White Mountains Insurance Group, Ltd. (WTM)
NYSE: WTM · Real-Time Price · USD
2,034.79
-3.00 (-0.15%)
Dec 5, 2025, 4:00 PM EST - Market closed

Company Description

White Mountains Insurance Group, Ltd., through its subsidiaries, engages in the provision of insurance and other financial services in the United States.

It operates through four segments: Ark/WM Outrigger, HG Global, Kudu, and Bamboo. The Ark/WM Outrigger segment offers insurance and reinsurance products, including property, specialty, marine and energy, casualty, and accident and health.

The HG Global segment provides reinsurance to BAM, focusing on single risk limits for small-to-medium sized, and public investment grade municipal bonds that are issued to finance public purpose projects, including schools, utilities, and transportation facilities.

The Kudu segment offers capital solutions for boutique asset and wealth managers for various purposes comprising generational ownership transfers, management buyouts, acquisition and growth finance, and legacy partner liquidity, as well as strategic assistance to investees.

The Bamboo segment is involved in the operation of a capital-light, tech- and data-enabled insurance distribution platform, which provides homeowners’ insurance and related products to the residential property market.

White Mountains Insurance Group, Ltd. was incorporated in 1980 and is headquartered in Hamilton, Bermuda.

White Mountains Insurance Group, Ltd.
White Mountains Insurance Group logo
Country Bermuda
Founded 1980
Industry Insurance - Property & Casualty
Sector Financials
Employees 893
CEO George Rountree

Contact Details

Address:
A.S. Cooper Building, Suite 601
Hamilton, HM 11
Bermuda
Phone 441 278 3160
Website whitemountains.com

Stock Details

Ticker Symbol WTM
Exchange NYSE
Fiscal Year January - December
Reporting Currency USD
CIK Code 0000776867
CUSIP Number G9618E107
ISIN Number BMG9618E1075
Employer ID 94-2708455
SIC Code 6331

Key Executives

Name Position
George Manning Rountree Chief Executive Officer and Director
Liam P. Caffrey President and Chief Financial Officer
Michaela J. Hildreth MD and Chief Accounting Officer
Robert Lawrence Seelig Esq. Executive Vice President, General Counsel and Investor Relation
Giles Edward Harrison Executive Vice President and Chief Strategy Officer
Jonathan Adam Cramer Chief Investment Officer
Jennifer L. Moyer Chief Administrative Officer and Corporate Secretary
David Grant Staples Head of Tax
Michael Papamichael MD and Deputy Chief Financial Officer
Dennis Beaulieu Treasurer

Latest SEC Filings

Date Type Title
Nov 21, 2025 SC TO-I Filing
Nov 13, 2025 13F-HR Quarterly report filed by institutional managers, holdings
Nov 7, 2025 SCHEDULE 13G/A Filing
Nov 6, 2025 10-Q Quarterly Report
Nov 6, 2025 8-K Current Report
Oct 3, 2025 8-K Current Report
Sep 3, 2025 8-K Current Report
Sep 2, 2025 8-K Current Report
Aug 27, 2025 N-PX Annual Report of proxy voting record of management investment companies
Aug 11, 2025 13F-HR Quarterly report filed by institutional managers, holdings