Cabaletta Bio (CABA) Options Chain

NASDAQ: CABAHealth CareBiotechnology: Biological Products (No Diagnostic Substances)USD

1.93-0.02 (-1.03%)

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

Expiration date

Expiration: Nov 20, 2026
Days to expiration: 40
Share price: $1.93
Put/call ratio (OI): 0.12
Put/call ratio (volume): 2.01
ATM implied volatility: 66.0%
Expected move: ±$0.4218
Open interest (C / P): 4.43K / 532

CABA options summary

The CABA options chain for the November 20, 2026 expiration lists 11 call and 9 put contracts, with 40 days until expiration. Open interest stands at 4,433 calls and 532 puts, a put/call ratio of 0.12, which is tilted bullish, with calls outnumbering puts. At-the-money implied volatility near the $2.00 strike is 66.0%, which implies the market expects a move of about ±$0.4218 (21.9%) in Cabaletta Bio stock by expiration.

The most open interest sits at the $2.50 call (1.34K contracts) and the $2.50 put (283 contracts).

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

CABA options chain · November 20, 2026

CABA 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
171	5	256.3%	1.40	0.95	1.95	0.50	0.00	1.00	0.25	—	1	10
40	23	134.4%	0.95	0.45	1.45	1.00	—	—	—	—	—	—
81	4	125.8%	0.60	0.05	1.05	1.50	0.00	1.00	0.05	318.8%	1	1
CABA $1.93
583	10	60.2%	0.21	0.00	0.25	2.00	0.15	0.30	0.25	71.9%	1	75
1,344	18	103.9%	0.09	0.05	0.15	2.50	0.00	0.80	0.48	157.8%	1	283
741	12	92.2%	0.02	0.00	0.05	3.00	0.70	1.70	1.11	153.1%	2	48
227	1	114.1%	0.05	0.00	0.05	3.50	1.10	2.10	1.12	118.8%	1	3
174	1	131.3%	0.05	0.00	0.05	4.00	1.55	2.55	1.58	348.4%	80	15
23	16	376.6%	0.05	0.00	1.00	4.50	2.10	3.10	2.09	153.1%	84	52
35	1	159.4%	0.05	0.00	0.05	5.00	2.60	3.60	2.42	165.6%	82	45
1,014	35	246.9%	0.06	0.00	0.25	5.50	—	—	—	—	—	—

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 CABA put/call ratio?

For the November 20, 2026 expiration, the CABA put/call ratio based on open interest is 0.12 (532 puts vs 4,433 calls), and 2.01 based on today's volume. A ratio above 1 means more puts than calls.

What is CABA's implied volatility?

At-the-money implied volatility for CABA options expiring November 20, 2026 is about 66.0%, an annualized estimate of how much the market expects Cabaletta Bio stock to move.

How many CABA option expiration dates are there?

CABA has 7 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.