Super Fund chief investment officer Matt Whineray said Mint was a welcome addition to its "stable of managers". These managers trade equities to help grow the Super Fund's assets.
Devon Asset Management also has an active equity mandate with the Super Fund, which has $29.6 million of funds under management.
Mint, established in 2006, is based in Auckland and is led by chief executive Rebecca Thomas.
Milford Asset Management also held a similar mandate but it was suspended when the Financial Markets Authority began probing the fund's manager for alleged market manipulation.
Last month, Milford announced it would pay a $1.5 million settlement. The Milford portfolio manager at the centre of this probe was not a party to the settlement and still faces potential action from the regulator.