White Mountains Insurance (WTM) stock price is $2,165.84, up 0.26% on the day, as of Oct 19, 2026. It has a market cap of $5.28Bn and a P/E ratio of 4.71, and is classified in the Property and Casualty Insurance industry (Financial Services sector).
Enterprise Value
Margins
P/FCF
Key Stats
Market Cap5.28 Bn
P/E4.71
P/S1.38
Div. Yield0.00
Total Debt (Qtr)932.50 Mn
Revenue Growth (1y) (Qtr)22.55
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About
White Mountains Insurance Group, Ltd. is an exempted Bermuda limited liability company that focuses on making opportunistic and value oriented acquisitions of businesses and assets in the insurance financial services and related sectors. The company operates these businesses through its subsidiaries and disposes of them when attractive exit valuations become available. As of December 31 2025 its primary activities included property and casualty insurance and reinsurance…
White Mountains Insurance Group, Ltd. is an exempted Bermuda limited liability company that focuses on making opportunistic and value oriented acquisitions of businesses and assets in the insurance financial services and related sectors. The company operates these businesses through its subsidiaries and disposes of them when attractive exit valuations become available. As of December 31 2025 its primary activities included property and casualty insurance and reinsurance municipal bond guarantee reinsurance capital solutions for asset and wealth management firms specialty insurance distribution and other operations.
White Mountains Insurance Group, Ltd. generates revenue primarily through earned premiums investment income and net realized and unrealized investment gains from its insurance and reinsurance subsidiaries. The company also earns fee revenues profit commissions and management fees from its capital solutions and specialty distribution businesses. Additionally it receives interest payments and distributions from its municipal bond guarantee reinsurance and other investment holdings.
The company operates through the following segments: Ark/WM Outrigger HG Global Kudu and Distinguished.
The Ark/WM Outrigger segment provides property and casualty insurance and reinsurance through its subsidiaries Ark and WM Outrigger Re offering niche lines such as property specialty marine & energy casualty and accident & health.
The HG Global segment provides municipal bond guarantee reinsurance through its subsidiary HG Re which offers first loss protection up to 15 percent of par outstanding for each policy assumed from Build America Mutual Assurance Company.
The Kudu segment supplies capital solutions for boutique asset and wealth management firms structuring investments as noncontrolling equity interests that generate immediate cash yields and support generational ownership transfers management buyouts acquisition growth and legacy partner liquidity.
The Distinguished segment operates as a full service MGA and program administrator for specialty property and casualty insurance placing insurance across programs grouped into ScaleCo and GrowthCo verticals earning commissions based on volume and profitability of the insurance it places.
White Mountains Insurance Group, Ltd. maintains a focused presence in specialty insurance and reinsurance competing with Lloyd's syndicates London market participants and Bermuda based insurers such as Arch Capital Group Ltd. and RenaissanceRe Holdings Ltd. In the municipal bond guarantee reinsurance arena HG Global faces competition primarily from Assured Guaranty Ltd. The company's capital solutions business Kudu serves boutique asset and wealth management firms alongside peers that provide similar private equity style financing. Distinguished operates in the highly competitive specialty insurance distribution market where rivals are differentiated by price service quality and technology.
The company serves a diverse customer base that includes insurance and reinsurance intermediaries such as Marsh & McLennan Companies Inc. Arthur J. Gallagher & Co Aon plc Howden Insurance Group and Willis Towers Watson plc municipal bond issuers like the Metropolitan Transportation Authority the City of Sherman TX the New Jersey Transportation Trust Fund Authority and the City of Chicago IL as well as boutique asset and wealth management firms and specialty insurance distribution partners.
Sector:Financial ServicesSector rationaleThe company's primary revenue is generated through earned premiums, investment income, and reinsurance activities via subsidiaries like Ark and HG Global, which fall under Property and Casualty Insurance and Reinsurance. Additionally, its Kudu segment provides capital solutions and equity investments for wealth management firms, further cementing its position within the Financial Services sector.Industries:+1 moreProperty and Casualty InsuranceProperty and Casualty InsurancePrimaryThe company generates primary revenue through earned premiums and investment income from its property and casualty insurance subsidiaries, such as Ark, which offers niche lines including property, specialty, marine, energy, and casualty.ReinsuranceReinsuranceSecondaryThe company operates reinsurance businesses, including WM Outrigger Re and HG Global, which provides municipal bond guarantee reinsurance to Build America Mutual Assurance Company.Insurance BrokersInsurance BrokersSecondaryThe Distinguished segment operates as a full-service MGA and program administrator for specialty P&C insurance, earning commissions based on the volume and profitability of the insurance it places.Classified using BQ-MICSCIK: 0000776867
Bull & bear
Investment Thesis
▲ Bull case
White Mountains Insurance Group (WTM) is positioned to benefit from the strong underlying performance of its core insurance operations, particularly Ark, which demonstrated improved underwriting discipline with a 91% combined ratio in Q1 FY26, down from 94% in Q1 FY25, driven by reduced catastrophe losses (seven points vs 25 points in the prior year) and continued net favorable prior year development (five points vs 14 points), indicating improving loss reserve adequacy and pricing power in specialty and property lines despite market softening, as noted by Ark's CEO who highlighted ongoing opportunities to drive profitable growth through new teams and classes of business.
