New Zealand Superannuation Fund chief investment officer Matt Whineray will take over as acting chief executive when Adrian Orr leaves to take up his new role as governor of the Reserve Bank in March.
Last month, the fund said it aimed to replace Orr by mid-May and issued a tender document to find a recruitment agency to find that person.
Applications for the recruitment job "are still being reviewed", before a global search kicks off in an appointment process expected to "take a number of months", it said.
Whineray will start the acting CEO role from mid-March and general manager portfolio completion Mark Fennell will become acting chief investment officer for the duration of the recruitment process.
The new chief executive will oversee the $37.9 billion fund, which has had a 10.5 per cent average annual rate of return since inception, before tax and after costs, and a workforce of approximately 140 people, including 55 investment professionals.