Two of Australia's non-bank mortgage originators have hit their securitisation investors this week, raising more than A$1.6 billion for further lending operations.Columbus Capital, an NBFI with Malaysian links, has settled its largest prime residential mortgage-backed securitisation - and the third in its Triton Bond Series for 2019. The $1 billion transaction had National Australia Bank as arranger and also one of the joint lead managers, alongside Standard Chartered PLC, Sumitomo Mitsui Banking Corporation, Natixis, and Westpac Banking Corporation.Key features of the deal are:•    Standard & Poor's and Fitch have rated 96 per cent of the bonds as AAA;•    credit support is provided by subordination; and•    lenders' mortgage insurance covers 55 per cent of the loans in the portfolio.Andrew Chepul, chief executive officer of Columbus Capital, said his firm issued $2.45 billion in mortgage-backed securitisations in the 2019 year alone."As a wholesale funder, this transaction will benefit our wholesale distribution network, meet demand and provide continued support to our mortgage managers via our Origin Mortgage Management Services platform and the growth of Homestar Finance, acquired in October 2018," Chepul said.And Columbus is getting bigger, "the business exceeding its target of $5 billion in assets under management," Chepul said.Pepper Group's fourth RMBS transaction for 2019 - issued via Pepper Residential Securities Trust No. 25 - was also finalised this week. The transaction is a securitisation of residential mortgage loans originated and serviced by Pepper.Moody's Investors Service assigned its Aaa (sf) ratings to the equivalent of about A$644 million in securities, denominated in three currencies, with key transactional features as follows:•    US$150.0 million Class A1-u Notes, which will amortise in full over a period of 56 months.•    A$161.4 million Class A1-a Notes•    EUR100.0 million Class A1-G (EUR) Notes, issued in accordance with Pepper's Green Bond Framework.•    A$100.0 million Class A2 Notes.The $42.3 million Class B, $23.0 million Class C, $16.5 million Class D, $10.0 million Class E, $7.0 million Class F and $7.5 million Class G Notes were not rated by Moody's. According to a Moody's media note, almost 21 per cent of the portfolio includes loans to borrowers with prior credit impairment (default, judgment or bankruptcy) and loans underwritten on an alternative documentation basis (40.0 per cent).The portfolio has a low weighted-average seasoning of just 4.6 months, with 82 per cent of loans originated in the last six months, while 34 per cent of loans have LTV ratios above 80 per cent.