White Mountains Insurance Group (WTM) Stock Chart & Stock Price History $1,834.75 +21.66 (+1.19%) Closing price 08/20/2025 03:59 PM EasternExtended Trading$1,836.63 +1.88 (+0.10%) As of 08/20/2025 04:29 PM Eastern Extended trading is trading that happens on electronic markets outside of regular trading hours. This is a fair market value extended hours price provided by Polygon.io. Learn more. Add Compare Share Share Chart Stock AnalysisChartCompetitorsDividendEarningsFinancialsHeadlinesInsider TradesOwnershipSEC FilingsShort InterestSustainabilityTrendsBuy This Stock White Mountains Insurance Group Stock Price Performance The White Mountains Insurance Group (WTM) stock chart highlights key performance trends across multiple timeframes. Over the last 12 months, the stock's price has increased 0.97%, with a year-to-date return of -5.67%. In the past month, the stock has increased 3.19%, reflecting recent market activity. As of the latest close, White Mountains Insurance Group traded at $1,834.75 with a market cap of $4.73 billion and volume of 26,023 shares. Five years ago, the stock traded at $877.07, representing a 109.19% increase over that period. At the time, it had a market cap of $2.77 billion and a volume of 6,105 shares. Receive WTM Stock News and Ratings via EmailSign-up to receive the latest news and ratings for White Mountains Insurance Group and its competitors with MarketBeat's FREE daily newsletter. Email Address 5 Day Performance+3.92%1 Month Performance+3.19%3 Month Performance-0.18%Year-To-Date Performance-5.67%1 Year Performance+0.97%5 Year Performance+109.19% WTM Stock Chart for Thursday, August, 21, 2025 WTM Chart by TradingView White Mountains Insurance Group Stock Price History Daily Weekly Monthly Yearly Time Frame Custom Range 1 Month 3 Months 6 Months Year-to-Date 1 Year 3 Year 5 Year Time Frame Start Date End Date Export to Excel DateOpening PriceClosing PriceHighLowVolumeMarket Capitalization08/20/2025$1,812.81$1,834.75+1.21%$1,841.21$1,809.0026,023 shs$4.73 billion08/19/2025$1,763.87$1,812.81+2.77%$1,813.53$1,777.3828,565 shs$4.67 billion08/18/2025$1,765.61$1,763.87-0.10%$1,779.02$1,758.6832,776 shs$4.55 billion08/15/2025$1,845.96$1,765.61-4.35%$1,848.31$1,762.7141,911 shs$4.56 billion08/14/2025$1,870.64$1,845.96-1.32%$1,867.47$1,840.0030,109 shs$4.76 billion08/13/2025$1,825.62$1,870.64+2.47%$1,880.11$1,819.0021,933 shs$4.82 billion08/12/2025$1,788.09$1,825.62+2.10%$1,828.03$1,779.0029,558 shs$4.71 billion08/11/2025$1,757.00$1,788.09+1.77%$1,791.18$1,744.0037,429 shs$4.61 billion08/08/2025$1,753.74$1,757.00+0.19%$1,789.00$1,750.2124,358 shs$4.52 billion08/07/2025$1,785.43$1,753.74-1.77%$1,776.92$1,747.6049,066 shs$4.51 billion Get the Latest News and Ratings for WTM and Related StocksEnter your email address below to receive the latest news and analysts' ratings for White Mountains Insurance Group and its competitors with MarketBeat's FREE daily newsletter. 08/06/2025$1,785.15$1,785.43+0.02%$1,795.47$1,756.0032,014 shs$4.59 billion08/05/2025$1,778.20$1,785.15+0.39%$1,788.30$1,777.2421,222 shs$4.59 billion08/04/2025$1,772.35$1,778.20+0.33%$1,790.00$1,774.1522,713 shs$4.57 billion08/01/2025$1,783.49$1,772.35-0.62%$1,779.93$1,762.0016,873 shs$4.55 billion07/31/2025$1,785.50$1,783.49-0.11%$1,796.80$1,780.5716,118 shs$4.59 billion07/30/2025$1,791.25$1,785.50-0.32%$1,801.00$1,773.2015,464 shs$4.59 billion07/29/2025$1,788.15$1,791.25+0.17%$1,796.90$1,785.5312,058 shs$4.60 billion07/28/2025$1,787.19$1,788.15+0.05%$1,789.56$1,780.0013,667 shs$4.60 billion07/25/2025$1,780.68$1,787.19+0.37%$1,794.00$1,782.9412,086 shs$4.60 billion07/24/2025$1,784.25$1,780.68-0.20%$1,785.39$1,777.8815,685 shs$4.58 billion07/23/2025$1,792.20$1,784.25-0.44%$1,789.10$1,780.5213,871 shs$4.59 billion07/22/2025$1,778.09$1,792.20+0.79%$1,799.44$1,770.5021,041 shs$4.61 billion07/21/2025$1,811.30$1,778.09-1.83%$1,820.00$1,776.2116,789 shs$4.57 billion Related Companies Erie Indemnity Stock Chart Fidelity National Financial Stock Chart CNA Financial Stock Chart Old Republic International Stock Chart Axis Capital Stock Chart First American Financial Stock Chart RLI Stock Chart The Hanover Insurance Group Stock Chart Selective Insurance Group Stock Chart Assured Guaranty Stock Chart Receive WTM Stock News and Ratings via EmailSign-up to receive the latest news and ratings for White Mountains Insurance Group and its competitors with MarketBeat's FREE daily newsletter. 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