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White Mountains Insurance Group LTD (WTM) stock

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NYSE: WTM NYSE Property & Casualty Insurance Next results ~November 5, 2026

B+ Fundamentals grade

White Mountains Insurance Group LTD is a US-listed company in the property & casualty insurance industry. Its financial year ends in December.

Who’s trading

What company insiders, investment funds and members of Congress have been doing with the stock, from their own filings.

  • Insiders0 buying, 3 selling0 purchases and 4 sales by directors and officers, last 12 monthsInsider trades
  • Funds129 adding, 186 cuttingOf 43 active managers that changed their stake, 18 added; quarter to June 30, 2026Fund buyers and sellers

Value diary

Our note on each quarter White Mountains Insurance Group files

Where White Mountains Insurance stands after its latest 10-Q

Revenue for the twelve months to June 2026 was $3.83bn, up 55.4% on a year earlier, slower than 69.3% a quarter earlier. That growth ranks 1 of 8 among the fire, marine & casualty insurance companies we cover. The diluted share count is down 2.3% on a year earlier, which lifts each remaining share.

Our model value for White Mountains Insurance Group is under review, so past values are not shown until it is resolved.

Source: 10-Q filed August 6, 2026 on SEC EDGAR · Financials · Valuation

Written from the company's filings and our models when each quarter's report arrives. Figures in older notes are as published at the time. Not investment advice.

The Fundamentalytics view

Next results ~November 5, 2026 (estimated)

White Mountains Insurance Group LTD's trailing-twelve-month revenue grew 55.4% year on year, with a free-cash-flow margin of 9.5%. Where it stands out: net margin of 29.3% ranks 3 of 48 property & casualty insurance companies we cover. Where it lags: change in growth rate of -13.9pp ranks 46 of 48 property & casualty insurance companies we cover.

Current signal Free cash flow diverging from earnings: TTM free cash flow fell 22.6% while net income grew 446.2%: a 469pp divergence.

Assembled from SEC-filed figures — the full workings are on this page and in our methodology. Observations, not recommendations.

Highlights

How we pick these

Strengths

  • Fast growth. Revenue grew 55.4% over the last 12 months, against a median of 8.3% for property & casualty insurance companies we cover.
  • Shrinking share count. Diluted shares fell 2.3% in a year, so each share owns more of the business.

Things to watch

  • Results due soon. Results are expected around 5 November; the share price can move sharply on the day.
  • Growth slowing. The growth rate is 13.9 points lower than a quarter earlier.
  • Insiders selling. 3 insiders sold $21M of stock over the past 365 days and none bought (0% under pre-set trading plans).
  • Gross margin slipping. Gross margin is down 3.2 points on a year ago.
  • Weak cash conversion. Free cash flow was 33% of net income over the last 12 months.
  • Missing expectations. Earnings per share fell short of the consensus estimate in 3 of the last four quarters.

Latest results: FY2026 Q2

Filed August 6, 2026
Earnings per share
-$2.99 against an average estimate of $1.16: missed by 357.8%
Revenue
$845m, up 22.5% on a year earlier
Share reaction
+1.8% in the first session after the results on August 6, 2026, against +0.5% for the S&P 500
Next report
November 5, 2026

White Mountains Insurance Group's figures from its SEC filings and results release; estimates are the analysts' average. Not a recommendation.

Price chart

  • 1 day+2.1%
  • 1 week+4.0%
  • 1 month+14.7%
  • This year+11.6%
  • 1 year+21.7%
  • 5 years+115.9%
  • S&P 500 this year+11.2%

Closing prices to 2026-11-02. Price change only, dividends excluded.

Loading chart…

Third-party market data · may be delayed

At a glance

Trailing twelve months, from SEC filings

Profitability

Revenue (TTM)
$3.8B
Net margin
29.3%
EPS (TTM, diluted)
$452.84

Growth

Revenue growth
+55.4%
Change in growth rate
−13.9 pts
Share count change
−2.3%

Earnings

Last results
August 6, 2026
Next results (est.)
November 5, 2026

News & updates

Updated October 31, 2026

Company announcements, filed results and changes that matter to shareholders.

  1. Leadership
  2. Results

Refreshed hourly when new source data is available. Summaries are checked against company releases and SEC filings. Company announcement headlines are labelled when a checked summary is unavailable.

