BOSTON - ISITC (The International Securities Association for Institutional Trade Communication), the industry trade group focused on standards in transaction processing and related communications, today announced the addition of five new member firms including Advent Software, Mercantil Commercebank, PIMCO and SEI. ?As an association whose success is directly related to member expertise and the idea-sharing that occurs within our network of industry peers, we are thrilled to welcome five new firms,? states Jan E. Snitzer, Chair of ISITC and Vice President at Loomis, Sayles & Co. ?With each new member firm comes a fresh outlook and additional industry insight, which allows ISITC to continue creating and developing best practices and standards that support the global securities industry.? In joining ISITC, new member firms connect with thousands of individuals from hundreds of companies worldwide, including broker/dealers, custodians, investment managers and vendors. All ISITC members have the opportunity to network with peers and influence the direction of key initiatives to achieve greater efficiencies in their firms and throughout the securities industry. This includes the chance to participate in ISITC?s various working groups and industry forums. ?ISITC has a long-standing history of leading industry change, identifying trends, and constantly striving to develop best practices and standards for pre- and post-trade communication,? explains Holly H. Miller, Managing Director, Middle-Office Outsourcing, within SEI?s Investment Manager Services division. ?Participating in this important on-going dialogue has tremendous benefits for our company and our clients, and we encourage other industry participants to join as well.?