SEC Form 4 · Updated Daily

WRB

— W. R. BERKLEY CORPORATION Ownership

Insider and institutional ownership derived from SEC Form 4 filings. Click any owner to see their holdings across every company they’ve filed on, and how their position has changed over time.

Financials Ownership

Current Reporting Owners

Owner	Role	Shares Owned	As Of	Last Activity
MITSUI SUMITOMO INSURANCE CO LTD	10%+ Owner	58,780,450	2026-03-03	P
MS&AD Insurance Group Holdings, Inc.	10%+ Owner	58,780,450	2026-03-03	P
BERKLEY WILLIAM R	10%+ Owner · Director · Officer	17,366,375	2026-06-03	A
BERKLEY WILLIAM R JR	Director · Officer	4,654,453	2026-08-03	A
SHIEL JAMES G	Officer	811,283	2026-08-03	A
BALLARD EUGENE G	Officer	251,656	2017-08-07	F
Sgaglione Lucille T	Officer	241,753	2025-08-15	A
LEDERMAN IRA S	Officer	240,031	2019-12-11	G
Baio Richard Mark	Officer	228,261	2026-08-03	A
COLE ROBERT P	Officer	217,669	2010-03-02	A
Welt Philip S	Officer	214,625	2026-08-03	A
NUSBAUM JACK H	Director	149,799	2020-06-12	A
PATAFIO CLEMENT P	Officer	126,883	2012-12-17	P
BLAYLOCK RONALD E	Director	121,990	2026-06-03	A
Augostini Christopher L	Director	109,859	2026-06-03	A
HANCOCK PAUL J	Officer	103,062	2010-03-02	M
HEWITT ROBERT C	Officer	85,000	2010-03-02	A
Stone Robert Daly	Officer	76,698	2010-03-02	A
Ferre Maria Luisa	Director	59,234	2026-06-03	A
Madsen Carl Fred	Officer	50,500	2010-03-02	A
GOSSELINK ROBERT W	Officer	50,000	2010-03-02	A
Taylor Steven William	Officer	41,000	2010-03-02	A
DALY GEORGE G	Director	40,822	2016-11-21	G
LaPunzina Carol Josephine	Officer	34,813	2010-03-02	A
Talisman Jonathan	Director	33,180	2026-06-03	A
Kamford Peter Lind	Officer	31,419	2008-06-17	A
HAWES RODNEY A JR	Director	20,500	2011-05-17	A
Farrell Mary C	Director	19,378	2026-06-03	A
Pusey Leigh Ann	Officer	15,761	2021-12-01	M
RICCIARDI MATTHEW M	Officer	15,561	2018-05-15	F
Hafter Jeffrey Marc	Officer	15,000	2010-05-03	A
Mosley Daniel Lynn	Director	14,885	2026-06-03	A
ABLOVE PHILIP J	Director	11,739	2008-05-28	A
James Gillian B	Officer	10,000	2009-12-03	A
Mattson Marie Angela	Director	9,667	2026-06-03	A
Ebers Kevin H	Officer	8,197	2010-05-18	I
BROCKBANK MARK ELLWOOD	Director	6,000	2022-08-01	P
Rusbuldt Robert Alan	Director	5,866	2026-06-03	A
SHAPIRO MARK L	Director	2,534	2024-06-12	A
Carrier Andrew	Director	0	2026-06-03	—

