BillionToOne (BLLN) Options Chain

NASDAQ: BLLNHealth CareMedical SpecialitiesUSD

98.09+2.68 (+2.81%)

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

Expiration date

Expiration: Dec 18, 2026
Days to expiration: 68
Share price: $98.09
Put/call ratio (OI): 0.69
Put/call ratio (volume): 0.45
ATM implied volatility: 68.5%
Expected move: ±$29.00
Open interest (C / P): 2.02K / 1.40K

BLLN options summary

The BLLN options chain for the December 18, 2026 expiration lists 33 call and 25 put contracts, with 68 days until expiration. Open interest stands at 2,016 calls and 1,396 puts, a put/call ratio of 0.69, which is tilted bullish, with calls outnumbering puts. At-the-money implied volatility near the $100.00 strike is 68.5%, which implies the market expects a move of about ±$29.00 (29.6%) in BillionToOne stock by expiration.

The most open interest sits at the $170.00 call (843 contracts) and the $135.00 put (369 contracts).

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

BLLN options chain · December 18, 2026

BLLN 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
29	2	113.4%	86.00	56.50	60.50	40.00	0.00	2.15	0.26	137.9%	10	8
9	11	102.0%	56.00	51.50	55.60	45.00	0.05	4.40	2.50	147.2%	2	0
12	1	137.0%	100.00	49.30	52.10	50.00	0.00	1.60	0.90	100.5%	4	8
0	6	—	37.53	0.00	0.00	55.00	0.00	0.00	1.48	25.0%	8	0
12	1	85.3%	41.65	37.60	41.00	60.00	0.00	2.55	1.10	86.4%	10	94
2	12	79.4%	50.98	32.80	36.50	65.00	0.00	2.90	1.80	77.8%	3	14
9	2	76.4%	55.60	28.50	32.10	70.00	0.05	3.50	2.00	71.1%	1	52
5	1	74.6%	45.00	24.50	28.00	75.00	0.95	4.30	2.05	69.3%	33	78
22	1	72.3%	49.34	20.70	24.10	80.00	1.95	5.50	1.65	67.5%	5	43
30	1	71.3%	28.53	17.30	20.70	85.00	3.40	6.90	6.00	65.9%	1	94
41	10	72.5%	14.20	14.90	17.60	90.00	5.30	8.80	6.50	65.3%	25	109
78	1	70.7%	21.00	11.60	15.20	95.00	7.50	11.20	10.44	64.9%	7	73
BLLN $98.09
54	21	72.4%	9.25	10.00	12.90	100.00	10.10	14.00	12.10	64.7%	1	34
91	2	72.2%	7.50	8.00	11.00	105.00	13.10	17.10	12.32	64.5%	—	13
53	1	72.1%	6.10	6.40	9.30	110.00	16.50	20.30	9.33	63.9%	1	320
32	12	70.7%	8.00	4.60	7.90	115.00	20.00	23.80	10.90	62.7%	1	11
49	10	70.4%	3.90	3.60	6.50	120.00	25.80	29.50	12.00	74.9%	7	25
74	20	71.3%	3.25	2.95	5.50	125.00	0.00	0.00	38.00	—	3	0
68	66	66.8%	5.50	1.05	4.70	130.00	32.10	35.50	18.00	58.1%	14	8
421	122	65.4%	7.10	0.35	3.90	135.00	36.50	39.80	28.70	56.1%	12	369
15	1	66.5%	2.50	0.05	3.50	140.00	0.00	0.00	52.00	—	4	0
14	35	68.6%	3.10	0.05	3.10	145.00	48.80	52.90	38.30	90.8%	6	19
27	1	71.2%	2.30	0.05	2.85	150.00	50.20	53.80	31.00	76.3%	3	23
0	1	88.8%	18.80	1.25	4.20	155.00	—	—	—	—	—	—
7	1	75.9%	3.15	0.00	2.50	160.00	—	—	—	—	—	—
1	1	78.3%	0.85	0.00	2.35	165.00	—	—	—	—	—	—
843	2	78.3%	1.00	0.00	1.95	170.00	69.10	72.90	49.60	78.6%	—	1
0	5	25.0%	1.38	0.00	0.00	175.00	—	—	—	—	—	—
7	1	85.9%	1.00	0.00	2.15	180.00	—	—	—	—	—	—
11	5	88.8%	1.70	0.00	2.15	185.00	—	—	—	—	—	—
0	1	25.0%	1.40	0.00	0.00	190.00	88.70	92.30	65.30	76.5%	—	0
0	—	25.0%	1.00	0.00	0.00	195.00	—	—	—	—	—	—
0	—	25.0%	1.60	0.00	0.00	200.00	—	—	—	—	—	—

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 December 18, 2026 expiration, the BLLN put/call ratio based on open interest is 0.69 (1,396 puts vs 2,016 calls), and 0.45 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 December 18, 2026 is about 68.5%, 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.