Juliet Peterson will take up the role from September 1.
Tracey Kai will begin her new role on July 10.
New investors will sit on board of financial markets brokerage.
Chief executive to depart by end of the year after 15 years.
Joining the board of directors are Robert Ferris as an independent director and Amy Johnson as a future director.
Paul Bevin has extensive experience in the investment management and superannuation industry.
Lindsay Zwart and Steven Joyce join the board.
Justin Mercer has been interim CEO since the departure of previous CEO Charlotte Walshe in February.
Philip Goodman has been promoted to partner within the Christchurch business advisory team.
The three associates are Joel Murphy, Jeremy Sparrow and Tim Conder.