Open-Close Cboe C2 exchange
Open-Close data is a volume summary file of trading activity on the C2 exchange that summarizes the volume (contracts traded) by origin (customer and firm orders only), original order size and the opening or closing position of the order. The Open-Close volume is further broken into categories of buy/sell, open/close and order size "buckets". The data currently goes back to 1/2/2018 and contains all series in an underlying security's chain-if it has volume.
To see the Open-Close data file format please refer to the specifications below: