Form 4: 10% Owner Boosts Stake in W.R. Berkley

Mitsui Sumitomo Insurance Co. Ltd., a 10% owner and director, increased its beneficial ownership in W.R. Berkley Corp. by purchasing 97,996 shares of common stock.

Summary

• Mitsui Sumitomo Insurance Co. Ltd. and its parent, MS&AD Insurance Group Holdings, Inc., reported multiple purchases of W.R. Berkley Corp. common stock.
• A total of 97,996 shares were acquired across several transactions between February 9, 2026, and February 11, 2026.
• The purchases were executed under a Rule 10b5-1 purchase plan adopted on October 3, 2025.
• Following these transactions, the reporting persons beneficially own 56,556,652 shares of W.R. Berkley Corp. common stock.
• The shares are held directly by Mitsui Sumitomo Insurance Co., Ltd., with MS&AD Insurance Group Holdings, Inc. potentially deemed to beneficially own them due to its wholly-owned subsidiary relationship, though MS&AD disclaims beneficial ownership except for its pecuniary interest.
• Weighted average prices for the purchases ranged from approximately $69.0872 to $71.4493 per share.

Sentiment

Score: 8

Explanation: StockSavvy.ai views this as a strong positive signal, as a significant institutional shareholder and director is increasing its stake, indicating confidence in the company's value and future performance.

Positives

• A significant 10% owner and director, Mitsui Sumitomo Insurance Co. Ltd., increased its stake in W.R. Berkley Corp. by purchasing 97,996 shares.
• The purchases were made through a pre-arranged Rule 10b5-1 plan, indicating a planned investment strategy.
• Increased insider ownership can signal confidence in the company's future prospects.

Risks

• The reporting persons disclaim beneficial ownership of the securities of the Issuer owned by WR Berkley & Others LLC (WRBO).
• The reporting persons disclaim that they and WRBO constitute a 'group' within the meaning of Rule 13d-5(b)(1) under the Securities Exchange Act of 1934, as amended.

Future Outlook

The filing does not contain explicit forward-looking statements or guidance regarding W.R. Berkley Corp.'s future performance. The purchases under a 10b5-1 plan suggest a pre-determined investment strategy by the reporting persons.

Management Comments

• The purchases reported on this Form 4 were effected pursuant to a Rule 10b5-1 purchase plan, adopted October 3, 2025.
• The Reporting Persons undertake to provide to W.R. Berkley Corporation (the 'Issuer'), any security holder of the Issuer, or the staff of the U.S. Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the ranges set forth in this footnote and in footnotes 4, 5, 6, 7, 8 and 9.
• MS&AD expressly disclaims beneficial ownership of the reported securities, except to the extent of its pecuniary interest therein.
• The Reporting Persons disclaim beneficial ownership of the securities of the Issuer owned by WRBO and disclaim that the Reporting Persons and WRBO constitute a 'group' within the meaning of Rule 13d-5(b)(1) under the Securities Exchange Act of 1934, as amended.

Industry Context

StockSavvy.ai notes that insider buying, especially from a significant institutional investor like Mitsui Sumitomo Insurance, can be interpreted as a positive signal within the insurance and financial services industry, suggesting confidence in W.R. Berkley's valuation or future prospects amidst broader market conditions.

Comparison to Industry Standards

• While specific comparable companies or projects are not detailed in this Form 4, the acquisition of additional shares by a major institutional investor and 10% owner like Mitsui Sumitomo Insurance is generally viewed favorably, aligning with a strategy of increasing exposure to a company believed to be undervalued or poised for growth, a common practice among large institutional players in the global insurance sector.

Related Party Transactions

• Mitsui Sumitomo Insurance Co., Ltd. (MSI), W.R. Berkley Corp. (the Issuer), and WR Berkley & Others LLC (WRBO) are party to certain agreements described in, and filed as exhibits to, the Reporting Persons' Schedule 13D filed with the U.S. Securities and Exchange Commission on December 11, 2025.

Stakeholder Impact

• Shareholders: Existing shareholders may view the increased insider ownership as a positive indicator of future stock performance and management confidence.
• Investors: Potential investors might see this as a favorable signal, potentially increasing interest in W.R. Berkley Corp. stock.

Next Steps

• The reporting persons undertake to provide full information regarding share purchases at specific prices upon request.
• Continued monitoring of W.R. Berkley Corp.'s performance and future filings for further insights into the reporting persons' investment strategy.

Key Dates

Recommendation

The significant increase in beneficial ownership by a major institutional shareholder and director, Mitsui Sumitomo Insurance Co. Ltd., signals strong insider confidence in W.R. Berkley Corp.'s valuation and future prospects. This strategic buying, executed under a 10b5-1 plan, suggests a deliberate long-term positive outlook, making it a compelling 'buy' signal for seasoned investors.

Keywords

W.R. Berkley Corp, WRB, Mitsui Sumitomo Insurance, MS&AD Insurance Group Holdings, Form 4, insider buying, stock purchase, beneficial ownership, 10b5-1 plan, insurance, financial services