W. R. Berkley Corp (WRB)

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Insider transactions

A complete record of Form 4 filings tracking every share acquisition and disposal by executives, directors, and senior officers. Filterable by date range and transaction type, the table exposes the direct market actions of those with the deepest knowledge of a company's operations — providing a factual, data-driven signal of internal conviction that complements traditional fundamental and technical analysis.

Transaction date	Executive	Executive Title	Security Type	Acquisition / Disposal	Shares	Share price
Aug 3, 2026	SHIEL, JAMES G	EVP - Investments	Common Stock	Acquisition	14,086	$0
Aug 3, 2026	BAIO, RICHARD MARK	EVP & CFO	Common Stock	Acquisition	14,086	$0
Aug 3, 2026	SHIEL, JAMES G	EVP - Investments	Common Stock	Disposal	650	$72.29
Aug 3, 2026	BERKLEY, WILLIAM R JR	Director, Chairman, President and CEO, 10% Owner	Common Stock	Disposal	4,139	$72.29
Aug 3, 2026	WELT, PHILIP S	EVP & Secretary	Common Stock	Disposal	592	$72.29
Aug 3, 2026	BERKLEY, WILLIAM R JR	Director, Chairman, President and CEO, 10% Owner	Common Stock	Acquisition	98,593	$0
Aug 3, 2026	BAIO, RICHARD MARK	EVP & CFO	Common Stock	Disposal	650	$72.29
Aug 3, 2026	WELT, PHILIP S	EVP & Secretary	Common Stock	Acquisition	14,086	$0
Jun 3, 2026	TALISMAN, JONATHAN	Director	Common Stock	Acquisition	3,090	$0
Jun 3, 2026	FERRE, MARIA LUISA	Director	Common Stock	Acquisition	3,090	$0
Jun 3, 2026	BERKLEY, WILLIAM R JR	Director, President and CEO	Common Stock	Acquisition	3,090	$0
Jun 3, 2026	MOSLEY, DANIEL LYNN	Director	Common Stock	Acquisition	3,090	$0
Jun 3, 2026	AUGOSTINI, CHRISTOPHER L	Director	Common Stock	Acquisition	3,090	$0
Jun 3, 2026	MATTSON, MARIE ANGELA	Director	Common Stock	Acquisition	3,090	$0
Jun 3, 2026	RUSBULDT, ROBERT ALAN	Director	Common Stock	Acquisition	3,090	$0
Jun 3, 2026	BERKLEY, WILLIAM R	Director, Executive Chairman, 10% Owner	Common Stock	Acquisition	3,090	$0
Jun 3, 2026	FARRELL, MARY C	Director	Common Stock	Acquisition	3,090	$0
Jun 3, 2026	BLAYLOCK, RONALD E	Director	Common Stock	Acquisition	3,090	$0
Mar 3, 2026	MITSUI, SUMITOMO INSURANCE CO LTD	10% Owner	Common Stock	Acquisition	38,991	$71.60
Mar 3, 2026	MITSUI, SUMITOMO INSURANCE CO LTD	10% Owner	Common Stock	Acquisition	73,185	$72.52
Mar 2, 2026	MITSUI, SUMITOMO INSURANCE CO LTD	10% Owner	Common Stock	Acquisition	45,103	$72.29
Mar 2, 2026	MITSUI, SUMITOMO INSURANCE CO LTD	10% Owner	Common Stock	Acquisition	100,897	$73.20
Feb 27, 2026	MITSUI, SUMITOMO INSURANCE CO LTD	10% Owner	Common Stock	Acquisition	147,000	$71.63
Feb 26, 2026	MITSUI, SUMITOMO INSURANCE CO LTD	10% Owner	Common Stock	Acquisition	145,491	$71.65
Feb 26, 2026	MITSUI, SUMITOMO INSURANCE CO LTD	10% Owner	Common Stock	Acquisition	7,509	$72.11
