With a market capitalization (market cap) of $5.01B — a measure of how much the company is worth — White Mountains Insurance Group, Ltd. ranks #1,366 among the 2,510 companies tracked, and 217th in Financial Services as of October 3, 2026. Shares trade at $2,020.93, up 0.39% on the day.
of 2,510 tracked
Market-cap change uses historical capitalization records. Share-price returns are a different series — they can diverge when the share count changes. Those returns are not a CAGR until you pick a start value, an ending value, and years. CAGR calculator. Market cap vs. stock price.
Year-end values and the chart both come from historical market-cap records, not from applying today's share count to past prices. Latest historical observation October 2, 2026. Ranking headline cap is the snapshot figure as of October 3, 2026.
| Year | As of | Market cap | Annual change | Year-end close |
|---|---|---|---|---|
| 2026 | Oct 2, 2026 | $4.87B | -8.33% | $2,020.92 |
| 2025 | Dec 31, 2025 | $5.31B | +7.39% | $2,078.03 |
| 2024 | Dec 31, 2024 | $4.94B | +28.23% | $1,945.06 |
| 2023 | Dec 29, 2023 | $3.85B | +5.84% | $1,505.01 |
Ranking figure $5.01B as of October 3, 2026.
White Mountains Insurance Group, Ltd.'s ranking market cap is the provider-reported capitalization on the same snapshot as the rest of this site, with a share price of $2,020.93 as of October 2, 2026. Charts and the year-end table use a separate historical market-cap series, last observed at $4.87B on October 2, 2026. See how the ranking works.
Live shares outstanding are not on the quote used for price, so this page does not invent a current share count. Shares outstanding vs. float.
The latest annual report (FY 2025) used a weighted-average 2,554,167 shares. That figure is an average for the year, not the live count in the market-cap formula.
Book equity: assets minus liabilities on the latest annual report.
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FY 2025 net worth
Largest U.S.-listed names in the same FMP sector — not a hand-picked competitor set.
| Rank | Company | Market cap | 1D |
|---|---|---|---|
| #13 | Berkshire Hathaway Inc. BRK-B | $1.08T | +0.43% |
| #16 | JPMorgan Chase & Co. JPM | $890.62B | -0.24% |
| #20 |
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.
Summary from the company profile (Financial Modeling Prep). Principal financial figures above are for FY 2025.
Visit websiteAs of October 3, 2026, White Mountains Insurance Group, Ltd. (WTM) is worth $5.01B — that is its market capitalization, the total value of its outstanding shares on MarketCapLens.
A company’s net worth is its shareholders’ equity: assets minus liabilities on the balance sheet. That is book equity, not market cap. For FY 2025, White Mountains Insurance Group, Ltd.’s book equity is about $6.26B. Market cap is the market value of the outstanding shares. As of October 3, 2026, its market cap is $5.01B. Book equity is an accounting remainder; market cap is a trading value. Neither is a person’s net worth.
White Mountains Insurance Group, Ltd. ranks #1,366 among the 2,510 companies tracked on MarketCapLens. In Financial Services it ranks #217 of 412.
Fundamentals are annual. Figures labeled with their fiscal year. Live ratios use the current price against those annual earnings.
Over the past year, market cap and share price moved by different amounts. Share count can change independently of price. What changes market cap.
| 2022 |
|---|
| Dec 30, 2022 |
| $3.64B |
| +20.67% |
| $1,414.33 |
| 2021 | Dec 31, 2021 | $3.02B | — | $1,013.90 |
|---|
Last observation of each calendar year from historical market-cap records. The current year is through the latest date, not a completed year-end. Share-price close is the matching session for context — we do not rebuild cap from today's share count.
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FY 2025
| $673.37B |
| +0.23% |
| #23 | Mastercard Incorporated MA | $484.35B | +0.41% |
| #33 | Bank of America Corporation BAC | $381.44B | +0.04% |
| #39 | HSBC Holdings plc HSBC | $330.41B | +0.33% |
Companies immediately above and below in the overall ranking. They may be in a different sector.
| Rank | Company | Market cap | 1D |
|---|---|---|---|
| #1363 | Vail Resorts, Inc. MTN | $5.03B | +1.56% |
| #1364 | CNO Financial Group, Inc. CNO | $5.03B | +1.47% |
| #1365 | Golar LNG Limited GLNG | $5.01B | +1.88% |
| #1367 | ADT Inc. ADT | $5B | +0.40% |
| #1368 | Definium Therapeutics, Inc. DFTX | $4.96B | -0.53% |
| #1369 | Graham Holdings Company GHC | $4.96B | -0.15% |
White Mountains Insurance Group, Ltd.’s ranking market cap of $5.01B comes from the same snapshot as the rest of this site, as of October 3, 2026. It is not share price multiplied by the FY 2025 weighted-average share count of 2,554,167. The historical market-cap series last observed $4.87B on October 2, 2026.
Over the past year, White Mountains Insurance Group, Ltd.’s market cap is up 14.44%, using historical market-cap records rather than today’s share count applied to past prices.
White Mountains Insurance Group, Ltd. (WTM) shares trade at $2,020.93, up 0.39% on the day, as of October 3, 2026.
White Mountains Insurance Group, Ltd. trades at a live price-to-earnings (P/E) ratio of 4.7, using the latest share price divided by the latest annual earnings per share. That is not the same as a fiscal-year reported P/E.