TransAlta (TAC) Stock Chart & Stock Price History $12.30 -0.01 (-0.04%) Closing price 03:59 PM EasternExtended Trading$12.30 0.00 (0.00%) As of 05:44 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 44.85%, with a year-to-date return of -13.04%. In the past month, the stock has increased 0.49%, reflecting recent market activity. As of the latest close, TransAlta traded at $12.30 with a market cap of $3.64 billion and volume of 660,047 shares. Five years ago, the stock traded at $6.45, representing a 90.78% increase over that period. At the time, it had a market cap of $1.76 billion and a volume of 290,446 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. Email Address 5 Day Performance-0.44%1 Month Performance+0.49%3 Month Performance+38.65%Year-To-Date Performance-13.04%1 Year Performance+44.85%5 Year Performance+90.78% TAC Stock Chart for Thursday, August, 21, 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 Capitalization08/21/2025$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 billion08/14/2025$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 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. 08/07/2025$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 billion07/25/2025$12.33$12.27-0.49%$12.31$12.15579,722 shs$3.64 billion07/24/2025$12.58$12.33-2.06%$12.68$12.281.03 million shs$3.65 billion07/23/2025$12.26$12.58+2.61%$12.70$12.35885,384 shs$3.73 billion07/22/2025$12.25$12.26+0.16%$12.29$11.99676,445 shs$3.64 billion07/21/2025$12.35$12.25-0.85%$12.40$12.021.42 million shs$3.63 billion Related Companies Essential Utilities Stock Chart DT Midstream Stock Chart Oklo 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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