Aldeyra Therapeutics (ALDX) Short Interest Ratio & Short Volume $4.93 -0.08 (-1.60%) Closing price 09/19/2025 04:00 PM EasternExtended Trading$4.92 0.00 (-0.10%) As of 09/19/2025 07:56 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 Aldeyra Therapeutics Short Interest DataAldeyra Therapeutics (ALDX) has a short interest of 5.29 million shares, representing 9.77% of the float (the number of shares available for trading by the public). This marks a 6.01% increase in short interest from the previous month. The short interest ratio (days to cover) is 5.1, indicating that it would take 5.1 days of the average trading volume of 764,973 shares to cover all short positions.Current Short Interest5,290,000 sharesPrevious Short Interest4,990,000 sharesChange Vs. Previous Month+6.01%Dollar Volume Sold Short$30.89 millionShort Interest Ratio5.1 Days to CoverLast Record DateAugust 31, 2025Outstanding Shares59,900,000 sharesShort Percent of Float9.77%Today's Trading Volume1,501,069 sharesAverage Trading Volume764,973 sharesToday's Volume Vs. Average196% Short Selling Aldeyra Therapeutics? Sign up to receive the latest short interest report for Aldeyra Therapeutics 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 ChartALDX Short Interest Over TimeALDX Days to Cover Over TimeALDX Percentage of Float Shorted Over Time Aldeyra Therapeutics Short Interest History Export to ExcelReport DateTotal Shares Sold ShortDollar Volume Sold ShortChange from Previous ReportPercentage of Float ShortedDays to CoverPrice on Report Date 8/31/20255,290,000 shares $30.89 million +6.0%9.8%5.1 $5.84 8/15/20254,990,000 shares $26.90 million -0.8%N/A4.9 $5.39 7/31/20255,030,000 shares $25.10 million +8.6%9.3%4.8 $4.99 7/15/20254,630,000 shares $23.01 million +3.6%N/A4.1 $4.97 6/30/20254,470,000 shares $17.12 million -0.5%8.3%3.5 $3.83 6/15/20254,490,000 shares $12.48 million -4.7%8.3%2.5 $2.78 5/31/20254,710,000 shares $10.17 million -0.8%8.6%2.7 $2.16 5/15/20254,750,000 shares $10.26 million -4.0%8.7%2.7 $2.16 4/30/20254,950,000 shares $13.12 million +14.9%N/A2.9 $2.65 4/15/20254,310,000 shares $9.48 million +21.4%7.9%2.9 $2.20 Get the Latest News and Ratings for ALDX and Related StocksEnter your email address below to receive the latest news and analysts' ratings for Aldeyra Therapeutics and its competitors with MarketBeat's FREE daily newsletter. 3/31/20253,550,000 shares $20.41 million -11.0%6.5%2.8 $5.75 3/15/20253,990,000 shares $27.57 million +10.5%7.3%8.2 $6.91 2/28/20253,610,000 shares $18.45 million -1.9%6.6%8.1 $5.11 2/15/20253,680,000 shares $23.88 million +0.3%6.8%9.3 $6.49 1/31/20253,670,000 shares $19.23 million -2.4%6.4%8.2 $5.24 1/15/20253,760,000 shares $18.91 million -2.1%N/A8.2 $5.03 12/31/20243,840,000 shares $19.16 million +8.2%N/A8.3 $4.99 12/15/20243,550,000 shares $17.40 million +4.1%N/A7.6 $4.90 11/30/20243,410,000 shares $16.71 million -12.3%N/A7.2 $4.90 11/15/20243,890,000 shares $16.38 million +6.0%N/A7.9 $4.21 10/31/20243,670,000 shares $19.30 million +7.9%6.4%8.3 $5.26 10/15/20243,400,000 shares $18.22 million +13.3%5.9%6.4 $5.36 9/30/20243,000,000 shares $16.17 million +0.7%5.2%5.9 $5.39 9/15/20242,980,000 shares $17.97 million -4.2%5.2%5.9 $6.03 