White Mountains Insurance reports strong Q2 2026 growth

White Mountains Insurance Group, Ltd. reported strong second-quarter 2026 financial results, characterized by growth in book value and net income. As of June 30, 2026, the book value per share reached $2,258, representing a 4% increase from the previous quarter and a 3% increase year-to-date including dividends.

Net income attributable to common shareholders rose significantly to $199.5 million in Q2 2026, compared to $122.9 million in Q2 2025. Diluted earnings per share also saw a substantial increase, rising to $80.58 from $47.75 in the prior-year period.

The company's performance was driven by several segments. The Ark segment reported an 84% combined ratio, indicating profitable underwriting. Earned insurance premiums in the property and casualty insurance and reinsurance segment grew to $376.2 million, up from $364.2 million in Q2 2025. Additionally, the specialty asset-management platform Kudu generated a 15% trailing twelve-month return on equity. The results were also bolstered by mark-to-market gains from MediaAlpha within the Other Operations segment.