For the twelve months ended Sep 30, 2026, White Mountains Insurance Group Ltd. reported $3.61B of revenue and $969.10M of net income.
WTM revenue was $641.10M in fiscal Q3 2026 (ended Sep 30, 2026), down 25.8% from a year earlier and down 24.1% from the prior quarter. For the full fiscal 2025 it was $3.73B, up 66.8% from fiscal 2024. Compound annual growth was +33.1% over 5 years and +23.8% over 10 years. It rose in 8 of the last 10 fiscal years. Fiscal 2025 is the highest of the 15 fiscal years on file.
WTM net income was -$39.00M in fiscal Q3 2026 (ended Sep 30, 2026), compared with $113.80M a year earlier. For the full fiscal 2025 it was $1.11B, up 380.2% from fiscal 2024. Compound annual growth was +9.3% over 5 years and +14.1% over 10 years. It rose in 1 of the last 3 fiscal years. Fiscal 2025 is the highest of the 15 fiscal years on file.
WTM diluted EPS was -$17.71 in fiscal Q3 2026 (ended Sep 30, 2026), compared with $44.18 a year earlier. For the full fiscal 2025 it was $430.14, up 379.1% from fiscal 2024. Compound annual growth was +13.6% over 5 years and +24.0% over 10 years.
| Line item | Dec 31, 2025 | Dec 31, 2024 | Dec 31, 2023 | Dec 31, 2022 | Dec 31, 2021 | Dec 31, 2020 | Dec 31, 2019 | Dec 31, 2018 | Dec 31, 2017 | Dec 31, 2016 |
|---|---|---|---|---|---|---|---|---|---|---|
| Revenue | $3.73B | $2.24B | $2.17B | $1.16B | $614.40M | $895.60M | $893.40M | $401.20M | $373.80M | $157.70M |
| Cost of revenue | $151.80M | $29.60M | $40.40M | $98.60M | $69.30M | $11.30M | $48.10M | $248.70M | $139.40M | $102.00M |
| Selling, general and admin | $606.60M | $490.10M | $432.60M | $364.10M | $291.60M | $207.90M | $328.20M | $233.50M | $208.00M | $175.50M |
| Interest expense | $78.40M | $60.80M | $62.70M | $40.30M | $20.50M | - | - | - | - | - |
| Pre-tax income | $1.33B | $316.70M | $565.40M | -$149.40M | -$273.60M | $660.40M | $405.10M | -$178.20M | $7.80M | -$147.30M |
| Income tax | $126.90M | $32.60M | -$15.50M | $41.40M | $44.40M | -$14.80M | $29.30M | -$4.00M | -$7.80M | -$32.90M |
| Net income | $1.11B | $230.40M | $509.20M | $792.80M | -$275.40M | $708.70M | $414.50M | -$141.20M | $627.20M | $401.80M |
| EPS, basic | $430.14 | $89.79 | $198.60 | $276.96 | -$89.46 | $226.97 | $130.27 | -$41.76 | $146.06 | $80.11 |
| EPS, diluted | $430.14 | $89.79 | $198.60 | $276.96 | -$89.46 | $226.97 | $130.27 | -$41.76 | $146.06 | $80.06 |
| Diluted shares | 2.5M | 2.5M | 2.5M | 2.8M | 3.0M | 3.1M | 3.1M | 3.3M | 4.2M | 5.0M |
| Line item | Dec 31, 2025 | Dec 31, 2024 | Dec 31, 2023 | Dec 31, 2022 | Dec 31, 2021 | Dec 31, 2020 | Dec 31, 2019 | Dec 31, 2018 | Dec 31, 2017 | Dec 31, 2016 |
|---|---|---|---|---|---|---|---|---|---|---|
| Cash and equivalents | $185.60M | $266.40M | $122.40M | $255.00M | $147.70M | $84.60M | $71.00M | $110.30M | $97.10M | $80.20M |
