MITSUI SUMITOMO INSURANCE CO LTD - 04 Mar 2026 SCHEDULE 13D/A 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
374,397,771 shares
Disclosed Ownership
58,780,450 shares
Ownership
16%
Form type
SCHEDULE 13D/A
Filing time
05 Mar 2026, 07:00:04 UTC
Date of event
04 Mar 2026
Previous filing
06 Feb 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. 16% 58,780,450 58,780,450 0 /s/ Hironori Morimoto Hironori Morimoto/Authorized Signatory 0001142206
MS&AD Insurance Group Holdings, Inc. 16% 58,780,450 0 58,780,450 /s/ Hironori Morimoto Hironori Morimoto/Authorized Signatory 0001431048