Atara Biotherapeutics (ATRA) Short Interest Ratio & Short Volume $7.72 -0.24 (-3.02%) As of 04:00 PM Eastern Add Compare Share Share Short Interest Stock AnalysisAnalyst ForecastsChartCompetitorsEarningsHeadlinesInsider TradesOptions ChainOwnershipSEC FilingsShort InterestSustainabilityTrendsBuy This Stock Atara Biotherapeutics Short Interest DataAtara Biotherapeutics (ATRA) has a short interest of 285,800 shares, representing 8.63% of the float (the number of shares available for trading by the public). This marks a -22.21% decrease in short interest from the previous month. The short interest ratio (days to cover) is 5.0, indicating that it would take 5.0 days of the average trading volume of 119,092 shares to cover all short positions.Current Short Interest285,800 sharesPrevious Short Interest367,400 sharesChange Vs. Previous Month-22.21%Dollar Volume Sold Short$2.52 millionShort Interest Ratio5.0 Days to CoverLast Record DateJune 15, 2025Outstanding Shares5,960,000 sharesFloat Size3,310,000 sharesShort Percent of Float8.63%Today's Trading Volume18,849 sharesAverage Trading Volume119,092 sharesToday's Volume Vs. Average16% Short Selling Atara Biotherapeutics? Sign up to receive the latest short interest report for Atara Biotherapeutics and its competitors with MarketBeat's FREE newsletter. Email Address Skip Charts & View Short Interest HistoryShort Interest ChartDays to Cover ChartShort Percent of Float ChartATRA Short Interest Over TimeATRA Days to Cover Over TimeATRA Percentage of Float Shorted Over Time Atara Biotherapeutics Short Interest History Export to ExcelReport DateTotal Shares Sold ShortDollar Volume Sold ShortChange from Previous ReportPercentage of Float ShortedDays to CoverPrice on Report Date 6/15/2025285,800 shares $2.52 million -22.2%8.6%5 $8.82 5/31/2025367,400 shares $2.86 million -11.0%10.9%6.1 $7.78 5/15/2025412,900 shares $3.14 million -20.9%12.3%6.9 $7.61 4/30/2025522,100 shares $4.17 million -21.2%13.7%8.5 $7.99 4/15/2025662,200 shares $3.96 million -0.7%17.6%6.7 $5.98 3/31/2025666,800 shares $3.96 million -7.8%17.6%3.6 $5.94 3/15/2025723,300 shares $5.24 million +1.2%19.0%3.7 $7.25 2/28/2025715,100 shares $4.94 million +6.0%18.8%3.5 $6.91 2/15/2025674,600 shares $5.79 million -4.5%18.1%3.3 $8.59 1/31/2025706,500 shares $6.27 million +29.0%18.9%3.3 $8.88 Get the Latest News and Ratings for ATRA and Related StocksEnter your email address below to receive the latest news and analysts' ratings for Atara Biotherapeutics and its competitors with MarketBeat's FREE daily newsletter. 1/15/2025547,800 shares $7.21 million +2.7%12.7%2.7 $13.16 12/31/2024533,600 shares $7.10 million -3.3%12.4%4.8 $13.31 12/15/2024551,500 shares $5.70 million +1.4%13.0%5.4 $10.33 11/30/2024544,000 shares $6.62 million +4.7%13.0%5.1 $12.18 11/15/2024519,500 shares $6.23 million -18.4%12.4%3.5 $12.00 10/31/2024636,300 shares $5.67 million -0.5%16.0%4.6 $8.91 10/15/2024639,200 shares $5.36 million +21.4%16.1%5.4 $8.38 9/30/2024526,400 shares $4.28 million +13.7%13.3%4.5 $8.13 9/15/2024463,000 shares $4.50 million +12.8%12.6%3.6 $9.72 8/31/2024410,500 shares $3.12 million +8.5%11.0%3.2 $7.60 8/15/2024378,500 shares $2.59 million +5.0%9.4%4.7 $6.83 7/31/2024360,500 