Aldeyra Therapeutics (ALDX) Options Chain

NASDAQ: ALDXHealth CareBiotechnology: Pharmaceutical PreparationsUSD

0.9163-0.0314 (-3.31%)

At close: Oct 9, 4:00 PM ET · Delayed 15 min

Expiration date

Expiration: Dec 18, 2026
Days to expiration: 68
Share price: $0.9163
Put/call ratio (OI): 0.31
Put/call ratio (volume): 2.70
ATM implied volatility: 210.5%
Expected move: ±$0.8327
Open interest (C / P): 1.04K / 321

ALDX options summary

The ALDX options chain for the December 18, 2026 expiration lists 7 call and 6 put contracts, with 68 days until expiration. Open interest stands at 1,042 calls and 321 puts, a put/call ratio of 0.31, which is tilted bullish, with calls outnumbering puts. At-the-money implied volatility near the $1.00 strike is 210.5%, which implies the market expects a move of about ±$0.8327 (90.9%) in Aldeyra Therapeutics stock by expiration.

The most open interest sits at the $2.00 call (512 contracts) and the $1.00 put (123 contracts).

Summary generated from market data by MetaCap's automated system. Methodology

ALDX options chain · December 18, 2026

ALDX calls and puts by strike price. Shaded cells are in the money.
Calls							Puts
OI	Vol	IV	Last	Bid	Ask	Strike	Bid	Ask	Last	IV	Vol	OI
1	1	93.8%	0.77	0.00	0.85	0.50	—	—	—	—	—	—
ALDX $0.9163
76	2	264.1%	0.55	0.00	0.75	1.00	0.05	0.55	0.22	157.0%	102	123
96	20	185.9%	0.25	0.05	0.25	1.50	0.25	1.00	0.23	107.8%	—	100
512	10	191.4%	0.05	0.05	0.15	2.00	0.70	1.45	0.81	364.1%	10	86
343	4	196.9%	0.07	0.00	0.10	3.00	1.60	2.60	1.58	153.1%	3	4
0	5	50.0%	0.14	0.00	0.00	4.00	2.60	3.60	3.07	181.3%	1	7
14	1	215.6%	0.15	0.00	0.05	5.00	3.60	4.60	3.83	198.4%	—	1

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 December 18, 2026 expiration, the ALDX put/call ratio based on open interest is 0.31 (321 puts vs 1,042 calls), and 2.70 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 December 18, 2026 is about 210.5%, 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.