MITSUI SUMITOMO INSURANCE CO LTD - 04 Dec 2025 Form 3 Insider Report for BERKLEY W R CORP (WRB)

Role
10%+ Owner
Signature
MITSUI SUMITOMO INSURANCE CO., LTD., By: /s/ Hironori Morimoto, Name: Hironori Morimoto, Title: Authorized Signatory
Issuer symbol
WRB
Transactions as of
04 Dec 2025
Net transactions value
$0
Form type
3
Filing time
11 Dec 2025, 17:05:50 UTC
Next filing
22 Dec 2025
SEC
View on sec.gov

Reporting Owners (2)

Name Relationship Address Signature Signature date CIK
MITSUI SUMITOMO INSURANCE CO LTD 10%+ Owner 9, KANDA-SURUGADAI 3-CHOME, CHIYODA-KU, TOKYO, JAPAN MITSUI SUMITOMO INSURANCE CO., LTD., By: /s/ Hironori Morimoto, Name: Hironori Morimoto, Title: Authorized Signatory 11 Dec 2025 0001142206
MS&AD Insurance Group Holdings, Inc. 10%+ Owner TOKYO SUMITOMO TWIN BUILDING, 27-2,, SHINKAWA 2-CHOME,, CHUO-KU, TOKYO,, JAPAN MS&AD INSURANCE GROUP HOLDINGS, INC., By: /s/ Hironori Morimoto, Name: Hironori Morimoto, Title: Authorized Signatory 11 Dec 2025 0001431048

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
holding WRB Common Stock 48,601,588 04 Dec 2025 Direct F1
* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id Content
F1 The shares are held directly by Mitsui Sumitomo Insurance Co., Ltd. ("MSI"). Because MSI is a wholly-owned subsidiary of MS&AD Insurance Group Holdings, Inc. ("MS&AD"), MS&AD may be deemed to beneficially own the reported securities. MS&AD expressly disclaims beneficial ownership of the reported securities, except to the extent of its pecuniary interest therein.

Remarks:

MSI, the Issuer and WR Berkley & Others LLC ("WRBO") are party to certain agreements described in, and filed as exhibits to, the Reporting Persons' Schedule 13D filed with the U.S. Securities and Exchange Commission on the date hereof. The Reporting Persons disclaim beneficial ownership of the securities of the Issuer owned by WRBO and disclaim that the Reporting Persons and WRBO constitute a "group" within the meaning of Rule 13d-5(b)(1) under the Securities Exchange Act of 1934, as amended.