Valuation

White Mountains Insurance Group LTD valuation models and calculator

No model value for White Mountains Insurance Group LTD at the moment. Current status: valuation models disagree too widely to rate. Available reported financials are shown below.

Fundamentalytics rating

model v1.6 · 2026-11-03

Not rated: valuation models disagree too widely to rate: held for review.

The inputs used by the models below have passed source checks. Individual model values are available below and in the interactive valuator. Their differences are shown explicitly; the platform combined value and recommendation remain withheld.

Valuation models

We value White Mountains Insurance Group LTD as an insurer, with every model that fits that kind of business. Cost of equity 7.6%: the 10-year Treasury yield (4.9%) plus a beta of 0.6 times a 4.5% equity risk premium.

Value per share by model
Model Value per share In the combined value?
Residual income Book value plus the present value of returns above the cost of equity, fading over ten years. ~$1800 ~$1100–$3000 Primary model, counts double
Justified price-to-book Book value times (return on equity - growth) / (cost of equity - growth): steady-state returns. ~$1600 ~$1300–$2100 Included
Price-to-book vs return on equity (peers) The price-to-book that peers with this return on equity trade on, from a line fitted across peers. ~$2700 ~$1200–$4300 Included
Price-to-book vs peers Book value per share times peers' typical (harmonic-mean) price-to-book. ~$3000 ~$2600–$5000 Included
Price-to-earnings vs peers Earnings per share times peers' typical (harmonic-mean) price-to-earnings. ~$4400 ~$3900–$6800 Included
Dividend discount (two-stage) Dividends for five years at the growth the business can fund, then a steady payout and growth. ~$1700 ~$1300–$2300 Included
Combined value Individual source-checked model scenarios are available. The platform combined value and recommendation remain withheld. — Combined value withheld. Review the individual models and their assumptions.

Different models fail in different ways, so where several apply we average them rather than trust one. Peer-based models compare White Mountains Insurance Group LTD with property, casualty and specialty insurers in our coverage, using third-party market data. Model values are estimates under stated assumptions, updated as new filings arrive; not price targets or investment advice. How each model works.

Moat

77 /100

Strong moat

How hard White Mountains Insurance Group's competitive advantage looks for rivals to wear away, judged from 10 years of its own filings: returns on capital, pricing power, profit durability, cash conversion and discipline.

  • Returns on capital 20 / 20

    Net income has been a median 5.2% of total assets over 10 years.

  • Durability 9 / 20

    Net margin has been a median 28.2%; its worst year was -66.7%.

  • Discipline 20 / 20

    The diluted share count fell 19.1% over five years; stock-based pay has been a median 0.7% of revenue.

AI disruption exposure: Medium. In this industry, AI could change how the product is made or sold, without replacing the core asset. The score above includes a 5-point deduction for that exposure (82 before it).

A rules-based reading of reported figures, not a forecast and not investment advice. How the score is built: methodology.

Forecasts and guidance

Next results: November 5, 2026, before the open.

Analysts' consensus

No analyst estimates are published for White Mountains Insurance Group LTD: too few analysts cover it.

Earnings against estimates

Quarter toEstimateActualSurprise
Dec 2018 $1.16 −$2.99 −357.8%
Sept 2018 $2.37 −$2.52 −206.1%
Jun 2018 $0.13 −$2.04 −1669.2%
Mar 2018 −$1.07 −$0.61 +42.6%

Adjusted EPS as companies report it, against the average analyst estimate.

Management guidance

Earnings release, August 6, 2026

No numeric guidance in White Mountains Insurance Group LTD's latest earnings release (filed August 6, 2026). Some companies give their outlook only on the earnings call.

Positioning

Short interest
6.3%
of tradable shares
Days to cover
7.54
at average volume
Short interest, 1 month
+8%
to October 15, 2026
Held by institutions
96%
of shares
Held by insiders
3.2%
of shares
Employees
1,648
full time

Consensus figures average analysts' published estimates (third-party data); guidance is the company's own. Neither is our forecast. Short interest is reported twice a month and lags. Market data may be delayed.

This section is general information, not investment advice or a personal recommendation, and it does not take account of your objectives or circumstances. Forecasts and guidance are estimates, not promises: companies miss their own guidance and analysts' figures are often revised. Prices can fall as well as rise, and you can lose money. See our disclaimer.

