W.R. Berkley Corporation (WRB) Insider Trading

Last 12 months

No open-market buying or selling by insiders.

The last open-market buy by an executive or director was in Aug 2022.

Net open-market

0 buys · 0 sales

Under a 10b5-1 plan

—

no sales

Insiders who bought / sold

0 / 0

executives and directors

Last open-market buy

Aug 2022

Aug 1, 2022

Get an email when WRB's executives or directors buy, or make a large sale outside a plan.

Trades · last 2 years

Date	Insider	Trade	Shares	Price	Value	Of their stake	Filing
Mar 2 – 3	Mitsui Sumitomo Insurance CO LTD Large holder	Bought 4 parts	258,176	$72.61 average	$18.7M	0.4%	Form 4
Feb 26 – 27	Mitsui Sumitomo Insurance CO LTD Large holder	Bought 3 parts	300,000	$71.65 average	$21.5M	0.5%	Form 4
Feb 23 – 25	Ms&ad Insurance Group Holdings, Inc. Large holder	Bought 6 parts	553,654	$71.13 average	$39.4M	1.0%	Form 4
Feb 19 – 20	Ms&ad Insurance Group Holdings, Inc. Large holder	Bought 3 parts	505,582	$70.70 average	$35.7M	0.9%	Form 4
Feb 17 – 18	Mitsui Sumitomo Insurance CO LTD Large holder	Bought 3 parts	566,386	$70.91 average	$40.2M	1.0%	Form 4
Feb 12 – 13	Ms&ad Insurance Group Holdings, Inc. Large holder	Bought 5 parts	40,000	$70.93 average	$2.84M	<0.1%	Form 4
Feb 9 – 11	Ms&ad Insurance Group Holdings, Inc. Large holder	Bought 7 parts	97,996	$69.68 average	$6.83M	0.2%	Form 4
Feb 5 – 6	Ms&ad Insurance Group Holdings, Inc. Large holder	Bought 4 parts	40,000	$70.88 average	$2.84M	<0.1%	Form 4
Feb 2 – 4	Mitsui Sumitomo Insurance CO LTD Large holder	Bought 6 parts	315,221	$68.05 average	$21.5M	0.6%	Form 4
Jan 29 – 30	Mitsui Sumitomo Insurance CO LTD Large holder	Bought 3 parts	485,000	$68.22 average	$33.1M	0.9%	Form 4
Jan 26 – 28	Ms&ad Insurance Group Holdings, Inc. Large holder	Bought 9 parts	1,028,931	$67.35 average	$69.3M	1.9%	Form 4
Jan 22 – 23	Ms&ad Insurance Group Holdings, Inc. Large holder	Bought 3 parts	698,000	$67.19 average	$46.9M	1.3%	Form 4
Jan 20 – 21	Ms&ad Insurance Group Holdings, Inc. Large holder	Bought 4 parts	630,000	$67.64 average	$42.6M	1.2%	Form 4
Jan 15 – 16	Ms&ad Insurance Group Holdings, Inc. Large holder	Bought 4 parts	535,000	$68.50 average	$36.6M	1.0%	Form 4
Jan 12 – 14	Mitsui Sumitomo Insurance CO LTD Large holder	Bought 5 parts	811,041	$68.58 average	$55.6M	1.6%	Form 4
Jan 8 – 9	Mitsui Sumitomo Insurance CO LTD Large holder	Bought 6 parts	470,000	$69.45 average	$32.6M	0.9%	Form 4
Jan 5 – 7	Mitsui Sumitomo Insurance CO LTD Large holder	Bought 7 parts	681,218	$69.61 average	$47.4M	1.3%	Form 4
Dec 30, 2025 – Jan 2	Ms&ad Insurance Group Holdings, Inc. Large holder	Bought 3 parts	672,734	$70.12 average	$47.2M	1.3%	Form 4
Dec 23, 2025 – Dec 29, 2025	Mitsui Sumitomo Insurance CO LTD Large holder	Bought 5 parts	879,573	$70.53 average	$62M	1.8%	Form 4
Dec 18, 2025 – Dec 22, 2025	Ms&ad Insurance Group Holdings, Inc. Large holder	Bought 4 parts	610,350	$69.71 average	$42.5M	1.3%	Form 4

