BIIB Unusual Option Activity
Biogen Inc (BIIB) option volume on Nov 4, 2026 was 4.4% of open interest, below the 20-day average of 6.5%. Calls made up 63.8% of the volume.
BIIB Unusual Options FAQ
What makes option activity unusual?
Option activity is usually called unusual when a contract trades much more volume than its open interest, which can mean traders are opening new positions.
Is BIIB seeing unusual options activity?
On Nov 4, 2026, Biogen options traded 2.63K contracts against 59.41K open, a volume to open interest ratio of 0.04, below its 20-day average. The table above lists the contracts with the highest ratios.
Are BIIB traders trading more calls or puts?
Calls made up 63.8% of Biogen option volume on Nov 4, 2026, a put/call ratio of 0.57, so calls outnumber puts. The BIIB option volume chart shows calls and puts by strike.
What is Biogen Inc?
Biogen is an established biopharmaceutical company focused on treatments for neurodegenerative and rare diseases.