Feb 25, 2026	MITSUI, SUMITOMO INSURANCE CO LTD	10% Owner	Common Stock	Acquisition	14,356	$71.77
Feb 25, 2026	MITSUI, SUMITOMO INSURANCE CO LTD	10% Owner	Common Stock	Acquisition	154,512	$71.39
Feb 24, 2026	MITSUI, SUMITOMO INSURANCE CO LTD	10% Owner	Common Stock	Acquisition	103,192	$70.52
Feb 24, 2026	MITSUI, SUMITOMO INSURANCE CO LTD	10% Owner	Common Stock	Acquisition	61,594	$71.28
Feb 23, 2026	MITSUI, SUMITOMO INSURANCE CO LTD	10% Owner	Common Stock	Acquisition	203,590	$71.09
Feb 23, 2026	MITSUI, SUMITOMO INSURANCE CO LTD	10% Owner	Common Stock	Acquisition	16,410	$71.80
Feb 20, 2026	MITSUI, SUMITOMO INSURANCE CO LTD	10% Owner	Common Stock	Acquisition	160,582	$70.80
Feb 19, 2026	MITSUI, SUMITOMO INSURANCE CO LTD	10% Owner	Common Stock	Acquisition	300,986	$70.53
Feb 19, 2026	MITSUI, SUMITOMO INSURANCE CO LTD	10% Owner	Common Stock	Acquisition	44,014	$71.50
Feb 18, 2026	MITSUI, SUMITOMO INSURANCE CO LTD	10% Owner	Common Stock	Acquisition	45,250	$70.96
Feb 18, 2026	MITSUI, SUMITOMO INSURANCE CO LTD	10% Owner	Common Stock	Acquisition	239,750	$70.58
Feb 17, 2026	MITSUI, SUMITOMO INSURANCE CO LTD	10% Owner	Common Stock	Acquisition	281,386	$71.19
Feb 13, 2026	MITSUI, SUMITOMO INSURANCE CO LTD	10% Owner	Common Stock	Acquisition	4,314	$70.30
Feb 13, 2026	MITSUI, SUMITOMO INSURANCE CO LTD	10% Owner	Common Stock	Acquisition	15,406	$69.73
Feb 13, 2026	MITSUI, SUMITOMO INSURANCE CO LTD	10% Owner	Common Stock	Acquisition	280	$71.18
Feb 12, 2026	MITSUI, SUMITOMO INSURANCE CO LTD	10% Owner	Common Stock	Acquisition	2,401	$72.76
Feb 12, 2026	MITSUI, SUMITOMO INSURANCE CO LTD	10% Owner	Common Stock	Acquisition	17,599	$71.88
Feb 11, 2026	MITSUI, SUMITOMO INSURANCE CO LTD	10% Owner	Common Stock	Acquisition	3,578	$70.50
Feb 11, 2026	MITSUI, SUMITOMO INSURANCE CO LTD	10% Owner	Common Stock	Acquisition	9,289	$69.59
Feb 11, 2026	MITSUI, SUMITOMO INSURANCE CO LTD	10% Owner	Common Stock	Acquisition	11,163	$71.45
Feb 10, 2026	MITSUI, SUMITOMO INSURANCE CO LTD	10% Owner	Common Stock	Acquisition	12,082	$69.92
Feb 10, 2026	MITSUI, SUMITOMO INSURANCE CO LTD	10% Owner	Common Stock	Acquisition	21,884	$69.09
Feb 9, 2026	MITSUI, SUMITOMO INSURANCE CO LTD	10% Owner	Common Stock	Acquisition	4,048	$70.32
Feb 9, 2026	MITSUI, SUMITOMO INSURANCE CO LTD	10% Owner	Common Stock	Acquisition	35,952	$69.27
Feb 6, 2026	MITSUI, SUMITOMO INSURANCE CO LTD	10% Owner	Common Stock	Acquisition	15,694	$70.46
Feb 6, 2026	MITSUI, SUMITOMO INSURANCE CO LTD	10% Owner	Common Stock	Acquisition	4,306	$71.39
Feb 5, 2026	MITSUI, SUMITOMO INSURANCE CO LTD	10% Owner	Common Stock	Acquisition	6,528	$70.79
Feb 5, 2026	MITSUI, SUMITOMO INSURANCE CO LTD	10% Owner	Common Stock	Acquisition	13,472	$71.25
Feb 4, 2026	MITSUI, SUMITOMO INSURANCE CO LTD	10% Owner	Common Stock	Acquisition	2,585	$69.77
