Bennett said while the employer super funds represented the "mature" side of the business compared to KiwiSaver, there was still scope for growth in both arms.
He said the NZX planned to grow the business through Superlife's existing employer networks and also via direct retail and financial adviser channels, which neither parties have excelled at.
However, the real reason NZX paid $20 million (and up to $35 million pending performance hurdles) for Superlife was to kickstart its ETF business, which has languished for years.
Bennett said the NZX would launch a new range of ETFs (a couple launched today tracking Australian property and high dividend-paying company indices) covering debt and equity in both domestic and global markets. Superlife funds will eventually tip into the NZX ETFs (still under the Smartshares label) - some sooner than others.
Superlife invests mainly on a passive basis, running domestic equities in-house while global shares and debt are outsourced to Vanguard, State Street with a sprinkling of iShares (owned by the world's biggest fund manager, Blackrock). The new NZX ETF range will replace all of these in time, Bennett said.
He said with more scale and choice ETFs should experience the same growth in New Zealand that occurred in offshore markets. According to Bennett, the extra scale will also enable Smartshares to reduce its ETF fees, which have routinely been criticised as too high.
"We've done a fee review and have responded [to market criticisms] and that will be reflected in the products we launch this week," he said.
It is understood another former high-profile investment executive is also close to launching a purely-index KiwiSaver scheme, which would indicate there's a bit of action to come in the passive business.