SME invoice financing startup Butn set to go public in $20 million ASX listing Butn co-founders Walter Rapoport and Rael Ross. Source: supplied. Aussie invoice financing fintech Butn is set to list on the ASX tomorrow in a $20 million float, giving it a market cap of $80 million on debut. Headed up by co-founders and co-chiefs Rael Ross and Walter Rapoport, Butn offers advances on payments for small businesses, including on commissions and invoice payments, through a platform integrated into their existing CRMs. Trading under the code BTN, the startup is set to raise $20 million, with a share price of $0.50. On launch, that will give the business a market cap of $80 million.