Patent ID: 8326737

Claim:
A method of opening an electronic trading venue for trading of a plurality of different securities, the method comprising: receiving by one or more computer systems orders and quotes for the plural, different securities; determining by the one or more computer systems an opening type to open trading in the plural securities; for a first set of the plural securities, executing by the one or more computer systems an opening type by: providing, by the one or more computers from received quotes and orders for the first set of plural securities entered during pre-market hours and orders designated for execution during a normal trading session, unlocked inside bid and offer prices for each of the first set of securities; for a second set of different ones of the plural securities, executing by the one or more computer systems a second, different opening type by: producing opening order imbalance indicators from received eligible orders for the second set of different ones of the plural securities; disseminating the order imbalance indicators over one or more market data feeds, and producing for each security in the second set of different ones of the plural securities a single price to cross eligible orders at market opening.