Aldeyra Therapeutics Stock Price History
NASDAQ: ALDXHealth CareBiotechnology: Pharmaceutical PreparationsUSD
0.9163-0.0314 (-3.31%)
At close: Oct 9, 4:00 PM ET · Delayed 15 min
ALDX price history at a glance
The price history for Aldeyra Therapeutics (ALDX) on this page begins on April 28, 2014, when the stock closed at $7.20; it most recently closed at $0.9163 on October 5, 2026. The highest price in this record is $16.70, reached on September 24, 2018; the latest close is 94.5% below that peak. Across the 11 complete calendar years in the table, ALDX finished higher in 5 and lower in 6. Its best year was 2022 (+74.0%) and its worst was 2023 (-49.6%).
Over roughly 12 years the share price changed -87.3%, a -15.3% compound annual price return (excluding dividends). In the last 12 months alone, ALDX has lost 83.8%. Prices are split-adjusted closing prices; daily open, high, low, close and volume for the past year are listed below.
Summary generated from market data by MetaCap's automated system. Methodology
Key price levels
- High since 2014
- $16.70
- Date of high
- Sep 24, 2018
- Low since 2014
- $0.862
- Date of low
- Oct 5, 2026
- 52-week high
- $5.93
- 52-week low
- $0.862
- IPO year
- 2014
- Last close
- $0.9163
ALDX returns
1 week
-21.68%
1 month
-38.91%
3 months
-55.73%
6 months
-48.52%
Year to date
-82.31%
1 year
-83.84%
3 years
-83.13%
5 years
-89.01%
ALDX price return, excluding dividends.
ALDX annual returns
| Year | Year-end close | Return |
|---|---|---|
| 2026 | 0.9163 | -80.38% |
| 2025 | 4.67 | -14.31% |
| 2024 | 5.45 | +55.27% |
| 2023 | 3.51 | -49.57% |
| 2022 | 6.96 | +74.00% |
| 2021 | 4.00 | -41.69% |
| 2020 | 6.86 | +16.67% |
| 2019 | 5.88 | -39.88% |
| 2018 | 9.78 | +43.82% |
| 2017 | 6.80 | +27.10% |
| 2016 | 5.35 | -21.09% |
| 2015 | 6.78 | -7.12% |
| 2014* | 7.30 | +1.39% |
* Partial year: the record begins after the start of 2014; return measured from the first available close.
2026 return is year to date.
ALDX daily prices (past year)
| Date | Open | High | Low | Close | Change |
|---|---|---|---|---|---|
| 0.9396 | 0.97 | 0.915 | 0.9163 | -3.31% | |
