Ardelyx (ARDX) Options Chain
NASDAQ: ARDXHealth CareBiotechnology: Pharmaceutical PreparationsUSD
At close: Oct 9, 4:00 PM ET · Delayed 15 min
Expiration date
- Expiration
- Nov 20, 2026
- Days to expiration
- 40
- Share price
- $3.28
- Put/call ratio (OI)
- 0.34
- Put/call ratio (volume)
- 0.67
- Expected move
- ±$0.6489
- Open interest (C / P)
- 264 / 89
ARDX options summary
The ARDX options chain for the November 20, 2026 expiration lists 4 call and 1 put contracts, with 40 days until expiration. Open interest stands at 264 calls and 89 puts, a put/call ratio of 0.34, which is tilted bullish, with calls outnumbering puts. At-the-money implied volatility near the $3.00 strike is 59.8%, which implies the market expects a move of about ±$0.6489 (19.8%) in Ardelyx stock by expiration.
The most open interest sits at the $4.00 call (162 contracts) and the $3.00 put (89 contracts).
Summary generated from market data by MetaCap's automated system. Methodology
ARDX options chain · November 20, 2026
| Calls | Puts | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Last | Bid | Ask | Strike | Bid | Ask | Last | |||||
| 1.20 | 0.75 | 1.90 | 2.00 | — | — | — | |||||
| 0.45 | 0.15 | 0.65 | 3.00 | 0.05 | 0.25 | 0.15 | |||||
| 0.10 | 0.05 | 0.60 | 4.00 | — | — | — | |||||
| 0.01 | 0.00 | 0.15 | 5.00 | — | — | — | |||||
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 ARDX put/call ratio?
For the November 20, 2026 expiration, the ARDX put/call ratio based on open interest is 0.34 (89 puts vs 264 calls), and 0.67 based on today's volume. A ratio above 1 means more puts than calls.
What is ARDX's implied volatility?
At-the-money implied volatility for ARDX options expiring November 20, 2026 is about 59.8%, an annualized estimate of how much the market expects Ardelyx stock to move.
How many ARDX option expiration dates are there?
ARDX has 6 listed expiration dates, from Oct 16, 2026 to Jan 19, 2029.
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.