Janux Therapeutics (JANX) Options Chain

NASDAQ: JANXHealth CareBiotechnology: Pharmaceutical PreparationsUSD

18.39-0.11 (-0.59%)

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

Expiration date

Expiration: Dec 18, 2026
Days to expiration: 68
Share price: $18.39
Put/call ratio (OI): 0.85
Put/call ratio (volume): 0.74
ATM implied volatility: 77.4%
Expected move: ±$6.15
Open interest (C / P): 1.23K / 1.04K

JANX options summary

The JANX options chain for the December 18, 2026 expiration lists 14 call and 10 put contracts, with 68 days until expiration. Open interest stands at 1,230 calls and 1,043 puts, a put/call ratio of 0.85, which is fairly balanced between calls and puts. At-the-money implied volatility near the $17.50 strike is 77.4%, which implies the market expects a move of about ±$6.15 (33.4%) in Janux Therapeutics stock by expiration.

The most open interest sits at the $15.00 call (418 contracts) and the $20.00 put (273 contracts).

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

JANX options chain · December 18, 2026

JANX 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
5	5	—	8.40	6.50	10.70	5.00	—	—	—	—	—	—
1	5	108.6%	9.40	8.90	13.00	7.50	0.00	3.70	1.20	289.4%	1	0
91	1	99.8%	8.03	6.60	10.60	10.00	0.00	0.00	0.85	25.0%	1	0
41	96	90.5%	4.95	4.40	8.40	12.50	0.00	2.45	0.80	129.7%	22	236
418	419	80.9%	4.76	3.80	5.00	15.00	0.00	3.20	2.85	104.7%	4	186
290	4	80.1%	2.90	1.00	4.90	17.50	0.00	3.80	2.72	74.8%	246	250
JANX $18.39
289	27	78.5%	2.10	1.25	2.50	20.00	1.20	5.20	3.50	69.6%	59	273
34	24	92.6%	2.15	0.00	3.20	22.50	2.90	6.90	6.40	64.8%	50	45
19	1	101.8%	0.05	0.00	2.70	25.00	5.00	8.90	8.50	60.7%	50	53
0	2	25.0%	0.25	0.00	0.00	30.00	0.00	0.00	17.16	—	1	0
0	1	25.0%	0.05	0.00	0.00	35.00	19.40	23.70	20.42	268.3%	—	0
0	1	50.0%	0.45	0.00	0.00	40.00	—	—	—	—	—	—
0	1	50.0%	0.95	0.00	0.00	45.00	—	—	—	—	—	—
42	1	140.0%	0.14	0.00	0.75	50.00	—	—	—	—	—	—

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 JANX put/call ratio?

For the December 18, 2026 expiration, the JANX put/call ratio based on open interest is 0.85 (1,043 puts vs 1,230 calls), and 0.74 based on today's volume. A ratio above 1 means more puts than calls.

What is JANX's implied volatility?

At-the-money implied volatility for JANX options expiring December 18, 2026 is about 77.4%, an annualized estimate of how much the market expects Janux Therapeutics stock to move.

How many JANX option expiration dates are there?

JANX has 7 listed expiration dates, from Oct 16, 2026 to Jan 21, 2028.

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.