White Mountains Posts $39 Million Q3 Loss on Investment Reversal
White Mountains Insurance Group reported third-quarter results on November 5, 2026, posting a $39 million comprehensive loss attributable to common shareholders as investment results reversed from a year earlier. Book value per share was $2,243 at September 30, 2026, down 1% for the quarter but up 3% for the first nine months of 2026, including dividends. The result reversed $114 million of comprehensive income in the third quarter of 2025. Results included $69 million of net realized and…