Biogen (BIIB) Options Chain

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

225.71+7.28 (+3.33%)

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

Expiration date

Expiration: Oct 16, 2026
Days to expiration: 5
Share price: $225.71
Put/call ratio (OI): 0.66
Put/call ratio (volume): 0.08
ATM implied volatility: 50.3%
Expected move: ±$13.29
Open interest (C / P): 2.77K / 1.84K

BIIB options summary

The BIIB options chain for the October 16, 2026 expiration lists 33 call and 30 put contracts, with 5 days until expiration. Open interest stands at 2,766 calls and 1,839 puts, a put/call ratio of 0.66, which is tilted bullish, with calls outnumbering puts. At-the-money implied volatility near the $225.00 strike is 50.3%, which implies the market expects a move of about ±$13.29 (5.9%) in Biogen stock by expiration.

The most open interest sits at the $190.00 call (494 contracts) and the $190.00 put (493 contracts).

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

BIIB options chain · October 16, 2026

BIIB 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
0	2	—	119.00	0.00	0.00	100.00	—	—	—	—	—	—
1	—	—	96.70	111.70	115.90	105.00	0.00	2.35	0.85	380.5%	—	1
—	—	—	—	—	—	110.00	0.00	2.45	1.10	362.8%	1	4
—	—	—	—	—	—	115.00	0.00	2.85	1.20	353.7%	—	1
—	—	—	—	—	—	120.00	0.00	2.90	1.50	335.4%	1	8
—	—	—	—	—	—	125.00	0.00	2.95	3.00	318.0%	3	6
1	—	—	65.18	50.00	54.10	130.00	0.00	2.15	1.25	280.9%	2	10
—	—	—	—	—	—	135.00	0.00	0.00	1.20	50.0%	1	0
—	—	—	—	—	—	140.00	0.00	2.00	0.83	244.7%	1	11
—	—	—	—	—	—	145.00	0.00	1.55	0.51	218.2%	2	14
—	—	—	—	—	—	150.00	0.00	0.00	0.61	50.0%	1	0
0	1	—	44.20	0.00	0.00	155.00	0.00	1.35	1.60	185.0%	1	9
8	1	—	55.90	59.90	63.80	160.00	0.00	2.15	1.15	188.8%	6	31
0	2	—	52.35	0.00	0.00	165.00	0.00	2.15	0.95	174.9%	1	39
0	—	—	41.90	0.00	0.00	170.00	0.00	2.15	0.20	161.2%	1	52
5	6	165.3%	54.00	48.80	52.40	175.00	0.00	2.15	0.16	147.8%	1	186
14	11	—	29.20	40.40	44.40	180.00	0.00	2.15	0.12	134.7%	3	165
3	1	139.3%	43.75	38.80	42.50	185.00	0.00	2.15	1.05	121.7%	1	10
494	6	118.8%	35.30	33.80	37.20	190.00	0.00	0.70	0.20	85.1%	3	493
6	1	59.0%	30.30	28.90	32.70	195.00	0.00	1.55	0.43	88.5%	1	7
1	—	104.3%	26.81	26.40	30.00	197.50	—	—	—	—	—	—
309	3	61.3%	25.82	24.60	27.40	200.00	0.00	0.85	0.23	66.4%	2	366
110	3	53.4%	12.15	15.10	18.00	210.00	0.10	2.35	1.15	60.3%	3	225
7	4	64.9%	9.89	7.90	11.60	217.50	0.25	3.50	1.40	66.1%	7	3
315	40	60.9%	7.80	5.60	9.60	220.00	0.75	3.30	1.75	54.9%	24	145
6	1	55.0%	3.49	4.60	7.50	222.50	1.20	4.90	5.49	61.0%	1	5
122	65	52.6%	4.95	3.40	5.90	225.00	1.80	4.70	4.25	48.0%	3	28
BIIB $225.71
40	22	49.6%	3.40	1.25	4.40	227.50	3.40	6.40	6.53	51.6%	1	10
311	235	48.5%	2.50	1.50	3.30	230.00	5.20	8.80	10.00	60.4%	3	8
28	70	59.1%	1.85	0.35	3.50	232.50	—	—	—	—	—	—
51	3	57.3%	1.21	0.05	2.60	235.00	—	—	—	—	—	—
7	4	51.2%	0.42	0.05	3.00	237.50	—	—	—	—	—	—
367	58	46.1%	0.74	0.20	0.80	240.00	13.60	16.30	18.80	63.8%	2	2
5	11	56.5%	0.25	0.10	0.80	245.00	—	—	—	—	—	—
333	386	57.5%	0.20	0.10	0.80	250.00	22.70	26.40	33.66	51.4%	1	0
5	1	81.3%	1.18	0.00	2.15	255.00	—	—	—	—	—	—
166	1	67.3%	0.10	0.00	0.55	260.00	—	—	—	—	—	—
21	1	90.9%	0.20	0.00	1.00	270.00	—	—	—	—	—	—
22	12	127.0%	0.40	0.00	2.45	280.00	59.90	64.00	84.50	225.0%	—	0
0	2	50.0%	0.95	0.00	0.00	290.00	—	—	—	—	—	—
8	1	123.6%	0.20	0.00	0.70	300.00	—	—	—	—	—	—

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 BIIB put/call ratio?

For the October 16, 2026 expiration, the BIIB put/call ratio based on open interest is 0.66 (1,839 puts vs 2,766 calls), and 0.08 based on today's volume. A ratio above 1 means more puts than calls.

What is BIIB's implied volatility?

At-the-money implied volatility for BIIB options expiring October 16, 2026 is about 50.3%, an annualized estimate of how much the market expects Biogen stock to move.

How many BIIB option expiration dates are there?

BIIB has 14 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.