MBX Biosciences (MBX) Options Chain

NASDAQ: MBXHealth CareBiotechnology: Pharmaceutical PreparationsUSD

53.24-0.01 (-0.02%)

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

Expiration date

Expiration: Nov 20, 2026
Days to expiration: 40
Share price: $53.24
Put/call ratio (OI): 1.16
Put/call ratio (volume): 4.75
ATM implied volatility: 89.6%
Expected move: ±$15.80
Open interest (C / P): 25 / 29

MBX options summary

The MBX options chain for the November 20, 2026 expiration lists 8 call and 6 put contracts, with 40 days until expiration. Open interest stands at 25 calls and 29 puts, a put/call ratio of 1.16, which is fairly balanced between calls and puts. At-the-money implied volatility near the $55.00 strike is 89.6%, which implies the market expects a move of about ±$15.80 (29.7%) in MBX Biosciences stock by expiration.

The most open interest sits at the $40.00 call (10 contracts) and the $55.00 put (14 contracts).

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

MBX options chain · November 20, 2026

MBX 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
10	—	89.8%	21.00	12.30	16.70	40.00	0.00	4.90	1.10	117.4%	1	1
—	—	—	—	—	—	45.00	0.10	4.90	2.60	87.3%	1	2
1	1	93.1%	7.89	6.40	9.90	50.00	2.50	7.00	4.50	90.8%	2	2
MBX $53.24
1	1	91.5%	8.20	3.50	8.00	55.00	5.00	9.50	5.10	87.8%	10	14
9	1	88.1%	6.20	1.90	5.70	60.00	8.50	12.50	11.37	87.3%	1	5
1	1	90.2%	5.00	0.50	4.90	65.00	12.50	16.50	13.95	90.9%	4	5
1	—	102.3%	6.40	0.10	4.90	70.00	—	—	—	—	—	—
1	—	114.7%	4.40	0.00	4.90	75.00	—	—	—	—	—	—
1	—	130.2%	3.60	0.40	4.90	80.00	—	—	—	—	—	—

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 MBX put/call ratio?

For the November 20, 2026 expiration, the MBX put/call ratio based on open interest is 1.16 (29 puts vs 25 calls), and 4.75 based on today's volume. A ratio above 1 means more puts than calls.

What is MBX's implied volatility?

At-the-money implied volatility for MBX options expiring November 20, 2026 is about 89.6%, an annualized estimate of how much the market expects MBX Biosciences stock to move.

How many MBX option expiration dates are there?

MBX has 6 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.