Symbol Ranges and Units

Symbols will be separated into units by a published alphabetical distribution. Symbol distribution will not change intra-day. Cboe does, however, reserve the right to change the symbol distribution with prior notice to members. Care should be taken to ensure that symbol distribution changes can be supported easily.

The Kafka topic for the TOP feed is partitioned by unit, which means that messages from the same unit will be received in the order they were produced.