| 0.9597 | 0.97 | 0.9124 | 0.9477 | -1.14% | |
| 0.91 | 0.9666 | 0.8812 | 0.9586 | +4.65% | |
| 0.95 | 0.99 | 0.862 | 0.916 | -0.87% | |
| 1.18 | 1.19 | 0.898 | 0.924 | -21.03% | |
| 1.31 | 1.31 | 1.15 | 1.17 | -9.30% | |
| 1.26 | 1.31 | 1.20 | 1.29 | +4.88% | |
| 1.34 | 1.35 | 1.22 | 1.23 | -6.82% | |
| 1.17 | 1.44 | 1.16 | 1.32 | +13.79% | |
| 1.18 | 1.22 | 1.15 | 1.16 | -3.73% | |
| 1.23 | 1.28 | 1.20 | 1.21 | -1.23% | |
| 1.35 | 1.35 | 1.22 | 1.22 | -9.63% | |
| 1.40 | 1.40 | 1.33 | 1.35 | -3.23% | |
| 1.37 | 1.40 | 1.35 | 1.40 | +3.33% | |
| 1.37 | 1.39 | 1.32 | 1.35 | -0.74% | |
| 1.40 | 1.40 | 1.35 | 1.36 | -1.45% | |
| 1.39 | 1.44 | 1.37 | 1.38 | +0.73% | |
| 1.38 | 1.40 | 1.36 | 1.37 | 0.00% | |
| 1.45 | 1.45 | 1.35 | 1.37 | -6.16% | |
| 1.35 | 1.49 | 1.35 | 1.46 | +8.96% | |
| 1.48 | 1.48 | 1.33 | 1.34 | -8.22% | |
| 1.48 | 1.51 | 1.46 | 1.46 | -2.67% | |
| 1.53 | 1.54 | 1.50 | 1.50 | -2.60% | |
| 1.47 | 1.55 | 1.47 | 1.54 | +4.05% | |
| 1.47 | 1.49 | 1.46 | 1.48 | 0.00% | |
| 1.48 | 1.51 | 1.46 | 1.48 | -0.67% | |
| 1.51 | 1.54 | 1.46 | 1.49 | 0.00% | |
| 1.46 | 1.50 | 1.46 | 1.49 | +0.68% | |
| 1.51 | 1.51 | 1.47 | 1.48 | -0.34% | |
| 1.52 | 1.56 | 1.48 | 1.49 | -3.57% | |
| 1.57 | 1.58 | 1.53 | 1.54 | -1.28% | |
| 1.54 | 1.58 | 1.52 | 1.56 | +0.65% | |
| 1.52 | 1.56 | 1.50 | 1.55 | +1.97% | |
| 1.53 | 1.55 | 1.46 | 1.52 | 0.00% | |
| 1.50 | 1.60 | 1.48 | 1.52 | +1.33% | |
| 1.57 | 1.58 | 1.50 | 1.50 | -5.06% | |
| 1.59 | 1.60 | 1.54 | 1.58 | +1.94% | |
| 1.54 | 1.60 | 1.51 | 1.55 | -0.64% | |
| 1.55 | 1.58 | 1.53 | 1.56 | 0.00% | |
| 1.49 | 1.57 | 1.45 | 1.56 | +8.33% | |
| 1.53 | 1.57 | 1.44 | 1.44 | -5.26% | |
| 1.51 | 1.58 | 1.50 | 1.52 | +0.66% | |
| 1.53 | 1.54 | 1.50 | 1.51 | 0.00% | |
| 1.55 | 1.57 | 1.51 | 1.51 | -2.58% | |
| 1.56 | 1.62 | 1.53 | 1.55 | -2.52% | |
| 1.60 | 1.62 | 1.53 | 1.59 | -0.63% | |
| 1.55 | 1.63 | 1.55 | 1.60 | +3.23% | |
| 1.52 | 1.60 | 1.50 | 1.55 | +1.31% | |
| 1.55 | 1.55 | 1.49 | 1.53 | -0.65% | |
| 1.62 | 1.63 | 1.52 | 1.54 | -3.75% | |
| 1.63 | 1.67 | 1.60 | 1.60 | -0.62% | |
