Order Book Official

DEFINITION of 'Order Book Official'

A trading floor participant responsible for maintaining a list of public market or limit orders of a specific option class using the "market-marker" system of executing orders.

BREAKING DOWN 'Order Book Official'

The term can also sometimes be used in reference to a current list of public market or limit orders for a given exchange. For example, a list of specific public orders awaiting execution on the Chicago Board Options Exchange could be referred to as the "order book official".