shares $3.54 million -33.2%9.0%4.5 $9.83 7/15/2024540,000 shares $6.03 million -6.1%13.4%6.7 $11.16 6/30/2024575,300 shares $4.89 million +33.5%14.4%7.6 $8.50 6/15/2024431,000 shares $5.51 million -96.2%10.8%7.2 $12.78 5/31/202411,270,000 shares $6.32 million -3.0%N/A8.5 $0.56 5/15/202411,620,000 shares $7.44 million -2.2%N/A7.2 $0.64 4/30/202411,880,000 shares $8.20 million +3.8%N/A6.9 $0.69 4/15/202411,450,000 shares $7.77 million +2.0%N/A4.4 $0.68 3/31/202411,230,000 shares $7.79 million +1.8%N/A3.7 $0.69 3/15/202411,030,000 shares $6.85 million +8.8%N/A3.2 $0.62 2/29/202410,140,000 shares $7.89 million -6.7%N/A2.8 $0.78 2/15/202410,870,000 shares $8.39 million +44.4%N/A2.9 $0.77 1/31/20247,530,000 shares $4.70 million +2.7%N/A1.3 $0.62 1/15/20247,330,000 shares $5.27 million -20.2%N/A1.4 $0.72 12/31/20239,190,000 shares $4.71 million -9.3%N/A1.9 $0.51 12/15/202310,130,000 shares $6.08 million -8.8%N/A2.2 $0.60 11/30/202311,110,000 shares $7.33 million +36.2%N/A2.8 $0.66 11/15/20238,160,000 shares $3.10 million -34.7%N/A2.2 $0.38 10/31/202312,490,000 shares $16.11 million +1.8%N/A6.1 $1.29Is Elon's empire crumbling? 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Click here to see the Tesla shock that could blindside everyone. 10/15/202312,270,000 shares $18.90 million +6.3%N/A10.5 $1.54 9/30/202311,540,000 shares $17.08 million -1.1%N/A9.5 $1.48 9/15/202311,670,000 shares $17.86 million +1.2%N/A9.7 $1.53 8/31/202311,530,000 shares $16.83 million -5.4%N/A7.5 $1.46 8/15/202312,190,000 shares $22.43 million -5.9%N/A6.9 $1.84 7/31/202312,950,000 shares $28.62 million +2.6%N/A6.9 $2.21 7/15/202312,620,000 shares $23.09 million +7.9%N/A6.7 $1.83 6/30/202311,700,000 shares $18.84 million -11.4%N/A6 $1.61 6/15/202313,200,000 shares $28.25 million +4.6%N/A7 $2.14 5/31/202312,620,000 shares $19.31 million -11.0%N/A7.6 $1.53 5/15/202314,180,000 shares $31.20 million -20.3%N/A10 $2.20 4/30/202317,790,000 shares $48.21 million -7.4%N/A13.8 $2.71 4/15/202319,210,000 shares $51.67 million -3.8%N/A15.9 $2.69 3/31/202319,960,000 shares $57.88 million +19.5%N/A17.1 $2.90 3/15/202316,700,000 shares $51.44 million +18.7%N/A13.1 $3.08 2/28/202314,070,000 shares $56.98 million +0.4%N/A11.3 $4.05 2/15/202314,010,000 shares $63.47 million -1.3%N/A11.4 $4.53 1/31/202314,190,000 shares $71.94 million +4.1%N/A10.3 $5.07 1/15/202313,630,000 shares $53.02 million +4.8%N/A9.5 $3.89 12/30/202213,010,000 shares $42.67 million +5.0%N/A9.1 $3.28 12/15/202212,390,000 shares $42.87 million +1.2%N/A8.4 $3.46 11/30/202212,240,000 shares $55.45 million +1.6%N/A8.4 $4.53 11/15/202212,050,000 shares $60.37 million +1.1%N/A7.7 $5.01 10/31/202211,920,000 shares $55.55 million +0.2%N/A6.9 $4.66 10/15/202211,900,000 shares $44.39 million -3.4%N/A5.7 $3.73 9/30/202212,320,000 shares $46.57 million -0.2%N/A4.6 $3.78 9/15/202212,350,000 shares $58.05 million +10.2%N/A4.7 $4.70 8/31/202211,210,000 shares $44.95 million -0.6%N/A4.4 $4.01 8/15/202211,280,000 shares $60.24 million +7.0%N/A4.7 $5.34 7/31/202210,540,000 shares $31.94 million +31.1%N/A4.8 $3.03 7/15/20228,040,000 shares $30.95 million -24.9%N/A4.4 $3.85 6/30/202210,700,000 shares $83.35 million -5.1%N/A9.2 $7.79 6/15/202211,270,000 