White Mountains Insurance Group Ltd. (WTM)

NYSE: WTM · Fire, Marine & Casualty Insurance · Hanover, NH · filing with the SEC since 1994

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Grade6.3

◀ Past 6.6● Present 6.4▶ Future 5.9

Overview Business Financials Grade Forecast Sentiment Ownership People Filings Patents Chart

The companyfiscal 2025, as filed

Revenue$3.73B+66.8%

Net income$1.20B+323.0%

Earnings per share$430.14+379.1%

Operating cash flow$551M-6.2%

Cash$186M-30.3%

Debt$837M+48.8%

Shareholders’ equity$5.43B+21.0%

Shares, diluted2,534,300+0.1%

Return on equity22.1%

The recordfrom its filings

Filings in 202657

Newest filingNov 12 · 13F-HR

Annual reportFeb 27, 2026

Quarterly reportNov 5, 2026

Next report due10-K by Mar 1

Insider sales, 12 months$20.8M

Insider buys, 12 months$0.00

Patents granted1

Filer categoryLarge accelerated filer

Trailing twelve months to Sep 2026Revenue $3.61BNet income $989MCash from operations $386Mthe four newest filed quarters added

Left: the newest annual report, with the change on the year before. Right: counted from the company's own filings with the SEC.

Revenue and net income by fiscal yearRevenueNet income

16171819202122232425

As filed, in USD. Nothing here is a forecast.

News

Nov 12, 2026 · SEC EDGAR · Form 13F-HR

Holdings report, as a money manager

Open the filing on sec.gov

Nov 5, 2026 · SEC EDGAR · Form 10-Q

Quarterly report

Open the filing on sec.gov

Nov 5, 2026 · SEC EDGAR · Form 8-K

Results released

Open the filing on sec.gov

Nov 5, 2026 · SEC EDGAR · Form SCHEDULE 13D/A

Activist holder update, amended

Open the filing on sec.gov

Nov 5, 2026 · SEC EDGAR · Form 4

Insider trade report

Open the filing on sec.gov

Oct 30, 2026 · SEC EDGAR · Form SCHEDULE 13D/A

Activist holder update, amended

Open the filing on sec.gov

Aug 31, 2026 · SEC EDGAR · Form 4

Insider trade report

Open the filing on sec.gov

Aug 27, 2026 · SEC EDGAR · Form 8-K

Current report

Open the filing on sec.gov

Aug 27, 2026 · SEC EDGAR · Form 4

Insider trade report

Open the filing on sec.gov

Aug 27, 2026 · SEC EDGAR · Form 3

Insider holding, initial

Open the filing on sec.gov

An outside story is shown by its headline, its source and its link only. The SI reads the page when you ask it to break one down.

SI brieffrom the record

Core business

White Mountains Insurance Group Ltd. is classed by the SEC under Fire, Marine & Casualty Insurance (industry code 6331), based in Hanover, NH.

Newest on the record

Holdings report, as a money manager on Nov 12. Before it, quarterly report on Nov 5.

What is due next

The 10-K for the period to Dec 31, 2026, due by Mar 1, 2027.

About WTM

White Mountains Insurance Group Ltd. is classed by the SEC under Fire, Marine & Casualty Insurance (industry code 6331), based in Hanover, NH. In its latest annual figures on file, for the fiscal year ended 2025-12-31, it reported revenue of $3.7 billion and a profit of $1.2 billion (its filed statements).

IndustryFire, Marine & Casualty Insurance

HeadquartersHanover, NH

Business modelInsurance business

ExchangeNYSE

Filing since1994

Fiscal year endsDec 31

SEC number (CIK)776867

Peers on filePLGO, KMPR, SPNT, SIGI

Who runs it

Financial performance

In fiscal 2025 White Mountains Insurance Group’s revenue was $3.73 billion, up 66.8% from $2.24 billion the year before. Net income was $1.20 billion, up 323.0%.

Annual report, filed Feb 27, 2026.

Financial statements

The grade

White Mountains Insurance Group grades 6.3 of 10 against its own industry, the 60 companies in Fire, Marine & Casualty Insurance. All nine metrics are read as filed.

◀ Past6.6

● Present6.4

▶ Future5.9

How the grade is made

Forecast

Every forecast is registered before the outcome, with the rule that settles it. A miss stays on the page.

Company forecasts

SI Assistanton WTM · research, not advice