Is White Mountains Insurance Group Ltd. overvalued or undervalued?

As of 28 November 2025, the valuation grade for White Mountains Insurance Group Ltd. has moved from very expensive to expensive, indicating a slight improvement in perceived value. The company appears to be overvalued based on its high P/E ratio of 49, an EV to EBITDA of 85.01, and a Price to Book Value of 1.04. In comparison, CNA Financial Corp. has a P/E of 14.82 and Unum Group has a P/E of 13.25, both of which suggest that White Mountains is trading at a significant premium relative to its peers.
Additionally, the company's recent stock performance shows a 1-year return of 0.53%, which is notably lower than the S&P 500's return of 14.18% over the same period, reinforcing the notion that the stock may be overvalued. Given these metrics and comparisons, White Mountains Insurance Group Ltd. is currently considered overvalued.