On August 19 Macquarie Securitisation (Macquarie) launched a new A$500 million (US$448.35 million) residential mortgage-backed securities (RMBS) transaction in what is likely to be the third such deal in a little more than a week, with market sources expecting more to follow. The transaction – PUMA Masterfund P-16 Series – will be the sponsor's first public issue in more than two years, and is expected to price early next week.