Athira Pharma (ATHA) Short Interest Ratio & Short Volume $3.62 -0.04 (-1.09%) Closing price 10/17/2025 04:00 PM EasternExtended Trading$3.66 +0.03 (+0.97%) As of 10/17/2025 05:12 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 Athira Pharma Short Interest DataAthira Pharma (ATHA) has a short interest of 92,300 shares, representing 2.56% of the float (the number of shares available for trading by the public). This marks a -3.95% decrease in short interest from the previous month. The short interest ratio (days to cover) is 3.4, indicating that it would take 3.4 days of the average trading volume of 44,159 shares to cover all short positions.Current Short Interest92,300 sharesPrevious Short Interest96,100 sharesChange Vs. Previous Month-3.95%Dollar Volume Sold Short$382.12 thousandShort Interest Ratio3.4 Days to CoverLast Record DateSeptember 30, 2025Outstanding Shares3,940,000 sharesFloat Size3,600,000 sharesShort Percent of Float2.56%Today's Trading Volume26,744 sharesAverage Trading Volume44,159 sharesToday's Volume Vs. Average61% Short Selling Athira Pharma? Sign up to receive the latest short interest report for Athira Pharma and its competitors with MarketBeat's FREE newsletter. Email Address Get Report View SMS TermsBy entering your phone number and clicking the sign-up button, you agree to receive periodic text messages from MarketBeat at the phone number you submitted, including texts that may be sent using an automatic telephone dialing system. 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Skip Charts & View Short Interest HistoryShort Interest ChartDays to Cover ChartShort Percent of Float ChartATHA Short Interest Over TimeATHA Days to Cover Over TimeATHA Percentage of Float Shorted Over Time Athira Pharma Short Interest History Export to ExcelReport DateTotal Shares Sold ShortDollar Volume Sold ShortChange from Previous ReportPercentage of Float ShortedDays to CoverPrice on Report Date 9/30/202592,300 shares $382.12 thousand -4.0%2.6%3.4 $4.14 9/15/202596,100 shares $369.12 thousand -88.6%2.8%3.7 $3.84 8/31/2025842,800 shares $327.51 thousand -5.9%2.5%4.5 $0.39 8/15/2025896,000 shares $359.03 thousand -5.2%2.7%1.6 $0.40 7/31/2025945,300 shares $359.21 thousand -8.2%2.8%1.7 $0.38 7/15/20251,030,000 shares $408.19 thousand -22.0%3.1%1.8 $0.40 6/30/20251,320,000 shares $398.64 thousand -10.8%3.9%2.3 $0.30 6/15/20251,480,000 shares $449.92 thousand +65.4%4.4%2.7 $0.30 5/31/2025894,900 shares $269.99 thousand +19.4%2.7%1.6 $0.30 5/15/2025749,800 shares $209.27 thousand -12.3%2.2%3.6 $0.28 Get the Latest News and Ratings for ATHA and Related StocksEnter your email address below to receive the latest news and analysts' ratings for Athira Pharma and its competitors with MarketBeat's FREE daily newsletter. 4/30/2025855,100 shares $240.80 thousand +3.5%2.5%4.3 $0.28 4/15/2025826,600 shares $195.90 thousand -11.6%2.5%3.8 $0.24 3/31/2025934,500 shares $261.66 thousand -10.1%2.6%4.6 $0.28 3/15/20251,040,000 shares $348.71 thousand +17.3%2.9%4.6 $0.34 2/28/2025886,300 shares $364.00 thousand -0.2%2.5%3.7 $0.41 2/15/2025888,000 shares $415.58 thousand -6.5%2.5%3.4 $0.47 1/31/2025949,500 shares $498.77 thousand -30.7%2.7%2.1 $0.53 1/15/20251,370,000 shares $742.40 thousand +17.1%3.9%0.3 $0.54 12/31/20241,170,000 shares $686.44 