ConvergEx, a leading provider of investment and execution technology solutions to institutional clients worldwide, today announced that it has been selected by Mahogany Partners LLC, a consortium of independent NYSE broker-dealers, to build a full line of advanced electronic block trading technologies. Under the terms of the agreement, ConvergEx will develop a suite of electronic trading products to enhance the consortium members' block trading capabilities. For the first component, ConvergEx will build advanced blotter polling tools that will give Mahogany's members a powerful way to access external block liquidity as well as electronically cross block trades among themselves. This represents the first time anonymous blotter polling functionality has been made available to NYSE independent floor brokers. The blotter polling functionality, along with each additional tool ConvergEx builds for Mahogany, will all be accessible through an aggregated user interface.