Mellon Financial Corporation was an investment firm which was once one of the world's largest money management firms. Based in Pittsburgh, Pennsylvania, it was in the business of institutional and high-net-worth individual asset management, including the Dreyfus family of mutual funds, business banking, and shareholder and investor services. On December 4, 2006, it announced a merger agreement with Bank of New York, to form BNY Mellon. After regulatory and shareholder approval, the banks completed the merger on July 2, 2007.