The Market Aggregate statistics provides an end-of-day recap of secondary corporate bond market activity in publicly traded TRACE eligible securities. The aggregate statistics is updated approximately 23:00 EST daily, Monday through Friday, except holidays. The 52 Week High and 52 Week Low values include all Total Issues Trades, except those issues whose issue date is within the prior five business days. High and Low values are determined from the Last Sale. Dollar Volume per security is calculated as quantity of bonds times par value. This information is aggregated for the universe and rounded to the nearest million. Values represent Million USD. Trades are included as: Customer Buys and sells, and Inter-Dealer sells. Tickers with '4' represent data for 144A issues.