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W. R. Berkley Corporation (WRB)10% owner bought ~$5.31M

MITSUI SUMITOMO INSURANCE CO LTD, 10% owner at W. R. Berkley Corporation, bought ~$5.31M of W. R. Berkley Corporation shares.

~$5.31M
Approx. value · 73K sh @ $72.52
58.8M
Holds after · shares reported
Traded
Mar 3, 2026
Filed
Mar 4, 2026

The story around this disclosure

Every dated public record OQRO holds about the company from 60 days before to 120 days after, oldest first. It shows what was going on; none of it is a stated reason for the trade.

  1. Jan 23, 2026Insider · 1 personInsiders: 2 purchases (~$24.6M)
  2. Jan 26, 2026Company filing · Form 8-K · ResultsReported its results
  3. Jan 26, 2026Insider · 1 personInsiders: 2 purchases (~$24.8M)
  4. Jan 27, 2026Insider · 1 personInsiders: 5 purchases (~$23.6M)
  5. Jan 28, 2026Insider · 1 personInsiders: 2 purchases (~$20.9M)
  6. Jan 29, 2026Insider · 1 personInsiders: 2 purchases (~$19.8M)
  7. Jan 30, 2026Insider10% owner purchased ~$13.3M of WRB shares in the open market
  8. Feb 2, 2026Insider · 1 personInsiders: 2 purchases (~$17.0M)
  9. Feb 3, 2026Insider · 1 personInsiders: 2 purchases (~$2.7M)
  10. Feb 4, 2026Insider · 1 personInsiders: 2 purchases (~$1.8M)
  11. Feb 5, 2026Insider · 1 personInsiders: 2 purchases (~$1.4M)
  12. Feb 6, 20265% stakeMitsui Sumitomo Insurance Co., Ltd. filed an activist stake (13D) of 14.9%
  13. Feb 6, 2026Insider · 1 personInsiders: 2 purchases (~$1.4M)
  14. Feb 9, 2026Insider · 1 personInsiders: 2 purchases (~$2.8M)
  15. Feb 10, 2026Insider · 1 personInsiders: 2 purchases (~$2.4M)
  16. Feb 11, 2026Insider · 1 personInsiders: 3 purchases (~$1.7M)
  17. Feb 12, 2026Insider · 1 personInsiders: 2 purchases (~$1.4M)
  18. Feb 13, 2026Insider · 1 personInsiders: 3 purchases (~$1.4M)
  19. Feb 17, 2026Insider10% owner purchased ~$20M of WRB shares in the open market
  20. Feb 18, 2026Insider · 1 personInsiders: 2 purchases (~$20.1M)
  21. Feb 19, 2026Insider · 1 personInsiders: 2 purchases (~$24.4M)
  22. Feb 20, 2026Insider10% owner purchased ~$11.4M of WRB shares in the open market
  23. Feb 23, 2026Insider · 1 personInsiders: 2 purchases (~$15.7M)
  24. Feb 24, 2026Insider · 1 personInsiders: 2 purchases (~$11.7M)
  25. Feb 25, 2026Insider · 1 personInsiders: 2 purchases (~$12.1M)

What came next

  1. Mar 5, 20265% stakeMitsui Sumitomo Insurance Co., Ltd. filed an activist stake (13D) of 15.7%
  2. Mar 5, 20265% stakeWR Berkley & Others LLC filed an activist stake (13D) of 25.5%
  3. Mar 27, 20265% stakeThe Vanguard Group reported a passive stake (13G)
  4. Apr 21, 2026Company filing · Form 8-K · ResultsReported its results
  5. Apr 30, 20265% stakeVanguard Capital Management reported a passive stake (13G) of 5.8%
  6. Jun 4, 20265% stakeMitsui Sumitomo Insurance Co., Ltd. filed an activist stake (13D) of 15.8%
  7. Jun 9, 2026Company filing · Form 8-K · Material agreement, New debtSigned an important agreement, and took on new debt or obligations
  8. Jun 26, 2026Company filing · Form 8-K · Executive changeChanged a top executive or board member“Lucille Sgaglione has informed W. R. Berkley Corporation (the “Company”) that she will resign from her position as Executive Vice President of the Company, effective June 30, 2026.”
View the official recordSEC Form 4

How to read SEC Form 4

Form 4 is the filing that officers, directors and owners of more than 10% of a US-listed company must send to the SEC within two business days after they buy, sell or otherwise change their holding of the company's stock.

Full guide: What is an SEC Form 4?

What else is on file for W. R. Berkley Corporation

For W. R. Berkley Corporation, OQRO holds 7 fund holdings reports (13F) dated in the last 90 days.

These are records OQRO holds, counted by their date, not a measure of how much trading took place. Routine paperwork such as option exercises and tax withholding is left out. Everything for the company is on its WRB page.

Other recent filings by MITSUI SUMITOMO INSURANCE CO LTD, 10% owner

The full history of MITSUI SUMITOMO INSURANCE CO LTD, 10% owner is on the profile page.

How this filing works

Other disclosures at W. R. Berkley Corporation

Everything OQRO holds on this company is on its WRB page.

This is one filing. OQRO holds the rest

Insider trades filed with the SEC, stock trades disclosed by members of Congress, fund holdings from 13F filings and federal contract awards, each one in plain words next to its official filing. On this page it opens why the trade stands out, what the company did around that time, the price since, and every field of the form.

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