White Mountains Insurance Group, Ltd. (WTM:NYSE) closed at $2,225.24 on October 23, 2026, down 0.99% on the day. The stock trades 4.6% below its 52-week high of $2,333.00 and 19.4% above its 52-week low of $1,863.60. Over the past year, it gained 16.1%. White Mountains Insurance Group, Ltd. is part of the Finance sector (Property-Casualty Insurers).
In 252 trading sessions since October 23, 2025, WTM closed higher on 124 days (49%). Its best day was November 21, 2025 (+6.29%) and its worst was February 9, 2026 (-3.95%). It never moved 10% or more in a single session.
White Mountains Insurance Group, Ltd., through its subsidiaries, engages in engages in insurance, reinsurance, and insurance services businesses in the United States. The company operates through OneBeacon and HG Global/BAM segments. The OneBeacon segment underwrites professional liability and other specialized coverages for the healthcare industry, such as excess insurance, and excess of loss or HMO reinsurance; multi-line package and tuition reimbursement insurance; commercial surety bonds; and professional liability coverages for architects and engineers, and various customer groups. It also offers management liability insurance to private for-profit and nonprofit organizations; products for financial services and financial institutions industry; specialty property insurance, such as excess property and inland marine solutions; all-lines underwriting solutions for the technology and telecommunications industries; and environmental risk, ocean marine, specialized accident, entertainment, and government risks solutions. This segment provides its products through independent agencies, regional and national brokers, wholesalers, and managing general agencies. The HG Global/BAM segme...
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