In U.S. financial law, a unit investment trust (UIT) is an exchange-traded mutual fund offering a fixed (unmanaged) portfolio of securities having a definite life. Unlike open-end and closed-end investment companies, a UIT has no board of directors. A UIT is registered with the Securities and Exchange Commission under the Investment Company Act of 1940 and is classified as an investment company.
UITs are assembled by a sponsor and sold through brokerage firms to investors.