Louisville, Colo.-based Zayo Group LLC has announced a $150 million add-on to its term loan B. The 'B' issue rating and '4' recovery rating on the loan remain unchanged following the add-on. NEW YORK (Standard&Poor's) Nov. 21, 2013--Standard&Poor's Ratings Services ratings today said its 'B' issue rating and '4' recovery rating on Louisville, Colo.-based Zayo Group LLC's term loan remain unchanged following the announced $150 million add-on to the loan. The '4' recovery rating indicates our expectation for average (30%-50%) recovery of principal in the event of default. Standard&Poor's has reviewed all its ratings on Zayo Group LLC, which it labeled as "under criteria observation" (UCO) after the publishing of its revised corporate criteria