CENX Open Interest
Century Aluminum Co (CENX) had 64.13K open option contracts as of Nov 4, 2026: 45.45K calls and 18.68K puts. Open interest rose 55.1% over the past four weeks, and is CENX's highest level in 12 weeks. The put/call open interest ratio is 0.41, so calls outnumber puts.
Open Interest by Strike
Showing results for CENX, 2026-11-20(m), calls & puts
Open Interest Stats
Showing results for CENX, 2026-11-20(m), calls & puts
| Call Open Interest Total | |
|---|---|
| Put Open Interest Total | |
| Open Interest Total | |
| Put-Call Open Interest Ratio |
Highest Open Interest Options
Showing results for CENX, 2026-11-20(m), calls & puts
Open Interest Total by Expiry
Showing results for CENX, 2026-11-20(m), calls & puts. View all expiries
Open Interest History
Showing daily totals for CENX, all expirations, calls & puts. View full history
CENX 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 CENX have?
Century Aluminum had 64.13K open option contracts as of Nov 4, 2026. Over the past 30 days, open interest averaged 48.29K contracts.
Is CENX open interest rising or falling?
Open interest rose 55.1% over the past four weeks, and is CENX's highest level in 12 weeks. It was 41.35K contracts on Oct 7, 2026. See the CENX open interest history for a longer view.
What is the CENX put/call open interest ratio?
The Century Aluminum put/call open interest ratio was 0.41 as of Nov 4, 2026. Four weeks earlier it was 0.67.
What is Century Aluminum Co?
Century Aluminum Co produces primary aluminum standard grade and value-added products.