Atai Life Sciences (ATAI) Short Interest Ratio & Short Volume $2.18 -0.05 (-2.24%) As of 04:00 PM Eastern Add Compare Share Share Short Interest Stock AnalysisAnalyst ForecastsChartCompetitorsEarningsHeadlinesInsider TradesOptions ChainOwnershipSEC FilingsShort InterestTrendsBuy This Stock Atai Life Sciences Short Interest DataAtai Life Sciences (ATAI) has a short interest of 11.55 million shares, representing 8.43% of the float (the number of shares available for trading by the public). This marks a -9.70% decrease in short interest from the previous month. The short interest ratio (days to cover) is 5.7, indicating that it would take 5.7 days of the average trading volume of 1.68 million shares to cover all short positions.Current Short Interest11,550,000 sharesPrevious Short Interest12,790,000 sharesChange Vs. Previous Month-9.70%Dollar Volume Sold Short$26.22 millionShort Interest Ratio5.7 Days to CoverLast Record DateMay 31, 2025Outstanding Shares200,338,000 sharesFloat Size137,080,000 sharesShort Percent of Float8.43%Today's Trading Volume1,234,886 sharesAverage Trading Volume1,678,461 sharesToday's Volume Vs. Average74% Short Selling Atai Life Sciences? Sign up to receive the latest short interest report for Atai Life Sciences and its competitors with MarketBeat's FREE newsletter. Email Address Skip Charts & View Short Interest HistoryShort Interest ChartDays to Cover ChartShort Percent of Float ChartATAI Short Interest Over TimeATAI Days to Cover Over TimeATAI Percentage of Float Shorted Over Time Atai Life Sciences Short Interest History Export to ExcelReport DateTotal Shares Sold ShortDollar Volume Sold ShortChange from Previous ReportPercentage of Float ShortedDays to CoverPrice on Report Date 5/31/202511,550,000 shares $26.22 million -9.7%8.4%5.7 $2.27 5/15/202512,790,000 shares $20.85 million +4.9%9.5%6.7 $1.63 4/30/202512,190,000 shares $18.29 million +0.4%9.0%5.1 $1.50 4/15/202512,140,000 shares $16.87 million +3.9%8.9%4.4 $1.39 3/31/202511,680,000 shares $15.88 million +12.3%8.6%4.2 $1.36 3/15/202510,400,000 shares $15.39 million -5.1%7.8%3.8 $1.48 2/28/202510,960,000 shares $18.85 million -1.8%8.3%4.1 $1.72 2/15/202511,160,000 shares $25.67 million -1.3%8.9%4.3 $2.30 1/31/202511,310,000 shares $17.53 million -2.1%9.7%4.8 $1.55 1/15/202511,550,000 shares $16.63 million +7.5%9.9%6.9 $1.44 Get the Latest News and Ratings for ATAI and Related StocksEnter your email address below to receive the latest news and analysts' ratings for Atai Life Sciences and its competitors with MarketBeat's FREE daily newsletter. 12/31/202410,740,000 shares $14.28 million +1.2%9.2%6.6 $1.33 12/15/202410,610,000 shares $14.43 million +4.0%9.1%7.9 $1.36 11/30/202410,200,000 shares $18.16 million +3.3%8.7%8.4 $1.78 11/15/20249,870,000 shares $15.89 million +4.7%8.4%8.8 $1.61 10/31/20249,430,000 shares $10.00 million -1.7%8.1%12.5 $1.06 10/15/20249,590,000 shares $10.45 million +1.2%8.2%16 $1.09 9/30/20249,480,000 shares $11.00 million -1.6%8.1%15.8 $1.16 9/15/20249,630,000 shares $12.52 million +9.7%8.2%15.4 $1.30 8/31/20248,780,000 shares $11.41 million -8.3%7.5%12.7 $1.30 8/15/20249,570,000 shares $11.96 million +9.0%8.2%12 $1.25 7/31/20248,780,000 shares $13.61 million -5.4%7.5%10.7 $1.55 7/15/20249,280,000 shares $14.94 million +11.5%8.0%10.4 $1.61 6/30/20248,320,000 shares $11.07 million +5.1%7.1%8.4 $1.33 6/15/20247,920,000 shares $10.85 million +14.8%6.8%5.8 $1.37 5/31/20246,900,000 shares $10.83 million +12.9%5.9%4.8 $1.57 5/15/20246,110,000 shares $12.53 million -3.2%5.3%4 $2.05 4/30/20246,310,000 shares $12.49 million +7.0%5.4%4 $1.98 4/15/20245,900,000 shares $12.21 million +6.3%5.1%3.7 $2.07 3/31/20245,550,000 shares $10.93 million +6.5%4.8%3.2 $1.97 3/15/20245,210,000 shares $9.22 million +47.6%4.5%3.5 $1.77 2/29/20243,530,000 shares $6.85 million -27.5%3.0%2.5 $1.94 2/15/20244,870,000 shares $8.77 million +2.5%4.2%3.7 $1.80 1/31/20244,750,000 shares $8.46 million +7.7%4.2%3.8 $1.78 1/15/20244,410,000 shares $8.64 million +1.9%3.9%3.9 $1.96 12/31/20234,330,000 shares $6.11 million -4.2%3.8%4.3 $1.41 12/15/20234,520,000 shares $5.70 million -6.6%4.0%6.1 $1.26 11/30/20234,840,000 shares $5.03 million -4.9%4.2%7.8 $1.04 11/15/20235,090,000 shares $6.11 million -9.6%4.5%9.7 $1.20 10/31/20235,630,000 shares $6.92 million +20.6%4.9%11.1 $1.23 10/15/20234,670,000 shares $5.98 million -0.6%4.1%8.7 $1.28Get Ready for Elon Musk’s BIGGEST Comeback Yet (Ad)Tesla's About to Prove Everyone Wrong... Again Back in 2018, when Jeff Brown told everyone to buy Tesla… The "experts" said Elon was finished and Tesla was headed for bankruptcy. Now they're saying the same thing, but Jeff has uncovered Tesla's next breakthrough. Click here to see why Tesla's about to prove everyone wrong... again. 9/30/20234,700,000 shares $6.06 million +3.3%4.1%6.4 $1.29 9/15/20234,550,000 shares $6.60 million +10.4%4.0%5.3 $1.45 8/31/20234,120,000 shares $6.30 million -0.2%3.6%4.3 $1.53 8/15/20234,130,000 shares $6.65 million +1.0%3.6%4.2 $1.61 7/31/20234,090,000 shares $8.55 million +0.3%3.6%4.1 $2.09 7/15/20234,080,000 shares $8.24 million -9.7%3.5%3.9 $2.02 6/30/20234,520,000 shares $7.77 million -6.4%3.9%4.2 $1.72 6/15/20234,830,000 shares $8.65 million -2.8%4.2%4.3 $1.79 5/31/20234,970,000 shares $8.90 million -2.9%4.3%4.6 $1.79 5/15/20235,120,000 shares $10.24 million -3.4%4.4%4.5 $2.00 4/30/20235,300,000 shares $10.12 million +6.2%4.6%4.4 $1.91 4/15/20234,990,000 shares $9.38 million +3.1%4.3%3.8 $1.88 3/31/20234,840,000 shares $8.76 million +14.4%4.1%3.4 $1.81 3/15/20234,230,000 shares $5.20 million +3.9%3.5%3.1 $1.23 2/28/20234,070,000 shares $6.84 million +5.2%3.3%3 $1.68 2/15/20233,870,000 shares $6.97 million -14.0%3.2%2.8 $1.80 1/31/20234,500,000 shares $8.01 million -24.6%3.7%3 $1.78 1/15/20235,970,000 shares $10.75 million +1.5%4.9%4.3 $1.80 12/30/20225,880,000 shares $15.64 million +7.5%4.8%4.8 $2.66 12/15/20225,470,000 shares $16.74 million +9.2%4.5%5.7 $3.06 11/30/20225,010,000 shares $17.69 million +5.5%4.1%5.7 $3.53 11/15/20224,750,000 shares $13.68 million -13.2%3.9%5.6 $2.88 10/31/20225,470,000 shares $16.14 million -12.9%4.5%7.8 $2.95 10/15/20226,280,000 shares $18.90 million -2.0%5.2%8.8 $3.01 9/30/20226,410,000 shares $21.22 million -1.1%5.3%8.6 $3.31 9/15/20226,480,000 shares $26.83 million +0.9%5.5%8.4 $4.14 8/31/20226,420,000 shares $28.89 million +3.6%5.5%8.1 $4.50 8/15/20226,200,000 shares $29.02 million +9.7%5.3%7.5 $4.68 7/31/20225,650,000 shares $21.81 million +9.9%4.8%6.5 $3.86 7/15/20225,140,000 shares $21.85 million -13.5%4.4%6.1 $4.25 6/30/20225,940,000 shares $21.62 million +35.6%5.1%7.3 $3.64 6/15/20224,380,000 shares $14.50 million +9.0%3.8%5.1 $3.31 5/31/20224,020,000 shares $16.00 million +1.8%3.4%4.6 $3.98 5/15/20223,950,000 shares $14.38 million +21.5%3.4%4.7 $3.64 4/30/20223,250,000 shares $13.94 million +10.9%2.8%3.8 $4.29 4/15/20222,930,000 shares $15.59 million +4.3%2.5%3.4 $5.32 3/31/20222,810,000 shares $14.30 million -11.9%2.4%2.9 $5.09 3/15/20223,190,000 shares $15.76 million +8.1%2.7%3.3 $4.94 2/28/20222,950,000 shares $16.93 million -9.0%2.5%2.6 $5.74 2/15/20223,240,000 shares $19.12 million -17.8%2.7%2.9 $5.90 1/31/20223,940,000 shares $21.00 million +14.5%3.3%3.7 $5.33 1/15/20223,440,000 shares $20.50 million -19.4%2.9%3.4 $5.96 12/31/20214,270,000 shares $32.58 million +50.9%3.7%4.8 $7.63 12/15/20212,830,000 shares $19.30 million +25.2%2.4%3.7 $6.82 11/30/20212,260,000 shares $24.81 million +11.3%2.0%5 $10.98 11/15/20212,030,000 shares $26.09 million -1.0%1.8%4.9 $12.85 10/29/20212,050,000 shares $29.91 million +0.5%1.9%5.8 $14.59 10/15/20212,040,000 shares $27.54 million +2.0%1.9%6.7 $13.50 9/30/20212,000,000 shares $29.58 million +16.3%1.8%6.3 $14.79 9/15/20211,720,000 shares $26.13 million +10.3%1.6%5 $15.19Get Ready for Elon Musk’s BIGGEST Comeback Yet (Ad)Tesla's About to Prove Everyone Wrong... Again Back in 2018, when Jeff Brown told everyone to buy Tesla… The "experts" said Elon was finished and Tesla was headed for bankruptcy. Now they're saying the same thing, but Jeff has uncovered Tesla's next breakthrough. Click here to see why Tesla's about to prove everyone wrong... again. 