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. Total par value traded for all bonds in the index in millions of U.S. dollars - this is the total volume reported to TRACE and is not constrained by Disseminated Volume caps. FINRA - Bloomberg Active US Corporate Bond Indices are comprised of the active (most frequently traded) fixed coupon bonds represented by FINRA TRACE, FINRA Currency '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 NBBHTR MEMB for constituent information. Index launch date: October 17, 2005.