SYSTEMS AND METHODS RELATED TO LIQUIDITY AGGREGATION

One exemplary aspect comprises a method comprising: (a) receiving data indicating that one or more orders for a specific security in one or more trading systems are available for aggregation into a potential block of at least a specific size; (b) transmitting data sufficient to enable a trading interface in communication with a first trading system to display an indication of the existence of the potential block and that at least some orders in the block originated from a second trading system in the one or more trading systems, the second trading system being separate from the first trading system; and (c) receiving from the trading interface a contra order in the first trading system that crosses the potential block. Other aspects comprise related computer system, components, and software.