The NASD/Bloomberg Active U.S. Corporate Bond Indexes are comprised of the "active" (most frequently traded) fixed coupon bonds represented by NASD TRACE, NASD's transaction reporting facility that disseminates all over-the-counter secondary market transactions in these public bonds. Indexes are updated after 5:30PM ET each business day. The indexes are rebalanced on a monthly basis.

Total Return (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.

Price (Index) is the weighted average Index price of all bonds in the index. Please see below for details.

Yield (Index) is the weighted average Index yield of all bonds in the index. Please see below for details.

Change — Calculated as today's value less yesterday's value.

Volume — 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.