TransAlta (TAC) Stock Chart & Stock Price History $12.62 +0.56 (+4.60%) Closing price 03:59 PM EasternExtended Trading$12.60 -0.02 (-0.16%) As of 06:12 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 AnalysisAnalyst ForecastsChartCompetitorsDividendEarningsFinancialsHeadlinesOptions ChainOwnershipSEC FilingsShort InterestTrendsBuy This Stock TransAlta Stock Price Performance The TransAlta (TAC) stock chart highlights key performance trends across multiple timeframes. Over the last 12 months, the stock's price has increased 42.90%, with a year-to-date return of -10.78%. In the past month, the stock has increased 3.57%, reflecting recent market activity. As of the latest close, TransAlta traded at $12.08 with a market cap of $3.58 billion and volume of 490,720 shares. Five years ago, the stock traded at $6.52, representing a 93.63% increase over that period. At the time, it had a market cap of $1.79 billion and a volume of 121,090 shares. Receive TAC Stock News and Ratings via EmailSign-up to receive the latest news and ratings for TransAlta and its competitors with MarketBeat's FREE daily newsletter. Subscribe Now View SMS TermsBy entering your phone number and clicking the sign-up button, you agree to receive periodic text messages from MarketBeat at the phone number you submitted, including texts that may be sent using an automatic telephone dialing system. Message and data rates may apply. Message frequency will vary. Messages will consist of stock alerts, news stories, and partner advertisements/offers. Consent is not a condition of the purchase of any goods or services. Text HELP for help/customer support. 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Read our full terms of service and privacy policy. 5 Day Performance+4.18%1 Month Performance+3.57%3 Month Performance+30.63%Year-To-Date Performance-10.78%1 Year Performance+42.90%5 Year Performance+93.63% TAC Stock Chart for Thursday, August, 28, 2025 TAC Chart by TradingView TransAlta 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 Capitalization08/28/2025$12.08$12.63+4.55%$12.66$12.08704,671 shs$3.74 billion08/27/2025$12.26$12.08-1.47%$12.27$12.02490,720 shs$3.58 billion08/26/2025$12.16$12.26+0.82%$12.27$12.05432,672 shs$3.63 billion08/25/2025$12.12$12.16+0.30%$12.20$11.97973,961 shs$3.60 billion08/22/2025$12.31$12.12-1.51%$12.39$12.082.75 million shs$3.59 billion08/21/2025$12.30$12.31+0.08%$12.54$12.28647,098 shs$3.65 billion08/20/2025$12.38$12.30-0.65%$12.43$12.14660,047 shs$3.64 billion08/19/2025$12.52$12.38-1.17%$12.54$12.33650,866 shs$3.67 billion08/18/2025$12.36$12.52+1.31%$12.61$12.31729,753 shs$3.71 billion08/15/2025$12.51$12.36-1.16%$12.62$12.33750,542 shs$3.66 billion Get the Latest News and Ratings for TAC and Related StocksEnter your email address below to receive the latest news and analysts' ratings for TransAlta and its competitors with MarketBeat's FREE daily newsletter. 08/14/2025$12.26$12.51+2.00%$12.63$12.121.28 million shs$3.71 billion08/13/2025$12.26$12.26+0.04%$12.36$12.15994,136 shs$3.63 billion08/12/2025$12.02$12.26+1.99%$12.30$12.00839,081 shs$3.63 billion08/11/2025$12.10$12.02-0.69%$12.11$11.974.40 million shs$3.56 billion08/08/2025$12.02$12.10+0.71%$12.19$11.941.03 million shs$3.59 billion08/07/2025$12.17$12.02-1.23%$12.19$11.88800,450 shs$3.56 billion08/06/2025$12.09$12.17+0.62%$12.25$11.941.07 million shs$3.61 billion08/05/2025$12.56$12.09-3.70%$12.57$12.011.70 million shs$3.58 billion08/04/2025$12.40$12.56+1.25%$12.57$12.25683,753 shs$3.72 billion08/01/2025$12.04$12.40+2.99%$12.66$11.861.47 million shs$3.68 billion07/31/2025$12.26$12.04-1.79%$12.33$11.951.18 million shs$3.57 billion07/30/2025$12.09$12.26+1.45%$12.49$12.081.25 million shs$3.63 billion07/29/2025$12.19$12.09-0.86%$12.33$12.021.23 million shs$3.58 billion07/28/2025$12.27$12.19-0.61%$12.31$11.981.38 million shs$3.61 billion Related Companies Essential Utilities Stock Chart Oklo Stock Chart DT Midstream Stock Chart Companhia Paranaense de Energia - Copel Stock Chart Brookfield Renewable Partners Stock Chart Kinetik Stock Chart Clearway Energy Stock Chart TXNM Energy Stock Chart Comp En De Mn Cemig ADS Stock Chart Companhia Paranaense de Energia (COPEL) Stock Chart Receive TAC Stock News and Ratings via EmailSign-up to receive the latest news and ratings for TransAlta and its competitors with MarketBeat's FREE daily newsletter. 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