| 1.58 | 1.63 | 1.53 | 1.61 | +1.90% | |
| 1.62 | 1.62 | 1.49 | 1.58 | -0.32% | |
| 1.53 | 1.61 | 1.53 | 1.59 | +4.28% | |
| 1.60 | 1.60 | 1.48 | 1.52 | -1.94% | |
| 1.70 | 1.72 | 1.54 | 1.55 | -8.82% | |
| 1.75 | 1.76 | 1.66 | 1.70 | -2.86% | |
| 1.71 | 1.78 | 1.69 | 1.75 | +2.94% | |
| 1.70 | 1.76 | 1.65 | 1.70 | +0.59% | |
| 1.70 | 1.74 | 1.65 | 1.69 | -1.74% | |
| 1.84 | 1.85 | 1.60 | 1.72 | -10.42% | |
| 1.92 | 1.97 | 1.90 | 1.92 | -0.52% | |
| 1.95 | 1.98 | 1.90 | 1.93 | 0.00% | |
| 2.03 | 2.06 | 1.90 | 1.93 | -6.76% | |
| 2.28 | 2.29 | 2.06 | 2.07 | -10.00% | |
| 2.14 | 2.31 | 2.06 | 2.30 | +7.98% | |
| 2.22 | 2.24 | 2.07 | 2.13 | -4.48% | |
| 2.28 | 2.35 | 2.19 | 2.23 | -2.19% | |
| 2.25 | 2.36 | 2.21 | 2.28 | +0.44% | |
| 2.41 | 2.53 | 2.25 | 2.27 | -6.58% | |
| 2.13 | 2.53 | 2.11 | 2.43 | +14.08% | |
| 2.05 | 2.16 | 2.05 | 2.13 | +3.90% | |
| 1.84 | 2.09 | 1.82 | 2.05 | +12.02% | |
| 1.82 | 1.88 | 1.71 | 1.83 | +1.67% | |
| 1.94 | 1.96 | 1.76 | 1.80 | -5.26% | |
| 2.06 | 2.09 | 1.85 | 1.90 | -5.94% | |
| 2.00 | 2.21 | 2.00 | 2.02 | -1.46% | |
| 1.95 | 2.15 | 1.95 | 2.05 | +4.59% | |
| 1.87 | 1.99 | 1.87 | 1.96 | +7.10% | |
| 1.77 | 1.92 | 1.77 | 1.83 | +2.81% | |
| 1.77 | 1.84 | 1.75 | 1.78 | +1.14% | |
| 1.81 | 1.83 | 1.74 | 1.76 | 0.00% | |
| 1.71 | 1.78 | 1.70 | 1.76 | +2.92% | |
| 1.68 | 1.73 | 1.66 | 1.71 | +1.18% | |
| 1.71 | 1.80 | 1.65 | 1.69 | -1.74% | |
| 1.76 | 1.83 | 1.68 | 1.72 | -1.15% | |
| 1.83 | 1.97 | 1.73 | 1.74 | +6.75% | |
| 1.76 | 1.76 | 1.62 | 1.63 | -7.39% | |
| 1.86 | 1.93 | 1.75 | 1.76 | -5.38% | |
| 1.64 | 1.87 | 1.59 | 1.86 | +13.41% | |
| 1.67 | 1.69 | 1.58 | 1.64 | -1.20% | |
| 1.74 | 1.74 | 1.62 | 1.66 | -5.14% | |
| 1.74 | 1.75 | 1.67 | 1.75 | 0.00% | |
| 1.71 | 1.79 | 1.69 | 1.75 | +2.34% | |
| 1.75 | 1.78 | 1.68 | 1.71 | -3.93% | |
| 1.54 | 1.78 | 1.53 | 1.78 | +14.84% | |
| 1.57 | 1.62 | 1.53 | 1.55 | -2.52% | |
| 1.52 | 1.59 | 1.51 | 1.59 | +2.58% | |
| 1.54 | 1.57 | 1.51 | 1.55 | +0.65% | |
| 1.58 | 1.58 | 1.52 | 1.54 | -3.75% | |
| 1.67 | 1.69 | 1.58 | 1.60 | -4.76% | |
| 1.63 | 1.71 | 1.60 | 1.68 | +1.20% | |
