Aldeyra Therapeutics (ALDX) Short Interest Ratio & Short Volume $5.54 -0.22 (-3.75%) As of 03:30 PM Eastern This is a fair market value 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 4.99 million shares. This marks a -0.80% decrease in short interest from the previous month. The short interest ratio (days to cover) is 4.9, indicating that it would take 4.9 days of the average trading volume of 1.16 million shares to cover all short positions.Current Short Interest4,990,000 sharesPrevious Short Interest5,030,000 sharesChange Vs. Previous Month-0.80%Dollar Volume Sold Short$26.90 millionShort Interest Ratio4.9 Days to CoverLast Record DateAugust 15, 2025Outstanding Shares59,900,000 sharesPercentage of Shares Shorted8.33%Today's Trading Volume387,377 sharesAverage Trading Volume1,158,984 sharesToday's Volume Vs. Average33% 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. Message and data rates may apply. Message frequency will vary. Messages will consist of stock alerts, news stories, and partner advertisements/offers. Consent is not a condition of the purchase of any goods or services. Text HELP for help/customer support. 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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 8/15/20254,990,000 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 3/31/20253,550,000 shares $20.41 million -11.0%6.5%2.8 $5.75 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. 3/15/20253,990,000 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 9/15/20201,080,000 shares $7.56 million +32.1%N/A1 $7.00 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 closed out or covered. As of August 15th, traders have sold 4,990,000 shares of ALDX 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. Is Aldeyra Therapeutics' short interest increasing or decreasing? Aldeyra Therapeutics saw a drop in short interest during the month of August. As of August 15th, there was short interest totaling 4,990,000 shares, a drop of 0.8% from the previous total of 5,030,000 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? Here is how the short interest of companies in the industry of "pharmaceutical products" compare to Aldeyra Therapeutics: Vera Therapeutics, Inc. (16.01%), Cogent Biosciences, Inc. (11.43%), Janux Therapeutics, Inc. (14.97%), Precigen, Inc. (20.94%), 89BIO (10.53%), Xeris Biopharma Holdings, Inc. (8.27%), AbCellera Biologics Inc. (18.53%), Evotec AG (0.20%), Collegium Pharmaceutical, Inc. (14.47%), Intellia Therapeutics, Inc. (25.83%), Which stocks are the most shorted right now? As of the most recent reporting period, the following stocks had the largest short interest positions: Lucid Group, Inc. ($8.00 billion), Spotify Technology ($5.48 billion), AppLovin Corporation ($5.11 billion), Reddit Inc. ($5.02 billion), Coinbase Global, Inc. ($3.99 billion), Charter Communications, Inc. ($3.89 billion), Live Nation Entertainment, Inc. ($3.18 billion), Seagate Technology Holdings PLC ($2.59 billion), ResMed Inc. ($2.55 billion), and Rocket Lab Corporation ($2.52 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 $0.23 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 increases 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, 15 2025. More Short Interest Resources from MarketBeat Related Companies Vera Therapeutics Short Interest Data Cogent Biosciences Short Interest Data Janux Therapeutics Short Interest Data Precigen Short Interest Data 89BIO Short Interest Data Xeris Biopharma Short Interest Data AbCellera Biologics Short Interest Data Evotec Short Interest Data Collegium Pharmaceutical Short Interest Data Intellia 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:ALDX) was last updated on 9/10/2025 by MarketBeat.com Staff From Our PartnersWorld War 3? 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