Jul 21, 2026
13D/A
25.7%
of WRB's shares
▲ up from 25.5% on Mar 5, 2026
WR Berkley & Others LLC
and 7 more reporting persons
· 95.56M shares
· event Jul 17, 2026
Item 4, purpose of the transaction: 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.
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Jun 4, 2026
13D/A
15.8%
of WRB's shares
▲ up from 15.7% on Mar 5, 2026
Mitsui Sumitomo Insurance Co., Ltd.
and 1 more reporting person
· 58.78M shares
· event Jun 3, 2026
Item 4, purpose of the transaction: 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 …
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Mar 5, 2026
13D/A
25.5%
of WRB's shares
▲ up from 25.1% on Dec 11, 2025
WR Berkley & Others LLC
and 7 more reporting persons
· 95.55M shares
· event Mar 4, 2026
Item 4, purpose of the transaction: 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 Sto…
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Mar 5, 2026
13D/A
15.7%
of WRB's shares
▲ up from 14.9% on Feb 6, 2026
Mitsui Sumitomo Insurance Co., Ltd.
and 1 more reporting person
· 58.78M shares
· event Mar 4, 2026
Item 4, purpose of the transaction: 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, LLC Agreement and 10b5-1 Purchase Plan (each as defined below), MSI uses as its denominator 391,869,666 shares of Common Stock, which comprises such number of shares of Common Stock outstanding as of Februa…
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Feb 6, 2026
13D/A
14.9%
of WRB's shares
▲ up from 13.9% on Jan 14, 2026
Mitsui Sumitomo Insurance Co., Ltd.
and 1 more reporting person
· 56.46M shares
· event Feb 5, 2026
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Jan 14, 2026
13D/A
13.9%
of WRB's shares
▲ up from 12.8% on Dec 11, 2025
Mitsui Sumitomo Insurance Co., Ltd.
and 1 more reporting person
· 52.73M shares
· event Jan 13, 2026
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Dec 11, 2025
13D
25.1%
of WRB's shares
new stake, above 5%
WR Berkley & Others LLC
and 7 more reporting persons
· 95.55M shares
· event Dec 5, 2025
Item 4, purpose of the transaction: Calculations of the Reporting Persons' beneficial ownership on the cover pages and in Item 5(a) of this Statement are based on 380,021,174 shares of Common Stock outstanding as of October 28, 2025, as reported in the Issuer's Form 10-Q filed with the Securities and Exchange Commission on November 3, 2025. However, when calculating MSI's percentage ownership for certain purposes under the Framework Agreement, LLC Agreement (each as defined below), MSI uses as its denominator 397,680,471 shares of Common Stock, which comprises such number of shares of Common Stock outstanding as of October 28, 2025 and 17,659,297 shares of Common Stock held in a grantor trust as of September 30, 2025, each as …
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Dec 11, 2025
13D
12.8%
of WRB's shares
new stake, above 5%
Mitsui Sumitomo Insurance Co., Ltd.
and 1 more reporting person
· 48.60M shares
· event Dec 4, 2025
Item 4, purpose of the transaction: Calculations of the Reporting Persons' beneficial ownership on the cover pages and in Item 5(a) of this Statement are based on 380,021,174 shares of Common Stock outstanding as of October 28, 2025, as reported in the Issuer's Form 10-Q filed with the Securities and Exchange Commission on November 3, 2025. However, when calculating MSI's percentage ownership for certain purposes under the Framework Agreement, LLC Agreement and 10b5-1 Purchase Plan (each as defined below), MSI uses as its denominator 397,680,471 shares of Common Stock, which comprises such number of shares of Common Stock outstanding as of October 28, 2025 and 17,659,297 shares of Common Stock held in a grantor trust as of Se…
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