The fund and other mandates will be managed by the Artemis Income team led by Citywire AA-rated Adrian Frost.
Artemis senior partner Mark Murray said: 'In his time with us, Adrian has made a considerable contribution to Artemis. He will leave with our thanks and very best wishes.'
Over five years to the end of May, Gosden has returned 50.12% within UK Equity Income sector while the Citywire sector average manager was up 51.14%.
Prior to Artemis, Gosden managed a number of accounts for institutional clients and co-managed the retail SocGen UK Income fund with Nicola Horlick.