Feb 4, 2026	MITSUI, SUMITOMO INSURANCE CO LTD	10% Owner	Common Stock	Acquisition	22,415	$70.25
Feb 3, 2026	MITSUI, SUMITOMO INSURANCE CO LTD	10% Owner	Common Stock	Acquisition	8,347	$67.75
Feb 3, 2026	MITSUI, SUMITOMO INSURANCE CO LTD	10% Owner	Common Stock	Acquisition	31,653	$68.87
Feb 2, 2026	MITSUI, SUMITOMO INSURANCE CO LTD	10% Owner	Common Stock	Acquisition	13,159	$68.42
Feb 2, 2026	MITSUI, SUMITOMO INSURANCE CO LTD	10% Owner	Common Stock	Acquisition	237,062	$67.71
Jan 30, 2026	MITSUI, SUMITOMO INSURANCE CO LTD	10% Owner	Common Stock	Acquisition	195,000	$68.36
Jan 29, 2026	MITSUI, SUMITOMO INSURANCE CO LTD	10% Owner	Common Stock	Acquisition	27,718	$68.56
Jan 29, 2026	MITSUI, SUMITOMO INSURANCE CO LTD	10% Owner	Common Stock	Acquisition	262,282	$68.08
Jan 28, 2026	MITSUI, SUMITOMO INSURANCE CO LTD	10% Owner	Common Stock	Acquisition	28,577	$67.89
Jan 28, 2026	MITSUI, SUMITOMO INSURANCE CO LTD	10% Owner	Common Stock	Acquisition	280,354	$67.58
Jan 27, 2026	MITSUI, SUMITOMO INSURANCE CO LTD	10% Owner	Common Stock	Acquisition	8,582	$68.56
Jan 27, 2026	MITSUI, SUMITOMO INSURANCE CO LTD	10% Owner	Common Stock	Acquisition	2,671	$69.04
Jan 27, 2026	MITSUI, SUMITOMO INSURANCE CO LTD	10% Owner	Common Stock	Acquisition	11,987	$66.87
Jan 27, 2026	MITSUI, SUMITOMO INSURANCE CO LTD	10% Owner	Common Stock	Acquisition	800	$65.86
Jan 27, 2026	MITSUI, SUMITOMO INSURANCE CO LTD	10% Owner	Common Stock	Acquisition	325,960	$67.40
Jan 26, 2026	MITSUI, SUMITOMO INSURANCE CO LTD	10% Owner	Common Stock	Acquisition	76,389	$67.88
Jan 26, 2026	MITSUI, SUMITOMO INSURANCE CO LTD	10% Owner	Common Stock	Acquisition	293,611	$66.86
Jan 23, 2026	MITSUI, SUMITOMO INSURANCE CO LTD	10% Owner	Common Stock	Acquisition	201,081	$66.77
Jan 23, 2026	MITSUI, SUMITOMO INSURANCE CO LTD	10% Owner	Common Stock	Acquisition	166,919	$67.18
Jan 22, 2026	MITSUI, SUMITOMO INSURANCE CO LTD	10% Owner	Common Stock	Acquisition	330,000	$67.45
Jan 21, 2026	MITSUI, SUMITOMO INSURANCE CO LTD	10% Owner	Common Stock	Acquisition	260,998	$67.60
Jan 21, 2026	MITSUI, SUMITOMO INSURANCE CO LTD	10% Owner	Common Stock	Acquisition	59,002	$66.95
Jan 20, 2026	MITSUI, SUMITOMO INSURANCE CO LTD	10% Owner	Common Stock	Acquisition	44,994	$68.08
Jan 20, 2026	MITSUI, SUMITOMO INSURANCE CO LTD	10% Owner	Common Stock	Acquisition	265,006	$67.75
Jan 16, 2026	MITSUI, SUMITOMO INSURANCE CO LTD	10% Owner	Common Stock	Acquisition	58,691	$68.79
Jan 16, 2026	MITSUI, SUMITOMO INSURANCE CO LTD	10% Owner	Common Stock	Acquisition	241,309	$68.03
Jan 15, 2026	MITSUI, SUMITOMO INSURANCE CO LTD	10% Owner	Common Stock	Acquisition	68,093	$69.45
Jan 15, 2026	MITSUI, SUMITOMO INSURANCE CO LTD	10% Owner	Common Stock	Acquisition	166,907	$68.68
Jan 14, 2026	MITSUI, SUMITOMO INSURANCE CO LTD	10% Owner	Common Stock	Acquisition	21,728	$68.80
Jan 14, 2026	MITSUI, SUMITOMO INSURANCE CO LTD	10% Owner	Common Stock	Acquisition	208,272	$69.23
