MITSUI SUMITOMO INSURANCE CO LTD 4

What Happened
Mitsui Sumitomo Insurance Co., Ltd. (a reported 10% owner of W. R. Berkley Corp.) made open-market purchases of WR Berkley (WRB) stock on Feb 5–6, 2026, acquiring a total of 40,000 shares for approximately $2,835,252. The purchases were reported as: 6,528 shares @ $70.79 ($462,110) and 13,472 shares @ $71.25 ($959,918) on Feb 5, and 15,694 shares @ $70.46 ($1,105,812) and 4,306 shares @ $71.39 ($307,412) on Feb 6. These were buy transactions (acquisitions), executed pursuant to a pre-established Rule 10b5-1 plan.

Key Details

• Transaction dates: Feb 5–6, 2026 (Form filed Feb 6, 2026). Filing appears timely (Form 4 filed within the required reporting window).
• Lots and amounts:
  • Feb 5: 6,528 sh @ $70.79 = $462,110 (P)
  • Feb 5: 13,472 sh @ $71.25 = $959,918 (P)
  • Feb 6: 15,694 sh @ $70.46 = $1,105,812 (P)
  • Feb 6: 4,306 sh @ $71.39 = $307,412 (P)
• Total: 40,000 shares purchased for ~$2.84 million.
• Shares are held directly by Mitsui Sumitomo Insurance Co., Ltd. (MSI). MSI is a wholly‑owned subsidiary of MS&AD Insurance Group Holdings, Inc.; MS&AD may be deemed to beneficially own the securities but expressly disclaims beneficial ownership except for any pecuniary interest (see footnote).
• Footnotes: Purchases were made under a Rule 10b5-1 plan adopted Oct 3, 2025 (F1). Reported prices are weighted averages covering multiple trade prices within specified ranges (F2–F6); the filing offers to provide a per-price breakdown on request.
• Shares owned following the transactions are not specified in the provided summary.

Context

• These purchases were by an institutional 10% owner via a Rule 10b5-1 trading plan, which typically reflects scheduled, pre-arranged trades rather than ad-hoc insider timing—important for interpreting intent.
• Because this is an institutional holder (not a company executive), the trade is not an executive signal but does increase the institution’s stake in WRB.