He will initially focus on PaySauce becoming the leading payroll provider for Australian dairy farms.
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.
Justin Mercer has been interim CEO since the departure of previous CEO Charlotte Walshe in February.
Lindsay Zwart and Steven Joyce join the board.
Philip Goodman has been promoted to partner within the Christchurch business advisory team.
The three associates are Joel Murphy, Jeremy Sparrow and Tim Conder.
'Nishida-san is known to be passionate about fund managers being good custodians of investor money.'