White Mountains Insurance Group (WTM) Market Cap 1987–2026

As of November 11, 2026, White Mountains Insurance Group had a market cap of $5.394 billion, which decreased by 0.88% compared to the previous trading day. Market capitalization, often referred to as market cap, represents the total value of a company's outstanding shares on the stock market and is a common measure of its overall size and valuation.

Data updated: Nov 11, 2026, 4:00 PM ET
White Mountains Insurance Group logo

White Mountains Insurance Group Ltd. (WTM)

🌍 United States 📈 NYSE 🏭 Financial Services 🏢 Insurance
Latest Market Cap
$5.394B ▼ 0.88%
Start of 2026
$5.305B ▲ 1.68%
1 Year Ago
$4.915B ▲ 9.75%
All-Time High
$7.566B ▼ 28.71%


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Note: Each point on the chart represents the market capitalization at the end of the trading day.
Source: Data compiled from EDGAR filings, Bloomberg and Yahoo Finance.

📈 White Mountains Insurance Group Market Cap History by Year and Month

White Mountains Insurance Group Market Cap History by Year and Month
Year / MonthMarket Cap% Change
2026$5.394B▲ 1.68%
$5.394B▼ 0.44%
$5.418B▲ 13.13%
$4.789B▼ 4.54%
$5.017B▼ 3.43%
$5.195B▲ 1.17%
$5.135B▲ 0.41%
$5.114B▼ 7.49%
$5.528B▲ 1.99%
$5.42B▼ 1.56%
$5.506B▲ 5.46%
$5.221B▼ 1.58%
2025$5.305B▲ 6.21%
2024$4.995B▲ 29.64%
2023$3.853B▲ 5.75%
2022$3.643B▲ 19.06%
All market cap values reflect closing prices for the period shown.

📊 White Mountains Insurance Group Market Cap and Other Industry Peers

Below are selected companies for comparison based on industry, sub-industry, and sector:

  1. $29.13B
  2. $28.48B
  3. $24.17B
  4. $22.62B
  5. $15.9B
  6. $13.34B
  7. $13.06B
  8. $12.68B
  9. $11.83B
  10. $9.58B
  11. $9.23B
  12. $8.57B
  13. $7.81B
  14. $6.84B
  15. $6.3B
  16. $5.39B
  17. $3.24B
  18. $3.17B
  19. $2.05B
  20. $0.24B

Data reflect the most recent market capitalization values available.

Note: Market capitalization figures are based on available sources and may differ slightly from actual values, particularly for historical data.