Aldeyra Therapeutics (ALDX) Stock Chart & Stock Price History $5.39 -0.28 (-4.94%) Closing price 04:00 PM EasternExtended Trading$5.35 -0.04 (-0.74%) As of 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 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 1.32%, with a year-to-date return of 8.02%. In the past month, the stock has decreased 2.71%, reflecting recent market activity. As of the latest close, Aldeyra Therapeutics traded at $5.67 with a market cap of $339.61 million and volume of 676,678 shares. Five years ago, the stock traded at $7.05, representing a 23.55% decrease over that period. At the time, it had a market cap of $272.36 million and a volume of 180,447 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. Subscribe Now 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. 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Read our full terms of service and privacy policy. 5 Day Performance-6.10%1 Month Performance-2.71%3 Month Performance+12.29%Year-To-Date Performance+8.02%1 Year Performance+1.32%5 Year Performance-23.55% ALDX Stock Chart for Friday, October, 10, 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 Capitalization10/10/2025$5.67$5.39-4.94%$5.71$5.36980,965 shs$322.86 million10/09/2025$5.62$5.67+0.89%$5.78$5.64676,678 shs$339.61 million10/08/2025$5.61$5.62+0.18%$5.77$5.45923,269 shs$336.64 million10/07/2025$5.51$5.61+1.81%$5.66$5.44647,372 shs$336.04 million10/06/2025$5.74$5.51-4.01%$5.78$5.37705,224 shs$330.03 million10/03/2025$5.32$5.74+7.89%$5.75$5.281.03 million shs$343.80 million10/02/2025$5.24$5.32+1.53%$5.36$5.18410,788 shs$318.67 million10/01/2025$5.22$5.24+0.38%$5.43$5.17411,371 shs$313.88 million09/30/2025$5.21$5.22+0.19%$5.23$5.13397,513 shs$312.66 million09/29/2025$5.07$5.21+2.76%$5.31$5.13501,632 shs$312.08 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. 09/26/2025$4.95$5.07+2.42%$5.13$4.91590,317 shs$303.69 million09/25/2025$5.01$4.95-1.20%$5.01$4.86421,457 shs$296.51 million09/24/2025$5.11$5.01-1.96%$5.26$4.98558,700 shs$300.08 million09/23/2025$4.95$5.11+3.23%$5.16$4.93672,116 shs$306.09 million09/22/2025$4.93$4.95+0.41%$5.01$4.88860,156 shs$296.51 million09/19/2025$5.01$4.93-1.60%$5.05$4.781.50 million shs$295.31 million09/18/2025$4.90$5.01+2.24%$5.11$4.94746,503 shs$300.08 million09/17/2025$4.96$4.90-1.21%$5.11$4.88845,889 shs$293.51 million09/16/2025$5.09$4.96-2.55%$5.23$4.94796,478 shs$297.10 million09/15/2025$5.39$5.09-5.57%$5.43$4.961.60 million shs$304.87 million09/12/2025$5.56$5.39-3.06%$5.62$5.38661,019 shs$322.84 million09/11/2025$5.54$5.56+0.36%$5.83$5.49734,932 shs$333.04 million09/10/2025$5.76$5.54-3.82%$5.88$5.48612,468 shs$331.85 million09/09/2025$5.70$5.76+1.05%$5.77$5.621.01 million shs$345.00 million Related Companies SNDX Stock Chart SION Stock Chart XERS Stock Chart TSHA Stock Chart ZYME Stock Chart NUVB Stock Chart ARDX Stock Chart AMPH Stock Chart TRML Stock Chart PHVS 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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