Share-price performance

Market data may be delayed

Recent prices are available. Older price history and the statistics that need it are being loaded in the background.

What moved the share price

Last 12 months +21.7%

$1903.69 on October 31, 2025 to $2317.42

ThenNowEffect
Revenue (last 12 months) $2.5bn $3.8bn +55.4%
Net margin 8.3% 29.3% +251.4%
P/E multiple 23.5x 5.1x −78.2%
Share count 3m 2m +2.4%

Biggest factor: p/e multiple.

Last 3 years +58.9%

$1458.84 on November 3, 2023 to $2317.42

ThenNowEffect
Revenue (last 12 months) $1.7bn $3.8bn +121.3%
Net margin 65.1% 29.3% −55.0%
P/E multiple 3.4x 5.1x +51.4%
Share count 3m 2m +5.5%

Biggest factor: net margin.

The effects multiply back to the price change exactly. Results are the last 12 months as known on each date (filings assumed public 45 days after quarter end).

Return and risk by year

Calendar year 202120222023202420252026 to date
Return
WTM+1%+40%+7%+29%+7%+12%
Industry peers (median)+15%−3%+9%+31%+9%+10%
S&P 500+29%−18%+26%+25%+18%+11%
Months that ended higher
WTM42%67%50%67%58%64%
S&P 50075%42%67%75%75%46%
Largest fall from a high during the year
WTM−22%−16%−15%−11%−17%−14%
S&P 500−5%−25%−10%−8%−19%−9%

Worst fall since October 29, 2015: 40% from February 11, 2020 to March 18, 2020. Getting back needed a 67% gain, reached on February 10, 2021, 329 days after the low.

Price behaviour

52-week range
$1880.75 – $2319.41
From 52-week high
−0.1%
vs 50-day average
+10.0%
vs 200-day average
+8.4%
Volatility (1 year)
19%
Beta vs S&P 500
0.06

Volatility is the annualised standard deviation of daily returns. Beta 1.5 means the shares typically moved 1.5% for each 1% move in the S&P 500 over the past year. Prices to November 2, 2026.

Share price after results

Next day
5 up, 7 down
typical move ±2.0%
After a week
7 up, 5 down
typical move ±4.1%
After a month
7 up, 5 down
typical move ±4.4%
Results releasedNext dayS&P 500 next day5 days21 days
August 6, 2026 +1.8% +0.5% +1.4% −0.4%
May 6, 2026 −2.7% +1.1% −1.5% −4.0%
February 6, 2026 −1.3% +2.4% +2.9% +4.6%
November 6, 2025 +0.6% −1.0% +0.9% +6.1%
August 7, 2025 −1.7% +0.7% +3.5% −0.9%
May 7, 2025 +0.5% +1.1% −0.6% +2.2%
February 7, 2025 −3.4% −0.2% −7.6% −5.6%
November 6, 2024 +5.8% +3.3% +7.5% +11.8%
August 7, 2024 −3.0% +1.6% −3.1% +0.2%
May 9, 2024 −1.4% +0.7% −7.2% −7.7%
February 7, 2024 +1.3% +0.9% +10.0% +9.5%
November 6, 2023 −0.4% +0.5% +2.7% +0.1%

From the close before the release date to the close 1, 5 and 21 trading days after it, so releases before the open and after the close are both captured. Past moves don't predict future ones.

White Mountains Insurance Group LTD in five measures

Fundamentals grade B+
Growth Profitability Cash Balance sheet

Growth, profitability, cash generation and balance sheet are percentiles against the companies we cover in the same industry, from SEC filings (100 = best). Value compares the share price with our modelled value range (50 = at our base value; higher = cheaper). A description of reported data and our model — not a quality score or advice.

Fundamentals

Revenue (TTM) White Mountains Insurance Group LTD
$1.5B $2B $2.5B $3B $3.5B $4B FY23 Q3 FY24 Q2 FY25 Q1 FY26 Q2 Revenue (TTM), FY23 Q3: $1.9B Revenue (TTM), FY23 Q4: $2.2B Revenue (TTM), FY24 Q1: $2.3B Revenue (TTM), FY24 Q2: $2.3B Revenue (TTM), FY24 Q3: $2.6B Revenue (TTM), FY24 Q4: $2.2B Revenue (TTM), FY25 Q1: $2.2B Revenue (TTM), FY25 Q2: $2.5B Revenue (TTM), FY25 Q3: $2.5B Revenue (TTM), FY25 Q4: $3.7B Revenue (TTM), FY26 Q1: $3.7B Revenue (TTM), FY26 Q2: $3.8B $3.8B

Source: SEC EDGAR filings. Retrieved October 20, 2026.

