NEW YORK--(BUSINESS WIRE)--Fitch Ratings has affirmed 12 classes of WFRBS Commercial Mortgage Trust 2012-C9 commercial mortgage pass-through certificates. A detailed list of rating actions follows at the end of this press release. KEY RATING DRIVERS The affirmations are the result of the overall stable performance of the underlying pool since issuance. As of the August 2015 distribution date, the pool's aggregate principal balance has been reduced by 4.3% to $1.01 billion from $1.05 billion at