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White Mountains Insurance Group, Ltd. (WTM)

White Mountains Insurance Group, Ltd. at a glance — key fundamentals, SEC filings, insider buying and selling, and earnings dates.

White Mountains Insurance Group, Ltd. (WTM) is a Insurance - Property & Casualty company based in BM with a market capitalization of $5.1B. Revenue grew 15.0% year-over-year and free cash flow was negative at -$7.2M. This page tracks WTM's SEC filings, insider buying and selling, earnings dates, and key fundamentals in one place.

BM · 893 employees · IPO Oct 23, 1985

Valuation

Valuation & price

$2137.16 · as of May 17, 2026 · -7.9% vs 52w high

4.9

P/E ratio

Latest-FY diluted EPS

0.95

P/B ratio

Market cap ÷ book equity

—

Dividend yield

Price — last 12 months

$2.3K$2.0K$1.7KJul 25Dec 25Jul 26Jul 7, 25$1784.75Jul 9, 25$1803.82Jul 11, 25$1801.74Jul 15, 25$1793.11Jul 17, 25$1812.00Jul 21, 25$1778.74Jul 23, 25$1788.21Jul 25, 25$1789.58Jul 29, 25$1796.89Jul 31, 25$1787.80Aug 4, 25$1774.50Aug 6, 25$1782.71Aug 11, 25$1783.51Aug 13, 25$1869.81Aug 15, 25$1769.60Aug 19, 25$1813.09Aug 21, 25$1841.41Aug 25, 25$1828.05Aug 27, 25$1845.42Aug 29, 25$1830.18Sep 3, 25$1772.52Sep 5, 25$1796.03Sep 9, 25$1794.69Sep 11, 25$1774.51Sep 16, 25$1715.50Sep 18, 25$1753.62Sep 22, 25$1765.90Sep 24, 25$1756.99Sep 26, 25$1715.94Sep 30, 25$1671.52Oct 2, 25$1664.56Oct 6, 25$1864.48Oct 8, 25$1896.20Oct 10, 25$1898.00Oct 14, 25$1933.01Oct 16, 25$1847.67Oct 21, 25$1920.91Oct 23, 25$1937.93Oct 27, 25$1932.90Oct 29, 25$1897.99Oct 31, 25$1904.56Nov 4, 25$1920.60Nov 6, 25$1892.02Nov 10, 25$1901.76Nov 12, 25$1934.47Nov 14, 25$1924.67Nov 18, 25$1900.34Nov 20, 25$1881.61Nov 25, 25$2003.65Nov 28, 25$2024.25Dec 2, 25$2027.41Dec 4, 25$2037.79Dec 8, 25$2013.52Dec 10, 25$2040.94Dec 12, 25$2054.51Dec 16, 25$2045.31Dec 18, 25$2040.00Dec 22, 25$2083.14Dec 24, 25$2088.05Dec 29, 25$2075.53Jan 2, 26$2041.90Jan 6, 26$2047.31Jan 8, 26$2074.49Jan 12, 26$2060.84Jan 14, 26$2076.96Jan 16, 26$2056.36Jan 21, 26$2073.85Jan 23, 26$2056.64Jan 27, 26$2052.44Jan 29, 26$2052.17Feb 2, 26$2056.36Feb 4, 26$2086.14Feb 9, 26$2098.78Feb 11, 26$2143.84Feb 13, 26$2188.07Feb 18, 26$2202.12Feb 20, 26$2228.13Feb 24, 26$2223.42Feb 26, 26$2222.97Mar 2, 26$2244.14Mar 4, 26$2223.79Mar 6, 26$2165.60Mar 10, 26$2223.46Mar 12, 26$2182.05Mar 17, 26$2206.81Mar 19, 26$2181.16Mar 23, 26$2162.99Mar 25, 26$2205.51Mar 27, 26$2153.86Mar 31, 26$2196.96Apr 2, 26$2169.76Apr 7, 26$2215.73Apr 9, 26$2309.92Apr 13, 26$2297.99Apr 15, 26$2291.46Apr 17, 26$2319.41Apr 22, 26$2269.19Apr 24, 26$2259.27Apr 28, 26$2263.69Apr 30, 26$2231.99May 4, 26$2167.41May 6, 26$2080.00May 8, 26$2128.40May 12, 26$2109.20May 14, 26$2112.72May 18, 26$2138.35May 20, 26$2144.81May 22, 26$2146.85May 28, 26$2084.31Jun 1, 26$2062.03Jun 3, 26$2034.02Jun 5, 26$2065.14Jun 9, 26$2004.76Jun 11, 26$1989.54Jun 15, 26$2030.64Jun 17, 26$2003.49Jun 22, 26$2010.75Jun 24, 26$2022.41Jun 26, 26$2096.56Jul 2, 26$2173.81
$1650.5052-week range$2319.41
Loading valuation history…

Fundamentals

Key fundamentals

$5.1B

Market cap

15.0%

Revenue growth (YoY)

53.7%

Gross margin

-$7.2M

Free cash flow (USD)

-$2.3B

Net debt

Net cash position

0.9%

Share dilution

3/4

Graham criteria passed

Defensive-investor screen

Financial Services

Sector

Trajectory

Long-term trends

Revenue by year

2016 → 2025

FY 2016$157.7MFY 2017$373.8MFY 2018$369.1MFY 2019$893.4MFY 2020$895.6MFY 2021$614.4MFY 2022$1.2BFY 2023$2.2BFY 2024$2.4BFY 2025$2.7B
$157.7M$2.7B

Free cash flow by year

2016 → 2025

FY 2016$-159.4MFY 2017$169.2MFY 2018$-31.1MFY 2019$-120.5MFY 2020$-12.8MFY 2021$98.2MFY 2022$434.0MFY 2023$404.1MFY 2024$586.8MFY 2025$-7.2M
-$159.4M-$7.2M

Gross margin by year

2021 → 2025

FY 20215.4%FY 202232.0%FY 202353.1%FY 202445.6%FY 202553.7%
5.4%53.7%

Value screen

Graham defensive-investor tests

Computing the scorecard — refreshing any stale inputs…

0

Insider buys · 90 days

0

Insider sells · 90 days

Earnings

Last report: 10-Q filed May 6, 2026

Next expected: not yet scheduled

On the tape

Recent SEC & insider activity

  • 8-K eventAnnual Investor PresentationJun 5, 2026Filing
  • 8-K eventDirector DepartureMay 21, 2026Filing
  • 8-K eventDebt IssuanceMay 15, 2026Filing
  • 8-K eventEarnings ReleaseMay 6, 2026Filing
  • Quarterly report10-Q FiledMay 6, 2026Filing
  • 8-K eventAcquisition AnnouncedApr 1, 2026Filing

Questions

Frequently asked questions

What is White Mountains Insurance Group, Ltd.'s market cap?

White Mountains Insurance Group, Ltd. (WTM) has a market capitalization of $5.1B.

What is WTM's P/E ratio?

WTM trades at a price-to-earnings ratio of 4.9, based on its latest fiscal-year diluted earnings per share and the most recent cached price.

What is WTM's price-to-book (P/B) ratio?

WTM trades at 0.95 times book value per share.

Are insiders buying WTM stock?

SEC Form 4 filings show no open-market insider buys at White Mountains Insurance Group, Ltd. in the last 90 days (0 sells).

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Timeline

Every filing, insider trade & earnings on a price-anchored timeline

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News

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Data: SEC EDGAR filings and cached fundamental data; prices and ratios use the most recent cached quote and statements (may lag by up to a day). Educational and research purposes only. Not investment advice.