Large block trading

A method comprising:

• receiving, from a first server operated on behalf of a first trader, a communication including a first trade order and one or more selection criteria, the first trade order including at least one of a specified instrument, a specified quantity, and a specified price;
• determining that a database of trade orders does not contain a second trade order matching the first trade order;
• identifying a plurality of second traders satisfying the selection criteria;
• sending, to a plurality of second servers, each second server operated on behalf of one or more of the plurality of second traders, a query including at least one of the specified instrument, the specified quantity, and the specified price;
• receiving, from a one of the plurality of second servers operated on behalf of a one of the plurality of second traders, a positive response to the query;
• and
• facilitating execution of a trade between the first trader and the one of the plurality of second traders for the specified instrument at the specified price.