| 1.71 | 1.71 | 1.64 | 1.66 | -2.35% | |
| 1.70 | 1.72 | 1.65 | 1.70 | -0.58% | |
| 1.75 | 1.81 | 1.70 | 1.71 | -2.84% | |
| 1.72 | 1.77 | 1.71 | 1.76 | +1.73% | |
| 1.70 | 1.77 | 1.70 | 1.73 | 0.00% | |
| 1.73 | 1.75 | 1.69 | 1.73 | -0.57% | |
| 1.70 | 1.86 | 1.69 | 1.74 | +1.16% | |
| 1.63 | 1.73 | 1.59 | 1.72 | +6.17% | |
| 1.57 | 1.68 | 1.57 | 1.62 | +1.89% | |
| 1.52 | 1.60 | 1.51 | 1.59 | +4.61% | |
| 1.51 | 1.60 | 1.49 | 1.52 | +1.33% | |
| 1.55 | 1.59 | 1.47 | 1.50 | -4.46% | |
| 1.57 | 1.62 | 1.56 | 1.57 | -0.63% | |
| 1.54 | 1.60 | 1.52 | 1.58 | +1.94% | |
| 1.58 | 1.59 | 1.51 | 1.55 | -3.13% | |
| 1.70 | 1.70 | 1.57 | 1.60 | -5.88% | |
| 1.68 | 1.71 | 1.65 | 1.70 | +1.19% | |
| 1.79 | 1.84 | 1.67 | 1.68 | -5.62% | |
| 1.79 | 1.82 | 1.75 | 1.78 | -1.11% | |
| 1.81 | 1.86 | 1.79 | 1.80 | 0.00% | |
| 1.82 | 1.83 | 1.71 | 1.80 | -1.64% | |
| 1.80 | 1.87 | 1.77 | 1.83 | +2.23% | |
| 1.80 | 1.89 | 1.75 | 1.79 | -0.56% | |
| 1.72 | 1.84 | 1.70 | 1.80 | +1.12% | |
| 1.60 | 1.81 | 1.60 | 1.78 | +11.95% | |
| 1.57 | 1.63 | 1.52 | 1.59 | +1.27% | |
| 1.59 | 1.62 | 1.55 | 1.57 | +3.29% | |
| 1.51 | 1.56 | 1.48 | 1.52 | -1.30% | |
| 1.66 | 1.66 | 1.52 | 1.54 | -7.23% | |
| 1.69 | 1.72 | 1.63 | 1.66 | -1.19% | |
| 1.71 | 1.87 | 1.68 | 1.68 | -0.59% | |
| 1.73 | 1.81 | 1.67 | 1.69 | +0.60% | |
| 1.76 | 1.78 | 1.68 | 1.68 | -5.08% | |
| 1.81 | 1.84 | 1.76 | 1.77 | -3.80% | |
| 1.81 | 1.88 | 1.73 | 1.84 | -0.54% | |
| 1.98 | 2.02 | 1.76 | 1.85 | -1.07% | |
| 2.25 | 2.33 | 1.86 | 1.87 | -16.14% | |
| 1.88 | 2.32 | 1.83 | 2.23 | +23.20% | |
| 1.93 | 2.03 | 1.79 | 1.81 | -1.09% | |
| 1.39 | 1.85 | 1.37 | 1.83 | +28.87% | |
| 1.20 | 1.56 | 1.16 | 1.42 | +14.52% | |
| 1.12 | 1.51 | 1.07 | 1.24 | -70.69% | |
| 4.38 | 4.45 | 4.07 | 4.23 | +2.55% | |
| 4.69 | 4.72 | 4.01 | 4.13 | -11.67% | |
| 4.99 | 4.99 | 4.52 | 4.67 | -5.47% | |
| 5.10 | 5.10 | 4.74 | 4.94 | -1.40% | |
| 5.35 | 5.60 | 4.98 | 5.01 | -4.75% | |
| 4.80 | 5.30 | 4.75 | 5.26 | +9.58% | |
| 4.60 | 4.88 | 4.41 | 4.80 | +3.23% | |
| 5.12 | 5.12 | 4.37 | 4.65 | -10.49% | |
| 5.18 | 5.40 | 5.15 | 5.20 | +1.66% | |