shares $62.55 million -3.9%N/A10.2 $5.55 5/31/202211,730,000 shares $61.00 million +6.4%N/A11 $5.20 5/15/202211,020,000 shares $0.00 -6.5%N/A9.9 $0.00 4/30/202211,790,000 shares $74.98 million +6.0%N/A11.7 $6.36 4/15/202211,120,000 shares $89.07 million +14.3%N/A11.2 $8.01 3/31/20229,730,000 shares $90.39 million +11.3%N/A9.6 $9.29 3/15/20228,740,000 shares $74.38 million +20.6%N/A9 $8.51 2/28/20227,250,000 shares $93.16 million +2.6%N/A7.7 $12.85 2/15/20227,070,000 shares $105.84 million +1.4%N/A8.6 $14.97 1/31/20226,970,000 shares $107.06 million +17.3%N/A8.1 $15.36 1/15/20225,940,000 shares $95.46 million -36.9%N/A7.1 $16.07 12/31/20219,420,000 shares $148.46 million +3.4%N/A11.3 $15.76 12/15/20219,110,000 shares $146.03 million +4.8%N/A10.7 $16.03 11/30/20218,690,000 shares $155.46 million -3.3%N/A11 $17.89 11/15/20218,990,000 shares $153.46 million -17.0%N/A10.7 $17.07 10/29/202110,830,000 shares $167.65 million -1.3%N/A13.4 $15.48 10/15/202110,970,000 shares $165.87 million -6.4%13.4%14.3 $15.12 9/30/202111,720,000 shares $209.79 million -6.1%14.4%16.4 $17.90Is 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. 9/15/202112,480,000 shares $198.43 million +2.1%15.3%16.8 $15.90 8/31/202112,220,000 shares $183.06 million -4.4%15.0%16.2 $14.98 8/13/202112,780,000 shares $159.11 million -2.1%15.7%17.2 $12.45 7/30/202113,060,000 shares $166.52 million +8.0%16.1%16.7 $12.75 7/15/202112,090,000 shares $165.39 million +3.7%14.9%14.4 $13.68 6/30/202111,660,000 shares $181.31 million -7.7%14.4%12.4 $15.55 6/15/202112,630,000 shares $176.82 million -0.5%15.6%14.3 $14.00 5/28/202112,690,000 shares $172.08 million -0.7%15.7%13.9 $13.56 5/14/202112,780,000 shares $188.12 million +5.3%N/A13.5 $14.72 4/30/202112,140,000 shares $176.39 million -2.9%N/A13.2 $14.53 4/15/202112,500,000 shares $173.13 million -4.7%N/A0 $13.85 3/31/202113,120,000 shares $186.57 million +12.0%N/A15.2 $14.22 3/15/202111,710,000 shares $197.90 million +5.5%N/A13 $16.90 2/26/202111,100,000 shares $184.37 million -5.5%N/A11.6 $16.61 2/12/202111,740,000 shares $225.64 million -0.7%N/A12.4 $19.22 1/29/202111,820,000 shares $224.58 million +5.0%N/A11.7 $19.00 1/15/202111,260,000 shares $212.25 million -6.1%N/A11.6 $18.85 12/31/202011,990,000 shares $246.03 million -3.8%N/A13.3 $20.52 12/15/202012,460,000 shares $292.56 million +1.0%N/A14.2 $23.48 11/30/202012,340,000 shares $287.15 million -10.1%N/A13.5 $23.27 11/15/202013,730,000 shares $247.83 million -10.3%N/A16.4 $18.05 10/30/202015,310,000 shares $206.69 million -0.8%N/A19.7 $13.50 10/15/202015,440,000 shares $214.15 million +9.0%N/A19.1 $13.87 9/30/202014,170,000 shares $183.64 million +3.3%N/A17.4 $12.96 9/15/202013,720,000 shares $214.58 million -10.1%N/A12.9 $15.64 8/31/202015,260,000 shares $205.70 million +4.5%N/A14.3 $13.48 8/14/202014,610,000 shares $177.80 million +3.5%N/A11 $12.17 7/31/202014,110,000 shares $174.82 million -4.3%N/A8.9 $12.39 7/15/202014,740,000 shares $201.05 million +8.7%N/A9.1 $13.64 6/30/202013,560,000 shares $187.67 million +15.7%N/A7.9 $13.84 ATRA Short Interest - Frequently Asked Questions What is Atara Biotherapeutics' current short interest? Short interest is the volume of Atara Biotherapeutics shares that have been sold short but have not yet been closed out or covered. As of June 15th, investors have sold 285,800 shares of ATRA short. 