Stock listing
NASDAQ:ALDX Aldeyra Therapeutics, Inc. Stock
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Share price · NASDAQ:ALDX
$0.665 USD -0.035 (-5.0%)
Close on Oct 19, 2026
- Day range
- $0.656 – $0.720 USDOct 19, 2026
- Volume
- 861,032 sharesOct 19, 2026
- Market value
- $40.13M USDAt the close on Oct 19, 2026 · price × 60.34M shares outstanding
- 52-week range
- $0.650 – $5.930 USDLowest and highest trades, Oct 20, 2025 – Oct 19, 2026
Prices by listing
| Listing | Last | Change | Volume | Open | High | Low | Previous close | Price from |
|---|---|---|---|---|---|---|---|---|
| NASDAQ:ALDX · Home | $0.665 USD | -0.035 (-5.0%) | 861,032 | $0.704 | $0.720 | $0.656 | $0.700 | Close on Oct 19, 2026 |
| Frankfurt:137 | €0.595 EUR | -0.010 (-1.7%) | — | €0.620 | €0.620 | €0.595 | €0.605 | Close on Oct 19, 2026 |
Daily closes
Last 3 months, Jul 20, 2026 – Oct 19, 2026 · NASDAQ:ALDX · USD, adjusted for splits
| Day | Close | Change | % | Open | High | Low | Volume |
|---|---|---|---|---|---|---|---|
| $0.665 | -0.035 | -5.0% | $0.704 | $0.720 | $0.656 | 861,032 | |
| $0.700 | -0.037 | -5.0% | $0.740 | $0.740 | $0.650 | 1,810,462 | |
| $0.737 | -0.053 | -6.7% | $0.770 | $0.803 | $0.725 | 1,233,461 | |
| $0.790 | -0.110 | -12.2% | $0.880 | $0.899 | $0.789 | 1,578,462 | |
| $0.900 | -0.006 | -0.7% | $0.890 | $0.910 | $0.865 | 1,456,500 | |
| $0.906 | -0.010 | -1.1% | $0.920 | $0.940 | $0.882 | 1,340,300 | |
| $0.916 | -0.032 | -3.4% | $0.940 | $0.970 | $0.915 | 699,000 | |
| $0.948 | -0.011 | -1.1% | $0.960 | $0.970 | $0.912 | 1,178,300 | |
| $0.959 | +0.043 | +4.7% | $0.910 | $0.967 | $0.881 | 1,287,000 | |
| $0.916 | -0.008 | -0.9% | $0.950 | $0.990 | $0.862 | 8,232,300 | |
| $0.924 | -0.246 | -21.0% | $1.180 | $1.185 | $0.898 | 7,026,300 | |
| $1.170 | -0.120 | -9.3% | $1.310 | $1.310 | $1.150 | 2,269,900 | |
| $1.290 | +0.060 | +4.9% | $1.260 | $1.305 | $1.195 | 1,211,300 | |
| $1.230 | -0.090 | -6.8% | $1.340 | $1.350 | $1.220 | 1,650,600 | |
| $1.320 | +0.160 | +13.8% | $1.170 | $1.440 | $1.160 | 5,448,800 | |
| $1.160 | -0.045 | -3.7% | $1.180 | $1.220 | $1.150 | 1,019,700 | |
| $1.205 | -0.015 | -1.2% | $1.230 | $1.280 | $1.195 | 644,700 | |
| $1.220 | -0.130 | -9.6% | $1.350 | $1.350 | $1.220 | 835,100 | |
| $1.350 | -0.045 | -3.2% | $1.400 | $1.400 | $1.330 | 630,100 | |
| $1.395 | +0.045 | +3.3% | $1.370 | $1.400 | $1.351 | 428,600 | |
| $1.350 | -0.010 | -0.7% | $1.370 | $1.390 | $1.320 | 494,800 | |
| $1.360 | -0.020 | -1.4% | $1.400 | $1.400 | $1.345 | 366,900 | |
| $1.380 | +0.010 | +0.7% | $1.390 | $1.435 | $1.370 | 394,900 | |
| $1.370 | 0.000 | 0.0% | $1.380 | $1.400 | $1.355 | 791,900 | |
| $1.370 | -0.090 | -6.2% | $1.450 | $1.450 | $1.345 | 833,000 | |
| $1.460 | +0.120 | +9.0% | $1.350 | $1.490 | $1.348 | 1,167,300 | |
| $1.340 | -0.120 | -8.2% | $1.480 | $1.480 | $1.330 | 1,565,400 | |
| $1.460 | -0.040 | -2.7% | $1.480 | $1.505 | $1.460 | 552,100 | |
