PennyMac Mortgage Investment Trust started issuing non-agency MBS in November as part of an effort to boost its investments in credit-sensitive assets. The REIT is now one of the most active players in the space.
Researchers tracked ratings and defaults on non-agency MBS between 2013 and 2022, finding that Morningstar’s ratings were more conservative than ratings from the big three firms. However, Morningstar’s ratings produced more “false alarms” about potential defaults than the big firms.
The share of GSE purchase mortgages with credit scores of at least 740 increased from 73.8% in the first quarter of 2025 to 74.6% in the second quarter.