Biogen

BIIB · NASDAQ

$243.10+$9.62 (+4.12%)TodayMarket closed · Oct 20, 7:52 PM ET

Prev close $233.48

BIIB options chain

Calls and puts around the current price

By Fri, Oct 30 options price a move of ±$16.20 (6.7%), between $226.79 and $259.19.

At-the-money implied volatility: 50.8%
Put/call open interest: 0.90
Total open interest: 1.00K
Underlying price: $242.99

BIIB options expiring Oct 30, 2026: calls on the left, puts on the right. Calls below $242.99 and puts above it are in the money.
Calls		Calls					Puts
Open int.	IV	Ask	Bid	Strike	Bid	Ask	IV	Open int.
21	52.7%	$18.50	$14.50	230	$1.90	$4.80	53.3%	12
10	51.6%	$16.50	$12.70	232.5	$2.90	$4.70	51.0%	2
23	51.9%	$15.00	$10.80	235	$3.30	$6.80	54.6%	1
1	50.4%	$13.20	$9.20	237.5	$4.50	$6.90	51.8%	4
318	47.2%	$11.10	$7.50	240	$5.10	$8.40	51.5%	4
4	51.6%	$10.40	$6.80	242.5	$6.20	$9.00	49.9%	0
BIIB $242.99
15	48.6%	$9.10	$4.90	245	$6.70	$10.80	48.4%	0
0	49.8%	$7.90	$4.40	247.5	$8.10	$11.90	47.1%	0
8	48.5%	$6.80	$3.00	250	$10.30	$12.90	48.0%	0
0	48.2%	$6.00	$2.25	252.5	$11.90	$15.10	48.9%	0
17	44.7%	$4.20	$1.65	255	$13.00	$16.80	46.1%	1
0	49.7%	$4.70	$1.15	257.5	$15.00	$18.70	46.8%	0

Volatility smile

Implied volatility by strike for Fri, Oct 30, calls and puts averaged.

Unusual options activity

The latest large trades, newest first

Unusual BIIB options trades
Contract	Trade	Contracts	Premium	Sentiment	Time
BIIB 235P Dec 18	Block	49	$58.80K	bullish	Oct 20, 1:54 PM ET
BIIB 235P Dec 18	Block	123	$147.60K	bullish	Oct 20, 1:04 PM ET
BIIB 250C Jan 15	Large	100	$160.00K	neutral	Oct 20, 11:07 AM ET
BIIB 220P Mar 19	Large	200	$270.00K	bearish	Oct 20, 9:47 AM ET
BIIB 230P Mar 19	Sweep	17	$34.34K	bullish	Oct 19, 1:16 PM ET
BIIB 220C Jan 15	Large	50	$138.25K	neutral	Oct 16, 3:02 PM ET
BIIB 220C Jan 15	Large	50	$140.30K	neutral	Oct 16, 1:14 PM ET
BIIB 200C Oct 16	Block	20	$66.80K	bearish	Oct 16, 10:02 AM ET

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