NASDAQ · ALDXHealthcarePharmaceuticals

Aldeyra Therapeutics, Inc. (ALDX)

$0.6474+4.32%
Close Nov 4, 2026 · split-adjusted
Nov 4, 2026$0.65▼ 87.57% in range
Nov 3, 2025Low $0.56 · High $5.62Nov 4, 2026
What changed · written from our data
As of Nov 4, 2026

Aldeyra Therapeutics closed at $0.65 on Nov 4, up 4.32%, 88.5% below its 52-week closing high. Volume of 1.0M shares was 1.01× its 20-day average (close to normal).

Split-adjusted performance: -29.3% over one month, -62.8% over six months, -87.6% over one year.

Short interest was 3.2M shares at the Oct 15 settlement, down 8.2% from the prior report (6.0% of float, 1.3 days to cover).

Market cap$39.1M60.3M shares
Revenue · quarter$0.00—
Diluted EPS$-0.09—
P/E · TTM—
Net margin—
Dividend yieldNone
52-week range0.56 – 5.62−88.5% from high
Volume1.0M1.01× 20-day avg
Volatility · 60d95.6%Annualised
Short % of float6.0%1.3 days to cover
Net cash$45.1MCash $45.1M
Next earnings—Not scheduled
Split-adjusted performance
1W −5.3%1M −29.3%3M −59.3%6M −62.8%YTD −87.5%1Y −87.6%3Y −58.0%5Y −92.1%

Earnings reactions

History →

No reported quarters with price history yet.

Rank within Pharmaceuticals

Percentile among 420 companies (100 = best)

6-month momentum17
Revenue growth—
Net margin—
Value (low P/E)—
Size28

Industry medians: 6-month return −25.5%, revenue growth +6.2%, net margin −33.8%, P/E 16.1×.

Short interest

Details →
Shares short3.2M−8.2% vs prior
Days to cover1.3Settled Oct 15
% of float6.0%
Short vol. 10d35.7%of daily volume

Closest peers by size in Pharmaceuticals

CompanyPriceToday6MRev. growthNet marginP/EMkt cap
ALDXAldeyra Therapeutics$0.6474+4.32%−62.8%———$39.1M
DWTXDogwood Therapeutics$1.03−0.96%−37.6%———$39.4MCompare
SCYXSCYNEXIS$3.84−2.54%−51.1%−82.8%3147.7%—$38.2MCompare
GRCEGrace Therapeutics$1.81−1.63%−23.6%———$38.1MCompare
VERUVeru$2.20+1.85%−0.9%———$37.5MCompare
ELTXElicio Therapeutics$1.56+2.63%−85.1%———$42.3MCompare
SERSerina Therapeutics$1.69−7.65%−7.7%−100.0%——$42.9MCompare
BTMDBiote$1.23+9.82%−44.1%−9.5%−14.8%6.0$35.3MCompare
NNVCNanoViricides$1.38−3.50%−5.5%———$35.2MCompare

Quick answers

What does Aldeyra Therapeutics do?
Aldeyra Therapeutics Inc is a biotechnology company engaged in developing and commercializing next-generation medicines to improve the lives of patients with immune-mediated and metabolic diseases. The company's product candidate, Reproxalap, is a treatment in late-stage development for dry eye disease and allergic conjunctivitis.
What is ALDX's market cap?
$39.06M, based on the Nov 4 close of $0.65.
Does Aldeyra Therapeutics pay a dividend?
No regular cash dividend has been paid in the last year.
How much of ALDX is sold short?
3.2M shares, 6.0% of float, as of Oct 15, 2026.
What sector is ALDX in?
Healthcare, in the Pharmaceuticals industry.

About Aldeyra Therapeutics

Aldeyra Therapeutics Inc is a biotechnology company engaged in developing and commercializing next-generation medicines to improve the lives of patients with immune-mediated and metabolic diseases. The company's product candidate, Reproxalap, is a treatment in late-stage development for dry eye disease and allergic conjunctivitis. In addition, it also has additional product candidates in development for proliferative vitreoretinopathy, primary vitreoretinal lymphoma, and other retinal diseases, autoimmune disease, and cancer. Company products includes ADX248, ADX743, ADX631, ADX246, ADX629, ADX2191.

HQ: Lexington, MA6 employeesListed May 2, 2014aldeyra.com

Sources: Massive / Polygon daily aggregates (split-adjusted) · SEC filings via Massive · FINRA settlements via Massive · Financial Modeling Prep. Figures are dated where shown; research is informational, not investment advice. Methodology