Carlyle, a global investment firm with deep industry that deploys private capital across its business, agreed to acquire a minority stake in Quest Global, an engineering research and development services company, from Bain Capital, a private investment firm that specializes in private equity, venture capital, credit, public equity, and Advent International, a private equity firm that invests in business and financial services, for $500m. "At Quest Global, we believe engineering has the unique opportunity to solve the problems of today that stand in the way of tomorrow – to create a brighter future. It was a great value-added partnership with Carlyle the first time around, and I look forward to working with Carlyle again, to propel us in the journey ahead. Together, I am confident we will deliver on our mutual commitment to provide cutting-edge engineering solutions to our clients around the world, while preserving our entrepreneurial culture," Ajit Prabhu, Quest Global Chairman and CEO.