CQS CEO Xavier Rolet joined the $18 billion London-based hedge fund in December 2018 after taking a year off following his near decade-long run atop the London Stock Exchange. Rolet spoke with Business Insider about his growth strategy and focus on creating "bespoke strategies." A multi-billion London-based hedge fund wants to expand its presence in the United States, and thinks customized strategies built for specific investors is the way to do it.