Ardelyx (ARDX) Options Chain

NASDAQ: ARDXHealth CareBiotechnology: Pharmaceutical PreparationsUSD

3.28+0.01 (+0.31%)

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

Expiration date

Expiration: Jan 21, 2028
Days to expiration: 468
Share price: $3.28
Put/call ratio (OI): 0.13
Put/call ratio (volume): 0.35
ATM implied volatility: 106.1%
Expected move: ±$3.94
Open interest (C / P): 8.90K / 1.13K

ARDX options summary

The ARDX options chain for the January 21, 2028 expiration lists 9 call and 8 put contracts, with 468 days until expiration. Open interest stands at 8,898 calls and 1,131 puts, a put/call ratio of 0.13, which is tilted bullish, with calls outnumbering puts. At-the-money implied volatility near the $3.00 strike is 106.1%, which implies the market expects a move of about ±$3.94 (120.1%) in Ardelyx stock by expiration.

The most open interest sits at the $2.00 call (3.06K contracts) and the $7.00 put (509 contracts).

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

ARDX options chain · January 21, 2028

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
71	1	163.7%	2.45	0.40	5.00	1.00	—	—	—	—	—	—
3,056	30	98.2%	1.70	1.60	2.10	2.00	0.15	1.40	0.25	121.7%	1	11
518	7	161.5%	1.25	0.90	3.40	3.00	0.00	1.15	0.80	50.6%	6	97
ARDX $3.28
596	5	65.2%	0.95	0.20	1.25	4.00	0.85	5.00	1.60	184.0%	1	213
1,970	13	91.6%	0.75	0.75	1.05	5.00	0.55	2.60	1.97	90.3%	5	264
639	54	88.2%	0.46	0.45	0.70	7.00	3.50	4.20	4.00	52.3%	1	509
798	8	90.2%	0.30	0.05	0.70	10.00	4.30	7.80	6.38	139.8%	48	35
652	100	95.9%	0.20	0.00	0.70	12.00	6.30	11.00	8.73	242.0%	12	1
598	1	179.2%	0.20	0.05	2.75	15.00	7.20	12.00	9.02	98.8%	2	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 ARDX put/call ratio?

For the January 21, 2028 expiration, the ARDX put/call ratio based on open interest is 0.13 (1,131 puts vs 8,898 calls), and 0.35 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 January 21, 2028 is about 106.1%, 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.