W R Berkley Corp: 5%+ holders

As of November 10, 2026, 3 holders' latest Schedule 13D or 13G filings report owning 5% or more of W R Berkley Corp. The largest reported stake is W. Robert Berkley, Jr.'s, at 25.67%. 12 filings are on record since December 11, 2025 (Schedule 13D/A, July 21, 2026).

Who owns W R Berkley Corp?

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Key facts

• Filing 2026-10-30 · Reporting person: Vanguard Capital Management · Sole voting: 2,366,289 · Shared voting: 0 · Sole dispositive: 16,502,067 · Shared dispositive: 0 · SCHEDULE 13G/A, 2026-10-30
• Filing 2026-10-27 · Reporting person: BlackRock, Inc. · Sole voting: 15,527,194 · Shared voting: 0 · Sole dispositive: 17,215,830 · Shared dispositive: 0 · SCHEDULE 13G/A, 2026-10-27
• Filing 2026-07-21 · Reporting person: WR Berkley & Others LLC · Sole voting: 63,515,547 · Shared voting: 32,041,777 · Sole dispositive: 63,515,547 · Shared dispositive: 32,041,777 · SCHEDULE 13D/A, 2026-07-21
• Filing 2026-06-04 · Reporting person: Mitsui Sumitomo Insurance Co., Ltd. · Sole voting: 58,780,450 · Shared voting: 0 · Sole dispositive: 58,780,450 · Shared dispositive: 0 · SCHEDULE 13D/A, 2026-06-04
• Filed 2026-04-30 · Holder: Vanguard Capital Management · Percent: 5.8% · SCHEDULE 13G

W R Berkley Corp has 12 Schedule 13D or 13G filings on record since 2025-12-11. 3 holders' latest filing reports 5% or more of common stock. Each figure below is the holder's own, as filed, with the filing linked.

Holders

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More on W R Berkley Corp and the records around it.

W R Berkley Corp elsewhere on the record

• Leadership changes Jun 2026
• Who owns it

Companies that share a holder

• Vanguard Capital Management also filed stake reports on 1495 other companies: A10 Networks Inc (Oct 2026), Altisource Portfolio Solutions SA (Oct 2026), Alto Neuroscience Inc (Oct 2026)
• BlackRock, Inc. also filed stake reports on 1596 other companies: AvePoint, Inc. (Nov 2026), BIOMARIN PHARMACEUTICAL INC (Nov 2026), MSG RANGERS CORP (Nov 2026)
• The Vanguard Group also filed stake reports on 2384 other companies: BellRing Brands, Inc. (Sep 2026), CAL-MAINE FOODS INC (Sep 2026), FTAI Aviation Ltd. (Sep 2026)

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What the Full Report on W R Berkley Corp covers

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4. Who Runs It, And How To Reach Them

5. The Money: Funding, Valuation, Runway

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Voting and dispositive power, as filed

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The latest filing identifies W R Berkley Corp by CUSIP 084423102 and gives its principal executive office as 475 Steamboat Road, Greenwich, CT 06830 (SCHEDULE 13G/A, 2026-10-30).

Source of funds (Item 3)

The shares of Common Stock reported as beneficially owned by the Reporting Persons were acquired in or before the initial public offering of the Issuer, through open market purchases using personal funds, by means of gift, inheritance or other gratuitous transfer, or through their service as an officer, director or employee of the Issuer.W. Robert Berkley, Jr., SCHEDULE 13D/A, 2026-07-21

Purpose of Transaction (Item 4)

Mitsui Sumitomo Insurance Co., Ltd.

Item 4 is hereby amended by replacing the second to last paragraph of Item 4 with the following: In connection with MSI's acquisition of fifteen percent (15%) of the Outstanding Agreement Shares, MSI designated Andrew Carrier, an executive officer of MSI, to serve as a director of the Issuer. Mr. Carrier was nominated to the slate of directors up for election to the Issuer's Board at the Issuer's 2026 annual meeting by the Issuer's Board following the recommendation of the Issuer's Nominating and Corporate Governance Committee to the Board. On June 3, 2026, Mr. Carrier was elected to the Board at the annual meeting of stockholders of the Issuer. Mr. Carrier was designated by MSI pursuant to the terms of the Framework Agreement.Item 4 of the SCHEDULE 13D/A filed 2026-06-04

