Use Only

4

Citizenship or Place of Organization

DELAWARE

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 437,808.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 437,808.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

437,808.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

7.3 %

12

Type of Reporting Person (See Instructions)

CO

SCHEDULE 13G

CUSIP Number(s): G1069P103

1

Names of Reporting Persons

Berkley Insurance Company

2

Check the appropriate box if a member of a Group (see instructions)

(a)
(b)

3

Sec Use Only

4

Citizenship or Place of Organization

DELAWARE

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 437,808.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 437,808.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

437,808.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

7.3 %

12

Type of Reporting Person (See Instructions)

CO, IC

SCHEDULE 13G

Item 1.
(a)	Name of issuer: BEST SPAC I Acquisition Corp.
(b)	Address of issuer's principal executive offices: 701, 7/Floor, United Building, 17-19 Jubilee Street, Hong Kong, HONG KONG
Item 2.
(a)	Name of person filing: W. R. Berkley Corporation
(b)	Address or principal business office or, if none, residence: 475 Steamboat Road Greenwich, CT 06830
(c)	Citizenship: US
(d)	Title of class of securities: Class A ordinary shares, no par value
(e)	CUSIP No.: G1069P103
Item 3.	If this statement is filed pursuant to §§ 240.13d-1(b) or 240.13d-2(b) or (c), check whether the person filing is a:
(a)	Broker or dealer registered under section 15 of the Act (15 U.S.C. 78o);
(b)	Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c);
(c)	Insurance company as defined in section 3(a)(19) of the Act (15 U.S.C. 78c);
(d)	Investment company registered under section 8 of the Investment Company Act of 1940 (15 U.S.C. 80a-8);
(e)	An investment adviser in accordance with § 240.13d-1(b)(1)(ii)(E);
(f)	An employee benefit plan or endowment fund in accordance with § 240.13d-1(b)(1)(ii)(F);
(g)	A parent holding company or control person in accordance with § 240.13d-1(b)(1)(ii)(G);
(h)	A savings associations as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813);
(i)	A church plan that is excluded from the definition of an investment company under section 3(c)(14) of the Investment Company Act of 1940 (15 U.S.C. 80a-3);
(j)	A non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J). If filing as a non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J), please specify the type of institution:
(k)	Group, in accordance with Rule 240.13d-1(b)(1)(ii)(K).
Item 4.	Ownership
(a)	Amount beneficially owned: 437,808
(b)	Percent of class: 7.3 %
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: 0
	(ii) Shared power to vote or to direct the vote: 437,808
	(iii) Sole power to dispose or to direct the disposition of: 0
	(iv) Shared power to dispose or to direct the disposition of: 437,808
Item 5.	Ownership of 5 Percent or Less of a Class.
	Not Applicable
Item 6.	Ownership of more than 5 Percent on Behalf of Another Person.
	Not Applicable
Item 7.	Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company or Control Person.
	If a parent holding company has filed this schedule, pursuant to Rule 13d-1(b)(ii)(G), so indicate under Item 3(g) and attach an exhibit stating the identity and the Item 3 classification of the relevant subsidiary. If a parent holding company has filed this schedule pursuant to Rule 13d-1(c) or Rule 13d-1(d), attach an exhibit stating the identification of the relevant subsidiary. See Exhibit 99.1
Item 8.	Identification and Classification of Members of the Group.
	Not Applicable
Item 9.	Notice of Dissolution of Group.
	Not Applicable

Item 10.

Certifications:

By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were acquired and are held in the ordinary course of business and were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under ?? 240.14a-11.

SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

W.R. Berkley Corporation

Signature:	/s/ Richard M. Baio
Name/Title:	Richard M. Baio/Executive Vice President and Chief Financial Officer
Date:	05/07/2026

Berkley Insurance Company

Signature:	/s/ Richard M. Baio
Name/Title:	Richard M. Baio/Executive Vice President and Treasurer
Date:	05/07/2026