A supply chain financing company with its roots in regional Queensland, Greensill, has become the country's next $1 billion-plus unicorn, thanks to a $US250 million ($336 million) capital injection from growth equity firm General Atlantic, which also creates the country's newest rich listers.

Greensill, founded in 2011 in London by Bundaberg-born farmer Lex Greensill, 41, provides businesses in industries from telecommunications to manufacturing with working capital based on their invoices, allowing them to be paid faster and fulfil the work, without shortening payment terms for buyers.