MITSUI SUMITOMO INSURANCE CO LTD 4

What Happened Mitsui Sumitomo Insurance Co., Ltd. (a reported 10% owner of W.R. Berkley Corp., WRB) purchased a total of 300,000 WRB shares in open-market transactions across Feb 26–27, 2026. Transactions: 145,491 shares at $71.65 ($10,423,848); 7,509 shares at $72.11 ($541,504); and 147,000 shares at $71.63 ($10,528,963). Total reported purchase value is approximately $21.49 million. These were purchases (buying stock), which are generally considered a bullish capital allocation rather than disposals.

Key Details

• Transaction dates: Feb 26, 2026 (two tranches) and Feb 27, 2026 (one tranche). Filing date: Feb 27, 2026 (timely).
• Prices and values: 145,491 @ $71.65 = $10,423,848; 7,509 @ $72.11 = $541,504; 147,000 @ $71.63 = $10,528,963. Aggregate ~300,000 shares for ~$21.49M.
• Shares owned after transaction: Not specified in the Form 4 provided.
• Notable footnotes: Purchases were made under a Rule 10b5‑1 purchase plan adopted Oct 3, 2025 (F1). Reported prices are weighted averages from multiple executions with disclosed price ranges (F2, F4, F5). Shares held directly by MSI; MS&AD (parent) may be deemed to beneficially own but disclaims ownership except for pecuniary interest (F3). Filing also references agreements with WR Berkley & Others LLC and a Schedule 13D (remarks).
• Transaction code: P = Purchase.

Context This filing reports institutional purchases by a major insurance company (a 10% owner), not an individual executive. Institutional buys of this size (~$21.5M) can reflect portfolio or strategic positioning but do not, by themselves, identify management sentiment. The use of a 10b5‑1 plan indicates the purchases were executed under a pre‑arranged plan adopted Oct 3, 2025.