Seres Therapeutics (MCRB) Options Chain
NASDAQ: MCRBHealthcareBiotechnologyUSD
At close: Oct 8, 4:00 PM ET · Delayed 15 min
Expiration date
- Expiration
- Oct 16, 2026
- Days to expiration
- 7
- Share price
- $2.63
- Put/call ratio (OI)
- 1.48
- Put/call ratio (volume)
- 0.06
- Expected move
- ±$0.1821
- Open interest (C / P)
- 54 / 80
MCRB options summary
The MCRB options chain for the October 16, 2026 expiration lists 6 call and 6 put contracts, with 7 days until expiration. Open interest stands at 54 calls and 80 puts, a put/call ratio of 1.48, which is more bearish, with puts outnumbering calls. At-the-money implied volatility near the $5.00 strike is 50.0%, which implies the market expects a move of about ±$0.1821 (6.9%) in Seres Therapeutics stock by expiration.
The most open interest sits at the $17.50 call (50 contracts) and the $12.50 put (29 contracts).
Summary generated from market data by MetaCap's automated system. Methodology
MCRB options chain · October 16, 2026
| Calls | Puts | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Last | Bid | Ask | Strike | Bid | Ask | Last | |||||
| 0.05 | 0.00 | 0.00 | 5.00 | 0.00 | 0.00 | 2.33 | |||||
| 0.05 | 0.00 | 0.00 | 7.50 | 2.35 | 3.70 | 1.90 | |||||
| 0.05 | 0.00 | 0.00 | 10.00 | 4.90 | 6.10 | 3.40 | |||||
| 0.89 | 0.00 | 1.75 | 12.50 | 7.20 | 8.70 | 7.40 | |||||
| 0.05 | 0.00 | 0.00 | 15.00 | 9.70 | 11.20 | 8.30 | |||||
| 0.22 | 0.00 | 0.75 | 17.50 | 0.00 | 0.00 | 10.50 | |||||
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 MCRB put/call ratio?
For the October 16, 2026 expiration, the MCRB put/call ratio based on open interest is 1.48 (80 puts vs 54 calls), and 0.06 based on today's volume. A ratio above 1 means more puts than calls.
What is MCRB's implied volatility?
At-the-money implied volatility for MCRB options expiring October 16, 2026 is about 50.0%, an annualized estimate of how much the market expects Seres Therapeutics stock to move.
How many MCRB option expiration dates are there?
MCRB has 4 listed expiration dates, from Oct 16, 2026 to Apr 16, 2027.
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.