Freddie Mac announced today that it has obtained a half-billion dollar insurance policy – its largest to date – under its Agency Credit Insurance Structure (ACIS) program. Through ACIS, Freddie Mac buys insurance policies that transfer to insurance and reinsurance companies around the world, a portion of the credit risk associated with its Structured Agency Credit Risk debt note reference pools.

This transaction transfers much of the remaining credit risk associated with the second actual loss STACR offering last June. This policy transfers up to a combined maximum limit of approximately $502.6 million of losses on a pool of single-family loans acquired from August to November 2014.

With this transaction Freddie Mac has acquired more than $1.5 billion in insurance coverage this year with seven ACIS transactions and more than $2.4 billion since the program’s inception.

Kevin Palmer, vice president of Freddie Mac’s single-family strategic credit costing and structuring, said in a statement he was pleased with the purchase.

“The size of this transaction reflects the continued significant interest from the industry and demonstrates that the insurance sector has strong, deep capacity for this risk,” Palmer wrote.

Through STACR and ACIS, Freddie Mac has laid off a substantial portion of credit risk on more than $333 billion of UPB in single-family mortgages.