ACLS Open Interest
Axcelis Technologies Inc (ACLS) had 6.69K open option contracts as of Nov 4, 2026: 4.16K calls and 2.53K puts. Open interest rose 2.5% over the past four weeks. The put/call open interest ratio is 0.61, so calls outnumber puts.
Open Interest by Strike
Showing results for ACLS, 2026-11-20(m), calls & puts
Open Interest Stats
Showing results for ACLS, 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 ACLS, 2026-11-20(m), calls & puts
Open Interest Total by Expiry
Showing results for ACLS, 2026-11-20(m), calls & puts. View all expiries
Open Interest History
Showing daily totals for ACLS, all expirations, calls & puts. View full history
ACLS 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 ACLS have?
Axcelis Technologies had 6.69K open option contracts as of Nov 4, 2026. Over the past 30 days, open interest averaged 6.46K contracts.
Is ACLS open interest rising or falling?
Open interest rose 2.5% over the past four weeks. It was 6.53K contracts on Oct 7, 2026. See the ACLS open interest history for a longer view.
What is the ACLS put/call open interest ratio?
The Axcelis Technologies put/call open interest ratio was 0.61 as of Nov 4, 2026. Four weeks earlier it was 0.55.
What is Axcelis Technologies Inc?
Axcelis Technologies Inc designs, manufactures, and services ion implantation and other processing equipment used in the fabrication of semiconductor chips.