MITSUI SUMITOMO INSURANCE CO LTD 4

What Happened

• Mitsui Sumitomo Insurance Co., Ltd. (MSI) — a 10% owner of W.R. Berkley Corporation (WRB) — purchased a total of 698,000 WRB shares in open-market/private transactions on Jan 22–23, 2026 for aggregate proceeds of about $46.9 million. The purchases were reported under code "P" (purchase) and were effected pursuant to a Rule 10b5-1 purchase plan adopted Oct 3, 2025. MS&AD Insurance Group Holdings, Inc. (MS&AD), MSI’s parent, is also listed on the Form 4 and may be deemed to beneficially own the shares, though MS&AD disclaims beneficial ownership except to the extent of any pecuniary interest.

Key Details

• Transaction dates and weighted-average prices:
  • 2026-01-22: 330,000 shares at $67.45 (weighted avg; prices in this tranche ranged $67.09–$67.66). — $22,258,665
  • 2026-01-23: 201,081 shares at $66.77 (weighted avg; range $66.5195–$66.9993). — $13,426,158
  • 2026-01-23: 166,919 shares at $67.18 (weighted avg; range $67.00–$67.9353). — $11,213,668
• Total acquired: 698,000 shares; total cost ≈ $46,898,491.
• Shares owned after the transactions: not specified in the filing.
• Notable footnotes: purchases were made under a Rule 10b5-1 plan (F1); weighted-average prices reflect multiple executions with per-trade price ranges and the reporting persons will provide per-price details on request (F2, F4, F5); MSI holds the shares directly and MS&AD may be deemed to beneficially own them because MSI is a wholly owned subsidiary (F3).
• Timeliness: Form 4 filed Jan 23, 2026 for transactions on Jan 22–23, 2026 — appears timely (no late filing noted).

Context

• These are institutional purchases by a top-10% owner and its parent, not an executive's personal trade; institutional buys can reflect portfolio or strategic positioning rather than individual insider sentiment.
• The use of a 10b5-1 plan indicates the trades were pre-arranged. The filing is factual and does not state the buyer’s motivation.