How has White Mountains Insurance Group's net investment income changed year-over-year?

White Mountains Insurance Group's net investment income increased by 19.8% year-over-year, from $59.6M to $71.4M.

What is the long-term trend for White Mountains Insurance Group's net investment income?

Over 4 years (2021 to 2025), White Mountains Insurance Group's net investment income has grown at a 31.7% compound annual growth rate (CAGR), from $82.5M to $248M.

White Mountains Insurance Group WTM Net Investment Income

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Segments

By segment

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P&C Insurance and Reinsurance (Ark/WM Outrigger)$28.7M+22.1%

Asset Management (Kudu)$20.8M+7.2%

Financial Guarantee (HG Global)$7.7M+22.2%

Specialty Insurance Distribution (Distinguished)$700K—

Other financials

Income statement

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Revenue$517.8M-10.4%

Gross profit$475.1M-16.7%

Net income-$27.2M-180%

Balance sheet

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Total debt$834.8M+23.5%

Total equity$5.4B+19.2%

Total assets$13.2B+19.7%

Cash flow

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Operating cash flow$30.5M+176%

Valuation

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Market cap$4.99B+9.8%

Profitability

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Gross margin94.9%-3.7pp

Net margin28.4%—

Returns & leverage

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Return on equity21.2%—

Debt / equity0.2×0.0×

Where this comes from

Reported directly by White Mountains Insurance Group in its filing.

Tagged under the XBRL concept us-gaap:NetInvestmentIncome.

The official record: White Mountains Insurance Group’s 10-Q, filed May 6, 2026, on SEC EDGAR. View the filing →

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Questions, answered.

What is White Mountains Insurance Group's net investment income?: White Mountains Insurance Group (WTM) reported net investment income of $71.4M in Q1 2026.
How has White Mountains Insurance Group's net investment income changed year-over-year?: White Mountains Insurance Group's net investment income increased by 19.8% year-over-year, from $59.6M to $71.4M.
What is the long-term trend for White Mountains Insurance Group's net investment income?: Over 4 years (2021 to 2025), White Mountains Insurance Group's net investment income has grown at a 31.7% compound annual growth rate (CAGR), from $82.5M to $248M.