White Mountains Insurance Group Ltd. logo

White Mountains Insurance Group Ltd.

WTM | NYSE
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$2,056.85
-$4.45 (-0.22%)
At close: Sep 21, 2026, 4:00 PM ET
$2,056.85
$0 (0.00%)
After-hours: Sep 21, 2026, 6:22 PM ET

Company Profile

White Mountains Insurance Group, Ltd. provides insurance services in the United States, the United Kingdom, Bermuda, and internationally. It operates through Ark/WM Outrigger, HG Global, Kudu, Distinguished, and Other Operations segments. The company offers property insurance and reinsurance; specialty insurance and reinsurance consisting of aviation, contingency, cyber, fine art and specie, mortgage, nuclear, political and credit, space, surety, and terrorism and political violence; marine and energy insurance and reinsurance; casualty insurance and reinsurance, such as medical malpractice, and professional and general liability; and accident and health insurance and reinsurance, which includes personal accident, sickness, disability, travel, short-term life, and medical products through brokers, managing general agents (MGA), and reinsurance intermediaries. It also provides municipal bond guarantee reinsurance, which focuses 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. In addition, the company offers capital solutions for boutique asset and wealth managers for generational ownership transfers, management buyouts, acquisition and growth finance, and legacy partner liquidity; strategic advice; investment management; and specialty electrical contracting services. Further, it operates as a full-service MGA and program administrator for specialty property and casualty insurance for the real estate and hospitality end markets, and start-up programs; and an MGA for leisure travel and global expatriate medical insurance in Israel, the European Union, and Australia. The company was formerly known as Fund American Enterprises Holdings, Inc. and changed its name to White Mountains Insurance Group, Ltd. in 1999. White Mountains Insurance Group, Ltd. was incorporated in 1980 and is headquartered in Hamilton, Bermuda.

Key Executives

Name Position
Liam Caffrey Chief Executive Officer & Director
Timothy Michael Miller Chief Executive Officer of OneBeacon Ltd, President of OneBeacon Ltd and Chief Operating Officer of Onebeacon
David Grant Staples Head of Tax
Dennis Beaulieu Treasurer
George Manning Rountree Senior Advisor
Giles Edward Harrison President
Jennifer L. Moyer Chief Administrative Officer & Corporate Secretary
Jonathan Adam Cramer Chief Investment Officer
Michael Papamichael MD & CFO
Michaela J. Hildreth MD & Chief Accounting Officer
Robert Lawrence Seelig Executive Vice President, General Counsel & Investor Relation

Latest SEC Filings

Date Type Title
Aug 31, 2026 4 Filing
Aug 27, 2026 4 Filing
Aug 27, 2026 3 Filing
Aug 27, 2026 8-K Current Report
Aug 26, 2026 N-PX Filing
Aug 12, 2026 13F-HR Quarterly report filed by institutional managers, ...
Aug 06, 2026 10-Q Quarterly Report
Aug 06, 2026 8-K Current Report
Jun 30, 2026 11-K Filing
Jun 05, 2026 8-K Current Report
View All SEC Filings
White Mountains Insurance Group Ltd.
White Mountains Insurance Group Ltd. logo
Country Bermuda
IPO Date Oct 22, 1985
Industry Insurance - Diversified
Sector Financial Services
Employees 1,648
CEO Liam Caffrey

Contact Details

A.S. Cooper Building Hamilton, New Hampshire HM 11 Bermuda

Stock Details

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

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