White Mountains (NYSE: WTM) is a diversified insurance and related financial services holding company that owns and manages businesses seeking a stable, sophisticated partner to drive value creation. Grounded in the core principles of our visionary founder Jack Byrne, we have been careful, opportunistic and successful stewards of our shareholders’ capital for more than three decades. We are most proud and protective of our reputation as a good partner – to our shareholders, to other stakeholders in our businesses and to the talented management teams who run them. In the end, doing right by your partners is what guarantees the next deal and the deal after that. We are domiciled in Hamilton Bermuda, with executive headquarters in Hanover, New Hampshire, and offices in Boston, and Guilford, Connecticut. For information about career opportunities at White Mountains, please contact careers@whitemountains.com
| Website | https://www.whitemountains.com |
| Ticker | WTM |
| Revenue | $2.4 billion |
| Employees | 156 (41 on RocketReach) |
| Founded | 1985 |
| Phone | +1 603-640-2200 |
| Fax | (603) 643-4592 |
| Technologies |
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| Industry | Financial Services, Insurance, Property and Casualty Insurance |
| Web Rank | 5 Million |
| Keywords | Insurance, Financial Services, Reinsurance, Risk Management, Insurance Holding, Investment Management, Diversified Holdings, Alternative Assets, Asset Management, Strategic Partnerships, Portfolio Management, Value Creation, Capital Markets, Long-Term Investments, Business Management |
| Competitors | Allstate Financial Services, LLC, Prudential Financial, Progressive Insurance, Chubb, AIG, Travelers, The Hartford, Berkshire Hathaway, Markel, Safeco Insurance +34 more (view full list) |
| SIC | SIC Code 67 Companies, SIC Code 63 Companies, SIC Code 671 Companies |
| NAICS | NAICS Code 524 Companies, NAICS Code 55 Companies, NAICS Code 5241 Companies, NAICS Code 52 Companies |
Looking for a particular White Mountains employee's phone or email?
The White Mountains annual revenue was $2.4 billion in 2026.
Jason Lichtenstein is the Managing Director and Deputy General Counsel of White Mountains.
41 people are employed at White Mountains.
The NAICS codes for White Mountains are [524, 55, 5241, 52].
The SIC codes for White Mountains are [67, 63, 671].