In the March 2012 rebalancing a significant number of bonds that were eligible for the index but were being excluded because of a technical error were added to the index. Measures the total amount earned by owning a security over the time period. It incorporates the accrued interest on the bond during ownership, coupons paid out on the bond, and rise and fall of the bond's price. It is the most complete measure of the amount of money made on holding fixed income issues in the index. FINRA - Bloomberg Active US Corporate Bond Indices are comprised of the active (most frequently traded) fixed coupon bonds represented by FINRA TRACE, FINRA's transaction reporting facility that disseminates all over-the-counter secondary market transactions in these public bonds. The indices are rebalanced on a monthly basis. Type NBBITR <index> MEMB <GO> for constituent information. Index launch date: October 17, 2005.