| Short-term investments | - | - | - | - | - | - | - | - | - | $174.90M |
| Goodwill | $614.10M | $439.20M | $168.80M | $176.50M | $142.30M | $525.50M | $394.70M | $379.90M | $25.90M | $25.90M |
| Total assets | $12.31B | $9.93B | $8.39B | $7.39B | $7.00B | $4.83B | $3.98B | $3.36B | $3.66B | $6.52B |
| Total debt | $837.00M | $562.50M | $564.60M | $575.20M | $420.90M | $376.40M | $283.50M | $192.70M | $23.80M | $12.70M |
| Total liabilities | $6.05B | $4.79B | $3.82B | $3.45B | $3.30B | $1.01B | $838.50M | $644.40M | $298.40M | $2.80B |
| Shareholders' equity | $5.43B | $4.48B | $4.24B | $3.75B | $3.55B | $3.91B | $3.26B | $2.72B | $3.49B | $3.58B |
| Line item | Dec 31, 2025 | Dec 31, 2024 | Dec 31, 2023 | Dec 31, 2022 | Dec 31, 2021 | Dec 31, 2020 | Dec 31, 2019 | Dec 31, 2018 | Dec 31, 2017 | Dec 31, 2016 |
|---|---|---|---|---|---|---|---|---|---|---|
| Operating cash flow | $550.50M | $586.80M | $404.10M | $365.00M | $38.60M | -$60.60M | -$120.50M | -$31.10M | $94.60M | -$155.10M |
| Investing cash flow | -$666.90M | -$447.00M | -$543.90M | $115.50M | -$208.30M | $64.60M | -$59.90M | $459.20M | $718.50M | $1.28B |
| Financing cash flow | $35.60M | $4.20M | $7.20M | -$344.90M | $217.60M | $49.00M | $230.50M | -$414.30M | -$699.00M | -$948.40M |
| Dividends paid | $2.60M | $2.50M | $2.60M | $3.00M | $3.10M | $3.20M | $3.20M | $3.80M | $4.60M | $5.40M |
| Share repurchases | $202.60M | $7.90M | $32.70M | $615.80M | $107.50M | $85.20M | $0 | $511.90M | $714.60M | $881.30M |
| Stock-based compensation | $18.50M | $16.30M | $15.30M | $14.00M | $14.70M | - | - | - | - | - |
| Depreciation and amortization | $9.00M | -$6.40M | -$17.80M | $4.30M | $21.60M | $9.60M | $29.80M | $25.70M | $22.40M | $20.40M |
| Line item | Dec 31, 2025 | Dec 31, 2024 | Dec 31, 2023 | Dec 31, 2022 | Dec 31, 2021 | Dec 31, 2020 | Dec 31, 2019 | Dec 31, 2018 | Dec 31, 2017 | Dec 31, 2016 |
|---|---|---|---|---|---|---|---|---|---|---|
| Revenue growth, YoY | 66.8% | 3.4% | 87.1% | 88.5% | -31.4% | 0.2% | 122.7% | 7.3% | 137.0% | -64.2% |
| Net income growth, YoY | 380.2% | -54.8% | -35.8% | - | - | 71.0% | - | - | 56.1% | 36.1% |
| EPS growth, YoY | 379.1% | -54.8% | -28.3% | - | - | 74.2% | - | - | 82.4% | 59.5% |
| Net margin | 29.6% | 10.3% | 23.5% | 68.5% | -44.8% | 79.1% | 46.4% | -35.2% | 167.8% | 254.8% |
| Return on equity | 20.4% | 5.1% | 12.0% | 21.2% | -7.8% | 18.1% | 12.7% | -5.2% | 18.0% | 11.2% |
| Return on assets | 9.0% | 2.3% | 6.1% | 10.7% | -3.9% | 14.7% | 10.4% | -4.2% | 17.1% | 6.2% |
| Debt to equity | 0.15 | 0.13 | 0.13 | 0.15 | 0.12 | 0.10 | 0.09 | 0.07 | 0.01 | 0.00 |
| Line item | Sep 30, 2026 | Jun 30, 2026 | Mar 31, 2026 | Dec 31, 2025 | Sep 30, 2025 | Jun 30, 2025 | Mar 31, 2025 | Dec 31, 2024 | Sep 30, 2024 | Jun 30, 2024 | Mar 31, 2024 | Dec 31, 2023 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Revenue | $641.10M | $844.60M | $517.80M | $1.60B | $864.20M | $689.20M | $577.80M | $358.00M | $839.10M | $395.40M | $647.30M | $736.80M |
