Complex Order Auction (COA) on Cboe Options Exchange (C1 only)

COA on C1 functions the same as it does on C2, EDGX, and BZX with the following differences:

• COA has separate priority configuration from the COB (i.e., COA can be P/T and COB can be Pro Rata for Class).
• Resting orders on the Complex Book arriving before the start of a COA auction will have the same priority as Complex orders and Response orders arriving after the start of the COA auction.
• COA auctions are allowed to start and execute through AON orders on the Simple Book.
• COA auction messages are displayed on both the Complex Auction Feed and Pitch Feed.