View chart data
Period Revenue (TTM)
FY23 Q3 $1.9B
FY23 Q4 $2.2B
FY24 Q1 $2.3B
FY24 Q2 $2.3B
FY24 Q3 $2.6B
FY24 Q4 $2.2B
FY25 Q1 $2.2B
FY25 Q2 $2.5B
FY25 Q3 $2.5B
FY25 Q4 $3.7B
FY26 Q1 $3.7B
FY26 Q2 $3.8B
Revenue growth, TTM YoY White Mountains Insurance Group LTD
-50% 0% 50% 100% FY23 Q3 FY24 Q2 FY25 Q1 FY26 Q2 Revenue growth, TTM YoY, FY23 Q3: 90.3% Revenue growth, TTM YoY, FY23 Q4: 87.1% Revenue growth, TTM YoY, FY24 Q1: 59.7% Revenue growth, TTM YoY, FY24 Q2: 32.8% Revenue growth, TTM YoY, FY24 Q3: 40.2% Revenue growth, TTM YoY, FY24 Q4: 3.4% Revenue growth, TTM YoY, FY25 Q1: -4.9% Revenue growth, TTM YoY, FY25 Q2: 7.2% Revenue growth, TTM YoY, FY25 Q3: -4.9% Revenue growth, TTM YoY, FY25 Q4: 66.8% Revenue growth, TTM YoY, FY26 Q1: 69.3% Revenue growth, TTM YoY, FY26 Q2: 55.4% 55.4%

Source: SEC EDGAR filings. Retrieved October 20, 2026.

View chart data
Period Revenue growth, TTM YoY
FY23 Q3 90.3%
FY23 Q4 87.1%
FY24 Q1 59.7%
FY24 Q2 32.8%
FY24 Q3 40.2%
FY24 Q4 3.4%
FY25 Q1 -4.9%
FY25 Q2 7.2%
FY25 Q3 -4.9%
FY25 Q4 66.8%
FY26 Q1 69.3%
FY26 Q2 55.4%
FCF margin (TTM) White Mountains Insurance Group LTD
0% 10% 20% 30% 40% FY23 Q3 FY24 Q2 FY25 Q1 FY26 Q2 FCF margin (TTM), FY23 Q3: 32.2% FCF margin (TTM), FY23 Q4: 19.5% FCF margin (TTM), FY24 Q1: 16.3% FCF margin (TTM), FY24 Q2: 22.5% FCF margin (TTM), FY24 Q3: 21.5% FCF margin (TTM), FY24 Q4: 26.5% FCF margin (TTM), FY25 Q1: 23.7% FCF margin (TTM), FY25 Q2: 19.2% FCF margin (TTM), FY25 Q3: 22.4% FCF margin (TTM), FY25 Q4: 14.5% FCF margin (TTM), FY26 Q1: 16.6% FCF margin (TTM), FY26 Q2: 9.5% 9.5%

Source: SEC EDGAR filings. Retrieved October 20, 2026.

View chart data
Period FCF margin (TTM)
FY23 Q3 32.2%
FY23 Q4 19.5%
FY24 Q1 16.3%
FY24 Q2 22.5%
FY24 Q3 21.5%
FY24 Q4 26.5%
FY25 Q1 23.7%
FY25 Q2 19.2%
FY25 Q3 22.4%
FY25 Q4 14.5%
FY26 Q1 16.6%
FY26 Q2 9.5%

Data: SEC EDGAR XBRL company facts (as filed in 10-K/10-Q); forms 10-K, 10-K/A, 10-Q. Generated November 3, 2026. Definitions in our methodology.

Financial statements

US$ millions unless shown otherwise. Fiscal years, plus the last twelve months (LTM) when newer.

