BillionToOne (BLLN) Options Chain
NASDAQ: BLLNHealth CareMedical SpecialitiesUSD
At close: Oct 9, 4:00 PM ET · Delayed 15 min
Expiration date
- Expiration
- Nov 20, 2026
- Days to expiration
- 40
- Share price
- $98.09
- Put/call ratio (OI)
- 2.11
- Put/call ratio (volume)
- 0.16
- Expected move
- ±$23.46
- Open interest (C / P)
- 435 / 916
BLLN options summary
The BLLN options chain for the November 20, 2026 expiration lists 13 call and 14 put contracts, with 40 days until expiration. Open interest stands at 435 calls and 916 puts, a put/call ratio of 2.11, which is more bearish, with puts outnumbering calls. At-the-money implied volatility near the $100.00 strike is 72.3%, which implies the market expects a move of about ±$23.46 (23.9%) in BillionToOne stock by expiration.
The most open interest sits at the $145.00 call (116 contracts) and the $80.00 put (744 contracts).
Summary generated from market data by MetaCap's automated system. Methodology
BLLN options chain · November 20, 2026
| Calls | Puts | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Last | Bid | Ask | Strike | Bid | Ask | Last | |||||
| — | — | — | 65.00 | 0.00 | 1.75 | 0.55 | |||||
| — | — | — | 70.00 | 0.00 | 3.20 | 1.00 | |||||
| — | — | — | 75.00 | 0.90 | 2.10 | 1.25 | |||||
| — | — | — | 80.00 | 1.90 | 2.90 | 3.39 | |||||
| — | — | — | 85.00 | 2.90 | 5.60 | 4.65 | |||||
| — | — | — | 90.00 | 4.40 | 7.00 | 6.95 | |||||
| — | — | — | 95.00 | 5.40 | 9.30 | 7.80 | |||||
| 7.91 | 7.40 | 10.50 | 100.00 | 8.70 | 11.70 | 9.15 | |||||
| 6.86 | 5.50 | 8.80 | 105.00 | 11.30 | 15.00 | 10.00 | |||||
| 8.50 | 3.90 | 7.30 | 110.00 | 14.70 | 18.10 | 20.00 | |||||
| 3.97 | 2.70 | 5.00 | 115.00 | 18.50 | 21.90 | 8.33 | |||||
| 3.44 | 2.10 | 4.60 | 120.00 | — | — | — | |||||
| 2.25 | 1.15 | 3.90 | 125.00 | 26.70 | 30.40 | 20.90 | |||||
| 1.50 | 0.05 | 3.70 | 130.00 | — | — | — | |||||
| 2.75 | 0.05 | 3.30 | 135.00 | — | — | — | |||||
| 2.12 | 0.80 | 2.95 | 140.00 | 40.40 | 44.00 | 20.63 | |||||
| 1.15 | 0.00 | 2.75 | 145.00 | 45.30 | 48.80 | 24.09 | |||||
| 2.20 | 0.00 | 2.60 | 150.00 | — | — | — | |||||
| 1.23 | 0.00 | 2.45 | 155.00 | — | — | — | |||||
| 2.00 | 0.00 | 2.20 | 170.00 | — | — | — | |||||
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 BLLN put/call ratio?
For the November 20, 2026 expiration, the BLLN put/call ratio based on open interest is 2.11 (916 puts vs 435 calls), and 0.16 based on today's volume. A ratio above 1 means more puts than calls.
What is BLLN's implied volatility?
At-the-money implied volatility for BLLN options expiring November 20, 2026 is about 72.3%, an annualized estimate of how much the market expects BillionToOne stock to move.
How many BLLN option expiration dates are there?
BLLN has 4 listed expiration dates, from Oct 16, 2026 to Mar 19, 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.