White Mountains stock reports Q3 loss after investment hit
Published on 11/10/2026 at 02:36 | Editorial responsibility: Rafael Müller, Editor-in-Chief AD HOC NEWSQuarterly Results And Investment Pressure
- White Mountains reported a third-quarter loss attributable to common shareholders after investment losses, while its insurance operations continued to produce solid underwriting results.
- Ark posted a 75% combined ratio, and the company agreed to sell 5.5 million MediaAlpha shares for 13.90 US dollars each.
White Mountains Insurance Group reported a third-quarter loss attributable to common shareholders on November 5, 2026, as investment losses offset solid operating results. The company's release said the loss was 39 million US dollars, compared with income of 114 million US dollars in the year-earlier quarter. The company release also reported book value per share of 2,243 US dollars as of September 30, 2026.
Investment Losses Weigh On Results
White Mountains said higher interest rates and a lower MediaAlpha share price drove unrealized investment losses. MediaAlpha generated a 54 million US dollar unrealized loss for the quarter, while the consolidated portfolio excluding MediaAlpha was flat.
Ark reported a 75% combined ratio for the quarter, compared with 76% a year earlier, and gross written premiums of 386 million US dollars. Ark also recorded an estimated 10 million US dollar loss related to the war in Iran, net of reinsurance and reinstatement premiums.
MediaAlpha Sale Changes Exposure
On November 4, White Mountains agreed to sell 5.5 million MediaAlpha shares for 13.90 US dollars per share. After the transaction, the company expects to hold 12.4 million shares, representing a 21% ownership interest based on the share count cited in the release.
White Mountains stock traded at 2,015 euros on Lang & Schwarz at 23:00 Berlin time on Monday, November 9, 2026.
White Mountains Business Model
White Mountains is a Bermuda-domiciled financial services holding company with operations spanning property and casualty insurance and reinsurance, asset management, financial guarantees, specialty insurance distribution, and services businesses. Its reported segments include Ark, Kudu, HG Global, Distinguished, WTM Partners, and other investment operations. The group combines insurance underwriting and distribution with asset management and corporate investment activities.
White Mountains Insurance Group Facts
- Company: White Mountains Insurance Group, Ltd.
- ISIN: BMG9618E1075
- Ticker: WTM
- Exchange: Lang & Schwarz
- Price: 2,015.00 euros on November 9, 2026 at 23:00 Berlin time
- Headquarters: Bermuda
The broader US market remains the relevant backdrop for Bermuda-domiciled White Mountains, with the S&P 500 market providing the main reference for US-listed financial stocks.