The company's capital deployment strategy is generating tangible growth avenues beyond its traditional insurance segments, with WTM Partners having recently closed two acquisitions—BaseSix Systems LLC for ~$97 million and Hawkeye Electric LLC for ~$35 million—adding to the $125 million deployed into Bishop Street Underwriters in February, bringing total recent capital deployment to ~$257 million and reducing undeployed capital to ~$0.8 billion, which signals active execution of its private equity-style growth strategy in essential services and specialty industrial sectors, a segment that has historically delivered strong returns and diversification benefits.
Kudu, WTM's asset management arm, continues to exhibit resilience and scalability, delivering a 12% trailing 12-month return on equity as of March 31, 2026, supported by steady growth in its participation contract base to $1.35 billion and new deal origination, with CEO Rob Jakacki emphasizing disciplined investment amid volatility, while the recent minority investments in Drummond Capital Partners and Australian Financial Planning Group (AFPG) underscore Kudu's successful expansion into high-quality, institutional wealth management platforms managing over A$9.6 billion collectively, creating durable, fee-based income streams with low capital intensity and high retention.
HG Global's financial guarantee business showed meaningful progress, underwriting momentum, with gross written premiums growing 24% year-over-year to $8 million in Q1 FY26 and total par value of policies assumed rising 21% to $518 million, driven by increased primary and secondary market activity, while the fair value of BAM surplus notes increased to $346 million from $339 million due to accrued interest, reflecting stable underlying credit performance and growing demand for municipal bond insurance in a rising rate environment that supports better pricing and spread opportunities.
Despite the near-term drag from MediaAlpha's mark-to-market decline, WTM's investment portfolio ex-MediaAlpha returned 1.0% in Q1 FY26, outperforming benchmarks with the fixed income portfolio ahead of the Bloomberg Intermediate Aggregate Index (0.5% vs 0.1%) and the equity portfolio ahead of the S&P 500 (-4.3%) at 1.6%, demonstrating disciplined capital allocation and downside protection in volatile markets, a skill set that positions the company to capitalize on future market dislocations when MediaAlpha's sentiment recovers or is monetized.
White Mountains Insurance Group (WTM) is positioned to benefit from the strong underlying performance of its core insurance operations, particularly Ark, which demonstrated improved underwriting discipline with a 91% combined ratio in Q1 FY26, down from 94% in Q1 FY25, driven by reduced catastrophe losses (seven points vs 25 points in the prior year) and continued net favorable prior year development (five points vs 14 points), indicating improving loss reserve adequacy and pricing power in specialty and property lines despite market softening, as noted by Ark's CEO who highlighted ongoing opportunities to drive profitable growth through new teams and classes of business.
The company's capital deployment strategy is generating tangible growth avenues beyond its traditional insurance segments, with WTM Partners having recently closed two acquisitions—BaseSix Systems LLC for ~$97 million and Hawkeye Electric LLC for ~$35 million—adding to the $125 million deployed into Bishop Street Underwriters in February, bringing total recent capital deployment to ~$257 million and reducing undeployed capital to ~$0.8 billion, which signals active execution of its private equity-style growth strategy in essential services and specialty industrial sectors, a segment that has historically delivered strong returns and diversification benefits.
Kudu, WTM's asset management arm, continues to exhibit resilience and scalability, delivering a 12% trailing 12-month return on equity as of March 31, 2026, supported by steady growth in its participation contract base to $1.35 billion and new deal origination, with CEO Rob Jakacki emphasizing disciplined investment amid volatility, while the recent minority investments in Drummond Capital Partners and Australian Financial Planning Group (AFPG) underscore Kudu's successful expansion into high-quality, institutional wealth management platforms managing over A$9.6 billion collectively, creating durable, fee-based income streams with low capital intensity and high retention.
HG Global's financial guarantee business showed meaningful progress, underwriting momentum, with gross written premiums growing 24% year-over-year to $8 million in Q1 FY26 and total par value of policies assumed rising 21% to $518 million, driven by increased primary and secondary market activity, while the fair value of BAM surplus notes increased to $346 million from $339 million due to accrued interest, reflecting stable underlying credit performance and growing demand for municipal bond insurance in a rising rate environment that supports better pricing and spread opportunities.
Despite the near-term drag from MediaAlpha's mark-to-market decline, WTM's investment portfolio ex-MediaAlpha returned 1.0% in Q1 FY26, outperforming benchmarks with the fixed income portfolio ahead of the Bloomberg Intermediate Aggregate Index (0.5% vs 0.1%) and the equity portfolio ahead of the S&P 500 (-4.3%) at 1.6%, demonstrating disciplined capital allocation and downside protection in volatile markets, a skill set that positions the company to capitalize on future market dislocations when MediaAlpha's sentiment recovers or is monetized.
