Neuberger Berman Group LLC has announced its beneficial ownership of 5.2% of White Mountains Insurance Group Ltd. This significant stake reflects the company's strategic investment approach and growing influence within the fire, marine, and casualty insurance sector.

According to the recent filing made on November 13, 2026, Neuberger Berman Group LLC reported that it holds 124,677 shares of White Mountains Insurance Group. The filing indicates that Neuberger Berman has shared voting power over 117,386 of these shares, as well as shared dispositive power over the total number of shares held.

Background

Neuberger Berman Group LLC, incorporated in Delaware, is a prominent investment management firm. The company focuses on providing investment management and advisory services to a diverse range of clients, including institutions and individuals. The recent filing is part of a series of disclosures, including multiple Schedule 13G filings, which indicate the firm's ongoing engagement with various securities.

What the Filing Says

The filing states, "Neuberger Berman Group LLC and its affiliates may be deemed to be beneficial owners of securities for purposes of Exchange Act Rule 13d-3 because they or certain affiliated persons have shared power to retain, dispose of or vote the securities of unrelated clients." This emphasizes the firm's fiduciary responsibilities and its role in managing assets on behalf of clients.

Impact

This ownership stake may influence the strategic direction of White Mountains Insurance Group, especially in areas related to governance and shareholder engagement. The filing also highlights the interconnectedness of Neuberger Berman's various subsidiaries, which include Neuberger Berman Investment Advisers LLC, indicating a robust investment management structure.

What's Next

The filing does not say what happens next.