Advent Software, Inc. (NASDAQ: ADVS), a leading provider of software and services for the global investment management industry, today announced that it has seen more than 50% growth in its outsourcing client base over the past two years. The Company has nearly 500 clients leveraging its outsourcing services, which are now available under a services offering called Advent OnDemand(SM). Advent OnDemand(SM) delivers Advent's award-winning suite of investment solutions via a SaaS (software-as-a-service) model, with or without full business process outsourcing (which includes account aggregation, reconciliation and reference data management.)