| 5.50 | 5.52 | 5.06 | 5.11 | -9.07% | |
| 5.40 | 5.74 | 5.32 | 5.62 | +2.93% | |
| 5.46 | 5.50 | 5.31 | 5.46 | -0.73% | |
| 5.47 | 5.54 | 5.35 | 5.50 | +0.18% | |
| 5.24 | 5.62 | 5.21 | 5.49 | +5.37% | |
| 4.97 | 5.34 | 4.96 | 5.21 | +4.41% | |
| 4.91 | 5.10 | 4.85 | 4.99 | +0.81% | |
| 5.02 | 5.08 | 4.91 | 4.95 | -2.56% | |
| 5.01 | 5.13 | 4.92 | 5.08 | +1.20% | |
| 5.15 | 5.19 | 4.91 | 5.02 | -2.52% | |
| 5.24 | 5.35 | 5.13 | 5.15 | -2.46% | |
| 5.29 | 5.44 | 5.15 | 5.28 | +0.57% | |
| 5.35 | 5.56 | 5.16 | 5.25 | -1.32% | |
| 5.50 | 5.52 | 5.28 | 5.32 | -2.92% | |
| 5.57 | 5.67 | 5.45 | 5.48 | -1.44% | |
| 5.53 | 5.66 | 5.41 | 5.56 | +0.54% | |
| 5.21 | 5.61 | 5.15 | 5.53 | +8.64% | |
| 5.19 | 5.44 | 5.08 | 5.09 | -2.49% | |
| 5.45 | 5.48 | 4.92 | 5.22 | -3.51% | |
| 5.45 | 5.60 | 5.31 | 5.41 | -0.37% | |
| 5.32 | 5.59 | 5.25 | 5.43 | +1.31% | |
| 5.45 | 5.93 | 5.27 | 5.36 | +0.75% | |
| 5.42 | 5.44 | 5.23 | 5.32 | -1.85% | |
| 5.55 | 5.55 | 5.37 | 5.42 | -2.17% | |
| 5.25 | 5.65 | 5.25 | 5.54 | +5.93% | |
| 5.16 | 5.31 | 5.05 | 5.23 | +0.77% | |
| 5.21 | 5.43 | 5.09 | 5.19 | -0.57% | |
| 5.01 | 5.39 | 4.97 | 5.22 | +4.61% | |
| 4.74 | 5.13 | 4.74 | 4.99 | +5.05% | |
| 4.52 | 4.83 | 4.39 | 4.75 | +2.59% | |
| 4.39 | 4.74 | 4.22 | 4.63 | +4.99% | |
| 4.28 | 4.45 | 4.20 | 4.41 | +4.01% | |
| 4.14 | 4.30 | 4.08 | 4.24 | +2.42% | |
| 4.15 | 4.16 | 3.96 | 4.14 | +0.24% | |
| 4.07 | 4.19 | 3.95 | 4.13 | +0.49% | |
| 4.24 | 4.33 | 4.01 | 4.11 | -1.67% | |
| 4.11 | 4.20 | 4.05 | 4.18 | +0.48% | |
| 4.08 | 4.27 | 4.06 | 4.16 | +2.46% | |
| 4.25 | 4.31 | 4.02 | 4.06 | -4.25% | |
| 4.70 | 4.76 | 4.14 | 4.24 | -9.21% | |
| 5.12 | 5.21 | 4.65 | 4.67 | -9.85% | |
| 5.17 | 5.26 | 5.11 | 5.18 | +0.58% | |
| 5.16 | 5.26 | 5.04 | 5.15 | -0.39% | |
| 5.26 | 5.31 | 5.13 | 5.17 | -2.64% | |
| 5.28 | 5.33 | 5.10 | 5.31 | +0.57% | |
| 5.05 | 5.35 | 4.98 | 5.28 | +4.55% | |
| 5.50 | 5.50 | 5.01 | 5.05 | -8.84% | |
| 4.94 | 5.75 | 4.90 | 5.54 | +11.69% | |
| 5.02 | 5.12 | 4.93 | 4.96 | -1.00% | |
| 5.27 | 5.68 | 5.00 | 5.01 | -4.57% | |
| 5.38 | 5.43 | 5.14 | 5.25 | -1.13% | |