Fiscal year 2009 Dec 2009 2010 Dec 2010 2011 Dec 2011 2012 Dec 2012 2013 Dec 2013 2014 Dec 2014 2015 Dec 2015 2016 Dec 2016 2017 Dec 2017 2018 Dec 2018 2019 Dec 2019 2020 Dec 2020 2021 Dec 2021 2022 Dec 2022 2023 Dec 2023 2024 Dec 2024 2025 Dec 2025 LTM Jun 2026
Income
Revenue 3,443 2,334 2,173 2,436 1,362 1,411 440 158 374 369 893 896 614 1,158 2,167 2,240 3,735 3,830
Gross profit — — — — — — — 56 234 120 845 884 545 1,059 2,126 2,210 3,583 3,606
Net income 470 87 768 207 322 312 295 402 627 −141 415 709 −275 793 509 230 1,106 1,122
Diluted EPS $53.10 $10.12 $97.44 $30.50 $51.85 $51.13 $50.20 $80.06 $146.06 −$41.76 $130.27 $226.97 −$89.46 $276.96 $198.60 $89.79 $430.14 $452.84
Growth (year on year)
Revenue +16.9% −32.2% −6.9% +12.1% −44.1% +3.6% −68.8% −64.2% +137.0% −1.3% +142.0% +0.2% −31.4% +88.5% +87.1% +3.4% +66.8% +55.4%
Net income — −81.6% +787.7% −73.0% +55.1% −2.9% −5.4% +36.1% +56.1% −122.5% — +71.0% −138.9% — −35.8% −54.8% +380.2% +446.2%
Diluted EPS — −80.9% +862.8% −68.7% +70.0% −1.4% −1.8% +59.5% +82.4% −128.6% — +74.2% −139.4% — −28.3% −54.8% +379.1% +459.3%
Margins
Gross margin — — — — — — — 35.3% 62.7% 32.6% 94.6% 98.7% 88.7% 91.5% 98.1% 98.7% 95.9% 94.1%
Net margin 13.6% 3.7% 35.3% 8.5% 23.6% 22.1% 67.1% 254.8% 167.8% −38.3% 46.4% 79.1% −44.8% 68.5% 23.5% 10.3% 29.6% 29.3%
Cash flow
Cash from operations −47 56 −115 −226 −101 119 182 −155 95 −31 −121 −61 39 365 404 587 551 388
Stock-based pay — — — — — — — — — — — — 15 14 15 16 19 19
Balance sheet
Cash 120 104 252 119 234 146 78 80 97 110 161 85 148 255 122 266 186 128
Total debt 1,051 819 678 751 676 343 338 13 24 193 284 376 421 575 579 576 852 933
Net debt (negative = net cash) 931 715 426 632 443 197 260 −68 −73 82 123 292 273 320 457 309 667 805
Diluted shares 9m 8m 8m 7m 6m 6m 6m 5m 4m 3m 3m 3m 3m 3m 3m 3m 3m 2m
Returned to shareholders
Dividends 9 9 8 7 6 6 6 5 5 4 3 3 3 3 3 3 3 2
Buybacks 0 226 253 669 80 128 269 881 715 512 0 85 108 616 33 8 203 410
Total returned 9 234 261 676 86 134 275 887 719 516 3 88 111 619 35 10 205 412

Source: SEC EDGAR XBRL company facts (US and foreign periodic filings); column headings link to the filing. EBITDA is operating income plus depreciation and amortisation. Free cash flow is cash from operations minus capital spending. Growth is left blank when last year's figure was a loss or under 2% of revenue. Share counts and EPS are restated for stock splits. A dash means the company didn't report the figure.

Dividends, buybacks and capital spending

FY2026 Q2 TTM
Buybacks (TTM)
$410M
Dividends (TTM)
$2.4M
Returned to shareholders
113%
of free cash flow
Buybacks, last 3 fiscal years
$243M
Diluted share count
−2.3%
year over year
Total shareholder yield
7.5%
dividends 0.0% + buybacks 7.4% of market value
Dividend payout ratio
0%
of net income paid out

