William R. Berkley - 04 Mar 2026 SCHEDULE 13D/A Report for W. R. BERKLEY CORPORATION Common Stock, par value $0.20 per share (WRB)

Filing Manager
William R. Berkley
Reporting Manager
William R. Berkley
Security
W. R. BERKLEY CORPORATION Common Stock, par value $0.20 per share
Symbol
WRB
Shares outstanding
374,563,481 shares
Disclosed Ownership
95,551,144 shares
Ownership
26%
Form type
SCHEDULE 13D/A
Filing time
05 Mar 2026, 08:00:02 UTC
Date of event
04 Mar 2026
Previous filing
11 Dec 2025
SEC
View on sec.gov

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Quoteable Key Fact

"William R. Berkley disclosed 26% ownership in W. R. BERKLEY CORPORATION Common Stock, par value $0.20 per share (WRB) on 04 Mar 2026."

Quick Takeaways

  • William R. Berkley filed SCHEDULE 13D/A for W. R. BERKLEY CORPORATION Common Stock, par value $0.20 per share (WRB).
  • Disclosed ownership: 26%.
  • Date of event: 04 Mar 2026.

What Changed

  • Previous schedule filing date: 11 Dec 2025.
  • Current filing was accepted on 05 Mar 2026, 08:00.

Why This Matters

  • This page explains what this Schedule 13D/13G filing tells you before manager-level rows.
  • You can verify ownership claims directly against the original SEC filing.

Official SEC Source

Backed by Schedule 13D/13G

Beneficial ownership values are sourced from the original SEC Schedule 13D/13G filing.

See Original Filing

Reporting Managers (8)

Name Ownership Shares Owned sole voting power shared voting power Signature Title CIK
WR Berkley & Others LLC 26% 95,551,144 63,515,547 32,035,597 /s/ W. Robert Berkley, Jr. W. Robert Berkley, Jr. /Manager
WR Berkley & Others 2 LLC 26% 95,551,144 3,553,486 91,997,658 /s/ W. Robert Berkley, Jr. W. Robert Berkley, Jr. / Manager
William R. Berkley 26% 95,551,144 17,363,285 78,187,859 /s/ William R. Berkley William R. Berkley 0000918186
Marjorie J. Berkley 26% 95,551,144 204,364 95,346,780 /s/ Marjorie J. Berkley Marjorie J. Berkley
W. Robert Berkley, Jr. 26% 95,551,144 4,552,770 90,998,374 /s/ W. Robert Berkley, Jr. W. Robert Berkley, Jr.
The William R. Berkley 2011 GST Trust u/a dated December 20, 2011 26% 95,551,144 1,350,000 94,201,144 /s/ W. Robert Berkley, Jr. W. Robert Berkley, Jr. /Trustee
The William R. Berkley 2022 Family Trust f/b/o William R. Berkley, Jr. and His Issue 26% 95,551,144 4,287,201 91,263,943 /s/ Marjorie J. Berkley Marjorie J. Berkley/Trustee
The William R. Berkley 2022 Family Trust f/b/o Lauren Berkley and Her Issue 26% 95,551,144 724,491 94,826,653 /s/ Marjorie J. Berkley Marjorie J. Berkley/Trustee

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