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

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.

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.

Backed by Schedule 13D/13G

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

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