Aldeyra Therapeutics (ALDX) Options Chain
NASDAQ: ALDXHealth CareBiotechnology: Pharmaceutical PreparationsUSD
At close: Oct 9, 4:00 PM ET · Delayed 15 min
Expiration date
- Expiration
- Oct 16, 2026
- Days to expiration
- 5
- Share price
- $0.9163
- Put/call ratio (OI)
- 0.20
- Put/call ratio (volume)
- 0.33
- ATM implied volatility
- 493.8%
- Expected move
- ±$0.5295
- Open interest (C / P)
- 928 / 190
ALDX options summary
The ALDX options chain for the October 16, 2026 expiration lists 4 call and 7 put contracts, with 5 days until expiration. Open interest stands at 928 calls and 190 puts, a put/call ratio of 0.20, which is tilted bullish, with calls outnumbering puts. At-the-money implied volatility near the $1.00 strike is 493.8%, which implies the market expects a move of about ±$0.5295 (57.8%) in Aldeyra Therapeutics stock by expiration.
The most open interest sits at the $1.50 call (767 contracts) and the $1.00 put (178 contracts).
Summary generated from market data by MetaCap's automated system. Methodology
ALDX options chain · October 16, 2026
| Calls | Puts | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Last | Bid | Ask | Strike | Bid | Ask | Last | |||||
| 0.48 | 0.00 | 0.95 | 0.50 | — | — | — | |||||
| 0.05 | 0.00 | 0.75 | 1.00 | 0.00 | 0.20 | 0.10 | |||||
| 0.09 | 0.00 | 0.05 | 1.50 | 0.20 | 0.90 | 0.55 | |||||
| 0.05 | 0.00 | 0.30 | 2.00 | 0.95 | 1.35 | 1.12 | |||||
| — | — | — | 2.50 | 1.40 | 1.75 | 1.62 | |||||
| — | — | — | 3.00 | 1.65 | 2.60 | 1.91 | |||||
| — | — | — | 4.00 | 2.65 | 3.60 | 3.12 | |||||
| — | — | — | 5.00 | 3.60 | 4.60 | 4.00 | |||||
In-the-money callsIn-the-money puts. IV = implied volatility, OI = open interest (contracts). Each contract covers 100 shares. Quotes delayed at least 15 minutes.
Frequently asked questions
What is the ALDX put/call ratio?
For the October 16, 2026 expiration, the ALDX put/call ratio based on open interest is 0.20 (190 puts vs 928 calls), and 0.33 based on today's volume. A ratio above 1 means more puts than calls.
What is ALDX's implied volatility?
At-the-money implied volatility for ALDX options expiring October 16, 2026 is about 493.8%, an annualized estimate of how much the market expects Aldeyra Therapeutics stock to move.
How many ALDX option expiration dates are there?
ALDX has 6 listed expiration dates, from Oct 16, 2026 to Mar 19, 2027.
What does "in the money" mean?
A call is in the money when the strike price is below the current share price; a put is in the money when the strike is above it. In-the-money contracts have intrinsic value and are shaded in the table.