TransAlta (TAC) Stock Chart & Stock Price History $8.95 +0.08 (+0.90%) Closing price 03:59 PM EasternExtended Trading$8.95 0.00 (0.00%) As of 04:43 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 26.41%, with a year-to-date return of -36.75%. In the past month, the stock has increased 4.56%, reflecting recent market activity. As of the latest close, TransAlta traded at $8.88 with a market cap of $2.63 billion and volume of 815,936 shares. Five years ago, the stock traded at $5.61, representing a 59.54% increase over that period. At the time, it had a market cap of $1.54 billion and a volume of 229,700 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-1.65%1 Month Performance+4.56%3 Month Performance-17.70%Year-To-Date Performance-36.75%1 Year Performance+26.41%5 Year Performance+59.54% TAC Stock Chart for Thursday, May, 22, 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 Capitalization05/22/2025$8.88$8.95+0.85%$8.96$8.73703,489 shs$2.65 billion05/21/2025$9.15$8.88-3.01%$9.16$8.87815,936 shs$2.63 billion05/20/2025$8.97$9.15+2.01%$9.16$8.941.70 million shs$2.71 billion05/19/2025$9.10$8.97-1.43%$9.02$8.93712,710 shs$2.66 billion05/16/2025$9.08$9.10+0.22%$9.18$9.00824,842 shs$2.70 billion05/15/2025$8.98$9.08+1.11%$9.20$8.911.18 million shs$2.69 billion05/14/2025$9.14$8.98-1.75%$9.18$8.931.34 million shs$2.66 billion05/13/2025$8.90$9.14+2.75%$9.22$8.83689,917 shs$2.71 billion05/12/2025$8.67$8.90+2.60%$8.94$8.731.09 million shs$2.64 billion05/09/2025$8.53$8.67+1.68%$8.74$8.501.32 million shs$2.59 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. 05/08/2025$8.54$8.53-0.09%$8.67$8.34874,663 shs$2.54 billion05/07/2025$9.04$8.54-5.54%$9.34$8.423.13 million shs$2.54 billion05/06/2025$9.13$9.04-1.03%$9.14$8.96940,337 shs$2.69 billion05/05/2025$9.27$9.13-1.51%$9.24$9.06511,143 shs$2.72 billion05/02/2025$9.05$9.27+2.43%$9.30$9.05664,076 shs$2.76 billion05/01/2025$8.90$9.05+1.69%$9.15$8.96709,080 shs$2.70 billion04/30/2025$9.10$8.90-2.14%$9.02$8.85819,418 shs$2.65 billion04/29/2025$9.01$9.10+0.94%$9.12$8.89644,984 shs$2.71 billion04/28/2025$9.00$9.01+0.11%$9.07$8.911.14 million shs$2.69 billion04/25/2025$8.79$9.00+2.45%$9.04$8.701.49 million shs$2.68 billion04/24/2025$8.58$8.79+2.34%$8.83$8.60937,455 shs$2.62 billion04/23/2025$8.56$8.58+0.28%$8.88$8.55555,235 shs$2.56 billion04/22/2025$8.44$8.56+1.42%$8.65$8.461.17 million shs$2.55 billion04/21/2025$8.71$8.44-3.13%$8.69$8.35687,291 shs$2.52 billion Related Companies DT Midstream Stock Chart Companhia Paranaense de Energia Stock Chart Kinetik Stock Chart Brookfield Renewable Partners Stock Chart EnLink Midstream Stock Chart Clearway Energy Stock Chart Oklo Stock Chart TXNM Energy Stock Chart Enel Chile 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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