| $1.500 | -0.040 | -2.6% | $1.530 | $1.535 | $1.495 | 544,000 | |
| $1.540 | +0.060 | +4.1% | $1.470 | $1.550 | $1.470 | 720,600 | |
| $1.480 | 0.000 | 0.0% | $1.470 | $1.490 | $1.460 | 483,900 | |
| $1.480 | -0.010 | -0.7% | $1.480 | $1.511 | $1.460 | 568,900 | |
| $1.490 | 0.000 | 0.0% | $1.510 | $1.540 | $1.460 | 498,200 | |
| $1.490 | +0.010 | +0.7% | $1.460 | $1.500 | $1.455 | 461,700 | |
| $1.480 | -0.005 | -0.3% | $1.510 | $1.510 | $1.465 | 495,100 | |
| $1.485 | -0.055 | -3.6% | $1.520 | $1.560 | $1.480 | 548,000 | |
| $1.540 | -0.020 | -1.3% | $1.570 | $1.581 | $1.525 | 277,000 | |
| $1.560 | +0.010 | +0.6% | $1.540 | $1.575 | $1.520 | 478,400 | |
| $1.550 | +0.030 | +2.0% | $1.520 | $1.560 | $1.500 | 447,000 | |
| $1.520 | 0.000 | 0.0% | $1.530 | $1.545 | $1.460 | 531,900 | |
| $1.520 | +0.020 | +1.3% | $1.500 | $1.595 | $1.475 | 1,098,700 | |
| $1.500 | -0.080 | -5.1% | $1.570 | $1.575 | $1.495 | 942,900 | |
| $1.580 | +0.030 | +1.9% | $1.590 | $1.600 | $1.540 | 982,200 | |
| $1.550 | -0.010 | -0.6% | $1.540 | $1.595 | $1.505 | 702,800 | |
| $1.560 | 0.000 | 0.0% | $1.550 | $1.580 | $1.525 | 789,800 | |
| $1.560 | +0.120 | +8.3% | $1.490 | $1.570 | $1.445 | 831,000 | |
| $1.440 | -0.080 | -5.3% | $1.530 | $1.570 | $1.440 | 1,357,000 | |
| $1.520 | +0.010 | +0.7% | $1.510 | $1.580 | $1.500 | 939,400 | |
| $1.510 | 0.000 | 0.0% | $1.530 | $1.540 | $1.500 | 473,993 | |
| $1.510 | -0.040 | -2.6% | $1.550 | $1.565 | $1.510 | 867,622 | |
| $1.550 | -0.040 | -2.5% | $1.560 | $1.615 | $1.525 | 1,171,200 | |
| $1.590 | -0.010 | -0.6% | $1.600 | $1.615 | $1.530 | 579,200 | |
| $1.600 | +0.050 | +3.2% | $1.550 | $1.630 | $1.550 | 822,600 | |
| $1.550 | +0.020 | +1.3% | $1.520 | $1.600 | $1.500 | 975,500 | |
| $1.530 | -0.010 | -0.6% | $1.550 | $1.550 | $1.490 | 784,800 | |
| $1.540 | -0.060 | -3.8% | $1.620 | $1.630 | $1.520 | 576,800 | |
| $1.600 | -0.010 | -0.6% | $1.630 | $1.670 | $1.595 | 548,900 | |
| $1.610 | +0.030 | +1.9% | $1.580 | $1.630 | $1.530 | 745,400 | |
| $1.580 | -0.005 | -0.3% | $1.620 | $1.620 | $1.490 | 916,800 | |
| $1.585 | +0.065 | +4.3% | $1.530 | $1.610 | $1.530 | 1,232,100 | |
| $1.520 | -0.030 | -1.9% | $1.600 | $1.600 | $1.475 | 1,126,300 | |
| $1.550 | -0.150 | -8.8% | $1.700 | $1.720 | $1.540 | 1,414,500 | |
| $1.700 | -0.050 | -2.9% | $1.750 | $1.755 | $1.660 | 1,086,600 | |
| $1.750 | +0.050 | +2.9% | $1.710 | $1.780 | $1.690 | 1,107,700 | |
| $1.700 | +0.010 | +0.6% | $1.700 | $1.760 | $1.650 | 1,130,900 |
- Ticker
- NASDAQ:ALDX
- Asset type
- Stock
- Sector
- Health care
- Industry
- Biotechnology
- Exchange
- NASDAQ
- Currency
- USD
What changed lately
Latest news release · Sep 29, 2026
Aldeyra Therapeutics Announces Intent to Submit Formal Dispute Resolution Request for Reproxalap to Treat Dry Eye Disease
Latest deck · Sep 29, 2026
Corporate Update (September 2026)
Corporate update · 11 slides
Calls
Replays
Aldeyra Therapeutics (NASDAQ:ALDX) Q2 2025 Earnings Call
