Aldeyra Therapeutics (ALDX) Stock Chart & Stock Price History $5.77 -0.04 (-0.69%) Closing price 04:00 PM EasternExtended Trading$5.76 0.00 (-0.09%) As of 06:18 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 Chart Stock AnalysisAnalyst ForecastsChartCompetitorsEarningsFDA EventsHeadlinesInsider TradesOptions ChainOwnershipSEC FilingsShort InterestTrendsBuy This Stock Aldeyra Therapeutics Stock Price Performance The Aldeyra Therapeutics (ALDX) stock chart highlights key performance trends across multiple timeframes. Over the last 12 months, the stock's price has increased 3.59%, with a year-to-date return of 15.63%. In the past month, the stock has increased 11.61%, reflecting recent market activity. As of the latest close, Aldeyra Therapeutics traded at $5.81 with a market cap of $348.02 million and volume of 1.03 million shares. Five years ago, the stock traded at $6.96, representing a 17.10% decrease over that period. At the time, it had a market cap of $283.57 million and a volume of 468,850 shares. Receive ALDX Stock News and Ratings via EmailSign-up to receive the latest news and ratings for Aldeyra Therapeutics and its competitors with MarketBeat's FREE daily newsletter. Email Address 5 Day Performance+2.49%1 Month Performance+11.61%3 Month Performance+159.91%Year-To-Date Performance+15.63%1 Year Performance+3.59%5 Year Performance-17.10% ALDX Stock Chart for Monday, August, 25, 2025 ALDX Chart by TradingView Aldeyra Therapeutics Stock Price History Daily Weekly Monthly Yearly Time Frame Custom Range 1 Month 3 Months 6 Months Year-to-Date 1 Year 3 Year 5 Year Time Frame Start Date End Date Export to Excel DateOpening PriceClosing PriceHighLowVolumeMarket Capitalization08/25/2025$5.81$5.77-0.69%$5.89$5.68561,887 shs$345.62 million08/22/2025$5.88$5.81-1.19%$6.05$5.661.03 million shs$348.02 million08/21/2025$5.63$5.88+4.44%$5.97$5.56882,424 shs$352.19 million08/20/2025$5.60$5.63+0.54%$5.68$5.50501,323 shs$337.24 million08/19/2025$5.44$5.60+2.94%$5.73$5.341.18 million shs$335.44 million08/18/2025$5.39$5.44+0.93%$5.65$5.38739,002 shs$325.83 million08/15/2025$5.30$5.39+1.70%$5.40$5.25912,262 shs$322.86 million08/14/2025$5.37$5.30-1.30%$5.41$5.21574,585 shs$317.45 million08/13/2025$5.36$5.37+0.19%$5.49$5.28868,933 shs$321.66 million08/12/2025$5.25$5.36+2.10%$5.49$5.27830,529 shs$321.06 million 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. 08/11/2025$5.26$5.25-0.19%$5.37$5.041.03 million shs$314.45 million08/08/2025$5.17$5.26+1.74%$5.32$4.991.31 million shs$315.05 million08/07/2025$5.22$5.17-0.96%$5.31$5.08606,510 shs$309.68 million08/06/2025$5.16$5.22+1.16%$5.29$5.05711,714 shs$312.68 million08/05/2025$5.08$5.16+1.57%$5.23$4.991.27 million shs$309.06 million08/04/2025$4.81$5.08+5.61%$5.23$4.801.04 million shs$304.29 million08/01/2025$4.99$4.81-3.61%$4.92$4.231.51 million shs$288.12 million07/31/2025$5.05$4.99-1.19%$5.15$4.94779,965 shs$298.90 million07/30/2025$5.09$5.05-0.79%$5.35$5.00964,879 shs$302.48 million07/29/2025$5.32$5.09-4.32%$5.32$5.021.22 million shs$304.89 million07/28/2025$5.17$5.32+2.90%$5.37$5.12904,734 shs$318.67 million07/25/2025$5.44$5.17-4.96%$5.47$5.131.75 million shs$309.68 million07/24/2025$5.53$5.44-1.63%$5.62$5.39979,812 shs$325.83 million Related Companies PAHC Stock Chart XERS Stock Chart CVAC Stock Chart ELVN Stock Chart CALT Stock Chart COLL Stock Chart NTLA Stock Chart PHVS Stock Chart GPCR Stock Chart TLRY Stock Chart Receive ALDX Stock News and Ratings via EmailSign-up to receive the latest news and ratings for Aldeyra Therapeutics and its competitors with MarketBeat's FREE daily newsletter. 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