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.
| Country | Bermuda |
| Founded | 1980 |
| Industry | Insurance - Property & Casualty |
| Sector | Financials |
| Employees | 893 |
| CEO | Liam Caffrey |
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 |
|---|---|
| Liam P. Caffrey | Chief Executive Officer and Director |
| Giles Edward Harrison | President and Chief Strategy Officer |
| Michaela J. Hildreth | MD and Chief Accounting Officer |
| Robert Lawrence Seelig Esq. | Executive Vice President, General Counsel and Investor Relation |
| George Manning Rountree | Senior Advisor |
| Michael Papamichael | MD and Chief Financial Officer |
| Jonathan Adam Cramer | Chief Investment Officer |
| Jennifer L. Moyer | Chief Administrative Officer and Corporate Secretary |
| David Grant Staples | Head of Tax |
| Dennis Beaulieu | Treasurer |
Latest SEC Filings
| Date | Type | Title |
|---|---|---|
| Jan 7, 2026 | 8-K | Current Report |
| Dec 29, 2025 | SC TO-I/A | Filing |
| Dec 22, 2025 | SC TO-I/A | Filing |
| Dec 8, 2025 | 8-K | Current Report |
| 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 |