Australia's nascent love affair with emerging technology businesses is showing no signs of abating, following a bumper quarter for investment into start-ups, and a record year for fundraising by local venture capital firms.

Investors tipped $US231.4 million ($300 million) into Australian start-ups in the June quarter, according to data released by KPMG on Thursday. That was the heaviest quarter for start-up investment in three years, and the second-heaviest quarter since 2012 when KPMG started tracking these figures.