Correction: Genworth and NAB 23 February 2015 4:55PM Banking Day staff Genworth is not the only mortgage insurance provider to National Australia Bank. An article in Banking Day last Friday stated incorrectly that Genworth was NAB's sole LMI supplier.For NAB, Genworth underwrites the high loan to valuation loans sourced through brokers. This is about 45 per cent of the bank's HLVR business, according to Genworth.QBE insures the loans sourced through the branch network (around 55 per cent).