8.63% of Atara Biotherapeutics' shares are currently sold short. Learn More on Atara Biotherapeutics' current short interest. What is a good short interest ratio for Atara Biotherapeutics? 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. ATRA shares currently have a short interest ratio of 5.0. Learn More on Atara Biotherapeutics's short interest ratio. What is a good short interest percentage for Atara Biotherapeutics? 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. 8.63% of Atara Biotherapeutics' floating shares are currently sold short. Is Atara Biotherapeutics' short interest increasing or decreasing? Atara Biotherapeutics saw a decrease in short interest in June. As of June 15th, there was short interest totaling 285,800 shares, a decrease of 22.2% from the previous total of 367,400 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 Atara Biotherapeutics' float size? Atara Biotherapeutics currently has issued a total of 5,960,000 shares. Some of Atara Biotherapeutics' 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. Atara Biotherapeutics currently has a public float of 3,310,000 shares. How does Atara Biotherapeutics' short interest compare to its competitors? 8.63% of Atara Biotherapeutics' shares are currently sold short. Here is how the short interest of companies in the industry of "pharmaceutical products" compare to Atara Biotherapeutics: AC Immune (2.23%), Tiziana Life Sciences Ltd (0.95%), ProKidney Corp. (17.84%), Editas Medicine, Inc. (10.29%), 4D Molecular Therapeutics, Inc. (9.96%), CytomX Therapeutics, Inc. (27.61%), Organigram Global Inc. (6.52%), Ventyx Biosciences, Inc. (10.12%), Galena Biopharma, Inc. (19.21%), Nuvectis Pharma, Inc. (19.91%), 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 ($69.26 billion), Invesco QQQ ($25.22 billion), iShares Russell 2000 ETF ($20.33 billion), iShares 20+ Year Treasury Bond ETF ($9.99 billion), MicroStrategy Incorporated ($9.12 billion), Canadian Natural Resources Limited ($6.73 billion), SPDR S&P Biotech ETF ($6.52 billion), Invesco S&P 500 Equal Weight ETF ($5.60 billion), Financial Select Sector SPDR Fund ($4.64 billion), and iShares iBoxx $ Investment Grade Corporate Bond ETF ($4.59 billion). View all of the most shorted stocks. What does it mean to sell short Atara Biotherapeutics stock? Short selling ATRA is an investing strategy that aims to generate trading profit from Atara Biotherapeutics as its price is falling. ATRA shares are trading down $0.24 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 Atara Biotherapeutics? A short squeeze for Atara Biotherapeutics occurs when it has a large amount of short interest and its stock increases in price. This forces short sellers to cover their short interest positions by buying actual shares of ATRA, which in turn drives the price of the stock up even further. How often is Atara Biotherapeutics' 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 ATRA, twice per month. The most recent reporting period available is June, 15 2025. 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