Mitsui Sumitomo to buy 15% of W.R. Berkley shares; Berkley family keeps stake

BERKLEY W R CORP

MSI to purchase 15% of WRB common stock via open-market/private transactions from third parties only.
Berkley family (owning ~16%) will not sell any shares; will retain two board seats.
After MSI reaches 4.9% ownership, MSI agrees to vote with Berkley family recommendations.
At 12.5%, Berkley family will nominate an MSI director designee for Board approval.
Investment subject to regulatory approvals; expected to close by end of March 2026.

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