Kane Patena will replace Keith Manch on September 1.
Mat Bolland comes from a role as general manager corporate and regulatory affairs at 2degrees.
Vivek Rajendran will commence his role as chief executive on Monday March 29.
Nicky comes to the new general manager post from a consulting role with MartinJenkins.
Nadine Bell will be based in Auckland and commences her role in mid-April.
Fund management expert Rebecca Thomas will replace Sir Henry van der Heyden on the board.
Andrew Peskett will be acting chief executive from April 1, until Earl Gasparich takes over this year.
Currently chief distribution officer, Adrian Riminton will move into the CRO role from April 1, 2021.
Brent Pattison joined Oceania as its chief financial officer in January 2020.
Kim Hegarty has been appointed to the newly created role.