Mitsui Sumitomo Insurance Co., Ltd. (MSI) has increased its stake in W. R. Berkley Corporation to 27.5% of the insurer’s outstanding common stock. The increase comes after MSI acquired an additional 12.5% stake in December 2025, building on a 15% holding it purchased in March 2025.
The transaction is structured so that MSI’s shares will be voted in accordance with the Berkley family’s recommendations, except in limited circumstances where MSI will vote proportionally with other non‑MSI shareholders. The agreement also provides that the Berkley family will recommend a director designee from MSI to the board, subject to committee approval. The full completion of the investment is expected in the first quarter of 2026, although the beneficial ownership was announced on December 5, 2025.
MSI’s move is part of its broader strategy to deepen its presence in the U.S. specialty‑insurance market. By securing a sizable stake in a well‑capitalized, S&P 500‑listed insurer, MSI gains a foothold in a market segment that complements its existing cyber‑insurance and global underwriting capabilities.
W. R. Berkley reported a 40% year‑over‑year rise in net income to $511 million in its most recent quarter, with a combined ratio of 90.9%. The additional capital from MSI is expected to strengthen the company’s balance sheet and support future growth initiatives, while the voting arrangement preserves the current ownership structure and control.
The partnership is anticipated to provide W. R. Berkley with a stable, long‑term shareholder that can support capital needs and strategic initiatives. MSI’s participation does not alter day‑to‑day operations, but the board seat and voting alignment may influence governance decisions over the long term.
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