Cofunds head of fund group relations Michelle Woodburn is stepping down from the role after six years with the platform.
Cofunds confirmed Woodburn would no longer continue in the current role but declined to comment further.
Woodburn's exit is the latest in a series of high profile departures from the platform.
Cofunds chief executive Martin Davis announced he would be leaving the role in May.
Managing director of operational services Stephen Mohan left in April after seven years in the role.
Human resources director Vivienne Hole's departure was also confirmed last week.
Caring for children and elderly relatives
Similar to June 2007
Square Mile’s series of informal interviews
Fine reduced to £60,000
Two roles created