"Pleasingly, all KiwiSaver funds managed to produce positive returns over the year across the multisector categories," Douglas said.
The average return for conservative KiwiSaver funds over the year to March 31 was 4.37 per cent, while the average for the balanced sector was 6.6 per cent.
The growth sector averaged 7.58 per cent while the aggressive growth category had the highest average return at 8.81 per cent for the year.
Morningstar's quarterly report shows the amount of money invested in KiwiSaver has risen from $38.8 billion to $46.5 billion over the year.
ANZ remains the largest provider with a 25 per cent share of the market and $11.7 billion in funds under management.
ASB is the second largest with a market share of 18.3 per cent and $8.5 billion and Westpac is third largest at 12 per cent with $5.6 billion.