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: Oct 16, 2026
Days to expiration: 6
Share price: $1.93
Put/call ratio (OI): 0.14
Put/call ratio (volume): 1.03
ATM implied volatility: 312.5%
Expected move: ±$0.7733
Open interest (C / P): 10.60K / 1.47K

CABA options summary

The CABA options chain for the October 16, 2026 expiration lists 8 call and 9 put contracts, with 6 days until expiration. Open interest stands at 10,598 calls and 1,469 puts, a put/call ratio of 0.14, which is tilted bullish, with calls outnumbering puts. At-the-money implied volatility near the $2.00 strike is 312.5%, which implies the market expects a move of about ±$0.7733 (40.1%) in Cabaletta Bio stock by expiration.

The most open interest sits at the $4.00 call (5.13K contracts) and the $2.50 put (1.10K contracts).

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

CABA options chain · October 16, 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
1	1	1631.3%	1.51	1.25	2.15	0.50	—	—	—	—	—	—
23	1	368.8%	0.60	0.30	0.90	1.50	0.00	0.50	0.05	465.6%	100	102
CABA $1.93
430	228	262.5%	0.15	0.00	0.50	2.00	0.00	0.85	0.10	362.5%	2	88
3,285	10	153.1%	0.10	0.00	0.05	2.50	0.20	1.15	0.43	256.3%	1	1,099
1,263	70	303.1%	0.04	0.00	0.15	3.00	0.85	1.75	1.11	475.0%	5	63
459	2	275.0%	0.02	0.00	0.05	3.50	1.10	2.10	1.45	287.5%	2	12
5,126	5	318.8%	0.04	0.00	0.05	4.00	1.80	2.50	2.05	421.9%	2	10
11	1	910.9%	0.15	0.00	1.00	4.50	0.00	0.00	1.55	—	62	0
—	—	—	—	—	—	5.00	2.60	3.60	2.25	400.0%	154	95
—	—	—	—	—	—	7.50	5.10	6.10	5.30	518.8%	1	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 CABA put/call ratio?

For the October 16, 2026 expiration, the CABA put/call ratio based on open interest is 0.14 (1,469 puts vs 10,598 calls), and 1.03 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 October 16, 2026 is about 312.5%, 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.