PEN Open Interest
Penumbra Inc (PEN) had 13.41K open option contracts as of Nov 4, 2026: 3.25K calls and 10.16K puts. Open interest rose 8.6% over the past four weeks. The put/call open interest ratio is 3.12, so puts outnumber calls.
Open Interest by Strike
Showing results for PEN, 2026-11-20(m), calls & puts
Open Interest Stats
Showing results for PEN, 2026-11-20(m), calls & puts
| Call Open Interest Total | |
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| Put Open Interest Total | |
| Open Interest Total | |
| Put-Call Open Interest Ratio |
Highest Open Interest Options
Showing results for PEN, 2026-11-20(m), calls & puts
Open Interest Total by Expiry
Showing results for PEN, 2026-11-20(m), calls & puts. View all expiries
Open Interest History
Showing daily totals for PEN, all expirations, calls & puts. View full history
PEN 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 PEN have?
Penumbra had 13.41K open option contracts as of Nov 4, 2026. Over the past 30 days, open interest averaged 12.7K contracts.
Is PEN open interest rising or falling?
Open interest rose 8.6% over the past four weeks. It was 12.34K contracts on Oct 7, 2026. See the PEN open interest history for a longer view.
What is the PEN put/call open interest ratio?
The Penumbra put/call open interest ratio was 3.12 as of Nov 4, 2026. Four weeks earlier it was 2.09.
What is Penumbra Inc?
Domiciled in the US, Penumbra designs, manufactures, and markets an array of thrombectomy and embolization devices and equipment to mechanically remove blood clots.