Key-man risk is a perennial concern of any fund management firm and there is no better example than the tale of Guillaume Rambourg and Gartmore. At one point Rambourg and his longstanding co-portfolio manager Roger Guy accounted for around 40% of Gartmore’s fee revenue.

Despite efforts to reduce dependence on them before the firm went public in December 2009, they were synonymous with Gartmore's hedge fund business.