8-K: White Mountains Reports Strong Q2 2025 Results

White Mountains Insurance Group, Ltd. reported a 3% increase in book value per share for Q2 2025, driven by sound operating company performance and good investment returns.

Summary

• Book value per share increased by 3% to $1,804 as of June 30, 2025, for both the second quarter and first six months of 2025, including dividends.
• Comprehensive income attributable to common shareholders was $124 million in Q2 2025, a significant improvement from $(55) million in Q2 2024.
• Ark/WM Outrigger's combined ratio improved to 84% in Q2 2025 from 87% in Q2 2024, and was 90% for H1 2025 compared to 89% for H1 2024.
• Ark reported gross written premiums of $815 million in Q2 2025, an increase of 17% year-over-year.
• HG Global generated $19 million in gross written premiums in Q2 2025, marking a record second quarter, and grew book value by 2%.
• Bamboo achieved a record quarter with managed premiums of $191 million in Q2 2025, up from $120 million in Q2 2024, and MGA adjusted EBITDA of $26 million in Q2 2025, up from $12 million in Q2 2024.
• MediaAlpha's share price increased 19% in Q2 2025, resulting in a $31 million mark-to-market gain for White Mountains.
• Excluding MediaAlpha, the investment portfolio was up 2.3% in Q2 2025.
• Undeployed capital stands at approximately $300 million following the recent acquisitions of Distinguished Programs and BroadStreet Partners.

Sentiment

Score: 7

Explanation: Overall positive performance with strong growth in key operating segments like Ark, HG Global, and Bamboo, contributing to a healthy increase in book value per share. However, Kudu's flat performance and the equity portfolio's underperformance relative to benchmarks, along with ongoing catastrophe losses, temper the overall positive sentiment.

Positives

• Book value per share increased 3% in Q2 2025 and H1 2025, reaching $1,804.
• Ark produced a strong 85% combined ratio for Q2 2025, an improvement over the prior year's 89%.
• Ark's gross written premiums grew 17% year-over-year in Q2 2025, supported by new underwriting teams and business classes.
• HG Global achieved a record second quarter with gross written premiums of $19 million, a 66% increase year-over-year.
• HG Global's total par value of policies assumed increased 18% year-over-year, and total gross pricing increased 39% year-over-year.
• Bamboo reported record financial performance, with trailing 12 months managed premiums increasing 72% to $613 million and trailing 12 months MGA adjusted EBITDA increasing threefold to $80 million.
• MediaAlpha's share price appreciation led to a $31 million mark-to-market gain in Q2 2025.
• The total consolidated portfolio return, excluding MediaAlpha, was a solid 2.3% in Q2 2025.
• Ark experienced net favorable prior year development in Q2 and H1 2025, primarily from property, marine & energy, and specialty lines.

Negatives

• Kudu reported 'flattish results' under volatile market conditions.
• Kudu's GAAP Return on Equity (ROE) dipped to 8% as of June 30, 2025, down from 13% as of March 31, 2025, due to lower net realized and unrealized investment gains.
• Ark's combined ratio in H1 2025 included 13 points of catastrophe losses, primarily from the January 2025 California wildfires.
• Ark's Q2 2025 combined ratio included six points of unfavorable development related to aviation losses from the conflict in Ukraine.
• WM Outrigger Re's combined ratio was 120% in H1 2025, a significant increase from 30% in H1 2024, largely due to $19 million in California wildfire losses.
• WM Outrigger Re's pre-tax income for H1 2025 was $0.3 million, a substantial decrease from $18 million in H1 2024.
• Bamboo's estimated losses from the January 2025 California wildfires remain unchanged at approximately $160 million as of June 30, 2025.
• The equity portfolio, excluding MediaAlpha, returned 3.4% in Q2 2025, trailing the S&P 500 Index return of 10.9%.

Risks

• Claims arising from catastrophic events, such as hurricanes, wildfires, and other severe weather.
• Recorded loss reserves subsequently proving to be inadequate.
• Fluctuations in the market value of the investment in MediaAlpha.
• Potential actions by rating agencies, including financial strength or credit ratings downgrades.
• The continued availability of capital and financing.
• The continued availability of fronting and reinsurance capacity.
• Deterioration of general economic, market, or business conditions.
• Competitive forces within the insurance industry.
• Changes in domestic or foreign laws or regulations, or their interpretation, applicable to the company, its competitors, or its customers.

Future Outlook

Kudu anticipates continued capital deployment through the remainder of 2025. Bamboo foresees ongoing opportunities to drive robust, profitable growth in the second half of 2025 and beyond.