thousand -17.6%3.3%0.3 $0.59 12/15/20241,420,000 shares $830.56 thousand -21.6%4.0%0.3 $0.58 11/30/20241,810,000 shares $1.19 million -18.5%5.1%0.4 $0.66 11/15/20242,220,000 shares $1.49 million +43.2%6.2%0.4 $0.67 10/31/20241,550,000 shares $663.56 thousand -0.6%4.4%0.3 $0.43 10/15/20241,560,000 shares $693.26 thousand -0.6%4.4%1.9 $0.44 9/30/20241,570,000 shares $700.22 thousand -4.9%4.4%2.1 $0.45 9/15/20241,650,000 shares $871.37 thousand +66.2%4.7%2.3 $0.53 8/31/2024992,900 shares $3.07 million +0.2%2.8%1.7 $3.09 8/15/2024990,700 shares $2.96 million +0.2%2.8%7.4 $2.99 7/31/2024989,200 shares $3.16 million -8.4%2.8%7.6 $3.19 7/15/20241,080,000 shares $3.63 million -1.8%3.1%7.5 $3.36 6/30/20241,100,000 shares $2.92 million +8.9%3.1%7 $2.65 6/15/20241,010,000 shares $2.57 million +13.6%2.9%5.8 $2.54 5/31/2024889,500 shares $2.33 million -3.7%2.5%3.4 $2.62 5/15/2024923,300 shares $2.04 million -12.1%2.6%3 $2.21 4/30/20241,050,000 shares $2.07 million +1.0%3.0%3.1 $1.97 4/15/20241,040,000 shares $2.14 million +3.0%2.9%2.9 $2.06 3/31/20241,010,000 shares $2.77 million +3.1%2.9%2.5 $2.74 3/15/2024979,300 shares $2.57 million +25.0%2.8%2.2 $2.62 2/29/2024783,600 shares $3.02 million +20.5%2.2%2 $3.85 2/15/2024650,300 shares $2.38 million -9.4%1.8%1.9 $3.66 1/31/2024717,600 shares $2.27 million +39.6%2.1%2.2 $3.17 1/15/2024513,900 shares $1.54 million +25.4%1.5%1.6 $3.00 12/31/2023409,900 shares $996.06 thousand -16.6%1.2%1.4 $2.43 12/15/2023491,600 shares $1.14 million -1.6%1.4%2.3 $2.31 11/30/2023499,600 shares $719.42 thousand +3.0%1.4%2.7 $1.44 11/15/2023484,900 shares $770.99 thousand -8.8%1.4%2.9 $1.59 10/31/2023531,500 shares $829.14 thousand -6.2%1.5%3.6 $1.56 10/15/2023566,700 shares $1.01 million -23.6%1.6%4 $1.79 9/30/2023741,900 shares $1.50 million -7.6%2.1%5.1 $2.02 9/15/2023803,300 shares $1.62 million -2.5%2.3%5.3 $2.02 8/31/2023823,500 shares $1.84 million -17.3%2.3%3.4 $2.23 8/15/2023996,000 shares $2.66 million -16.3%2.8%3.8 $2.67 7/31/20231,190,000 shares $3.47 million -3.3%3.4%4.7 $2.92 7/15/20231,230,000 shares $3.78 million +7.0%3.5%4.9 $3.07 6/30/20231,150,000 shares $3.39 million -46.0%3.3%4.4 $2.95 6/15/20232,130,000 shares $6.48 million +3.9%6.1%7.7 $3.04 5/31/20232,050,000 shares $5.68 million No Change5.8%9 $2.77 5/15/20232,050,000 shares $5.88 million -5.5%5.8%9.6 $2.87 4/30/20232,170,000 shares $6.05 million -1.8%6.4%9.6 $2.79 4/15/20232,210,000 shares $5.68 million -9.4%6.5%8.3 $2.57 3/31/20232,440,000 shares $6.10 million +8.4%6.8%7.7 $2.50 3/15/20232,250,000 shares $6.05 million +9.8%N/A6.9 $2.69 2/28/20232,050,000 shares $6.31 million +5.7%5.5%6.3 $3.08 2/15/20231,940,000 shares $6.44 million +4.9%5.2%5.9 $3.32 1/31/20231,850,000 shares $7.47 million +20.9%5.0%5.6 $4.04 1/15/20231,530,000 shares $5.89 million No Change4.1%4.8 $3.85 12/30/20221,530,000 shares $4.85 million -1.9%4.1%5.5 $3.17 12/15/20221,560,000 shares $4.96 million -4.3%N/A5.9 $3.18 11/30/20221,630,000 shares $5.07 million -3.0%N/A6.4 $3.11 11/15/20221,680,000 shares $5.29 million -6.2%N/A6.9 $3.15 10/31/20221,790,000 shares $5.92 million -2.2%N/A7 $3.31 10/15/20221,830,000 shares $5.87 million +0.6%5.1%5.9 $3.21 9/30/20221,820,000 shares $5.41 million -2.2%5.1%5.6 $2.97 9/15/20221,860,000 shares $6.64 million +3.3%5.2%3.3 $3.57 8/31/20221,800,000 