TransAlta (TAC) Short Interest Ratio & Short Volume $10.48 +0.08 (+0.72%) Closing price 06/11/2025 03:58 PM EasternExtended Trading$10.47 0.00 (-0.05%) As of 04:00 AM 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 Short Interest Stock AnalysisAnalyst ForecastsChartCompetitorsDividendEarningsFinancialsHeadlinesOptions ChainOwnershipSEC FilingsShort InterestTrendsBuy This Stock TransAlta Short Interest DataTransAlta (TAC) has a short interest of 11.81 million shares, representing 4.01% of the float (the number of shares available for trading by the public). This marks a 7.66% increase in short interest from the previous month. The short interest ratio (days to cover) is 8.7, indicating that it would take 8.7 days of the average trading volume of 1.22 million shares to cover all short positions.Current Short Interest11,810,000 sharesPrevious Short Interest10,970,000 sharesChange Vs. Previous Month+7.66%Dollar Volume Sold Short$115.38 millionShort Interest Ratio8.7 Days to CoverLast Record DateMay 31, 2025Outstanding Shares296,450,000 sharesFloat Size294,610,000 sharesShort Percent of Float4.01%Today's Trading Volume2,333,506 sharesAverage Trading Volume1,222,916 sharesToday's Volume Vs. Average191% Short Selling TransAlta? Sign up to receive the latest short interest report for TransAlta and its competitors with MarketBeat's FREE newsletter. Email Address Skip Charts & View Short Interest HistoryShort Interest ChartDays to Cover ChartShort Percent of Float ChartTAC Short Interest Over TimeTAC Days to Cover Over TimeTAC Percentage of Float Shorted Over Time TransAlta Short Interest History Export to ExcelReport DateTotal Shares Sold ShortDollar Volume Sold ShortChange from Previous ReportPercentage of Float ShortedDays to CoverPrice on Report Date 5/31/202511,810,000 shares $115.38 million +7.7%4.0%8.7 $9.77 5/15/202510,970,000 shares $99.61 million -2.3%3.7%7.9 $9.08 4/30/202511,230,000 shares $99.95 million +2.8%3.8%6.9 $8.90 4/15/202510,920,000 shares $92.66 million -8.6%3.7%6.1 $8.49 3/31/202511,950,000 shares $111.67 million -6.6%4.1%6.2 $9.35 3/15/202512,800,000 shares $122.05 million -15.3%4.3%6.7 $9.54 2/28/202515,120,000 shares $156.42 million +50.6%5.1%7.8 $10.35 2/15/202510,040,000 shares $105.37 million +20.2%3.4%5.7 $10.50 1/31/20258,350,000 shares $96.07 million +13.5%2.8%5.5 $11.51 1/15/20257,360,000 shares $97.15 million -4.5%2.5%5.7 $13.20 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. 12/31/20247,710,000 shares $109.10 million +6.9%2.6%7.1 $14.15 12/15/20247,210,000 shares $96.54 million -4.1%2.4%7.2 $13.39 11/30/20247,520,000 shares $84.68 million +39.8%2.5%8.4 $11.26 11/15/20245,380,000 shares $55.20 million +39.0%1.8%6.9 $10.26 10/31/20243,870,000 shares $40.40 million +14.5%1.3%5.2 $10.44 10/15/20243,380,000 shares $34.70 million -19.1%1.1%4.5 $10.27 9/30/20244,180,000 shares $43.30 million -33.9%1.4%5.3 $10.36 9/15/20246,320,000 shares $57.64 million -26.0%2.1%8.8 $9.12 8/31/20248,540,000 shares $75.15 million +44.5%2.9%11.5 $8.80 8/15/20245,910,000 shares $50.38 million +2.4%2.0%7.8 $8.53 7/31/20245,770,000 shares $43.53 million +4.0%1.9%7.2 $7.55 7/15/20245,550,000 shares $40.13 million +4.1%1.8%7.1 $7.23 6/30/20245,330,000 shares $37.74 million +24.0%1.8%6.5 $7.08 6/15/20244,300,000 shares $29.89 million +8.6%1.4%5 $6.95 5/31/20243,960,000 shares $28.51 million +1.0%1.3%4.6 $7.20 5/15/20243,920,000 shares $28.03 million -18.2%1.3%4.5 $7.15 4/30/20244,790,000 shares $31.78 million +35.7%1.6%5.5 $6.64 4/15/20243,530,000 shares $21.52 million +11.4%1.2%4.5 $6.10 3/31/20243,170,000 shares $20.38 million -11.7%1.1%4.7 $6.43 3/15/20243,590,000 shares $22.60 million -0.8%1.2%5.7 $6.30 2/29/20243,620,000 shares $24.85 million -6.9%1.2%6.3 $6.87 2/15/20243,890,000 shares $27.11 million +6.6%1.3%7.1 $6.97 1/31/20243,650,000 shares $26.43 million +13.4%1.2%7.6 $7.24 1/15/20243,220,000 shares $24.99 million +0.3%1.1%6.9 $7.76 12/31/20233,210,000 shares $26.68 million +8.1%1.1%6.7 $8.31 12/15/20232,970,000 shares $23.85 million +0.7%1.0%5.5 $8.03 11/30/20232,950,000 shares $24.01 million +10.1%1.0%5.8 $8.14 11/15/20232,680,000 shares $22.70 million -11.3%0.9%5.4 $8.47 10/31/20233,020,000 shares $22.08 million -23.4%1.0%6.4 $7.31 10/15/20233,940,000 shares $32.51 million -24.2%1.4%8.6 $8.25Is Elon's empire crumbling? 