Audax Private Equity | 19,371 followers on LinkedIn. Purpose built to build businesses | Based in Boston and San Francisco, Audax Private Equity is a leading middle market investment firm with approximately $19 billion of assets under management, over 270 employees, and 100-plus investment professionals. Since its founding in 1999, the firm has invested in more than 170 platforms and 1,300 add-on acquisitions. Through our disciplined Buy & Build approach, across six core industry verticals, Audax helps portfolio companies execute on organic and inorganic growth initiatives that fuel revenue expansion, optimize operations, and significantly increase equity value.