| 3.95 | 5.42 | 3.94 | 5.31 | +33.08% | |
| 4.62 | 4.70 | 3.97 | 3.99 | -12.11% | |
| 4.59 | 4.91 | 4.51 | 4.54 | -1.09% | |
| 4.81 | 4.84 | 4.57 | 4.59 | -4.18% | |
| 4.77 | 4.81 | 4.68 | 4.79 | 0.00% | |
| 4.94 | 4.99 | 4.78 | 4.79 | -3.23% | |
| 4.75 | 5.04 | 4.75 | 4.95 | +5.32% | |
| 4.88 | 4.98 | 4.67 | 4.70 | -3.69% | |
| 4.89 | 5.02 | 4.81 | 4.88 | +0.21% | |
| 4.97 | 5.05 | 4.71 | 4.87 | 0.00% | |
| 5.22 | 5.25 | 4.84 | 4.87 | -7.06% | |
| 5.42 | 5.46 | 5.19 | 5.24 | -4.38% | |
| 5.60 | 5.68 | 5.45 | 5.48 | -1.97% | |
| 5.27 | 5.65 | 5.23 | 5.59 | +6.27% | |
| 5.25 | 5.35 | 5.18 | 5.26 | +0.57% | |
| 4.97 | 5.30 | 4.95 | 5.23 | +5.44% | |
| 4.71 | 5.07 | 4.70 | 4.96 | +4.86% | |
| 4.99 | 5.04 | 4.71 | 4.73 | -2.67% | |
| 4.89 | 4.93 | 4.73 | 4.86 | -1.02% | |
| 4.95 | 4.99 | 4.80 | 4.91 | -0.81% | |
| 5.05 | 5.14 | 4.85 | 4.95 | -1.98% | |
| 4.94 | 5.19 | 4.92 | 5.05 | +0.60% | |
| 5.27 | 5.27 | 4.99 | 5.02 | -5.28% | |
| 5.21 | 5.35 | 5.18 | 5.30 | +1.34% | |
| 5.13 | 5.29 | 5.00 | 5.23 | +1.95% | |
| 4.74 | 5.15 | 4.71 | 5.13 | +9.38% | |
| 4.81 | 4.84 | 4.53 | 4.69 | -2.49% | |
| 4.94 | 4.95 | 4.80 | 4.81 | -2.43% | |
| 4.92 | 5.01 | 4.84 | 4.93 | +0.20% | |
| 5.14 | 5.27 | 4.89 | 4.92 | -5.93% | |
| 5.07 | 5.24 | 5.04 | 5.23 | +3.16% | |
| 5.01 | 5.11 | 4.85 | 5.07 | +0.80% | |
| 5.01 | 5.15 | 4.90 | 5.03 | -0.49% | |
| 5.11 | 5.23 | 5.00 | 5.06 | -1.65% | |
| 5.13 | 5.35 | 4.70 | 5.14 | -1.72% | |
| 5.28 | 5.40 | 5.18 | 5.23 | -0.19% | |
| 5.25 | 5.29 | 5.18 | 5.24 | +1.16% | |
| 5.19 | 5.26 | 5.11 | 5.18 | -0.19% | |
| 5.49 | 5.52 | 5.06 | 5.19 | -5.81% | |
| 5.44 | 5.55 | 5.24 | 5.51 | +1.29% | |
| 5.34 | 5.46 | 5.26 | 5.44 | +3.42% | |
| 5.36 | 5.44 | 5.24 | 5.26 | -2.41% | |
| 5.72 | 5.79 | 5.39 | 5.39 | -4.77% | |
| 5.34 | 5.68 | 5.34 | 5.66 | +5.99% | |
| 5.18 | 5.36 | 5.12 | 5.34 | +1.71% | |
| 5.40 | 5.47 | 5.12 | 5.25 | -2.60% | |
| 5.66 | 5.71 | 5.36 | 5.39 | -4.94% | |
| 5.68 | 5.78 | 5.64 | 5.67 | — |
Prices are adjusted for stock splits. See adjusted closing price for how dividends and splits affect history, and the ALDX chart for longer ranges.