RCM's head of equities in Australia, Jakov Males, has resigned to take up a role at UBS.
As an interim move, current head of research Greg Garton will take on the role.
"We are currently reviewing our options," a spokesperson for RCM said.
RCM is part of the Allianz Global Investors (AllianzGI) group currently going through a restructuring of its Australian operations.
The AllianzGI stable includes managers RCM, Oppenheimer Capital and Nicholas Applegate who will now become stand alone divisions within the group.
