The money held in retail and wholesale superannuation increased by 8.2 per cent ($92 billion) throughout 2017-18 to hit $1.2 trillion, said DEXX&R.
NAB saw the largest increase throughout the 12 months to 20 June 2017, up 9.4 per cent to $166.1 billion.
AMP was second (up 5.9 per cent to $156.8 billion) followed by CBA (up 6.2 per cent to $147 billion).
Westpac and Macquarie rounded out the top five, with increases of $144.5 billion and $104.7 billion, respectively.
The retirement incomes sector saw outflows from allocated pensions increase by 97 per cent to $17.3 billion throughout the June 2017 quarter, said DEXX&R.
"Allocated pension net cash flow has now been negative in each of the past four quarters," said the researcher.
"Total FUM/A in the retirement incomes segment decreased by 2.8 per cent [$5.4 billion] to $187.7 billion at June 2017, down from $193.1 billion at March 2017."