| Cost of revenue | $91.80M | $80.10M | $42.70M | $46.60M | $55.30M | $42.40M | $7.50M | $7.40M | $7.60M | $7.00M | $7.60M | $6.90M |
| Selling, general and admin | $141.60M | $143.30M | $144.90M | $214.40M | $169.00M | $132.40M | $96.00M | $120.50M | $121.90M | $122.50M | $125.20M | $134.40M |
| Interest expense | $20.70M | $19.80M | $19.30M | $22.10M | $19.90M | $18.60M | $17.80M | $14.10M | $16.70M | $14.80M | $15.20M | $17.80M |
| Pre-tax income | -$23.20M | $256.00M | -$25.50M | $901.00M | $178.80M | $176.50M | $72.40M | -$120.70M | $239.50M | -$34.70M | $232.60M | $327.80M |
| Income tax | $6.40M | $24.80M | $800.0K | $87.30M | $17.10M | $12.90M | $9.60M | $3.70M | $11.60M | $6.50M | $10.80M | -$34.90M |
| Net income | -$39.00M | $199.50M | -$27.20M | $835.80M | $113.80M | $122.90M | $33.90M | -$130.40M | $179.00M | -$54.60M | $236.40M | $286.50M |
| EPS, basic | -$17.71 | $80.58 | -$12.59 | $325.02 | $44.18 | $47.75 | $13.19 | -$50.98 | $69.68 | -$21.24 | $92.33 | $111.93 |
| EPS, diluted | -$17.71 | $80.58 | -$12.59 | $325.02 | $44.18 | $47.75 | $13.19 | -$50.98 | $69.68 | -$21.24 | $92.33 | $111.93 |
| Diluted shares | 2.4M | 2.4M | 2.4M | - | 2.5M | 2.5M | 2.5M | - | 2.5M | 2.5M | 2.5M | - |
| Line item | Sep 30, 2026 | Jun 30, 2026 | Mar 31, 2026 | Dec 31, 2025 | Sep 30, 2025 | Jun 30, 2025 | Mar 31, 2025 | Dec 31, 2024 | Sep 30, 2024 | Jun 30, 2024 | Mar 31, 2024 | Dec 31, 2023 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cash and equivalents | $167.40M | $127.80M | $137.00M | $185.60M | $474.20M | $337.80M | $312.00M | $266.40M | $346.00M | $255.20M | $225.30M | $122.40M |
| Goodwill | $720.70M | $795.90M | $615.30M | $614.10M | $1.09B | $534.60M | $439.20M | $439.20M | $439.20M | $439.20M | $439.20M | $168.80M |
| Total assets | $13.36B | $13.77B | $13.17B | $12.31B | $12.35B | $11.82B | $11.00B | $9.93B | $10.34B | $10.17B | $9.59B | $8.39B |
| Total debt | $928.60M | $932.50M | $834.80M | $837.00M | $870.40M | $694.60M | $676.10M | $562.50M | $544.90M | $530.20M | $532.10M | $564.60M |
| Total liabilities | $7.14B | $7.51B | $6.99B | $6.05B | $6.63B | $6.48B | $5.87B | $4.79B | $5.08B | $5.29B | $4.70B | $3.82B |
| Shareholders' equity | $5.35B | $5.39B | $5.37B | $5.43B | $4.77B | $4.64B | $4.51B | $4.48B | $4.61B | $4.42B | $4.47B | $4.24B |
| Line item | Sep 30, 2026 | Jun 30, 2026 | Mar 31, 2026 | Dec 31, 2025 | Sep 30, 2025 | Jun 30, 2025 | Mar 31, 2025 | Dec 31, 2024 | Sep 30, 2024 | Jun 30, 2024 | Mar 31, 2024 | Dec 31, 2023 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Operating cash flow | $356.60M | -$55.50M | $30.50M | $53.90M | $359.30M | $177.50M | -$40.20M | $64.10M | $269.40M | $216.80M | $36.50M | $24.50M |
