Introduction

This specification will be the standard specification used for market data for FLEX Options on the Cboe Options (C1) Exchange platform.

Cboe customers may use the FLEX feed to receive real-time auction updates and execution information.

Options FLEX feed cannot be used to enter orders. For order entry, refer to the US Options FIX Specification.

A WAN-Shaped version of the FLEX feed is available from both of Cboe’s datacenters. Customers may choose to take one or more of the following FLEX feed options depending on their location and connectivity to Cboe.