shares $6.08 million -1.1%5.0%1.9 $3.38 8/15/20221,820,000 shares $7.10 million +2.8%5.1%1.9 $3.90 7/31/20221,770,000 shares $6.16 million -12.8%5.1%1.8 $3.48 7/15/20222,030,000 shares $6.98 million -27.2%5.9%2.2 $3.44 6/30/20222,790,000 shares $8.51 million -11.2%8.0%3.1 $3.05 6/15/20223,140,000 shares $25.81 million +6.8%9.0%4.1 $8.22 5/31/20222,940,000 shares $26.70 million +1.4%8.5%10.1 $9.08 5/15/20222,900,000 shares $24.01 million +7.4%8.3%10 $8.28 4/30/20222,700,000 shares $27.78 million +20.0%7.8%9.7 $10.29 4/15/20222,250,000 shares $26.46 million -1.3%6.5%7.8 $11.76 3/31/20222,280,000 shares $30.78 million -17.1%6.6%7.7 $13.50 3/15/20222,750,000 shares $26.57 million +13.2%8.0%10.3 $9.66 2/28/20222,430,000 shares $22.26 million +3.0%7.0%8.4 $9.16 2/15/20222,360,000 shares $24.00 million +18.6%6.8%7.5 $10.17 1/31/20221,990,000 shares $20.50 million -2.9%6.3%5.5 $10.30 1/15/20222,050,000 shares $22.65 million +0.5%6.0%5 $11.05 12/31/20212,040,000 shares $26.58 million +15.3%6.0%4.6 $13.03 12/15/20211,770,000 shares $22.97 million -9.2%5.2%4.1 $12.98 11/30/20211,950,000 shares $26.29 million +28.3%5.7%4.4 $13.48 11/15/20211,520,000 shares $23.85 million +29.9%4.4%3.6 $15.69 10/29/20211,170,000 shares $15.29 million +9.4%3.4%2.9 $13.07 10/15/20211,070,000 shares $10.23 million -6.1%3.2%2.9 $9.56 9/30/20211,140,000 shares $10.69 million -15.6%3.4%2.8 $9.38 9/15/20211,350,000 shares $13.62 million +20.5%4.0%2.4 $10.09 8/31/20211,120,000 shares $11.86 million -9.7%3.3%0.9 $10.59 8/13/20211,240,000 shares $12.19 million -6.1%3.6%1 $9.83 7/30/20211,320,000 shares $12.69 million No Change4.0%1.1 $9.61 7/15/20211,320,000 shares $13.09 million +9.1%4.0%1.1 $9.92 6/30/20211,210,000 shares $12.39 million -28.4%3.6%1.1 $10.24 6/15/20211,690,000 shares $31.65 million +21.6%5.1%1.7 $18.73 5/28/20211,390,000 shares $27.72 million +53.8%4.2%4.6 $19.94 5/14/2021904,000 shares $16.34 million +7.1%2.7%3.3 $18.08 4/30/2021843,800 shares $16.22 million -27.9%2.5%2.8 $19.22 4/15/20211,170,000 shares $20.46 million +25.6%3.5%3.1 $17.49 3/31/2021931,400 shares $15.74 million +16.3%2.8%2.3 $16.90 3/15/2021800,900 shares $17.27 million +26.4%2.5%1.8 $21.56 2/26/2021633,800 shares $13.24 million -4.4%2.0%1.5 $20.89 2/12/2021663,100 shares $14.87 million -17.9%2.0%1.7 $22.42 1/29/2021807,900 shares $17.14 million -13.8%2.5%2.2 $21.21 1/15/2021937,200 shares $25.11 million No Change3.0%2.7 $26.79 ATHA Short Interest - Frequently Asked Questions What is Athira Pharma's current short interest? Short interest is the volume of Athira Pharma shares that have been sold short but have not yet been closed out or covered. As of September 30th, traders have sold 92,300 shares of ATHA short. 2.56% of Athira Pharma's shares are currently sold short. Learn More on Athira Pharma's current short interest. What is a good short interest ratio for Athira Pharma? 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. ATHA shares currently have a short interest ratio of 3.0. Learn More on Athira Pharma's short interest ratio. What is a good short interest percentage for Athira Pharma? 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. 