atai Life Sciences (ATAI) Short Interest Ratio & Short Volume $4.13 -0.02 (-0.48%) Closing price 08/8/2025 04:00 PM EasternExtended Trading$4.14 +0.01 (+0.36%) As of 08/8/2025 07:53 PM 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 ForecastsChartCompetitorsEarningsFDA EventsHeadlinesInsider TradesOptions ChainOwnershipSEC FilingsShort InterestTrendsBuy This Stock atai Life Sciences Short Interest Dataatai Life Sciences (ATAI) has a short interest of 16.18 million shares, representing 11.80% of the float (the number of shares available for trading by the public). This marks a 58.78% increase in short interest from the previous month. The short interest ratio (days to cover) is 4.0, indicating that it would take 4.0 days of the average trading volume of 7.15 million shares to cover all short positions.Current Short Interest16,180,000 sharesPrevious Short Interest10,190,000 sharesChange Vs. Previous Month+58.78%Dollar Volume Sold Short$42.88 millionShort Interest Ratio4.0 Days to CoverLast Record DateJuly 15, 2025Outstanding Shares200,340,000 sharesFloat Size137,080,000 sharesShort Percent of Float11.80%Today's Trading Volume3,576,800 sharesAverage Trading Volume7,145,983 sharesToday's Volume Vs. Average50% 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 7/15/202516,180,000 shares $42.88 million +58.8%11.8%4 $2.65 6/30/202510,190,000 shares $22.32 million -7.0%7.4%3.1 $2.19 6/15/202510,960,000 shares $23.13 million -5.1%8.0%5 $2.11 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 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. 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 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 $1.04Trump’s national nightmare is here (Ad)Porter Stansberry and Jeff Brown say a new U.S. national emergency is already underway — and it could trigger the biggest forced rotation of capital since World War II. They reveal why Trump is mobilizing America’s tech giants… and name the two stocks most likely to soar as trillions shift behind the scenes.Watch the National Emergency broadcast here 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 $1.28 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 $14.59Trump’s national nightmare is here (Ad)Porter Stansberry and Jeff Brown say a new U.S. national emergency is already underway — and it could trigger the biggest forced rotation of capital since World War II. They reveal why Trump is mobilizing America’s tech giants… and name the two stocks most likely to soar as trillions shift behind the scenes.Watch the National Emergency broadcast here 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 $15.19 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 closed out or covered. As of July 15th, investors have sold 16,180,000 shares of ATAI short. 11.80% 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 4.0. 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, and 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. 11.80% of atai Life Sciences' floating shares are currently sold short. Is atai Life Sciences' short interest increasing or decreasing? atai Life Sciences saw a increase in short interest in July. As of July 15th, there was short interest totaling 16,180,000 shares, an increase of 58.8% from the previous total of 10,190,000 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 200,340,000 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? 11.80% 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: NewAmsterdam Pharma Company N.V. (11.06%), Ultragenyx Pharmaceutical Inc. (9.13%), Organon & Co. (5.68%), Recursion Pharmaceuticals, Inc. (34.95%), Amneal Pharmaceuticals, Inc. (3.76%), Mirum Pharmaceuticals, Inc. (13.10%), Bausch Health Cos Inc. (2.56%), Catalyst Pharmaceuticals, Inc. (7.31%), Xenon Pharmaceuticals Inc. (8.48%), Apellis Pharmaceuticals, Inc. (13.06%), Which stocks are the most shorted right now? As of the most recent reporting period, the following stocks had the largest short interest positions: Coinbase Global, Inc. ($5.11 billion), Charter Communications, Inc. ($4.76 billion), Reddit Inc. ($2.84 billion), SoFi Technologies, Inc. ($2.79 billion), Seagate Technology Holdings PLC ($2.79 billion), Live Nation Entertainment, Inc. ($2.67 billion), Rocket Lab Corporation ($2.49 billion), AST SpaceMobile, Inc. ($2.12 billion), Moderna, Inc. ($2.09 billion), and Omnicom Group Inc. ($2.04 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 $0.02 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 July, 15 2025. More Short Interest Resources from MarketBeat Related Companies NewAmsterdam Pharma Short Interest Data Ultragenyx Pharmaceutical Short Interest Data Organon & Co. Short Interest Data Recursion Pharmaceuticals Short Interest Data Amneal Pharmaceuticals Short Interest Data Mirum Pharmaceuticals Short Interest Data Bausch Health Cos Short Interest Data Catalyst Pharmaceuticals Short Interest Data Xenon Pharmaceuticals Short Interest Data Apellis Pharmaceuticals 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 8/9/2025 by MarketBeat.com Staff From Our PartnersYour blueprint for crypto wealthMark August 12th on your calendar. 27 of crypto's most successful minds are about to reveal everything…Crypto 101 Media | SponsoredHIDDEN IN THE BOOK OF GENESIS…“This land I will give to you…” — a 4,000-year-old line from Genesis may hold the key to unlocking a $150 tril...Paradigm Press | SponsoredMan Who Called Nvidia at $1.10 Says Buy This Now...In 2004, one man called Nvidia before just about anyone knew it existed. 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