Also found in: Medical.
Part B Prospectus
A supplement to a mutual fund's prospectus. It contains additional information on the fund, usually on its risks and operations. Mutual funds do not provide the part B prospectus to investors automatically, as many investors do not believe they need it to make an appropriate decision on whether to buy shares in the fund. However, regulations require that a mutual fund provide a copy of its part B prospectus free of charge upon request. It is also called a statement of additional information.