Tue, May 06, 2025 · 8:00 AM ET
Watch TranscriptAldeyra Therapeutics (NASDAQ:ALDX) Q4 2022 Earnings Call
Thu, Mar 09, 2023 · 8:00 AM ET
Watch TranscriptAldeyra Therapeutics (NASDAQ:ALDX) Q3 2022 Earnings Call
Thu, Nov 10, 2022 · 8:00 AM ET
Watch Transcript
Latest news
Aldeyra Therapeutics Announces Intent to Submit Formal Dispute Resolution Request for Reproxalap to Treat Dry Eye Disease
Sep 29, 2026
Closed $1.32 (+13.8%) on Sep 29, 2026
Aldeyra Therapeutics to Host Regulatory Update Webcast
Sep 28, 2026
Closed $1.32 (+13.8%) on Sep 29, 2026
Aldeyra Therapeutics Appoints Darlene Deptula-Hicks to Board of Directors
Jun 9, 2026
Closed $1.69 (-1.7%) on Jun 10, 2026
Aldeyra Therapeutics to Participate in the 2026 Jefferies Global Healthcare Conference
Jun 2, 2026
Closed $1.64 (-1.2%) on Jun 2, 2026
Aldeyra Therapeutics to Participate in the Oppenheimer 36th Annual Healthcare Life Sciences Conference
Feb 18, 2026
Closed $5.02 (-2.5%) on Feb 18, 2026
Aldeyra Therapeutics Announces PDUFA Extension of the New Drug Application of Reproxalap for the Treatment of Dry Eye Disease
Dec 15, 2025
Closed $5.31 (+33.1%) on Dec 16, 2025
Aldeyra Therapeutics Announces Expansion of RASP Platform to Include Central Nervous System Diseases and Provides Updates on Reproxalap at Research & Development Webcast
Nov 13, 2025
Closed $5.02 (-5.3%) on Nov 13, 2025
Aldeyra Therapeutics to Participate in the Jefferies Global Healthcare Conference in London
Nov 11, 2025
Closed $5.23 (+1.9%) on Nov 11, 2025
Aldeyra Therapeutics to Host Research & Development Update Webcast Event Scheduled for Thursday, November 13 at 8: 00 a.m. ET
Nov 6, 2025
Closed $4.81 (-2.4%) on Nov 6, 2025
Decks
Corporate Update (September 2026)
Corporate update · 11 slides · Sep 29, 2026
Investor Presentation (May 2026)
Investor deck · 29 slides · May 1, 2026
Technical Presentation (April 2026)
Technical · 12 slides · Apr 10, 2026
Technical Presentation (April 2026)
Technical · 9 slides · April 2026
Aldeyra Therapeutics, Inc. on 6ix
- Sector
- Health care
- Industry
- Biotechnology
- News releases
- 10 in the last 12 months · 162 in all · newest Sep 29, 2026 · oldest 2019
- Calls
- 11 calls with a replay · 11 with a transcript · latest May 6, 2025
- Decks
- 51 decks · latest Sep 29, 2026
Where Aldeyra Therapeutics, Inc. is listed
| Listing | Exchange | Country | Currency |
|---|---|---|---|
| NASDAQ:ALDX · Home listing · This page | NASDAQ | United States | USD |
| BOATS:ALDX | BOATS | United States | USD |
| LS Exchange:A111X8 | LS Exchange | Germany | EUR |
| gettex:137 | gettex | Germany | EUR |
| Lang & Schwarz:A111X8 | Lang & Schwarz | Germany | EUR |
| Frankfurt:137 | Frankfurt | Germany | EUR |
| Tradegate:137 | Tradegate | Germany | EUR |
| Dusseldorf:137 | Dusseldorf | Germany | EUR |
| Munich:137 | Munich | Germany | EUR |
| Stuttgart:137 | Stuttgart | Germany | EUR |
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