Mar 2 – 3
Mitsui Sumitomo Insurance CO LTD
Large holder · bought 258,176 at avg $72.61
$18.7M
0.4% of stake
Feb 26 – 27
Mitsui Sumitomo Insurance CO LTD
Large holder · bought 300,000 at avg $71.65
$21.5M
0.5% of stake
Feb 23 – 25
Ms&ad Insurance Group Holdings, Inc.
Large holder · bought 553,654 at avg $71.13
$39.4M
1.0% of stake
Feb 19 – 20
Ms&ad Insurance Group Holdings, Inc.
Large holder · bought 505,582 at avg $70.70
$35.7M
0.9% of stake
Feb 17 – 18
Mitsui Sumitomo Insurance CO LTD
Large holder · bought 566,386 at avg $70.91
$40.2M
1.0% of stake
Feb 12 – 13
Ms&ad Insurance Group Holdings, Inc.
Large holder · bought 40,000 at avg $70.93
$2.84M
<0.1% of stake
Feb 9 – 11
Ms&ad Insurance Group Holdings, Inc.
Large holder · bought 97,996 at avg $69.68
$6.83M
0.2% of stake
Feb 5 – 6
Ms&ad Insurance Group Holdings, Inc.
Large holder · bought 40,000 at avg $70.88
$2.84M
<0.1% of stake
Feb 2 – 4
Mitsui Sumitomo Insurance CO LTD
Large holder · bought 315,221 at avg $68.05
$21.5M
0.6% of stake
Jan 29 – 30
Mitsui Sumitomo Insurance CO LTD
Large holder · bought 485,000 at avg $68.22
$33.1M
0.9% of stake
Jan 26 – 28
Ms&ad Insurance Group Holdings, Inc.
Large holder · bought 1,028,931 at avg $67.35
$69.3M
1.9% of stake
Jan 22 – 23
Ms&ad Insurance Group Holdings, Inc.
Large holder · bought 698,000 at avg $67.19
$46.9M
1.3% of stake
Jan 20 – 21
Ms&ad Insurance Group Holdings, Inc.
Large holder · bought 630,000 at avg $67.64
$42.6M
1.2% of stake
Jan 15 – 16
Ms&ad Insurance Group Holdings, Inc.
Large holder · bought 535,000 at avg $68.50
$36.6M
1.0% of stake
Jan 12 – 14
Mitsui Sumitomo Insurance CO LTD
Large holder · bought 811,041 at avg $68.58
$55.6M
1.6% of stake
Jan 8 – 9
Mitsui Sumitomo Insurance CO LTD
Large holder · bought 470,000 at avg $69.45
$32.6M
0.9% of stake
Jan 5 – 7
Mitsui Sumitomo Insurance CO LTD
Large holder · bought 681,218 at avg $69.61
$47.4M
1.3% of stake
Dec 30, 2025 – Jan 2
Ms&ad Insurance Group Holdings, Inc.
Large holder · bought 672,734 at avg $70.12
$47.2M
1.3% of stake
Dec 23, 2025 – Dec 29, 2025
Mitsui Sumitomo Insurance CO LTD
Large holder · bought 879,573 at avg $70.53
$62M
1.8% of stake
Dec 18, 2025 – Dec 22, 2025
Ms&ad Insurance Group Holdings, Inc.
Large holder · bought 610,350 at avg $69.71
$42.5M
1.3% of stake

How to read this. Insiders sell for many reasons: taxes, diversifying, a house. Open-market buys are rarer and say more. A 10b5-1 plan is a trading schedule set up months in advance, so those sales were not timed on news. Large holders (funds and 10% owners) are listed under Everything but not counted as insiders. If you own or watch WRB, we send a push when an executive buys or makes a large sale outside a plan.

Source: SEC Form 4 filings, filed within two business days of each trade and checked for new ones every hour.

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Spot a number that looks wrong? Check it in WRB's SEC filings or

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Data sourced from SEC EDGAR filings and third-party price providers. Scores, valuations, and metrics are algorithmic estimates. This is not investment advice. See our Terms and Methodology.

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