Competitors: side by side with peers

Closest by revenue in property & casualty insurance
Last 12 months unless stated WTM STC KMPR SIGI PLGO MCY Median
Revenue, last 12 months $3.8bn $3.3bn $4.6bn $5.4bn $2.5bn $6.3bn $1.7bn
Revenue growth, last 12 months 55.4% 22.5% −4.5% 4.0% 3.3% 10.0% 8.0%
Revenue growth, 3-year average 30.3% 10.1% −4.8% 10.1% — 14.3% 9.5%
Revenue growth, latest quarter 22.5% 24.5% −10.8% −2.5% — 13.8% 4.2%
Gross margin 94.1% — — — — 99.7% 72.1%
Net margin 29.3% 4.1% −10.8% 9.4% 9.0% 14.8% 10.5%
Cash from operations / revenue 10.1% 7.3% 9.5% 22.0% −16.3% 20.9% 18.2%
Free-cash-flow margin 9.5% 4.6% 8.7% 20.9% −16.4% 19.9% 17.6%
Free-cash-flow margin, 3-year average 17.1% 3.7% 6.3% 21.2% — 16.5% 16.5%
Stock pay / revenue 0.5% 0.6% 0.5% 0.4% 0.3% 0.0% 0.6%
Change in share count −2.3% 5.4% −7.7% −1.7% −7.7% 0.0% −0.7%

Median of all 48 companies we cover in property & casualty insurance. Shaded: best of the six on that line (lowest for stock pay and share-count growth). 3-year figures average the last three 12-month periods; 3-year growth is compound annual. Source: SEC filings.

Peer comparison

48 property & casualty insurance companies
Measure Company Peer median Rank
Revenue growth Growth 55.4% 8.3% 4 of 48
Change in growth rate Growth -13.9pp -0.7pp 46 of 48
Net margin Profitability 29.3% 10.8% 3 of 48
Stock pay as % of revenue Cash generation 0.5% 0.7% 10 of 34
Change in share count Balance sheet -2.3% -0.7% 12 of 47

Rank 1 = best in the group (for spending, debt and dilution, lower ranks first).

Where the revenue comes from

Fiscal year to December 31, 2025
Segments
Line of business Revenue YoY
Ark Insurance Holdings Limited WM Outrigger Re $1.9B ▲ 11.0%
Bamboo Insurance Services LLC $246M ▲ 37.0%
Kudu Investment Management LLC $183M ▲ 54.4%
HG Global BAM $73.6M —
Distinguished Partners $57.7M —

These categories overlap or exclude eliminations, so shares aren't shown.

From White Mountains Insurance Group LTD's 10-K filed February 27, 2026, as tagged in the filing. View filing. Indented rows are part of the line above; their share is of that line. In the bars, the faint bar behind is the year before.

Who owns it

Funds buying and selling
Reported value
$4.6B
Institutions reporting
354
Shares held vs prior quarter
▼ 0.3%
Positions opened / closed
33 / 41

Top buyers and sellers, Q2 2026: 129 institutions bought and 186 sold ; the biggest buyer was American Century Companies Inc (+23K shares) and the biggest seller Cooke & Bieler LP (−20K). See which funds bought and sold →

Largest reported holders, June 30, 2026
Manager Value Shares Share of 13F value Shares QoQ
Dimensional Fund Advisors LP $330M 159K 7.2% ▲ 1.5%
Neuberger Berman Group LLC $247M 119K 5.4% ▼ 4.5%
Blackrock, Inc. $244M 118K 5.4% ▲ 4.0%
River Road Asset Management, LLC $240M 116K 5.3% ▼ 3.8%
Vanguard Portfolio Management LLC $232M 112K 5.1% ▼ 3.1%
Vanguard Capital Management LLC $223M 107K 4.9% ▼ 1.5%
Fuller & Thaler Asset Management, Inc. $211M 102K 4.6% ▼ 2.6%
Cooke & Bieler LP $176M 85K 3.9% ▼ 18.8%
Wallace Capital Management Inc. $166M 80K 3.6% ▲ 1.6%
Fiduciary Management Inc $138M 67K 3.0% ▼ 21.8%
Gendell Jeffrey L $123M 59K 2.7% ▲ 56.7%
Boston Partners $115M 56K 2.5% ▼ 3.3%

From Form 13F filings with the SEC ( quarterly data sets), as reported by each manager for June 30, 2026 and filed up to 45 days later. 13F reports cover long US-listed positions of managers above $100M only, so this is not White Mountains Insurance Group LTD's complete shareholder register. Values are as reported by the filers .