8/31/20243,110,000 shares $17.90 million +6.5%5.4%6.3 $5.76 8/15/20242,920,000 shares $15.33 million +14.1%5.1%6.4 $5.25 7/31/20242,560,000 shares $10.09 million -5.5%N/A6 $3.94 7/15/20242,710,000 shares $10.73 million +6.7%N/A7.9 $3.96 6/30/20242,540,000 shares $8.41 million +4.5%N/A6.4 $3.31 6/15/20242,430,000 shares $9.06 million +3.4%N/A5.1 $3.73 5/31/20242,350,000 shares $9.07 million -0.4%N/A4.6 $3.86 5/15/20242,360,000 shares $9.84 million +1.7%N/A4.3 $4.17 4/30/20242,320,000 shares $9.14 million -1.7%4.0%4.1 $3.94 4/15/20242,360,000 shares $9.82 million +15.1%4.2%4 $4.16 3/31/20242,050,000 shares $6.70 million +12.0%3.6%3.5 $3.27 3/15/20241,830,000 shares $5.11 million -5.7%3.2%3.4 $2.79 2/29/20241,940,000 shares $7.02 million +0.5%3.4%2.2 $3.62 2/15/20241,930,000 shares $6.95 million -4.0%3.4%2 $3.60 1/31/20242,010,000 shares $6.29 million -8.6%3.6%1.7 $3.13 1/15/20242,200,000 shares $7.06 million -3.1%3.9%0.9 $3.21 12/31/20232,270,000 shares $7.97 million -36.1%4.0%0.8 $3.51 12/15/20233,550,000 shares $10.72 million +6.9%6.3%1.2 $3.02 11/30/20233,320,000 shares $9.20 million +5.1%5.9%1.3 $2.77 11/15/20233,160,000 shares $7.96 million -5.7%5.6%1.3 $2.52 10/31/20233,350,000 shares $5.73 million -49.7%6.0%1.4 $1.71 10/15/20236,660,000 shares $36.16 million +7.9%11.8%6.2 $5.43 9/30/20236,170,000 shares $41.22 million -4.3%11.0%11 $6.68 9/15/20236,450,000 shares $42.12 million +5.9%11.5%10 $6.53 8/31/20236,090,000 shares $45.43 million -3.9%10.7%5.5 $7.46 8/15/20236,340,000 shares $49.83 million -6.8%11.1%5.4 $7.86 7/31/20236,800,000 shares $55.18 million +9.3%12.0%5.7 $8.12 7/15/20236,220,000 shares $48.76 million -6.5%10.9%5 $7.84 6/30/20236,650,000 shares $55.79 million +111.1%11.7%5 $8.39 6/15/20233,150,000 shares $34.24 million -6.5%5.5%2.3 $10.87 5/31/20233,370,000 shares $31.98 million -9.4%5.9%3.6 $9.49 5/15/20233,720,000 shares $37.98 million +51.8%6.5%4.4 $10.21 4/30/20232,450,000 shares $23.35 million -6.5%4.3%3 $9.53 4/15/20232,620,000 shares $27.35 million -13.3%4.7%3.5 $10.44 3/31/20233,020,000 shares $29.99 million +45.2%5.4%4.6 $9.93 3/15/20232,080,000 shares $16.24 million +4.5%3.7%4.4 $7.81 2/28/20231,990,000 shares $13.45 million -9.1%3.6%5.2 $6.76 2/15/20232,190,000 shares $14.04 million +8.4%3.9%5.9 $6.41 1/31/20232,020,000 shares $11.92 million +19.5%3.6%5.7 $5.90 1/15/20231,690,000 shares $10.90 million -10.1%3.0%5 $6.45 12/30/20221,880,000 shares $13.08 million -0.5%3.4%5.3 $6.96 12/15/20221,890,000 shares $11.76 million -2.6%3.4%5.2 $6.22 11/30/20221,940,000 shares $10.86 million -3.0%3.5%5.3 $5.60 11/15/20222,000,000 shares $11.34 million -8.3%3.6%5.4 $5.67 10/31/20222,180,000 shares $11.90 million -4.0%3.9%5 $5.46 10/15/20222,270,000 shares $11.80 million -23.3%4.1%4.2 $5.20 9/30/20222,960,000 shares $15.81 million +12.6%5.3%4.2 $5.34 9/15/20222,630,000 shares $17.33 million -14.3%4.7%3.1 $6.59 8/31/20223,070,000 shares $21.61 million -2.2%5.5%3 $7.04 8/15/20223,140,000 shares $22.83 million +3.0%5.6%3 $7.27 7/31/20223,050,000 shares $15.37 million -9.8%5.5%2.8 $5.04 7/15/20223,380,000 shares $15.95 million +19.0%6.1%3.2 $4.72 6/30/20222,840,000 shares $11.33 million -29.2%5.1%3.1 $3.99 6/15/20224,010,000 shares $13.51 million +17.9%7.1%4.2 $3.37 5/31/20223,400,000 shares $10.51 million +17.2%6.1%3.8 $3.09 5/15/20222,900,000 shares $7.22 million -0.3%5.2%3.5 $2.49 4/30/20222,910,000 shares $8.93 million +8.2%5.2%3.3 $3.07 4/15/20222,690,000 shares $12.27 million +7.6%4.8%3.1 $4.56 3/31/20222,500,000 shares $11.13 million -19.4%4.5%2.7 $4.45 3/15/20223,100,000 shares $11.94 million -5.5%5.5%2.4 $3.85 2/28/20223,280,000 shares $13.25 million -13.2%5.8%2.6 $4.04 2/15/20223,780,000 shares $15.99 million +22.7%6.6%3 $4.23 1/31/20223,080,000 shares $11.30 million +19.8%5.4%2.5 $3.67 1/15/20222,570,000 shares $9.71 million +0.4%4.5%2.2 $3.78 12/31/20212,560,000 shares $10.24 million -24.3%4.5%2.3 $4.00 12/15/20213,380,000 shares $24.00 million -2.0%5.9%3.3 $7.10 11/30/20213,450,000 shares $26.46 million -0.9%6.1%5.6 $7.67 11/15/20213,480,000 shares $30.14 million -9.4%6.1%6.2 $8.66 10/29/20213,840,000 shares $34.94 million +2.7%6.8%6.7 $9.10 10/15/20213,740,000 shares $31.19 million -3.4%6.6%7.2 $8.34 9/30/20213,870,000 shares $33.98 million -11.4%6.8%6.8 $8.78 9/15/20214,370,000 shares $37.36 million -10.3%7.7%6.4 $8.55 8/31/20214,870,000 shares $46.22 million -12.1%8.6%6.9 $9.49 8/13/20215,540,000 shares $51.47 million -9.8%9.8%7.3 $9.29 7/30/20216,140,000 shares $54.65 million +5.9%10.8%7.7 $8.90 7/15/20215,800,000 shares $56.20 million -4.5%10.3%2.4 $9.69 6/30/20216,070,000 shares $68.77 million +42.2%10.8%2.5 $11.33 6/15/20214,270,000 shares $51.41 million -1.6%7.6%1.9 $12.04 5/28/20214,340,000 shares $54.34 million -9.8%7.7%1.9 $12.52 5/14/20214,810,000 shares $58.25 million -4.4%N/A2.1 $12.11 4/30/20215,030,000 shares $62.90 million +7.7%N/A2.1 $12.51 4/15/20214,670,000 shares $54.87 million -2.3%N/A5.4 $11.75 3/31/20214,780,000 shares $54.40 million +151.6%N/A4.1 $11.38 3/15/20211,900,000 shares $23.79 million +5.6%N/A1.6 $12.52 2/26/20211,800,000 shares $21.06 million +4.1%N/A1.6 $11.70 2/12/20211,730,000 shares $20.47 million -11.3%N/A1.6 $11.83 1/29/20211,950,000 shares $21.78 million -2.0%N/A2.1 $11.17 1/15/20211,990,000 shares $24.25 million -10.4%N/A2.4 $12.19 12/31/20202,220,000 shares $15.21 million +49.0%N/A3.5 $6.85 12/15/20201,490,000 shares $10.16 million -3.9%N/A3.1 $6.82 11/30/20201,550,000 shares $10.76 million -3.1%N/A3 $6.94 11/15/20201,600,000 shares $10.75 million +1.9%N/A3 $6.72 10/30/20201,570,000 shares $9.91 million -4.9%N/A2.7 $6.31 10/15/20201,650,000 shares $11.32 million -2.9%N/A2.4 $6.86 9/30/20201,700,000 shares $12.60 million +57.4%N/A2 $7.41 ALDX Short Interest - Frequently Asked Questions What is Aldeyra Therapeutics' current short interest? Short interest is the volume of Aldeyra Therapeutics shares that have been sold short but have not yet been covered or closed out. As of August 31st, traders have sold 5,290,000 shares of ALDX short. 9.77% of Aldeyra Therapeutics' shares are currently sold short. Learn More on Aldeyra Therapeutics' current short interest. What is a good short interest ratio for Aldeyra Therapeutics? 