Strong share markets have helped push the amount of money invested in KiwiSaver to more than $60 billion - a rise of nearly 18 per cent in the past year.
Figures from Morningstar shows as of September 30 there was $60.9b in the retirement savings scheme, up from $51.7b a year earlier.
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Tim Murphy, director of manager research Asia-Pacific for Morningstar, said all but one of the KiwiSaver funds in its survey made positive returns in the three months to September 30 after a strong run in markets.
"The September quarter saw markets continue to rally, returns of KiwiSaver funds generally reflected the strength of underlying market conditions."