Guillaume Rambourg, the star Gartmore fund manager who was suspended earlier this year, has resigned. His departure comes a month after the Financial Services Authority began investigating an internal procedural breach revealed by the firm in April.

A statement from Gartmore to the London Stock Exchange, after markets closed this evening, confirmed Rambourg, who had co-managed the $1.6bn (€1.2bn) Alphagen Capella fund with Roger Guy, had left the firm.