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Click here to see the Tesla shock that could blindside everyone. 9/30/20235,200,000 shares $45.24 million -6.3%2.1%11.2 $8.70 9/15/20235,550,000 shares $51.81 million +27.0%2.3%14 $9.34 8/31/20234,370,000 shares $41.91 million +32.4%1.8%11.3 $9.59 8/15/20233,300,000 shares $33.30 million +22.7%1.3%8.9 $10.09 7/31/20232,690,000 shares $27.49 million +58.2%1.1%7.3 $10.22 7/15/20231,700,000 shares $16.83 million +97.9%0.7%5 $9.90 6/30/2023859,200 shares $8.04 million -25.9%0.4%2.8 $9.36 6/15/20231,160,000 shares $11.21 million +44.8%0.5%3.9 $9.66 5/31/2023800,900 shares $7.71 million -13.2%0.3%2.7 $9.63 5/15/2023922,900 shares $9.11 million -48.7%0.4%2.7 $9.87 4/30/20231,800,000 shares $16.06 million -10.5%0.7%5.3 $8.92 4/15/20232,010,000 shares $18.53 million -12.2%0.8%5.8 $9.22 3/31/20232,290,000 shares $20.04 million No Change0.9%6.6 $8.75 3/15/20232,290,000 shares $18.64 million +0.9%0.9%6.7 $8.14 2/28/20232,270,000 shares $18.36 million +4.1%0.9%6.5 $8.09 2/15/20232,180,000 shares $20.01 million +3.8%0.9%6.3 $9.18 1/31/20232,100,000 shares $20.43 million +3.5%0.8%5.9 $9.73 1/15/20232,030,000 shares $19.08 million +3.6%0.8%5.8 $9.40 12/30/20221,960,000 shares $17.58 million +27.3%0.8%5.3 $8.97 12/15/20221,540,000 shares $14.46 million -1.9%0.6%3.8 $9.39 11/30/20221,570,000 shares $14.68 million -6.0%0.6%3.9 $9.35 11/15/20221,670,000 shares $15.41 million -13.0%0.7%4 $9.23 10/31/20221,920,000 shares $16.93 million +15.7%0.8%4.6 $8.82 10/15/20221,660,000 shares $13.03 million -13.1%0.7%3.7 $7.85 9/30/20221,910,000 shares $16.87 million +27.3%0.8%4.6 $8.83 9/15/20221,500,000 shares $13.67 million +10.3%0.6%3.9 $9.11 8/31/20221,360,000 shares $12.76 million -3.6%0.5%3.4 $9.38 8/15/20221,410,000 shares $14.10 million +96.2%0.6%3.8 $10.00 7/31/2022718,600 shares $8.21 million -25.6%0.3%2 $11.42 7/15/2022965,500 shares $11.19 million +10.2%0.4%3 $11.59 6/30/2022876,300 shares $9.99 million +39.4%0.3%2.8 $11.40 6/15/2022628,800 shares $7.09 million +25.7%0.3%2.1 $11.27 5/31/2022500,400 shares $5.70 million -34.2%0.2%1.9 $11.39 5/15/2022760,900 shares $8.28 million -10.4%0.3%2.9 $10.88 4/30/2022849,200 shares $9.11 million +42.2%0.3%3.7 $10.73 4/15/2022597,300 shares $6.44 million -0.6%0.2%2.7 $10.78 3/31/2022600,600 shares $6.22 million +101.1%0.2%2.7 $10.36 3/15/2022298,700 shares $2.96 million +16.9%0.1%1.3 $9.92 2/28/2022255,600 shares $2.60 million -29.7%0.1%1.2 $10.17 2/15/2022363,700 shares $3.80 million -7.6%0.1%1.8 $10.45 1/31/2022393,600 shares $4.27 million -37.3%0.2%2 $10.86 1/15/2022627,700 shares $6.45 million +103.7%0.2%3.4 $10.27 12/31/2021308,200 shares $3.43 million -26.7%0.1%1.8 $11.12 12/15/2021420,300 shares $4.35 million +11.1%0.2%2.6 $10.35 11/30/2021378,200 shares $3.85 million +2.8%0.1%2.3 $10.17 11/15/2021367,800 shares $3.96 million +32.1%0.1%2.2 $10.76 10/29/2021278,500 shares $3.12 million +20.3%0.1%1.6 $11.22 10/15/2021231,600 shares $2.61 million -24.3%0.1%1.2 $11.25 9/30/2021306,000 shares $3.23 million +0.5%0.1%1.5 $10.56 9/15/2021304,500 shares $3.10 million -14.0%0.1%1.6 $10.17Is Elon's empire crumbling? (Ad)The Tesla Shock Nobody Sees Coming While headlines scream "Tesla is doomed"... Jeff Brown has uncovered a revolutionary AI breakthrough buried inside Tesla's labs. One that is helping AI escape from our computer screens and manifest itself here in the real world all while creating a 25,000% growth market explosion starting as early as July 23rd. Click here to see the Tesla shock that could blindside everyone. 