W. R. Berkley Corporation (WRB)10% owner bought ~$14.2M

~$14.2M

Approx. value · 204K sh @ $69.50

49M

Holds after · shares reported

Traded

Dec 19, 2025

Filed

Dec 23, 2025

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. Oct 20, 2025Company filing · Form 8-K · ResultsReported its results
2. Oct 30, 2025Congress · 1 personMembers of Congress: 1 purchase, 1 sale
3. Oct 31, 2025CongressDisclosed sale of WRB — reported range $1,001 - $15,000
4. Dec 11, 20255% stakeMitsui Sumitomo Insurance Co., Ltd. filed an activist stake (13D) of 12.8%
5. Dec 11, 20255% stakeWR Berkley & Others LLC filed an activist stake (13D) of 25.1%
6. Dec 18, 2025Insider · First insider buy since Aug 202210% owner purchased ~$14.2M of WRB shares in the open market
7. Dec 19, 2025 · this disclosureInsider10% owner purchased ~$14.2M of WRB shares in the open market

What came next

1. Dec 22, 2025Insider · 1 personInsiders: 2 purchases (~$14.2M)
2. Dec 23, 2025Insider · 1 personInsiders: 2 purchases (~$16.5M)
3. Dec 24, 2025Insider10% owner purchased ~$15.5M of WRB shares in the open market
4. Dec 26, 2025Insider10% owner purchased ~$15.5M of WRB shares in the open market
5. Dec 29, 2025Insider10% owner purchased ~$14.5M of WRB shares in the open market
6. Dec 30, 2025Insider10% owner purchased ~$14.5M of WRB shares in the open market
7. Dec 31, 2025Insider10% owner purchased ~$16.2M of WRB shares in the open market
8. Jan 2, 2026Insider10% owner purchased ~$16.5M of WRB shares in the open market
9. Jan 5, 2026Insider · 1 personInsiders: 3 purchases (~$14.2M)
10. Jan 6, 2026Insider · 1 personInsiders: 2 purchases (~$15.1M)
11. Jan 6, 2026CongressDisclosed partial sale of WRB — reported range $1,001 - $15,000
12. Jan 7, 2026Insider · 1 personInsiders: 2 purchases (~$18.2M)
13. Jan 8, 2026Insider · 1 personInsiders: 3 purchases (~$13.7M)
14. Jan 9, 2026Insider · 1 personInsiders: 3 purchases (~$19.0M)
15. Jan 12, 2026Insider · 14 days before results10% owner purchased ~$17.6M of WRB shares in the open market
16. Jan 13, 2026Insider · 1 personInsiders: 2 purchases (~$22.1M)
17. Jan 14, 20265% stakeMitsui Sumitomo Insurance Co., Ltd. filed an activist stake (13D) of 13.9%
18. Jan 14, 2026Insider · 1 personInsiders: 2 purchases (~$15.9M)
19. Jan 15, 2026Insider · 1 personInsiders: 2 purchases (~$16.2M)
20. Jan 16, 2026Insider · 1 personInsiders: 2 purchases (~$20.5M)

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

• SEC Form 4 at W. R. Berkley Corporation (WRB)Mar 4, 2026
• SEC Form 4 at W. R. Berkley Corporation (WRB)Mar 4, 2026
• SEC Form 4 at W. R. Berkley Corporation (WRB)Mar 4, 2026
• SEC Form 4 at W. R. Berkley Corporation (WRB)Mar 4, 2026
• SEC Form 4 at W. R. Berkley Corporation (WRB)Feb 28, 2026

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

How this filing works

• SEC Form 4
• Open-market purchase
• Rule 10b5-1 trading plans

Other disclosures at W. R. Berkley Corporation

• SEC Form 13F-HRAug 14, 2026
• SEC Form 13F-HRAug 14, 2026
• SEC Form 13F-HRAug 14, 2026
• SEC Form 13F-HRAug 13, 2026
• SEC Form 13F-HRAug 10, 2026
• SEC Form 13F-HRJul 29, 2026

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