8/31/20211,560,000 shares $25.55 million +14.7%1.4%2.9 $16.38 8/13/20211,360,000 shares $18.52 million No Change1.2%2.2 $13.62 ATAI Short Interest - Frequently Asked Questions What is Atai Life Sciences' current short interest? Short interest is the volume of Atai Life Sciences shares that have been sold short but have not yet been covered or closed out. As of May 31st, investors have sold 11,550,000 shares of ATAI short. 8.43% of Atai Life Sciences' shares are currently sold short. Learn More on Atai Life Sciences' current short interest. What is a good short interest ratio for Atai Life Sciences? 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. ATAI shares currently have a short interest ratio of 6.0. Learn More on Atai Life Sciences's short interest ratio. Which institutional investors are shorting Atai Life Sciences? As of the most recent reporting period, the following institutional investors, funds, and major shareholders have reported short positions of Atai Life Sciences: Simplex Trading LLC. These positions are disclosed in Form 13F filings with the Securities and Exchange Commission. What is a good short interest percentage for Atai Life Sciences? 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. 8.43% of Atai Life Sciences' floating shares are currently sold short. Is Atai Life Sciences' short interest increasing or decreasing? Atai Life Sciences saw a decline in short interest in May. As of May 31st, there was short interest totaling 11,550,000 shares, a decline of 9.7% from the previous total of 12,790,000 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 Atai Life Sciences' float size? Atai Life Sciences currently has issued a total of 200,338,000 shares. Some of Atai Life Sciences' 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. Atai Life Sciences currently has a public float of 137,080,000 shares. How does Atai Life Sciences' short interest compare to its competitors? 8.43% of Atai Life Sciences' shares are currently sold short. Here is how the short interest of companies in the industry of "pharmaceutical products" compare to Atai Life Sciences: Immunocore Holdings plc (16.47%), Galapagos NV (2.95%), Agios Pharmaceuticals, Inc. (7.67%), Twist Bioscience Co. (18.46%), Tarsus Pharmaceuticals, Inc. (23.01%), IDEAYA Biosciences, Inc. (13.33%), Centessa Pharmaceuticals plc (6.20%), Recursion Pharmaceuticals, Inc. (35.08%), Indivior PLC (2.04%), Apogee Therapeutics, Inc. (27.20%), 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 Atai Life Sciences stock? Short selling ATAI is an investing strategy that aims to generate trading profit from Atai Life Sciences as its price is falling. ATAI shares are trading down $0.05 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 Atai Life Sciences? A short squeeze for Atai Life Sciences 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 ATAI, which in turn drives the price of the stock up even further. How often is Atai Life Sciences' 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 ATAI, twice per month. The most recent reporting period available is May, 31 2025. More Short Interest Resources from MarketBeat Related Companies Immunocore Short Interest Data Galapagos Short Interest Data Agios Pharmaceuticals Short Interest Data Twist Bioscience Short Interest Data Tarsus Pharmaceuticals Short Interest Data IDEAYA Biosciences Short Interest Data Centessa Pharmaceuticals Short Interest Data Recursion Pharmaceuticals Short Interest Data Indivior Short Interest Data Apogee Therapeutics 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 (NASDAQ:ATAI) was last updated on 6/12/2025 by MarketBeat.com Staff From Our PartnersTrump’s Exec Order #14154 could be a “Millionaire-Maker”Former Presidential Advisor, Jim Rickards, says Trump could “rewire our economy and hand millions of Americans...Paradigm Press | SponsoredTrump wipes out trillions overnight…Is there anybody more powerful than Donald Trump right now? 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