Insider trading activity

Full insider history and chart
Insider purchases History → $0 0 trades by 0 insiders, last 12 months Insider sales History → $20.8M 4 trades by 3 insiders · 0% under pre-set plans
Net ▼ $20.8M net selling
Insider Date Trade Shares Price Value
Rountree George Manning Chief Executive Officer December 19, 2025 Sell 5,000 $2050.00 $10.3M
Campbell Reid Tarlton Director December 19, 2025 Sell 5,000 — $0
Campbell Reid Tarlton Director December 19, 2025 Sell 5,000 $2050.00 $10.3M
Gelston Philip A Director December 16, 2025 Sell 165 $2048.51 $338,004

From insiders' Form 4 filings with the SEC. Excludes awards, option exercises and shares withheld for tax. "Pre-set plan" means the filing marks the trade as made under a Rule 10b5-1 plan. See every insider trade since five years ago, on a price chart.

Trades by members of Congress

All 1 trade and filings

No trades in White Mountains Insurance Group LTD disclosed in the last 12 months; 1 earlier trade on record.

  • J. French Hill(R-AR 2):Purchase, $50,001 - $100,000, traded June 23, 2025, filed July 24, 2025

Value ranges as filed; reports can arrive up to 45 days after a trade.

Earnings dates and SEC filings

Results announcements

Next expected around November 5, 2026 estimated from the company's past filing pattern, not announced

  • August 6, 2026
  • May 6, 2026
  • February 6, 2026
  • November 6, 2025
  • August 7, 2025
  • May 7, 2025

Recent SEC filings

Data status

When each part of this page on White Mountains Insurance Group LTD was last updated.

DataLast updatedSource
Share priceExchange closing prices
Financial statementsSEC 10-K and 10-Q filings
News and updatesCompany releases and SEC 8-K filings
Analyst estimatesAggregated analyst estimates
Valuation and scoresOur models, from the filed figures

How we build and check these figures: methodology and data sources.

White Mountains Insurance Group LTD in brief

What does White Mountains Insurance Group LTD do?
White Mountains Insurance Group LTD is a US-listed company in the property & casualty insurance industry. Its financial year ends in December.
What is White Mountains Insurance Group LTD's stock ticker?
White Mountains Insurance Group LTD trades under the ticker WTM on NYSE. This page brings together its financial statements, valuation models, ownership and recent company updates.
What is White Mountains Insurance Group LTD's revenue, and how fast is it growing?
Over its most recent trailing twelve months, White Mountains Insurance Group LTD reported revenue of $3.8B, 55.4% higher than a year earlier, according to its SEC filings.
What is White Mountains Insurance Group LTD's free cash flow?
White Mountains Insurance Group LTD's free-cash-flow margin is 9.5% of revenue over the trailing twelve months.
Who are White Mountains Insurance Group LTD's largest institutional shareholders?
By value reported in 13F filings for June 30, 2026, the largest reported holders are Dimensional Fund Advisors LP, Neuberger Berman Group LLC and Blackrock, Inc. 13F reports cover long US-listed positions of managers above $100M, filed up to 45 days after quarter end.
Is White Mountains Insurance Group LTD buying back stock, and does it pay a dividend?
White Mountains Insurance Group LTD spent $410M on share repurchases over the trailing twelve months, and its diluted share count fell 2.3% over the year.
What is White Mountains Insurance Group LTD's market cap?
On November 2, 2026, White Mountains Insurance Group LTD's market capitalisation was about $5.7B, with a price-to-earnings ratio of 5.1 and net debt of $805M. Market figures come from third-party market data and may be delayed.
Does White Mountains Insurance Group LTD pay a dividend?
Yes: White Mountains Insurance Group LTD paid $2.4M in dividends over the trailing twelve months, a dividend yield of 0.04% and a payout ratio of 0.2%.
Who are White Mountains Insurance Group LTD's competitors?
In our Property & Casualty Insurance peer group, the companies closest to White Mountains Insurance Group LTD are Stewart Information Services Corp, Kemper Corp, Selective Insurance Group Inc, Pelagos Insurance Capital Ltd and Mercury General Corp. The side-by-side comparison below sets their revenue, margins and growth against White Mountains Insurance Group LTD's.
Are insiders buying or selling White Mountains Insurance Group LTD stock?
Over the last 12 months, White Mountains Insurance Group LTD's directors and officers reported 0 open-market purchases and 4 sales on Form 4. The insider trading page charts every trade.
When is White Mountains Insurance Group LTD's next earnings date?
Around November 5, 2026, estimated from the spacing of its past results announcements (8-K filings). That is an estimate, not a confirmed date — White Mountains Insurance Group LTD announces its own schedule.