Sources and further reading
Useful primary sources for checking the underlying definitions and investor guidance:
Unit Investment Trust (UIT)
Last reviewed: September 2, 2026
A unit investment trust, or UIT, pools investor money into a generally fixed portfolio of stocks, bonds or other securities. Unlike a traditional mutual fund, a UIT normally has a set portfolio and a specified termination date.
Reviewed September 2026
How a unit investment trust works
A sponsor selects a portfolio and offers a fixed number of units to investors. The portfolio is usually not actively traded during the life of the trust. Investors can typically redeem units at a value based on the trust’s net assets, and some sponsors also maintain a secondary market.
UIT vs. mutual fund
Both pool money from many investors, but they are structured differently. A mutual fund is usually open-ended and actively or passively managed on an ongoing basis. A UIT normally starts with a fixed portfolio, does little or no trading, and ends on a stated date.
Simple example
Suppose a UIT is created with a portfolio of 20 bonds and is scheduled to terminate in five years. Investors buy units that represent an interest in that portfolio. Interest and principal received by the trust are distributed according to the trust’s terms, and the remaining assets are sold or distributed when the UIT ends.
What to check before investing
Look at what the trust owns, when it terminates, sales charges, ongoing expenses, redemption terms and the risks of the underlying securities. A fixed portfolio can make holdings easier to understand, but it does not make the investment risk-free.
Related concepts
Primary reference
For the formal definition and current regulatory context, see Investor.gov: Unit Investment Trusts (UITs).