8/31/2021354,000 shares $3.47 million +5.7%0.1%1.7 $9.80 8/13/2021335,000 shares $3.33 million No Change0.1%1.6 $9.95 7/15/2021336,600 shares $3.31 million +25.0%0.1%1.7 $9.83 6/30/2021269,300 shares $2.69 million -14.5%0.1%1.3 $9.98 6/15/2021315,000 shares $3.10 million -25.7%0.1%1.5 $9.85 5/28/2021423,700 shares $3.82 million -58.5%0.2%2 $9.02 5/14/20211,020,000 shares $9.39 million -15.7%0.4%4.3 $9.21 4/30/20211,210,000 shares $11.97 million -13.0%0.5%4.8 $9.89 4/15/20211,390,000 shares $13.77 million -2.8%0.5%5 $9.91 3/31/20211,430,000 shares $13.37 million -16.4%0.6%4.9 $9.35 3/15/20211,710,000 shares $15.37 million +17.9%0.7%5.6 $8.99 2/26/20211,450,000 shares $12.93 million -2.7%0.6%5.1 $8.92 2/12/20211,490,000 shares $13.87 million +38.0%0.6%5.9 $9.31 1/29/20211,080,000 shares $9.53 million -7.7%0.4%4.9 $8.82 1/15/20211,170,000 shares $10.11 million +47.8%0.4%5.8 $8.64 12/31/2020791,400 shares $6.00 million +163.3%0.3%4.4 $7.58 12/15/2020300,600 shares $2.11 million -15.4%0.1%1.9 $7.02 11/30/2020355,100 shares $2.46 million -56.2%0.1%2.8 $6.93 11/15/2020810,500 shares $5.18 million -14.0%0.3%6.4 $6.39 10/30/2020942,800 shares $5.74 million -1.9%0.4%7.1 $6.09 10/15/2020961,200 shares $6.22 million +9.4%0.4%7.1 $6.47 9/30/2020878,700 shares $5.40 million -7.8%N/A5.7 $6.15 9/15/2020952,700 shares $5.86 million -11.8%0.4%5.5 $6.15 8/31/20201,080,000 shares $6.96 million -1.8%0.4%5.6 $6.44 8/14/20201,100,000 shares $7.02 million +107.3%0.4%5 $6.38 7/31/2020530,600 shares $3.46 million -54.3%0.2%2.1 $6.52 7/15/20201,160,000 shares $7.17 million -0.9%0.4%3.8 $6.18 6/30/20201,170,000 shares $6.80 million +24.4%0.4%3.5 $5.81 6/15/2020940,500 shares $5.66 million +126.5%0.4%2.2 $6.02 TAC Short Interest - Frequently Asked Questions What is TransAlta's current short interest? Short interest is the volume of TransAlta shares that have been sold short but have not yet been closed out or covered. As of May 31st, traders have sold 11,810,000 shares of TAC short. 4.01% of TransAlta's shares are currently sold short. Learn More on TransAlta's current short interest. What is a good short interest ratio for TransAlta? The short interest ratio, also known as the "days to cover ratio", is calculated by dividing the number of shares of a stock sold short divided by its average trading volume. A short interest ratio ranging between 1 and 4 generally indicates strong positive sentiment about a stock and a lack of short sellers. A short interest ratio of 10 or greater indicates strong pessimism about a stock. TAC shares currently have a short interest ratio of 9.0. Learn More on TransAlta's short interest ratio. Which institutional investors are shorting TransAlta? As of the most recent reporting period, the following institutional investors, funds, and major shareholders have reported short positions of TransAlta: Jane Street Group LLC, K2 Principal Fund L.P., AYAL Capital Advisors Ltd, Simplex Trading LLC, National Bank of Canada FI, and Jefferies Financial Group Inc.. These positions are disclosed in Form 13F filings with the Securities and Exchange Commission. What is a good short interest percentage for TransAlta? Companies that have a short interest as a percentage of float below 10% indicates positive investor sentiment and few short sellers. Stocks with a short interest percentage above 10% is considered high, suggesting some investors are pessimistic about the stock. Companies with a short interest percentage of 20% or more indicates widespread negative sentiment. 