2.56% of Athira Pharma's floating shares are currently sold short. Is Athira Pharma's short interest increasing or decreasing? Athira Pharma saw a drop in short interest during the month of September. As of September 30th, there was short interest totaling 92,300 shares, a drop of 4.0% from the previous total of 96,100 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 Athira Pharma's float size? Athira Pharma currently has issued a total of 3,940,000 shares. Some of Athira Pharma'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. Athira Pharma currently has a public float of 3,600,000 shares. How does Athira Pharma's short interest compare to its competitors? 2.56% of Athira Pharma's shares are currently sold short. Here is how the short interest of companies in the industry of "pharmaceutical products" compare to Athira Pharma: Genenta Science S.p.A. Unsponsored ADR (0.01%), Aligos Therapeutics, Inc. (6.25%), Adlai Nortye Ltd. Sponsored ADR (0.01%), Acrivon Therapeutics, Inc. (5.15%), Talphera, Inc. (2.47%), Hyperion DeFi, Inc. (32.92%), Barinthus Biotherapeutics PLC Sponsored ADR (0.33%), Quantum Biopharma Ltd. (2.16%), Celularity, Inc. (4.29%), Skye Bioscience, Inc. (16.35%), Which stocks are the most shorted right now? As of the most recent reporting period, the following stocks had the largest short interest positions: AppLovin Corporation ($15.71 billion), Robinhood Markets, Inc. ($7.56 billion), Reddit Inc. ($4.55 billion), Coinbase Global, Inc. ($4.53 billion), CoreWeave Inc. ($4.43 billion), Charter Communications, Inc. ($4.07 billion), Seagate Technology Holdings PLC ($3.94 billion), IonQ, Inc. ($3.78 billion), TC Energy Corporation ($3.13 billion), and Live Nation Entertainment, Inc. ($3.12 billion). View all of the most shorted stocks. What does it mean to sell short Athira Pharma stock? Short selling ATHA is an investing strategy that aims to generate trading profit from Athira Pharma as its price is falling. ATHA shares are trading down $0.04 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 Athira Pharma? A short squeeze for Athira Pharma 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 ATHA, which in turn drives the price of the stock up even further. How often is Athira Pharma'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 ATHA, twice per month. The most recent reporting period available is September, 30 2025. More Short Interest Resources from MarketBeat Related Companies Genenta Science Short Interest Data Aligos Therapeutics Short Interest Data Adlai Nortye Short Interest Data Acrivon Therapeutics Short Interest Data Talphera Short Interest Data Hyperion DeFi Short Interest Data Barinthus Biotherapeutics Short Interest Data Quantum Biopharma Short Interest Data Celularity Short Interest Data Skye Bioscience 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:ATHA) was last updated on 10/19/2025 by MarketBeat.com Staff From Our PartnersINVESTOR ALERT: Tiny “$3 AI Wonder Stock” on the Verge of Blasting OffRight now, we’re witnessing a monumental shift in the world.Traders Agency | Sponsored$100 Trillion “AI Metal” Found in American Ghost TownJeff Brown recently traveled to a ghost town in the middle of an American desert… To investigate what could...Brownstone Research | SponsoredFront-Run Buffett's Shocking Gold MoveA Historic Gold Announcement Is About to Rock Wall Street? 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