Management Comments

• Manning Rountree, CEO: "BVPS was up 3% in the quarter. We had sound results at our operating companies and good investment returns."
• Ian Beaton, CEO of Ark: "We enjoyed good results for the first half of 2025. Ark's combined ratio was 85% for the second quarter and 90% year to date, both better than prior year. Gross written premiums in the quarter were up 17% year-over-year, aided by the addition of new underwriting teams and classes of business."
• Kevin Pearson, President of HG Global: "HG Global had a strong second quarter. Gross written premiums increased 66% year-over-year. Par value assumed increased 18% year-over-year, driven by higher issuance of municipal bonds, and total gross pricing increased 39% year-over-year, reflecting higher primary market pricing."
• Rob Jakacki, CEO of Kudu: "Kudu had an okay quarter. GAAP ROE dipped to 8%, reflecting lower realized and unrealized gains, while annualized adjusted EBITDA increased 1%, reflecting continued underlying growth. The fair value of our portfolio was flat, holding up well under volatile market conditions. Our pipeline remains active, and we anticipate continued capital deployment through the rest of 2025."
• John Chu, CEO of Bamboo: "Bamboo had an excellent quarter. We once again achieved record financial performance across our key financial metrics. Trailing 12 months managed premiums increased to $613 million, up 72% year-over-year, while trailing 12 months MGA adjusted EBITDA increased to $80 million, up 3x year-over-year. Looking ahead, we see continuing opportunities to drive robust, profitable growth in the second half of 2025 and beyond."
• Mark Plourde, President of White Mountains Advisors: "Excluding MediaAlpha, the total portfolio was up 2.3% in the quarter, a solid absolute result but mixed versus benchmarks. Our fixed income portfolio returned 1.5%, in-line with the Bloomberg Intermediate Aggregate Index return. The equity portfolio, excluding MediaAlpha, returned 3.4%, behind the S&P 500 Index return of 10.9% in a strong up quarter for common stocks. Equity results were driven by lower relative returns from our market neutral positions and other long-term investments."

Industry Context

The filing indicates strong performance in White Mountains' core insurance and distribution segments, particularly Ark, HG Global, and Bamboo, suggesting these businesses are effectively navigating market conditions or benefiting from strategic initiatives. The property and specialty insurance lines, as well as municipal bond insurance, appear to be areas of strength. While the overall investment portfolio delivered a solid absolute return, its underperformance relative to the S&P 500 highlights challenges in broader equity markets or specific investment strategies. The mention of catastrophe losses from California wildfires and the conflict in Ukraine underscores the ongoing impact of such events on the insurance industry.

Comparison to Industry Standards

• Ark's combined ratio of 85% for Q2 2025 is a strong indicator of underwriting profitability, generally outperforming many P&C insurance industry peers where combined ratios above 90% are common.
• The equity portfolio's 3.4% return (excluding MediaAlpha) in Q2 2025 significantly lagged the S&P 500 Index return of 10.9% for the same period, indicating underperformance against a major market benchmark.
• The fixed income portfolio's 1.5% return was in-line with the Bloomberg Intermediate Aggregate Index return, suggesting performance consistent with a relevant fixed income benchmark.

Stakeholder Impact

• Shareholders: Positive impact due to increased book value per share and strong financial performance in key operating segments.
• Customers: Implied positive impact from growth in managed premiums and new business volume at Bamboo, and the addition of new underwriting teams at Ark, potentially leading to broader service offerings.
• Employees: Potential positive impact from business growth and expansion, though non-cash equity-based compensation and restructuring expenses at Bamboo are noted.

Next Steps

• Kudu anticipates continued capital deployment through the rest of 2025.
• Bamboo sees continuing opportunities to drive robust, profitable growth in the second half of 2025 and beyond.
• White Mountains expects to file its Form 10-Q with the Securities and Exchange Commission on August 7, 2025.
• Shareholders are encouraged to refer to the Form 10-Q for more complete financial information.
• Readers are encouraged to review BAM's second quarter statutory financial statements and operating supplement on BAM's website.
• Readers are encouraged to review MediaAlpha's second quarter earnings release and related shareholder letter on MediaAlpha's investor relations website.

Key Dates

Recommendation

The company demonstrated strong operational performance across its core insurance and distribution segments (Ark, HG Global, Bamboo), leading to a healthy 3% increase in book value per share. While the investment portfolio underperformed the S&P 500, the underlying business growth and strategic capital deployment (recent acquisitions) indicate a robust outlook. The company is effectively managing catastrophe losses and expanding its market presence, suggesting continued value creation for shareholders.

Keywords

Insurance, Reinsurance, Financial Services, Asset Management, Property & Casualty, Specialty Insurance, Investment Group, SEC Filing, Earnings, Q2 2025, WTM, Ark, HG Global, Kudu, Bamboo, MediaAlpha