MITSUI SUMITOMO INSURANCE CO LTD - 04 Dec 2025 SCHEDULE 13D Report for W. R. BERKLEY CORPORATION Common Stock, par value $0.20 per share (WRB)

Filing Manager
MITSUI SUMITOMO INSURANCE CO LTD
Reporting Manager
Mitsui Sumitomo Insurance Co., Ltd.
Security
W. R. BERKLEY CORPORATION Common Stock, par value $0.20 per share
Symbol
WRB
Shares outstanding
379,699,906 shares
Disclosed Ownership
48,601,588 shares
Ownership
13%
Form type
SCHEDULE 13D
Filing time
11 Dec 2025, 17:03:26 UTC
Date of event
04 Dec 2025
Next filing
14 Jan 2026
SEC
View on sec.gov

Reporting Managers (2)

Name Ownership Shares Owned sole voting power shared voting power Signature Title CIK
Mitsui Sumitomo Insurance Co., Ltd. 13% 48,601,588 48,601,588 0 /s/ Hironori Morimoto Hironori Morimoto/Authorized Signatory 0001142206
MS&AD Insurance Group Holdings, Inc. 13% 48,601,588 0 48,601,588 /s/ Hironori Morimoto Hironori Morimoto/Authorized Signatory 0001431048