Ardelyx (ARDX) Options Chain

NASDAQ: ARDXHealthcareBiotechnologyUSD

3.27+0.01 (+0.31%)

At close: Oct 8, 4:00 PM ET · Delayed 15 min

Expiration date

Expiration: Oct 16, 2026
Days to expiration: 8
Share price: $3.27
Put/call ratio (OI): 2.54
Put/call ratio (volume): 0.45
ATM implied volatility: 88.3%
Expected move: ±$0.4274
Open interest (C / P): 8.23K / 20.90K

ARDX options summary

The ARDX options chain for the October 16, 2026 expiration lists 13 call and 15 put contracts, with 8 days until expiration. Open interest stands at 8,231 calls and 20,903 puts, a put/call ratio of 2.54, which is more bearish, with puts outnumbering calls. At-the-money implied volatility near the $3.00 strike is 88.3%, which implies the market expects a move of about ±$0.4274 (13.1%) in Ardelyx stock by expiration.

The most open interest sits at the $6.00 call (5.28K contracts) and the $4.00 put (20.39K contracts).

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

ARDX options chain · October 16, 2026

ARDX 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
18	1	1453.1%	3.20	1.70	2.80	1.00	0.00	0.60	0.15	1043.8%	1	2
41	7	162.5%	1.26	0.70	1.85	2.00	0.00	0.75	0.38	585.9%	1	21
53	43	115.6%	0.50	0.00	0.75	3.00	0.00	0.05	0.05	60.9%	1	3
ARDX $3.27
499	10	103.1%	0.05	0.00	0.05	4.00	0.70	0.95	0.80	160.9%	10	20,391
1,090	2	178.1%	0.05	0.00	0.05	5.00	1.40	2.35	1.59	289.1%	2	113
5,283	100	234.4%	0.01	0.00	0.05	6.00	2.60	3.40	2.60	443.8%	83	148
892	2	278.1%	0.06	0.00	0.05	7.00	3.20	4.40	3.62	343.8%	1	92
93	1	359.4%	0.05	0.00	0.10	8.00	4.20	6.90	4.70	856.3%	2	127
0	2	50.0%	0.04	0.00	0.00	9.00	4.50	5.90	3.00	515.6%	5	5
226	50	375.0%	0.01	0.00	0.05	10.00	6.00	7.50	6.58	362.5%	1	0
25	20	481.3%	0.26	0.00	0.15	11.00	7.00	8.50	7.55	387.5%	—	1
10	—	1014.1%	0.24	0.00	1.70	12.00	8.00	9.50	8.55	406.3%	—	0
—	—	—	—	—	—	13.00	9.00	10.50	9.56	425.0%	—	0
—	—	—	—	—	—	14.00	8.10	12.20	7.90	1390.6%	—	0
1	—	751.6%	0.60	0.00	0.55	15.00	10.60	13.00	11.55	559.4%	—	0

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 October 16, 2026 expiration, the ARDX put/call ratio based on open interest is 2.54 (20,903 puts vs 8,231 calls), and 0.45 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 October 16, 2026 is about 88.3%, 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.