W.R. Berkley Corp. is an insurance holding company, which engages in the property casualty insurance business. It operates through the following segments: Insurance and Reinsurance & Monoline Excess. The Insurance segment includes excess and surplus lines, admitted lines, and specialty personal lines throughout the United States, as well as insurance businesses in the United Kingdom, Continental Europe, South America, Canada, Mexico, Scandinavia, Asia, and Australia. The Reinsurance & Monoline Excess segment is involved in the reinsurance business on a facultative and treaty basis, primarily in the United States, United Kingdom, Continental Europe, Australia, the Asia-Pacific region, and South Africa. The company was founded by William R. Berkley in 1967 and is headquartered in Greenwich, CT. |  |
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| Insider Trading |
Relationship |
Date |
Transaction |
Cost |
#Shares |
Value ($) |
#Shares Total |
SEC Form 4 |
| MITSUI SUMITOMO INSURANCE CO L | 10% Owner | Jan 13 '26 | Buy | 68.03 | 325,000 | 22,109,697 | 52,496,504 | Jan 14 09:36 PM | | MITSUI SUMITOMO INSURANCE CO L | 10% Owner | Jan 12 '26 | Buy | 68.73 | 256,041 | 17,598,825 | 52,171,504 | Jan 14 09:36 PM | | MITSUI SUMITOMO INSURANCE CO L | 10% Owner | Jan 14 '26 | Buy | 69.19 | 230,000 | 15,914,286 | 52,726,504 | Jan 14 09:36 PM | | MITSUI SUMITOMO INSURANCE CO L | 10% Owner | Jan 09 '26 | Buy | 68.95 | 275,000 | 18,960,228 | 51,915,463 | Jan 09 08:00 PM | | MITSUI SUMITOMO INSURANCE CO L | 10% Owner | Jan 08 '26 | Buy | 70.16 | 195,000 | 13,680,656 | 51,640,463 | Jan 09 08:00 PM | | MITSUI SUMITOMO INSURANCE CO L | 10% Owner | Jan 07 '26 | Buy | 68.50 | 265,000 | 18,151,585 | 51,445,463 | Jan 07 07:30 PM | | MITSUI SUMITOMO INSURANCE CO L | 10% Owner | Jan 06 '26 | Buy | 70.05 | 215,288 | 15,080,818 | 51,180,463 | Jan 07 07:30 PM | | MITSUI SUMITOMO INSURANCE CO L | 10% Owner | Jan 05 '26 | Buy | 70.59 | 200,930 | 14,183,845 | 50,965,175 | Jan 07 07:30 PM | | MITSUI SUMITOMO INSURANCE CO L | 10% Owner | Jan 02 '26 | Buy | 69.35 | 237,734 | 16,486,306 | 50,764,245 | Jan 02 07:00 PM | | MITSUI SUMITOMO INSURANCE CO L | 10% Owner | Dec 31 '25 | Buy | 70.27 | 230,000 | 16,160,996 | 50,526,511 | Jan 02 07:00 PM | | MITSUI SUMITOMO INSURANCE CO L | 10% Owner | Dec 30 '25 | Buy | 70.83 | 205,000 | 14,519,822 | 50,296,511 | Jan 02 07:00 PM | | MITSUI SUMITOMO INSURANCE CO L | 10% Owner | Dec 23 '25 | Buy | 70.32 | 234,573 | 16,494,677 | 49,446,511 | Dec 29 07:00 PM | | MITSUI SUMITOMO INSURANCE CO L | 10% Owner | Dec 26 '25 | Buy | 70.56 | 220,000 | 15,522,760 | 49,886,511 | Dec 29 07:00 PM | | MITSUI SUMITOMO INSURANCE CO L | 10% Owner | Dec 24 '25 | Buy | 70.51 | 220,000 | 15,512,046 | 49,666,511 | Dec 29 07:00 PM | | MITSUI SUMITOMO INSURANCE CO L | 10% Owner | Dec 29 '25 | Buy | 70.77 | 205,000 | 14,508,383 | 50,091,511 | Dec 29 07:00 PM | | MITSUI SUMITOMO INSURANCE CO L | 10% Owner | Dec 22 '25 | Buy | 70.26 | 202,000 | 14,191,649 | 49,211,938 | Dec 22 08:45 PM | | MITSUI SUMITOMO INSURANCE CO L | 10% Owner | Dec 19 '25 | Buy | 69.50 | 204,000 | 14,178,612 | 49,009,938 | Dec 22 08:45 PM | | MITSUI SUMITOMO INSURANCE CO L | 10% Owner | Dec 18 '25 | Buy | 69.38 | 204,350 | 14,178,110 | 48,805,938 | Dec 22 08:45 PM | | Mark Shapiro | Former Board Member | Jul 28 '25 | Proposed Sale | 68.82 | 53,375 | 3,673,268 | | Jul 28 04:26 PM |
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