| Investing cash flow | -$306.30M | $143.40M | -$29.80M | -$215.00M | -$295.40M | -$163.80M | $7.30M | -$163.20M | -$189.60M | -$194.80M | $100.60M | -$88.90M |
| Financing cash flow | -$10.70M | -$97.10M | -$49.30M | -$127.50M | $72.50M | $12.10M | $78.50M | $19.50M | $11.00M | $7.90M | -$34.20M | $24.00M |
| Dividends paid | $0 | $0 | $2.40M | $0 | $0 | $0 | $2.60M | $0 | $0 | $0 | $2.50M | $0 |
| Share repurchases | $0 | $190.90M | $25.90M | $192.70M | $0 | $0 | $9.90M | -$200.0K | $0 | $0 | $8.10M | $0 |
| Stock-based compensation | $5.40M | $5.40M | $4.10M | $4.90M | $4.90M | $4.90M | $3.80M | $4.50M | $4.30M | $4.30M | $3.20M | $4.10M |
| Depreciation and amortization | $11.70M | $9.20M | $4.80M | $6.40M | $2.30M | -$800.0K | $1.10M | $1.10M | -$2.70M | -$2.70M | -$2.10M | -$7.50M |
| Line item | Sep 30, 2026 | Jun 30, 2026 | Mar 31, 2026 | Dec 31, 2025 | Sep 30, 2025 | Jun 30, 2025 | Mar 31, 2025 | Dec 31, 2024 | Sep 30, 2024 | Jun 30, 2024 | Mar 31, 2024 | Dec 31, 2023 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Revenue growth, YoY | -25.8% | 22.5% | -10.4% | 348.0% | 3.0% | 74.3% | -10.7% | -51.4% | 61.5% | 4.5% | 21.7% | 68.4% |
| Net income growth, YoY | - | 62.3% | - | - | -36.4% | - | -85.7% | - | 658.5% | - | 31.7% | 609.2% |
| EPS growth, YoY | - | 68.8% | - | - | -36.6% | - | -85.7% | - | 658.2% | - | 32.2% | 611.6% |
| Net margin | -6.1% | 23.6% | -5.3% | 52.1% | 13.2% | 17.8% | 5.9% | -36.4% | 21.3% | -13.8% | 36.5% | 38.9% |
| Debt to equity | 0.17 | 0.17 | 0.16 | 0.15 | 0.18 | 0.15 | 0.15 | 0.13 | 0.12 | 0.12 | 0.12 | 0.13 |
Source: XBRL data White Mountains Insurance Group Ltd. files with the SEC, latest filing dated Nov 5, 2026 (see filings on SEC EDGAR). Provided for information only, not investment advice. Check the filing before relying on a number.
* Worked out from the filings rather than stated in them: Q4 is the full year less the first nine months.
Per-share figures are as filed. The filings show no stock split in these periods.
EPS growth is left out where the share count moved enough to suggest a split the filings do not show. Growth rates need a positive starting figure. CAGR is compound annual growth between fiscal years. The CSV holds every period on file, in full figures, from the same SEC filings.
| Company | Revenue | Growth | Net income | Net margin | Market cap |
|---|---|---|---|---|---|
| WTM | $3.61B | +44.9% | $969.10M | 26.9% | $5.39B |
| CB | $61.85B | +5.7% | $11.23B | 18.2% | $138.87B |
| PGR | $91.73B | +7.7% | $11.62B | 12.7% | $131.82B |
| TRV | $48.92B | +1.1% | $8.33B | 17.0% | $80.99B |
| ALL | $70.23B | +5.1% | $11.61B | 16.5% | $62.80B |
| AIG | $27.73B | +1.2% | $3.29B | 11.9% | $41.28B |
| HIG | $29.87B | +9.2% | $4.61B | 15.4% | $36.06B |
| ACGL | $18.78B | -3.9% | $4.38B | 23.3% | $35.20B |
| CINF | $13.28B | +9.9% | $2.66B | 20.1% | $28.58B |