4.01% of TransAlta's floating shares are currently sold short. Is TransAlta's short interest increasing or decreasing? TransAlta saw a increase in short interest in May. As of May 31st, there was short interest totaling 11,810,000 shares, an increase of 7.7% from the previous total of 10,970,000 shares. Changes in short volume can be used to identify positive and negative investor sentiment. Investors that short sell a stock are betting that its price will decline in the future. An increase in short sale volume suggests bearish (negative) sentiment among investors. A decrease on short sale volume suggests bullish (positive) sentiment. What is TransAlta's float size? TransAlta currently has issued a total of 296,450,000 shares. Some of TransAlta's outstanding shares are available for trading, while others are subject to various restrictions. The public float, also referred to as floating shares or "the float", are shares that publicly owned, unrestricted and available to trade on the open market. TransAlta currently has a public float of 294,610,000 shares. How does TransAlta's short interest compare to its competitors? 4.01% of TransAlta's shares are currently sold short. Here is how the short interest of companies in the industry of "utilities" compare to TransAlta: DT Midstream, Inc. (3.47%), Essential Utilities, Inc. (1.47%), Companhia Paranaense de Energia (0.00%), Oklo Inc. (12.05%), Brookfield Renewable Partners L.P. (0.46%), Kinetik Holdings Inc. (8.12%), EnLink Midstream, LLC (3.03%), Clearway Energy, Inc. (1.76%), Companhia Paranaense de Energia - COPEL (0.10%), Brookfield Infrastructure Co. (5.70%), Which stocks are the most shorted right now? As of the most recent reporting period, the following stocks had the largest short interest positions: SPDR S&P 500 ETF Trust ($64.96 billion), Invesco QQQ ($27.88 billion), iShares Russell 2000 ETF ($19.94 billion), iShares 20+ Year Treasury Bond ETF ($9.69 billion), Strategy Incorporated ($8.58 billion), SPDR S&P Biotech ETF ($5.72 billion), Invesco S&P 500 Equal Weight ETF ($5.45 billion), iShares iBoxx $ Investment Grade Corporate Bond ETF ($4.70 billion), Charter Communications, Inc. ($4.54 billion), and Industrial Select Sector SPDR Fund ($4.49 billion). View all of the most shorted stocks. What does it mean to sell short TransAlta stock? Short selling TAC is an investing strategy that aims to generate trading profit from TransAlta as its price is falling. TAC shares are trading up $0.08 today. To short a stock, an investor borrows shares, sells them and buys the shares back on the public market later to return it to the lender. Short sellers are betting that a stock will decline in price. If the stock does drop after selling, the short seller buys it back at a lower price and returns it to the lender. The difference between the sell price and the buy price is the trader's profit. How does a short squeeze work against TransAlta? A short squeeze for TransAlta occurs when it has a large amount of short interest and its stock appreciates in price. This forces short sellers to cover their short interest positions by buying actual shares of TAC, which in turn drives the price of the stock up even further. How often is TransAlta's short interest reported? Short interest is typically published by a stock exchange once per month. However, NASDAQ publishes a report for U.S. stocks, including TAC, twice per month. The most recent reporting period available is May, 31 2025. More Short Interest Resources from MarketBeat Related Companies DT Midstream Short Interest Data Essential Utilities Short Interest Data Companhia Paranaense de Energia Short Interest Data Oklo Short Interest Data Brookfield Renewable Partners Short Interest Data Kinetik Short Interest Data EnLink Midstream Short Interest Data Clearway Energy Short Interest Data Companhia Paranaense de Energia - COPEL Short Interest Data Brookfield Infrastructure Short Interest Data Short Interest Tools Stocks to Short Largest Short Interest Positions Short Interest Increases Short Interest Decreases Short Interest Reporting Dates This page (NYSE:TAC) was last updated on 6/12/2025 by MarketBeat.com Staff From Our PartnersNew Rule Hits in July — The Smart Money Already MovedA little-known regulation quietly goes into effect this July. 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