Bradbury is to take on the newly created role of head of equities and will also join the board at OMAM.
Management of the UK mid-cap select fund will pass to deputy Richard Watts while Luke Kerr takes on the UK specialist equity hedge fund.
Watts and Kerr will start their roles in 2009, with UK select smaller companies manager Dan Nickols taking Bradbury’s position as head of the UK mid and small-cap team.
Bradbury will focus on the broader strategy and management of the business. He will continue to chair the monthly UK mid and small-cap team strategy meetings.
Meanwhile, Old Mutual chief investment officer Eoin Murray is to leave the group.
Hargreaves Lansdown investment manager Ben Yearsley says: “Ashton has been the head of the team for some time and the group does have a number of great managers that it is starting to bring through.”