Net contribution flows for entities with more than four members during the June 2015 quarter were $12.7 billion, while the rate of return for the same group was -1.7 per cent.

Breaking down the $2 trillion superannuation industry, APRA-regulated funds accounted for $1.25 trillion and the ATO-regulated SMSF sector accounted for $589.9 billion.

Exempt schemes and the balance of life office statutory funds accounted for $130.8 billion and $55.8 billion, respectively.

Total assets in MySuper products totalled $428.0 billion at the end of the June 2015 quarter, according to APRA.

Over the 12 months from June 2014 there was an 18.2 per cent increase in total assets in MySuper products, the regulator said.

APRA also gave a breakdown of the asset allocation of the superannuation industry.

"As at the end of the June 2015 quarter, 51 per cent of the $1.3 trillion investments for entities with at least four members were invested in equities; with 24 per cent in Australian listed equities, 23 per cent in international listed equities and 5 per cent in unlisted equities," APRA said in its report.

"Fixed income and cash investments accounted for 32 per cent of investments; 19 per cent in fixed income and 13 per cent in cash.

"Property and infrastructure accounted for 12 per cent of investments and 4 per cent were invested in other assets, including hedge funds and commodities," said APRA.