BIIB Open Interest
Biogen Inc (BIIB) had 59.41K open option contracts as of Nov 4, 2026: 29.78K calls and 29.63K puts. Open interest rose 46.0% over the past four weeks. The put/call open interest ratio is 1.00, so calls and puts are about even.
Open Interest by Strike
Showing results for BIIB, 2026-11-06(w), calls & puts
Open Interest Stats
Showing results for BIIB, 2026-11-06(w), calls & puts
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Highest Open Interest Options
Showing results for BIIB, 2026-11-06(w), calls & puts
Open Interest Total by Expiry
Showing results for BIIB, 2026-11-06(w), calls & puts. View all expiries
Open Interest History
Showing daily totals for BIIB, all expirations, calls & puts. View full history
BIIB Open Interest FAQ
What is open interest?
Open interest is the number of option contracts that are open and not yet closed, exercised, or expired. The Options Clearing Corporation calculates it once a day from the previous day's trades, and it is published before the market opens.
How much open interest does BIIB have?
Biogen had 59.41K open option contracts as of Nov 4, 2026. Over the past 30 days, open interest averaged 47.85K contracts.
Is BIIB open interest rising or falling?
Open interest rose 46.0% over the past four weeks. It was 40.69K contracts on Oct 7, 2026. See the BIIB open interest history for a longer view.
What is the BIIB put/call open interest ratio?
The Biogen put/call open interest ratio was 1.00 as of Nov 4, 2026. Four weeks earlier it was 0.79.
What is Biogen Inc?
Biogen is an established biopharmaceutical company focused on treatments for neurodegenerative and rare diseases.