Treasury Direct business definition

A U.S. Treasury book-entry security system that allows investors to purchase and maintain U.S. Treasury securities, including bills, notes, bonds, TIPS, and U.S. savings bonds. The system is generally designed for investors who plan to hold securities until maturity, although securities held in an account can be sold at current market prices through brokers or many financial institutions. Treasury securities that have already been issued can only be purchased through brokers or dealers in the secondary market.