The nearest expiration date for ID x IPCA Spread Futures is Jun 17, 2024.
Traders prefer to sell futures contracts when they've already made money on the investment, but still have plenty of time left before the expiration date. Thus, many consider it a good option to sell ID x IPCA Spread Futures before Jun 17, 2024.
Open interest is the number of contracts held by traders in active positions — they're not closed or expired. For ID x IPCA Spread Futures this number is 12.96 K. You can use it to track a prevailing market trend and adjust your own strategy: declining open interest for ID x IPCA Spread Futures shows that traders are closing their positions, which means a weakening trend.