Open interest
Plain definition. Open interest is the number of options contracts that are still outstanding, either across a particular options market or for one options contract, as FINRA explains.
Technical definition. FINRA defines open interest as “the number of outstanding contracts in a particular options market or an options contract.” For options tied to a particular security, the figure can be broken down by puts and calls, by strike price and by expiration date.
On this site
On this site, Open interest comes up in How big is CME XRP futures trading, and how fast has it grown?, Is XRP’s CME futures growth XRP-specific, and how does it compare with bitcoin, ether and Solana? and How do leveraged XRP derivatives, funding rates and liquidations move XRP’s price?.
Source
Options | FINRA.org (finra.org), read October 1, 2026.