AltaGas (ATGFF) Stock Chart & Stock Price History $30.26 +0.49 (+1.65%) As of 01:51 PM Eastern Add Compare Share Share Chart Stock AnalysisAnalyst ForecastsChartHeadlinesSEC FilingsShort InterestBuy This Stock AltaGas Stock Price Performance The AltaGas (ATGFF) stock chart highlights key performance trends across multiple timeframes. Over the last 12 months, the stock's price has increased 17.97%, with a year-to-date return of 29.69%. In the past month, the stock has increased 1.20%, reflecting recent market activity. As of the latest close, AltaGas traded at $29.77 with a market cap of and volume of 22,072 shares. Five years ago, the stock traded at $12.47, representing a 142.65% increase over that period. At the time, it had a market cap of and a volume of 3,966 shares. Receive ATGFF Stock News and Ratings via EmailSign-up to receive the latest news and ratings for AltaGas 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-0.56%1 Month Performance+1.20%3 Month Performance+1.58%Year-To-Date Performance+29.69%1 Year Performance+17.97%5 Year Performance+142.65% ATGFF Stock Chart for Friday, October, 17, 2025 ATGFF Chart by TradingView AltaGas 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 Capitalization10/16/2025$30.19$29.77-1.39%$30.11$29.7722,072 shs$0.0010/15/2025$30.19$30.19$30.20$30.185,033 shs$0.0010/14/2025$30.43$30.19-0.79%$30.20$30.185,033 shs$0.0010/13/2025$30.43$30.43$30.45$30.4134,361 shs$0.0010/10/2025$30.10$30.43+1.10%$30.45$30.4134,361 shs$0.0010/09/2025$30.47$30.10-1.21%$30.53$30.1012,017 shs$0.0010/08/2025$30.53$30.47-0.20%$30.51$30.4032,170 shs$0.0010/07/2025$30.93$30.53-1.28%$30.53$30.5016,583 shs$0.0010/06/2025$31.07$30.93-0.46%$31.08$30.931,744 shs$0.0010/03/2025$31.11$31.07-0.13%$31.34$31.0633,568 shs$0.00 Get the Latest News and Ratings for ATGFF and Related StocksEnter your email address below to receive the latest news and analysts' ratings for AltaGas and its competitors with MarketBeat's FREE daily newsletter. 10/02/2025$30.96$31.11+0.48%$31.11$31.1114,071 shs$0.0010/01/2025$30.90$30.96+0.19%$30.96$30.8710,569 shs$0.0009/30/2025$30.70$30.90+0.65%$30.95$30.7980,115 shs$0.0009/29/2025$30.74$30.70-0.13%$30.81$30.7020,249 shs$0.0009/26/2025$31.19$30.74-1.44%$30.85$29.679,770 shs$0.0009/25/2025$30.81$31.19+1.23%$31.24$31.1921,908 shs$0.0009/24/2025$30.81$30.81$30.81$30.8153,152 shs$0.0009/23/2025$30.81$30.81$30.89$30.7127,532 shs$0.0009/22/2025$30.88$30.81-0.23%$30.89$30.7127,532 shs$0.0009/19/2025$30.12$30.88+2.53%$31.03$30.77486,184 shs$0.0009/18/2025$29.90$30.12+0.73%$30.18$30.0720,128 shs$0.0009/17/2025$29.82$29.90+0.27%$29.90$29.9031,985 shs$0.0009/16/2025$30.46$29.82-2.10%$30.22$29.8223,353 shs$0.00 Related Companies ALOD Stock Price Chart AMIH Stock Price Chart ARHVF Stock Price Chart AKVA Stock Price Chart BKRP Stock Price Chart BPIGF Stock Price Chart BNXR Stock Price Chart CDVIQ Stock Price Chart CRBO Stock Price Chart CYPE Stock Price Chart Receive ATGFF Stock News and Ratings via EmailSign-up to receive the latest news and ratings for AltaGas and its competitors with MarketBeat's FREE daily newsletter. 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