WRBNYSE

BERKLEY W R CORP

Fire, Marine & Casualty Insurance · DE · CIK 11544

W. R. Berkley Corporation underwrites commercial insurance and reinsurance business globally

red 8-K · 90d

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$26.83B

Market cap

$72.08

Last close

+2.0%

+4.0%

1.9M

Volume

Price$72.08+1.9%· 1Y

Jul 2L $63.54 · H $78.46Jul 2

261

Total filings

Jun 26, 2026

Last filing

12/31

Fiscal year end

All 8-K · 121 10-Q · 40 424B5 · 24 DEFA14A · 22 10-K · 14 11-K · 14 DEF 14A · 14 SC 13G · 12

11-K11-KJun 25, 2026 11-K11-KJun 25, 2025 11-K11-KJun 25, 2024 11-K11-KJun 28, 2023 11-K11-KJun 29, 2022 11-K

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Insider Activity

◇ Past cluster · as of Mar 3, 2026

Date	Insider	Action	Shares	Price	Value
Mar 3, 2026	Mitsui Sumitomo Insurance Co LtdTenPercentOwner	Buy	73,185	$72.52	$5.3M
Mar 3, 2026	Mitsui Sumitomo Insurance Co LtdTenPercentOwner	Buy	38,991	$71.60	$2.8M
Mar 2, 2026	Mitsui Sumitomo Insurance Co LtdTenPercentOwner	Buy	100,897	$73.20	$7.4M
Mar 2, 2026	Mitsui Sumitomo Insurance Co LtdTenPercentOwner	Buy	45,103	$72.29	$3.3M
Feb 27, 2026	Mitsui Sumitomo Insurance Co LtdTenPercentOwner	Buy	147,000	$71.63	$10.5M
Feb 26, 2026	Mitsui Sumitomo Insurance Co LtdTenPercentOwner	Buy	145,491	$71.65	$10.4M
Feb 26, 2026	Mitsui Sumitomo Insurance Co LtdTenPercentOwner	Buy	7,509	$72.11	$541K
Feb 25, 2026	Ms&Ad Insurance Group Holdings, Inc.TenPercentOwner	Buy	154,512	$71.39	$11.0M
Feb 25, 2026	Ms&Ad Insurance Group Holdings, Inc.TenPercentOwner	Buy	14,356	$71.77	$1.0M
Feb 24, 2026	Ms&Ad Insurance Group Holdings, Inc.TenPercentOwner	Buy	103,192	$70.52	$7.3M
Feb 24, 2026	Ms&Ad Insurance Group Holdings, Inc.TenPercentOwner	Buy	61,594	$71.28	$4.4M
Feb 23, 2026	Ms&Ad Insurance Group Holdings, Inc.TenPercentOwner	Buy	203,590	$71.09	$14.5M
Feb 23, 2026	Ms&Ad Insurance Group Holdings, Inc.TenPercentOwner	Buy	16,410	$71.80	$1.2M
Feb 20, 2026	Ms&Ad Insurance Group Holdings, Inc.TenPercentOwner	Buy	160,582	$70.80	$11.4M
Feb 19, 2026	Ms&Ad Insurance Group Holdings, Inc.TenPercentOwner	Buy	300,986	$70.53	$21.2M
Feb 19, 2026	Ms&Ad Insurance Group Holdings, Inc.TenPercentOwner	Buy	44,014	$71.50	$3.1M
Feb 18, 2026	Mitsui Sumitomo Insurance Co LtdTenPercentOwner	Buy	239,750	$70.58	$16.9M
Feb 18, 2026	Mitsui Sumitomo Insurance Co LtdTenPercentOwner	Buy	45,250	$70.96	$3.2M
Feb 17, 2026	Mitsui Sumitomo Insurance Co LtdTenPercentOwner	Buy	281,386	$71.19	$20.0M
Feb 13, 2026	Ms&Ad Insurance Group Holdings, Inc.TenPercentOwner	Buy	15,406	$69.73	$1.1M

Open-market buys & sells (Form 4, transaction codes P/S). Source: SEC structured insider data.

