ONTO Open Interest
Onto Innovation Inc (ONTO) had 16.15K open option contracts as of Nov 4, 2026: 9.3K calls and 6.85K puts. Open interest rose 22.8% over the past four weeks, and is ONTO's highest level in 4 weeks. The put/call open interest ratio is 0.74, so calls outnumber puts.
Open Interest by Strike
Showing results for ONTO, 2026-11-20(m), calls & puts
Open Interest Stats
Showing results for ONTO, 2026-11-20(m), calls & puts
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Highest Open Interest Options
Showing results for ONTO, 2026-11-20(m), calls & puts
Open Interest Total by Expiry
Showing results for ONTO, 2026-11-20(m), calls & puts. View all expiries
Open Interest History
Showing daily totals for ONTO, all expirations, calls & puts. View full history
ONTO 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 ONTO have?
Onto Innovation had 16.15K open option contracts as of Nov 4, 2026. Over the past 30 days, open interest averaged 14.23K contracts.
Is ONTO open interest rising or falling?
Open interest rose 22.8% over the past four weeks, and is ONTO's highest level in 4 weeks. It was 13.16K contracts on Oct 7, 2026. See the ONTO open interest history for a longer view.
What is the ONTO put/call open interest ratio?
The Onto Innovation put/call open interest ratio was 0.74 as of Nov 4, 2026. Four weeks earlier it was 0.57.
What is Onto Innovation Inc?
Onto Innovation Inc is engaged in the design, development, manufacture, and support of high-performance control metrology, defect inspection, lithography, and data analysis systems used by microelectronics device manufacturers.