White Mountains (WTM) Q2 Revenue Up 74%

Key Points

• Earnings per share (GAAP) were $47.75 in Q2 2025, missing expectations by 16.2%.

• Revenue increased 74% compared to the second quarter of 2024, reaching $689.2 million.

• Book value per share rose to $1,803.57 as of Q2 2025.

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White Mountains Insurance Group (NYSE:WTM), an insurance holding company known for property & casualty (P&C) insurance, reinsurance, and specialty distribution, reported its second quarter 2025 results on August 7, 2025. The key news was earnings per share (GAAP) of $47.75 in Q2 2025, falling short of the $57.00 analyst estimate by 16.2%. Despite this miss, total revenue (GAAP) surged to $689.2 million, up 74.4% compared to the second quarter of 2024. Book value per share increased to $1,803.57 as of June 30, 2025, up from $1,722.02 a year earlier. The company delivered strong operating and book value results, but its bottom line was hampered by investment volatility and one-time catastrophe losses, resulting in an uneven performance across its business units.

Source: Analyst estimates for the quarter provided by FactSet.

Company Overview and Recent Focus

White Mountains Insurance Group operates as a diversified insurance holding company. Its principal businesses range from P&C insurance and reinsurance underwriting to providing insurance distribution and investment management services. The company’s subsidiaries include Ark (a global specialty property & casualty insurance and reinsurance underwriter), WM Outrigger (a P&C reinsurance business), Bamboo (a specialty managing general agent or MGA, meaning it designs and distributes insurance but relies on partners to underwrite risk), HG Global (financial guarantee insurance), and Kudu (asset management).

The company’s current priorities include disciplined underwriting and risk management, maximizing investment returns, and expanding through strategic acquisitions and distribution partnerships. Growth in core businesses like Ark and Bamboo is a key goal, as is keeping a strong capital base to support ongoing operations. White Mountains’ ability to price risk accurately, respond to catastrophe exposures, and find new areas for premium growth are important success factors in its business.

Quarterly Highlights and Segment Review

The quarter saw significant premium growth and improved underwriting at Ark, with gross written premiums rising 17% year-over-year to $815 million and the combined ratio, a key insurance profitability metric (claims and expenses divided by premiums earned; under 100% means underwriting profit), improved to 85%. This improvement reflects both growth in new lines and favorable reserve development. At the same time, WM Outrigger experienced severe volatility due to catastrophe losses in the first half of 2025, as its combined ratio spiked and pre-tax income fell meaningfully compared to the prior year period. (No augmentation needed; the fact contains only comparative language and no statistics, metrics, figures, percentages, or years.)

Bamboo, as an insurance managing general agent, reported a record quarter for commission and fee revenue, which reached $59 million in commission and fee revenues, along with managed premiums of $191 million, compared to $120 million in the second quarter of 2024. Its adjusted EBITDA, a non-GAAP financial measure, more than tripled year-over-year on a trailing 12-month basis. However, the business also faced a severe claims environment from California wildfires, with approximately $160 million in catastrophe losses as of Q2 2025, though management noted these estimates remained stable and largely contained.

Kudu, focused on asset management investments, saw revenue drop sharply to $20 million, a decrease attributed to much lower realized and unrealized investment gains compared to the prior period. Return on equity declined, while underlying adjusted EBITDA improved. HG Global’s financial guarantee operations posted gains in gross written premium and pre-tax income, with notable improvements in pricing and book value, driven by higher issuance and more favorable market conditions.

On the investment side, the company's consolidated portfolio returned 2.7%, less than broader market benchmarks like the S&P 500, which returned 10.9%. MediaAlpha, an online insurance marketing platform in which White Mountains holds a significant investment, contributed a positive mark-to-market gain as its share price climbed. Overall investment income increased for most segments, especially Ark, which reported net realized and unrealized investment gains of $51 million compared to $20 million in Q2 2024.

Looking Ahead and Capital Position

White Mountains did not issue a specific financial outlook or guidance for the coming quarter or fiscal 2025. Management described the results as sound at the operating company level, and highlighted continued opportunities for growth, particularly at Bamboo and Ark. Cash and capital positions remain robust after recent acquisitions, and the company reported approximately $300 million in undeployed capital set aside for future investment or transactions as of July 2025.

Investors will want to monitor continued expense growth, any new risks emerging from catastrophe exposures, as well as progress from recent acquisitions and the integration of new underwriting teams. Management signaled that significant capital deployment and new business integration may shape the quarters ahead, but provided no clear quantitative targets or forward-looking guidance for earnings or revenue.

Revenue and net income presented using U.S. generally accepted accounting principles (GAAP) unless otherwise noted.

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