The move forms part of a wider comms restructure, which has seen PR split between internal and external.
Gill O'Donoghue, former asset management comms director, is now internal comms head. Both Dixon and O'Donoghue report to Gary Mairs, MD at CMIM.
Dixon was formerly a director at financial services PR specialist Vanbrugh Financial Communications until last November, when she was made redundant.
Dixon will head a two-strong team at CMIM, formed from the merger of the original CMIM business, Halifax fund manager and Equitable Life's investment division.
Part of her remit is to manage CMIM's ongoing agency pitch, which kicked off earlier this year (PRWeek, 15 February), for the firm's six-figure fee PR business.