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. ALDX shares currently have a short interest ratio of 5.0. Learn More on Aldeyra Therapeutics's short interest ratio. Which institutional investors are shorting Aldeyra Therapeutics? As of the most recent reporting period, the following institutional investors, funds, and major shareholders have reported short positions of Aldeyra Therapeutics: Exome Asset Management LLC, Group One 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 Aldeyra Therapeutics? 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. 9.77% of Aldeyra Therapeutics' floating shares are currently sold short. Is Aldeyra Therapeutics' short interest increasing or decreasing? Aldeyra Therapeutics saw a increase in short interest during the month of August. As of August 31st, there was short interest totaling 5,290,000 shares, an increase of 6.0% from the previous total of 4,990,000 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. How does Aldeyra Therapeutics' short interest compare to its competitors? 9.77% of Aldeyra Therapeutics' shares are currently sold short. Here is how the short interest of companies in the industry of "pharmaceutical products" compare to Aldeyra Therapeutics: Stoke Therapeutics, Inc. (21.66%), Tilray Brands, Inc. (14.80%), Evotec AG (0.21%), Arcus Biosciences, Inc. (15.02%), Intellia Therapeutics, Inc. (26.67%), Tourmaline Bio, Inc. (15.93%), Pharvaris N.V. (1.70%), Xeris Biopharma Holdings, Inc. (9.74%), Structure Therapeutics Inc. Sponsored ADR (12.28%), CureVac N.V. (0.89%), 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 ($73.23 billion), Invesco QQQ ($29.52 billion), iShares Russell 2000 ETF ($20.82 billion), iShares 20+ Year Treasury Bond ETF ($10.76 billion), Palo Alto Networks, Inc. ($9.37 billion), Strategy Inc ($7.58 billion), Invesco S&P 500 Equal Weight ETF ($6.78 billion), SPDR S&P Biotech ETF ($6.72 billion), AppLovin Corporation ($6.37 billion), and iShares iBoxx $ Investment Grade Corporate Bond ETF ($6.29 billion). View all of the most shorted stocks. What does it mean to sell short Aldeyra Therapeutics stock? Short selling ALDX is an investing strategy that aims to generate trading profit from Aldeyra Therapeutics as its price is falling. ALDX shares are trading down $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 Aldeyra Therapeutics? A short squeeze for Aldeyra Therapeutics 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 ALDX, which in turn drives the price of the stock up even further. How often is Aldeyra Therapeutics' 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 ALDX, twice per month. The most recent reporting period available is August, 31 2025. More Short Interest Resources from MarketBeat Related Companies Stoke Therapeutics Short Interest Data Tilray Brands Short Interest Data Evotec Short Interest Data Arcus Biosciences Short Interest Data Intellia Therapeutics Short Interest Data Tourmaline Bio Short Interest Data Pharvaris Short Interest Data Xeris Biopharma Short Interest Data Structure Therapeutics Short Interest Data CureVac 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:ALDX) was last updated on 9/20/2025 by MarketBeat.com Staff From Our PartnersHe Called Nvidia at $1.10. Now, He Says THIS Stock Will…The original Magnificent Seven returned 16,894%—turning $7K into $1.18 million. 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