NEW YORK–(BUSINESS WIRE)–Kroll Bond Rating Agency (KBRA) assigns preliminary ratings to 9 classes of mortgage pass-through certificates from J.P. Morgan Mortgage Trust 2017-5 (JPMMT 2017-5), a prime jumbo RMBS transaction. The JPMMT 2017-5 mortgage pool comprises 705 first-lien residential loans with an aggregate principal balance of $671,686,643 as of the cut-off date. The collateral consists entirely of hybrid adjustable rate mortgages (ARMs), with initial fixed-rate periods of five (14.0%)