What Changed

Risk factors · Feb 24, 2025 → Feb 27, 2026

44 added · 9 removed between the two most recent 10-Ks. The risks a company starts — or stops — disclosing are often the story.

Newly disclosed

As we make significant investments in AI and related technology and increasingly rely on the use of AI by third parties, we may not achieve the expected operational and other benefits, or such benefits may take longer than anticipated, and our competitors may adopt AI technologies more effectively or efficiently than we do, which may adversely affect our market position and results of operations.
Our investment in and use of AI technologies and the introduction of new products and services may also expose us to new or enhanced risks, particularly in areas where we have less experience or our existing internal control systems may be insufficient, which could require us to make substantial expenditures or subject us to legal liability, heightened regulatory scrutiny and brand or reputational harm.
("MSI"), which owns approximately 14.7% of our common stock as of February 23, 2026, has entered into voting and other arrangements with members of the Berkley family, such that the Berkley family can, subject to certain exceptions, determine the voting of the Company shares held by MSI, including with respect to an 40 extraordinary transaction, other than one expected to result in a business combination that would give rise to a significant, direct and irresolvable conflict of interest for MSI.
As described in “International Regulation” above, the EU has adopted amendments to certain provisions in Solvency II, which EU member states are in the process of implementing in their domestic regulation over 2025 and 2026.
For example, catastrophe models that simulate loss estimates based on a set of assumptions are important tools used to estimate our exceedance probability curves.
For example, we consider estimates of probability of exceedance and deterministic scenarios for certain events that are generated by computer-run models.
Adverse economic factors, including recessions, inflation, periods of high unemployment, the impact of tariffs or lower economic activity could result in the sale of fewer policies than expected or an increase in frequency or severity of claims and premium defaults or both, which, in turn, could affect our growth and profitability.
In an economic downturn that is characterized by higher unemployment, declining spending and reduced corporate revenues, the demand for insurance products is generally adversely affected, which directly affects our premium levels and profitability.
Negative economic factors may also affect our ability to receive the appropriate rate for the risk we insure with our policyholders and may adversely affect the number of policies we can write, including with respect to our opportunities to underwrite profitable business.
Changes in the value of the U.S. dollar relative to other currencies have had and could in the future have an adverse effect on our results of operations and financial condition. 34 Our investments in non-U.S.-denominated assets are subject to fluctuations in non-U.S. securities and currency markets, and those markets can be volatile.
These assumptions address a number of factors that impact loss potential including, but not limited to, the characteristics of a given natural catastrophe event; the increase in claim costs resulting from limited supply of labor and materials needed for repairs following a catastrophe event (demand surge); the types, function, location and characteristics of exposed risks; susceptibility of exposed risks to damage from an event with specific characteristics; and the financial and contractual provisions of the (re)insurance contracts that cover losses arising from an event.
We run many model simulations in order to understand the impact of these assumptions on a catastrophe’s loss potential. 35 Furthermore, there are risks associated with catastrophe events, which are either poorly represented or not represented at all by catastrophe models.

No longer disclosed

Over the past several years, premium rates have increased for most lines of business, while they have decreased in others, most notably workers' compensation and certain professional liability lines of business.
As described in “International Regulation” above, the EU has recently amended certain provisions in Solvency II, which EU member states will implement in their domestic regulation over the next two years.
Changes in the value of the U.S. dollar relative to other currencies have had and could in the future have an adverse effect on our results of operations and financial condition.
Recently, insurance prices have generally increased for most lines of business, excluding workers' compensation and certain professional liability lines of business.
Our investments in non-U.S.-denominated assets are subject to fluctuations in non-U.S. securities and currency markets, and those markets can be volatile.
Risks Relating to Our Investments A significant amount of our assets is invested in fixed maturity securities and is subject to market fluctuations.
The COVID-19 pandemic, including the related impact on the U.S. and global economies, materially and adversely affected our results of operations.
Depending on conditions in the financial markets and the general economy, we may be unable to raise debt or equity capital if needed.
However, loss costs have also increased and the duration and magnitude of the improved pricing environment remains uncertain.