Symbols

WTM

White Mountains Insurance Group·NYSE

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WTM Profile

White Mountains Insurance Group, Ltd.

A financial services holding company that offers property and casualty insurance and liability, property, accident and other reinsurance products

Industry

Insurance

Established Date

Listing Date

10/25/1985

Exchange

New York Stock Exchange

Full-time Employees

1,648

Fiscal Year Ends

12-31

Website

www.whitemountains.com

Security Type

Common stock

Office address

23 South Main Street, Suite 3B, Hanover, New Hampshire 03755-2053

Business

Introduction

White Mountains Insurance Group Limited is a Bermuda exempted limited liability company engaged in opportunistic and value-oriented acquisitions in the insurance and financial services sectors. The company operates through its subsidiaries and affiliates and is headquartered in Hamilton, Bermuda, with an administrative office in Hanover, New Hampshire. As of December 31, 2025, the company operates in five main areas: property and casualty insurance and reinsurance, municipal bond guarantee reinsurance, capital solutions for asset and wealth management companies, specialty insurance distribution, and other businesses.