Neuberger Berman Group LLC and Neuberger Berman Investment Advisers LLC filed a Schedule 13G on November 13, 2026, disclosing beneficial ownership positions in White Mountains Insurance Group Ltd as of September 30, 2026.

Key Highlights

  • Aggregate beneficial ownership: Neuberger Berman Group LLC reported beneficial ownership of 124,677 shares of White Mountains Insurance Group Ltd common stock, representing 5.2% of the class.
  • Neuberger Berman Investment Advisers LLC position: The investment adviser subsidiary reported beneficial ownership of 121,418 shares, representing 5.1% of the class.
  • Voting power: Neuberger Berman Group LLC reported shared voting power over 117,386 shares and sole voting power of 0 shares.
  • Dispositive power: Neuberger Berman Group LLC reported shared dispositive power over 124,677 shares and sole dispositive power of 0 shares.
  • Event date: The date of event requiring this filing was September 30, 2026.
  • Beneficial ownership disclaimed: According to the filing, each of the named entities "disclaim beneficial ownership of the securities covered by this statement pursuant to Exchange Act Rule 13d-4."

Neuberger Berman's Schedule 13G Position in White Mountains Insurance as of September 30, 2026

According to the filing, Neuberger Berman Group LLC, a Delaware-organized holding company located at 1290 Avenue of the Americas, New York, NY 10104, disclosed an aggregate beneficial ownership of 124,677 shares of White Mountains Insurance Group Ltd common stock (CUSIP G9618E107), representing 5.2% of the class. The filing identifies Neuberger Berman Group LLC as a parent holding company (type "HC") and Neuberger Berman Investment Advisers LLC as an investment adviser (type "IA").

The filing states that Neuberger Berman Group LLC controls Neuberger Berman Investment Advisers LLC through its subsidiaries Neuberger Berman Investment Advisers Holdings LLC and Neuberger Trust Holdings LLC, as well as other affiliated entities including Neuberger Berman Trust Co N.A., Neuberger Berman Trust Co of Delaware N.A., Neuberger Berman Asia Ltd., and Neuberger Berman Canada ULC. The filing notes that the holdings of these entities are aggregated to comprise the positions reported. The filing also states that securities potentially beneficially owned by NB Alternatives Advisers LLC and other subsidiaries separated from the reporting filers by an information barrier are not reflected in this filing.

The filing further states that Neuberger Berman Group LLC and its affiliates "do not, however, have any economic interest in the securities of those clients," and that "the clients have the sole right to receive and the power to direct the receipt of dividends from or proceeds from the sale of such securities." The certifying signatory, Brad Cetron, Managing Director, certified that the securities "were acquired and are held in the ordinary course of business and were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer."

What Was Disclosed

Neuberger Berman Group LLC and Neuberger Berman Investment Advisers LLC filed a Schedule 13G disclosing aggregate beneficial ownership of 124,677 shares, or 5.2%, of White Mountains Insurance Group Ltd common stock as of September 30, 2026, with all dispositive and voting power held on a shared basis.