ATCO (ACO.X) Stock Chart & Stock Price History C$71.70 +0.74 (+1.04%) As of 05/22/2026 04:00 PM Eastern Add Compare Share Share Chart Stock AnalysisAnalyst ForecastsChartCompetitorsEarningsHeadlinesInsider TradesBuy This Stock ATCO Stock Price Performance The ATCO (ACO.X) stock chart highlights key performance trends across multiple timeframes. Over the last 12 months, the stock's price has increased 37.65%, with a year-to-date return of 27.17%. In the past month, the stock has increased 5.83%, reflecting recent market activity. As of the latest close, ATCO traded at C$71.70 with a market cap of C$7.24 billion and volume of 122,147 shares. Five years ago, the stock traded at C$43.76, representing a 63.85% increase over that period. At the time, it had a market cap of C$5.01 billion and a volume of 139,601 shares. Receive ACO.X Stock News and Ratings via EmailSign-up to receive the latest news and ratings for ATCO and its competitors with MarketBeat's FREE daily newsletter. 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Read our full terms of service and privacy policy. 5 Day Performance+3.70%1 Month Performance+5.83%3 Month Performance+11.20%Year-To-Date Performance+27.17%1 Year Performance+37.65%5 Year Performance+63.85% ACO.X Stock Chart for Saturday, May, 23, 2026 ACO.X Chart by TradingView ATCO 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 DateOpening PriceClosing PriceHighLowVolumeMarket Capitalization05/22/2026C$70.96C$71.70+1.04%C$71.78C$70.99122,147 shsC$7.24 billion05/21/2026C$70.41C$70.96+0.78%C$71.20C$70.41116,266 shsC$7.16 billion05/20/2026C$69.57C$70.41+1.21%C$70.88C$69.69269,068 shsC$7.11 billion05/19/2026C$69.14C$69.57+0.62%C$69.85C$68.92190,240 shsC$7.02 billion05/18/2026C$69.14C$69.14C$69.82C$68.53144,070 shsC$6.98 billion05/15/2026C$69.41C$69.14-0.39%C$69.82C$68.53144,070 shsC$6.98 billion05/14/2026C$68.69C$69.41+1.05%C$69.73C$68.29133,184 shsC$7.01 billion05/13/2026C$68.36C$68.69+0.48%C$68.97C$67.89126,970 shsC$6.94 billion05/12/2026C$68.88C$68.36-0.75%C$68.96C$68.28201,617 shsC$6.90 billion05/11/2026C$68.13C$68.88+1.10%C$69.16C$68.32179,493 shsC$6.95 billion Get the Latest News and Ratings for ACO.X and Related StocksEnter your email address below to receive the latest news and analysts' ratings for ATCO and its competitors with MarketBeat's FREE daily newsletter. 05/08/2026C$68.14C$68.13-0.01%C$68.49C$67.31263,519 shsC$6.88 billion05/07/2026C$67.82C$68.14+0.47%C$68.27C$67.14230,026 shsC$7.67 billion05/06/2026C$68.54C$67.82-1.05%C$69.38C$67.40219,899 shsC$7.63 billion05/05/2026N/AC$68.54C$69.20C$68.17156,808 shsC$7.71 billion04/30/2026C$68.59C$68.11-0.70%C$69.09C$67.99229,949 shsC$7.66 billion04/29/2026C$68.42C$68.59+0.25%C$68.93C$68.01168,640 shsC$7.72 billion04/28/2026C$67.91C$68.42+0.75%C$69.10C$68.30125,929 shsC$7.70 billion04/27/2026C$67.79C$67.91+0.18%C$68.18C$67.58117,017 shsC$7.64 billion04/24/2026C$67.75C$67.79+0.06%C$68.08C$67.33118,658 shsC$7.63 billion04/23/2026C$66.54C$67.75+1.82%C$68.10C$66.20168,608 shsC$7.62 billion04/22/2026C$66.83C$66.54-0.43%C$67.73C$66.22190,035 shsC$7.49 billion Related Companies BIP.UN Stock Chart CU Stock Chart ACO.Y Stock Chart EMA Stock Chart BEP.UN Stock Chart CPX Stock Chart BEPC Stock Chart BIPC Stock Chart AQN Stock Chart NPI Stock Chart Receive ACO.X Stock News and Ratings via EmailSign-up to receive the latest news and ratings for ATCO and its competitors with MarketBeat's FREE daily newsletter. This page (TSE:ACO.X) was last updated on 5/23/2026 by MarketBeat.com Staff. 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