Recent Filings

Date	Owner	Activity	Shares	Price	Owned After
2026-08-03	SHIEL JAMES G	Tax withholding	650	$72.29	810,633
2026-08-03	SHIEL JAMES G	Grant / award	14,086	$0.00	811,283
2026-08-03	BERKLEY WILLIAM R JR	Tax withholding	4,139	$72.29	4,650,314
2026-08-03	BERKLEY WILLIAM R JR	Grant / award	98,593	$0.00	4,654,453
2026-08-03	Baio Richard Mark	Tax withholding	650	$72.29	227,611
2026-08-03	Baio Richard Mark	Grant / award	14,086	$0.00	228,261
2026-08-03	Welt Philip S	Tax withholding	592	$72.29	214,033
2026-08-03	Welt Philip S	Grant / award	14,086	$0.00	214,625
2026-06-03	Carrier Andrew	—	—	—	0
2026-06-03	Talisman Jonathan	Grant / award	3,090	$0.00	33,180
2026-06-03	BLAYLOCK RONALD E	Grant / award	3,090	$0.00	121,990
2026-06-03	Augostini Christopher L	Grant / award	3,090	$0.00	109,859
2026-06-03	Rusbuldt Robert Alan	Grant / award	3,090	$0.00	5,866
2026-06-03	Farrell Mary C	Grant / award	3,090	$0.00	19,378
2026-06-03	Mosley Daniel Lynn	Grant / award	3,090	$0.00	14,885
2026-06-03	BERKLEY WILLIAM R JR	Grant / award	3,090	$0.00	4,555,860
2026-06-03	Mattson Marie Angela	Grant / award	3,090	$0.00	9,667
2026-06-03	Ferre Maria Luisa	Grant / award	3,090	$0.00	59,234
2026-06-03	BERKLEY WILLIAM R	Grant / award	3,090	$0.00	17,366,375
2026-03-03	MS&AD Insurance Group Holdings, Inc.	Open-market buy	73,185	$72.52	58,780,450
2026-03-03	MS&AD Insurance Group Holdings, Inc.	Open-market buy	38,991	$71.60	58,707,265
2026-03-03	MITSUI SUMITOMO INSURANCE CO LTD	Open-market buy	73,185	$72.52	58,780,450
2026-03-03	MITSUI SUMITOMO INSURANCE CO LTD	Open-market buy	38,991	$71.60	58,707,265
2026-03-02	MS&AD Insurance Group Holdings, Inc.	Open-market buy	100,897	$73.20	58,668,274
2026-03-02	MS&AD Insurance Group Holdings, Inc.	Open-market buy	45,103	$72.29	58,567,377
2026-03-02	MITSUI SUMITOMO INSURANCE CO LTD	Open-market buy	100,897	$73.20	58,668,274
2026-03-02	MITSUI SUMITOMO INSURANCE CO LTD	Open-market buy	45,103	$72.29	58,567,377
2026-02-27	MS&AD Insurance Group Holdings, Inc.	Open-market buy	147,000	$71.63	58,522,274
2026-02-27	MITSUI SUMITOMO INSURANCE CO LTD	Open-market buy	147,000	$71.63	58,522,274
2026-02-26	MS&AD Insurance Group Holdings, Inc.	Open-market buy	7,509	$72.11	58,375,274
2026-02-26	MS&AD Insurance Group Holdings, Inc.	Open-market buy	145,491	$71.65	58,367,765
2026-02-26	MITSUI SUMITOMO INSURANCE CO LTD	Open-market buy	7,509	$72.11	58,375,274
2026-02-26	MITSUI SUMITOMO INSURANCE CO LTD	Open-market buy	145,491	$71.65	58,367,765
2026-02-25	MS&AD Insurance Group Holdings, Inc.	Open-market buy	14,356	$71.77	58,222,274
2026-02-25	MS&AD Insurance Group Holdings, Inc.	Open-market buy	154,512	$71.39	58,207,918
2026-02-25	MITSUI SUMITOMO INSURANCE CO LTD	Open-market buy	14,356	$71.77	58,222,274
2026-02-25	MITSUI SUMITOMO INSURANCE CO LTD	Open-market buy	154,512	$71.39	58,207,918
2026-02-24	MS&AD Insurance Group Holdings, Inc.	Open-market buy	61,594	$71.28	58,053,406
2026-02-24	MS&AD Insurance Group Holdings, Inc.	Open-market buy	103,192	$70.52	57,991,812
2026-02-24	MITSUI SUMITOMO INSURANCE CO LTD	Open-market buy	61,594	$71.28	58,053,406

Source: SEC EDGAR Form 4 filings. For informational purposes only — not investment advice.