White Mountains Insurance Group (WTM) is back in focus after its 2026 Annual Investor Presentation, which outlined 2025 results, growth in book value per share, record capital deployment, and several portfolio transactions.

The 1-year total shareholder return of 15.61% contrasts with a softer 90-day share price return, which fell 7.12%. This suggests momentum has cooled even as investors who stayed invested longer have seen stronger overall outcomes.

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With book value per share up 25% in 2025 and the stock showing a 1 year total return of 15.61%, yet weaker recent price action, is White Mountains still underappreciated, or are markets already pricing in its next leg of growth?

Preferred P/E of 4.9x: Is it justified?

On a P/E of 4.9x, White Mountains Insurance Group trades at a level that looks conservative compared to both the wider US market and the US insurance sector, even with the last close at $2,065.14.

P/E compares the current share price with earnings per share, so a lower P/E can indicate the market is putting a lower price on each dollar of earnings. For an insurance and capital solutions group reporting earnings growth over the past year that was very large and well ahead of its 25.2% per year 5 year average, a 4.9x multiple suggests the market is not assigning a premium to those recent results.

The contrast is clear when set against peers. White Mountains’ P/E of 4.9x sits well below the US insurance industry average of 10.9x and also below a peer average of 11.1x. This is a strong gap that points to investors paying far less for its earnings than for comparable companies. See what the numbers say about this price — find out in our valuation breakdown.

Result: Price-to-earnings of 4.9x (UNDERVALUED)

However, recent 90 day share price weakness and exposure to cyclical insurance and reinsurance markets could challenge the idea that the current P/E discount will persist.

Another view from the SWS DCF model

While the 4.9x P/E points to cheap earnings, the SWS DCF model tells a different story. With the stock at $2,065.14 versus an estimated future cash flow value of $1,433.66, this approach suggests the shares look expensive. Which signal do you weigh more heavily?

Simply Wall St performs a discounted cash flow (DCF) on every stock in the world every day (check out White Mountains Insurance Group for example). We show the entire calculation in full. You can track the result in your watchlist or portfolio and be alerted when this changes, or use our stock screener to discover 48 high quality undervalued stocks. If you save a screener we even alert you when new companies match - so you never miss a potential opportunity.

Next Steps

Mixed signals like these often split opinion, so it can help to move quickly and review the underlying data yourself before sentiment shifts again. To balance what is going well with what could pose risks, take a close look at the 2 key rewards and 1 important warning sign

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This article by Simply Wall St is general in nature. We provide commentary based on historical data and analyst forecasts only using an unbiased methodology and our articles are not intended to be financial advice. It does not constitute a recommendation to buy or sell any stock, and does not take account of your objectives, or your financial situation. We aim to bring you long-term focused analysis driven by fundamental data. Note that our analysis may not factor in the latest price-sensitive company announcements or qualitative material. Simply Wall St has no position in any stocks mentioned.