Most KiwiSaver funds posted negative returns in the first three months of this year after a drop in share markets around the world, according to Morningstar.
The S&P/NZX 50 dropped 0.9 per cent in the first quarter while global shares fell 2.7 per cent in the MSCI Global Index.
Chris Douglas, Morningstar's manager of research ratings, said volatility had returned to global markets during the first quarter of 2018 and the strong performance of share markets around the world came to an abrupt halt.
"As a result, any KiwiSaver Scheme with a bias to equities was more likely to post a negative result," he said.
The average return for the conservative category was just 0.37 per cent while the average for the aggressive growth sector, which invest the most in shares, was a loss of 2.58 per cent.
But the rough ride for the quarter was not enough to pull one-year returns into the red.