What is a Mutual Fund?

A mutual fund is a form of collective investment that pools money from many investors and invests the money in stocks, bonds, short-term money-market instruments, and/or other securities. [1] Legally known (in the US) as an "open-end company", a mutual fund is one of three basic types of investment companies available in the US. [2]

The portfolio manager trades the fund's underlying securities, realizing a gain or loss, and collects the dividend or interest income. The investment proceeds are then passed along to the individual investors. The securities held by a fund may gain or lose value. There are more mutual funds than there are individual stocks.

Mutual funds can invest in many different kinds of securities. The most common are cash, stock, and bonds, but there are hundreds of sub-categories. Stock funds, for instance, can invest primarily in the shares of a particular industry, such as technology or utilities. These are known as sector funds. Bond funds can vary according to risk (high yield or junk bonds, investment-grade corporate bonds), type of issuers (government agencies, corporations, or municipalities), or maturity of the bonds (short or long term). Both stock and bond funds can invest in primarily US securities (domestic funds), both US and foreign securities (global funds), or primarily foreign securities (international funds).

By law, mutual funds cannot invest in commodities and their derivatives or in real estate. However, there do exist real estate investment trusts, or REITs, which invest solely in real estate or mortgages, and mutual funds are allowed to hold shares in REITs. A mutual fund may restrict itself in other ways. These restrictions, permissions, and policies are found in the prospectus, which every open-end mutual fund must make available to a potential investor before accepting his or her money.

Most mutual funds' investment portfolios are continually adjusted under the supervision of a professional manager, who forecasts the future performance of investments appropriate for the fund and chooses the ones which he or she believes will most closely match the fund's stated investment objective. A mutual fund is administered through a parent management company, which may hire or fire fund managers.

Mutual funds are subject to a special set of regulatory, accounting, and tax rules. Unlike most other types of business entities, they are not taxed on their income as long as they distribute substantially all of it to their shareholders. Also, the type of income they earn is often unchanged as it passes through to the shareholders. Mutual fund distributions of tax-free municipal bond income are also tax-free to the shareholder. Taxable distributions can either be ordinary income or capital gains, depending on how the fund earned it.