White Mountains Insurance Group (WTM) faces significant near-term headwinds from its volatile exposure to MediaAlpha, which accounted for $65 million of unrealized investment losses in Q1 FY26—nearly double the $37 million in Q1 FY25—and drove the majority of the $(27) million comprehensive loss attributable to common shareholders, with each $1.00 swing in MediaAlpha's share price impacting book value per share by approximately $7.00, making BVPS highly sensitive to sentiment-driven swings in a company that remains unprofitable and subject to cyclical digital advertising trends, a risk management did not adequately mitigate despite acknowledging the mark-to-market impact as the primary offset to solid operating results.
Ark's underwriting performance, while showing an improved combined ratio of 91%, remains exposed to escalating geopolitical risks, with the company disclosing $25 million in estimated net losses from the war in Iran in Q1 FY26—primarily in specialty and marine & energy lines—and explicitly warning that losses could increase as the conflict continues, a material and unquantifiable risk that was not stressed in forward-looking commentary and could erode underwriting profitability if the conflict expands or persists, especially given Ark's historical reliance on favorable prior year development, which declined from 14 points to five points year-over-year.
The growth trajectory of Distinguished, WTM's specialty insurance distribution platform, appears to be weakening, with ScaleCo adjusted EBITDA declining to $4 million in Q1 FY26 from $16 million in Q1 FY25, despite a 7% year-over-year increase in managed premiums, as management attributed the result to a "flattish quarter" where strong environmental program growth was offset by umbrella program declines amid continued market pressure, signaling potential challenges in sustaining profitability across its verticals and raising questions about the scalability of its inorganic de novo build strategy without proportional EBITDA conversion.
Kudu's return on equity declined to 12% on a trailing 12-month basis as of March 31, 2026, down from 13% at year-end 2025, due to lower net realized and unrealized investment gains, highlighting the segment's sensitivity to market performance and the limited scalability of its earnings model, which remains heavily dependent on investment returns rather than organic fee growth, a concern amplified by the fact that adjusted EBITDA grew only marginally from $16 million to $17 million year-over-year in Q1 FY26 despite increased deal activity, suggesting that new investments are not yet contributing meaningfully to current earnings.
HG Global's pre-tax income fell to $11 million in Q1 FY26 from $25 million in Q1 FY25, driven by a $(5) million swing in net realized and unrealized investment losses (vs $10 million gain in the prior year), revealing the segment's vulnerability to interest rate volatility and mark-to-market fluctuations in its BAM surplus note portfolio, a risk that was downplayed in management commentary despite being a core driver of earnings variability, and which could persist if monetary policy remains restrictive or if credit spreads widen in the municipal bond market.
White Mountains Insurance Group (WTM) faces significant near-term headwinds from its volatile exposure to MediaAlpha, which accounted for $65 million of unrealized investment losses in Q1 FY26—nearly double the $37 million in Q1 FY25—and drove the majority of the $(27) million comprehensive loss attributable to common shareholders, with each $1.00 swing in MediaAlpha's share price impacting book value per share by approximately $7.00, making BVPS highly sensitive to sentiment-driven swings in a company that remains unprofitable and subject to cyclical digital advertising trends, a risk management did not adequately mitigate despite acknowledging the mark-to-market impact as the primary offset to solid operating results.
Ark's underwriting performance, while showing an improved combined ratio of 91%, remains exposed to escalating geopolitical risks, with the company disclosing $25 million in estimated net losses from the war in Iran in Q1 FY26—primarily in specialty and marine & energy lines—and explicitly warning that losses could increase as the conflict continues, a material and unquantifiable risk that was not stressed in forward-looking commentary and could erode underwriting profitability if the conflict expands or persists, especially given Ark's historical reliance on favorable prior year development, which declined from 14 points to five points year-over-year.
The growth trajectory of Distinguished, WTM's specialty insurance distribution platform, appears to be weakening, with ScaleCo adjusted EBITDA declining to $4 million in Q1 FY26 from $16 million in Q1 FY25, despite a 7% year-over-year increase in managed premiums, as management attributed the result to a "flattish quarter" where strong environmental program growth was offset by umbrella program declines amid continued market pressure, signaling potential challenges in sustaining profitability across its verticals and raising questions about the scalability of its inorganic de novo build strategy without proportional EBITDA conversion.
Kudu's return on equity declined to 12% on a trailing 12-month basis as of March 31, 2026, down from 13% at year-end 2025, due to lower net realized and unrealized investment gains, highlighting the segment's sensitivity to market performance and the limited scalability of its earnings model, which remains heavily dependent on investment returns rather than organic fee growth, a concern amplified by the fact that adjusted EBITDA grew only marginally from $16 million to $17 million year-over-year in Q1 FY26 despite increased deal activity, suggesting that new investments are not yet contributing meaningfully to current earnings.
HG Global's pre-tax income fell to $11 million in Q1 FY26 from $25 million in Q1 FY25, driven by a $(5) million swing in net realized and unrealized investment losses (vs $10 million gain in the prior year), revealing the segment's vulnerability to interest rate volatility and mark-to-market fluctuations in its BAM surplus note portfolio, a risk that was downplayed in management commentary despite being a core driver of earnings variability, and which could persist if monetary policy remains restrictive or if credit spreads widen in the municipal bond market.