MITSUI SUMITOMO INSURANCE CO LTD - 13 Jan 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
379,327,367 shares
Disclosed Ownership
52,726,504 shares
Ownership
14%
Form type
SCHEDULE 13D/A
Filing time
14 Jan 2026, 21:51:38 UTC
Date of event
13 Jan 2026
Previous filing
11 Dec 2025
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. 14% 52,726,504 52,726,504 0 /s/ Hironori Morimoto Hironori Morimoto/Authorized Signatory 0001142206
MS&AD Insurance Group Holdings, Inc. 14% 52,726,504 0 52,726,504 /s/ Hironori Morimoto Hironori Morimoto/Authorized Signatory 0001431048