Maximum Open Order Limits

The exchange limits the maximum number of open orders allowed on a BOE or BOE Quote port to 200,000 per port. New orders will be rejected once this limit is breached until the number of open orders drops back below 200,000. Note this limit is only for orders and does not include open quotes sent over a BOE Quote port.

Cboe Titanium U.S. Options BOEv3 Specification - Maximum Open Order Limits | Cboe