Jan 13, 2026	MITSUI, SUMITOMO INSURANCE CO LTD	10% Owner	Common Stock	Acquisition	118,501	$67.82
Jan 13, 2026	MITSUI, SUMITOMO INSURANCE CO LTD	10% Owner	Common Stock	Acquisition	206,499	$68.15
Jan 12, 2026	MITSUI, SUMITOMO INSURANCE CO LTD	10% Owner	Common Stock	Acquisition	256,041	$68.73
Jan 9, 2026	MITSUI, SUMITOMO INSURANCE CO LTD	10% Owner	Common Stock	Acquisition	8,150	$70.12
Jan 9, 2026	MITSUI, SUMITOMO INSURANCE CO LTD	10% Owner	Common Stock	Acquisition	105,674	$69.56
Jan 9, 2026	MITSUI, SUMITOMO INSURANCE CO LTD	10% Owner	Common Stock	Acquisition	161,176	$68.48
Jan 8, 2026	MITSUI, SUMITOMO INSURANCE CO LTD	10% Owner	Common Stock	Acquisition	151,511	$70.32
Jan 8, 2026	MITSUI, SUMITOMO INSURANCE CO LTD	10% Owner	Common Stock	Acquisition	39,302	$69.69
Jan 8, 2026	MITSUI, SUMITOMO INSURANCE CO LTD	10% Owner	Common Stock	Acquisition	4,187	$68.79
Jan 7, 2026	MITSUI, SUMITOMO INSURANCE CO LTD	10% Owner	Common Stock	Acquisition	254,622	$68.47
Jan 7, 2026	MITSUI, SUMITOMO INSURANCE CO LTD	10% Owner	Common Stock	Acquisition	10,378	$69.20
Jan 6, 2026	MITSUI, SUMITOMO INSURANCE CO LTD	10% Owner	Common Stock	Acquisition	92,357	$70.21
Jan 6, 2026	MITSUI, SUMITOMO INSURANCE CO LTD	10% Owner	Common Stock	Acquisition	122,931	$69.93
Jan 5, 2026	MITSUI, SUMITOMO INSURANCE CO LTD	10% Owner	Common Stock	Acquisition	11,350	$69.20
Jan 5, 2026	MITSUI, SUMITOMO INSURANCE CO LTD	10% Owner	Common Stock	Acquisition	153,686	$70.78
Jan 5, 2026	MITSUI, SUMITOMO INSURANCE CO LTD	10% Owner	Common Stock	Acquisition	35,894	$70.23
Jan 2, 2026	MITSUI, SUMITOMO INSURANCE CO LTD	10% Owner	Common Stock	Acquisition	237,734	$69.35
Dec 31, 2025	MITSUI, SUMITOMO INSURANCE CO LTD	10% Owner	Common Stock	Acquisition	230,000	$70.27
Dec 30, 2025	MITSUI, SUMITOMO INSURANCE CO LTD	10% Owner	Common Stock	Acquisition	205,000	$70.83
Dec 29, 2025	MITSUI, SUMITOMO INSURANCE CO LTD	10% Owner	Common Stock	Acquisition	205,000	$70.77
Dec 26, 2025	MITSUI, SUMITOMO INSURANCE CO LTD	10% Owner	Common Stock	Acquisition	220,000	$70.56
Dec 24, 2025	MITSUI, SUMITOMO INSURANCE CO LTD	10% Owner	Common Stock	Acquisition	220,000	$70.51
Dec 23, 2025	MITSUI, SUMITOMO INSURANCE CO LTD	10% Owner	Common Stock	Acquisition	232,546	$70.31
Dec 23, 2025	MITSUI, SUMITOMO INSURANCE CO LTD	10% Owner	Common Stock	Acquisition	2,027	$71.15
Dec 22, 2025	MITSUI, SUMITOMO INSURANCE CO LTD	10% Owner	Common Stock	Acquisition	39,940	$69.97
Dec 22, 2025	MITSUI, SUMITOMO INSURANCE CO LTD	10% Owner	Common Stock	Acquisition	162,060	$70.33
Dec 19, 2025	MITSUI, SUMITOMO INSURANCE CO LTD	10% Owner	Common Stock	Acquisition	204,000	$69.50
Dec 18, 2025	MITSUI, SUMITOMO INSURANCE CO LTD	10% Owner	Common Stock	Acquisition	204,350	$69.38
Dec 18, 2025	SHIEL, JAMES G	EVP - Investments	Common Stock	Disposal	1,250	$0