White Mountains Insurance Group Q3 2026 Earnings Date & Estimates

White Mountains Insurance Group (NYSE:WTM) is a Bermuda-based holding company that owns and manages businesses in the insurance and related financial services industries. Rather than operating as a traditional single-line insurer, the company invests in a portfolio of specialty insurance, reinsurance, and financial services businesses.

White Mountains’ operations and investments have included property and casualty insurance and reinsurance businesses, specialty insurance providers, and businesses serving the municipal bond market. Its portfolio has included HG Global and Build America Mutual, which provide insurance for municipal bonds, as well as Kudu Investment Management, an investment platform that provides capital and strategic support to asset-management firms. The company also has interests in other specialty insurance and financial services businesses.

White Mountains has a history dating to its establishment in 1980 and has expanded through acquisitions, partnerships, and investments in specialized financial services companies. The group serves customers primarily in the United States and other international markets through its operating subsidiaries and affiliates. Michael S. Brown serves as the company’s chief executive officer.