White Mountains swings to Q3 loss as investment results sink

what happened

White Mountains posted weaker third-quarter 2026 results, with revenue down 25.8% to $641.1 million from $864.2 million a year earlier. The company moved to a net loss of $39 million, compared with net income of $113.8 million in the prior-year period, and diluted loss per share came in at $17.71 against earnings of $44.18. According to TradingView's AI-generated summary of the company's 10-Q filing with the SEC, the main drag was investment losses, driven by higher interest rates and a slide in the share price of MediaAlpha.

The operating businesses performed better. Ark's combined ratio stood at 75%, including two points of catastrophe losses from the Iran conflict and a four-point benefit from releasing reserves set aside for earlier years. Ark's gross written premiums grew 5%. Distinguished's managed premiums rose 20%, and WTM Partners lifted both revenue and adjusted EBITDA on organic growth and the Basesix and Hawkeye Electric acquisitions.

why it matters

The picture is mixed: losses on the investment portfolio, shaped by higher rates and a weaker MediaAlpha stake, pulled down the bottom line, while the insurance and services units kept growing. Investors will be watching how quickly the investment side returns to profit and how long the catastrophe costs linked to the Iran conflict weigh on results.

market impact

WTM shares: the net loss and lower revenue weigh on the company's results, partly offset by steadier operating units

• ▼White Mountains shares pressure down — the net loss and falling revenue weaken the company's reported results

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