NEW YORK--(BUSINESS WIRE)--Kroll Bond Rating Agency (KBRA) assigns preliminary ratings to 11 classes of notes from Freddie Mac Structured Agency Credit Risk (STACR) 2015-HQA1, a risk transfer securitization consisting of a $19.4 billion reference pool with 89,103 mortgages. STACR 2015-HQA1 represents the first credit risk transfer transaction featuring both actual loss exposure and loans with original loan-to-value (LTV) ratios greater than 80% but less than or equal to 95%. This is also the th