$SPX Open Interest
S&P 500 Index ($SPX) had 25.18M open option contracts as of Nov 6, 2026: 10.34M calls and 14.84M puts. Open interest rose 6.9% over the past four weeks, and is $SPX's highest level in 4 weeks. The put/call open interest ratio is 1.43, so puts outnumber calls.
Open Interest by Strike
Showing results for $SPX, 2026-11-09(w), calls & puts
Open Interest Stats
Showing results for $SPX, 2026-11-09(w), 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 $SPX, 2026-11-09(w), calls & puts
Open Interest Total by Expiry
Showing results for $SPX, 2026-11-09(w), calls & puts. View all expiries
Open Interest History
Showing daily totals for $SPX, all expirations, calls & puts. View full history
$SPX 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 $SPX have?
$SPX had 25.18M open option contracts as of Nov 6, 2026. Over the past 30 days, open interest averaged 23.82M contracts.
Is $SPX open interest rising or falling?
Open interest rose 6.9% over the past four weeks, and is $SPX's highest level in 4 weeks. It was 23.55M contracts on Oct 9, 2026. See the $SPX open interest history for a longer view.
What is the $SPX put/call open interest ratio?
The $SPX put/call open interest ratio was 1.43 as of Nov 6, 2026. Four weeks earlier it was 1.44.