Mercury chief executive, Vince Hawksworth, will retire from his role on Aug 31.
The company's current executive general manager generation, Stew Hamilton, has been appointed as Hawksworth's successor.
Hamilton will take on the chief executive position after working closely with Hawksworth during the transition period.
Mercury chair, Scott St John, praised Hawksworth for his leadership and said the board's decision to appoint Hamilton was a result of focused succession planning.
