Mortgage-backed security investors remain interested in non-qualified mortgages, though the hot market may be cooling off. A particularly large non-QM MBS from an affiliate of Western Asset Management Company was delayed in closing and downsized slightly as some firms suggest that returns in the market slipped in the first quarter. WAMC’s Arroyo Mortgage Trust 2018-1 was initially sized at $1.25 billion, according to presale reports published near the end of April by ...