Mitsui Sumitomo Insurance acquires beneficial ownership of at least 12.5% of WRB

BERKLEY W R CORP

MSI now holds ≥12.5% of WRB outstanding common stock under previously announced Berkley family agreements.
MSI shares will be voted per Berkley family recommendations except for proportional voting in limited cases.
No shares were purchased from the Berkley family or the Company itself.
MSI expects to complete its full investment under the agreements in Q1 2026.
The agreements were originally filed with the SEC on March 28, 2025.

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