Another highlight last week was the fourth mortgage-backed securities issue for the year; this time from ME Bank via SMHL Securitisation Fund 2010-1. ME Bank last issued in November 2009 via SMHL Securitisation Fund 2009-3, selling A$782 million of RMBS on that occasion.ME Bank was again able to upsize the issue from an initial A$500 million, but only to A$673 million this time. However, the pricing was five basis points tighter on the equivalent senior tranche.The three-tranche issue comprised: A$643.5 million of Class A notes, rated 'AAA' with a 2.6-year weighted average life, priced at 135 bps over bank bills; A$17 million of Class AB notes, rated 'AAA' with a 7.2-year weighted average life, priced at 180 bps over bank bills; and A$12.5 billion of Class B notes, rated 'AA-' with a weighted average life of 7.2 years.The Australian Office of Financial Management took up A$250 million of the Class A notes. It took up the same volume in Bank of Queensland's slightly larger issue in early February.  Momentum is building in the RMBS sector. The Financial Review reported on Thursday that Aussie Home Loans has already half filled a A$1.0 billion warehouse facility provided by Commonwealth Bank.Macquarie Bank, however, through Puma Securitisation, remains (as it has for more than 15 years) the manager of the Aussie Home Loans home loans. Aussie's executive chair, John Symond, confirmed to the newspaper the loans would be refinanced through mortgage-backed securities, which were once the staple of the firm's finances.Macquarie is also likely to chip loans originated through its own network, and through Australian Finance Group and the new aggregator Vox when it returns to market through Puma.Finally it is interesting to note that Mortgage Choice is also casting around for a funder for a "home brand" style home loan (a development reported in an interview with Mortgage Choice CEO Michael Russell today in The Australian).