PRTA Open Interest
Prothena Corporation plc (PRTA) had 9.35K open option contracts as of Nov 4, 2026: 7.07K calls and 2.28K puts. Open interest rose 19.3% over the past four weeks. The put/call open interest ratio is 0.32, so calls outnumber puts.
Open Interest by Strike
Showing results for PRTA, 2026-11-20(m), calls & puts
Open Interest Stats
Showing results for PRTA, 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 PRTA, 2026-11-20(m), calls & puts
Open Interest Total by Expiry
Showing results for PRTA, 2026-11-20(m), calls & puts. View all expiries
Open Interest History
Showing daily totals for PRTA, all expirations, calls & puts. View full history
PRTA 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 PRTA have?
Prothena had 9.35K open option contracts as of Nov 4, 2026. Over the past 30 days, open interest averaged 8.24K contracts.
Is PRTA open interest rising or falling?
Open interest rose 19.3% over the past four weeks. It was 7.84K contracts on Oct 7, 2026. See the PRTA open interest history for a longer view.
What is the PRTA put/call open interest ratio?
The Prothena put/call open interest ratio was 0.32 as of Nov 4, 2026. Four weeks earlier it was 0.51.