AltaGas (ATGFF) Stock Chart & Stock Price History $30.21 -0.02 (-0.05%) As of 08/15/2025 01:31 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 23.61%, with a year-to-date return of 29.48%. In the past month, the stock has increased 3.00%, reflecting recent market activity. As of the latest close, AltaGas traded at $30.21 with a market cap of and volume of 14,634 shares. Five years ago, the stock traded at $13.55, representing a 122.88% increase over that period. At the time, it had a market cap of and a volume of 2,734 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. Email Address 5 Day Performance-0.59%1 Month Performance+3.00%3 Month Performance+13.15%Year-To-Date Performance+29.48%1 Year Performance+23.61%5 Year Performance+122.88% ATGFF Stock Chart for Saturday, August, 16, 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 Capitalization08/15/2025$30.23$30.21-0.05%$30.23$30.2114,634 shs$0.0008/14/2025$30.24$30.23-0.05%$30.30$30.237,608 shs$0.0008/13/2025$30.21$30.24+0.09%$30.24$30.2417,931 shs$0.0008/12/2025$30.39$30.21-0.59%$30.36$30.2118,184 shs$0.0008/11/2025$30.11$30.39+0.93%$30.39$30.1282,544 shs$0.0008/08/2025$29.55$30.11+1.88%$30.11$30.113,271 shs$0.0008/07/2025$29.55$29.55+0.01%$29.55$29.5529,070 shs$0.0008/06/2025$29.55$29.55$30.33$29.4346,054 shs$0.0008/05/2025$31.29$29.55-5.56%$30.33$29.4346,054 shs$0.0008/04/2025$29.84$31.29+4.87%$31.29$27.32361 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. 08/01/2025$29.54$29.84+1.01%$29.88$29.339,754 shs$0.0007/31/2025$29.64$29.54-0.35%$29.81$29.5415,679 shs$0.0007/30/2025$29.52$29.64+0.42%$29.75$29.6415,889 shs$0.0007/29/2025$29.57$29.52-0.18%$29.59$29.526,364 shs$0.0007/28/2025$29.57$29.57$29.57$29.5715,686 shs$0.0007/25/2025$29.57$29.57$29.57$29.5717,822 shs$0.0007/24/2025$29.67$29.57-0.33%$29.57$29.5717,822 shs$0.0007/23/2025$29.48$29.67+0.65%$29.77$29.6717,358 shs$0.0007/22/2025$29.48$29.48$29.48$29.482,218 shs$0.0007/21/2025$29.80$29.48-1.08%$29.48$29.482,218 shs$0.0007/18/2025$29.79$29.80+0.03%$29.82$29.8030,000 shs$0.0007/17/2025$29.33$29.79+1.57%$29.79$29.19148,294 shs$0.0007/16/2025$29.27$29.33+0.20%$29.44$29.2175,870 shs$0.0007/15/2025$28.88$29.27+1.35%$29.28$29.03115,708 shs$0.00 Related Companies 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 CHKEZ 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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