William R. Berkley

Item 4 is hereby amended by replacing the first paragraph with the following: Calculations of the Reporting Persons' beneficial ownership on the cover pages and in Item 5(a) of this Statement are based on 374,490,856 shares of Common Stock outstanding as of February 23, 2026, as reported in the Issuer's Form 10-K filed with the Securities and Exchange Commission on February 27, 2026. However, when calculating MSI's percentage ownership for certain purposes under the Framework Agreement and LLC Agreement, MSI uses as its denominator 391,869,666 shares of Common Stock, which comprises such number of shares of Common Stock outstanding as of February 23, 2026 and 17,378,810 shares of Common Stock held in a grantor trust as of December 31, 2025, each as reported in the Issuer's Form 10-K filed with the Securities and Exchange Commission on February 27, 2026. We refer to that aggregate number as the "Outstanding Agreement Shares." Item 4 is hereby amended and supplemented by adding the following paragraph as the second to last paragraph of Item 4: In connection with MSI's acquisition of fifteen percent (15%) of the Outstanding Agreement Shares, MSI designated Andrew Carrier, an executive officer of MSI, to serve as a director of the Issuer. Mr. Carrier was nominated to the slate of directors up for election to the Issuer's Board at the Issuer's 2026 annual meeting by the Issuer's Board following the recommendation of the Issuer's Nominating and Corporate Governance Committee to …The first part of Item 4 of the SCHEDULE 13D/A filed 2026-03-05; the filing has the rest

W. Robert Berkley, Jr.

Item 4 is hereby amended by replacing the first paragraph with the following: Calculations of the Reporting Persons' beneficial ownership on the cover pages and in Item 5(a) of this Statement are based on 372,276,732 shares of Common Stock outstanding as of April 27, 2026, as reported in the Issuer's Form 10-Q filed with the Securities and Exchange Commission on May 1, 2026.Item 4 of the SCHEDULE 13D/A filed 2026-07-21

Timeline

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Questions about who owns W R Berkley Corp

Who owns W R Berkley Corp?

On this page, 3 holders' latest ownership filings report 5% or more of W R Berkley Corp: W. Robert Berkley, Jr. (25.67%, Schedule 13D/A, filed 2026-07-21), William R. Berkley (25.51%, Schedule 13D/A, filed 2026-03-05) and Mitsui Sumitomo Insurance Co., Ltd. (15.8%, Schedule 13D/A, filed 2026-06-04).

Who are the largest shareholders of W R Berkley Corp?

By the share each holder's latest filing reports, the largest holders of W R Berkley Corp on this page are W. Robert Berkley, Jr. (25.67%), William R. Berkley (25.51%) and Mitsui Sumitomo Insurance Co., Ltd. (15.8%).

When did W. Robert Berkley, Jr. buy into W R Berkley Corp?

The filings give report dates, not purchase dates. The earliest filing from W. Robert Berkley, Jr. on this page is the Schedule 13D/A, filed 2026-07-21, reporting 25.67%. That earliest filing is itself an amendment, which updates an earlier report.

Is this an audit or a full list?

Neither. The ownership list on this page covers only Schedule 13D and 13G filings, which holders make once they own 5% or more of a class of shares (an amendment can report a stake that has since fallen below 5%); 12 such filings are shown here. It is not an audit and not a full cap table: holders who never reached 5% are not listed, and a stake can change after its latest filing.

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Where this comes from

Anyone who comes to own more than 5% of a class of a listed company's voting shares has to tell the SEC. A holder who may seek to change or influence the company files Schedule 13D, and has to say in Item 4, "Purpose of Transaction", what it intends to do. A holder with no such intent, such as many index and passive funds, may file the shorter Schedule 13G. Both are amended when the stake changes, including when it falls below 5%.

Every row here is one of those filings, linked to the filing itself. Percentages and share counts are exactly as the holder filed them, for the holder the filing names; an amendment showing a lower figure is shown as filed. Item 4 text is quoted word for word. Where a 13D's Item 4 contains a sentence stating a definite intent to influence the company, that sentence is marked and quoted; the page does not describe the holder or its motives beyond the words it filed. Nothing here is investment advice.

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