What Is a Mutual Fund?
A mutual fund is an investment vehicle that gathers money from many investors and uses it to buy a collection of stocks, bonds, or other securities. Each investor owns shares of the fund rather than the underlying holdings, and the fund's portfolio is typically overseen by a professional portfolio manager or management team. Because the money is pooled, an investor with a modest amount can gain exposure to dozens or even hundreds of different securities.
How Mutual Funds Work
Investors buy and sell fund shares directly with the fund company or through a brokerage. Unlike a stock, a mutual fund share is not traded between investors on an exchange. Instead, it is bought from or sold back to the fund at its net asset value (NAV), which is calculated once per day after the market closes. The fund's NAV equals the total market value of its holdings, minus liabilities, divided by the number of shares outstanding. Because shares are created and redeemed as investors buy and sell, the number of shares changes over time.
Mutual funds come in several styles. Some are actively managed, with a manager choosing investments in an attempt to beat a benchmark. Others are passively managed and aim to track an index. Funds may focus on stocks, bonds, a mix of both, or specific sectors and regions.
Advantages and Disadvantages
The main appeal of a mutual fund is diversification. A single share can spread risk across many holdings, and professional management can handle research and rebalancing. Funds also offer convenience, since one purchase provides exposure to a broad set of securities.
There are drawbacks to consider. Funds charge an expense ratio that reduces returns over time, and some carry sales charges or other fees. Because trades happen at the end of the day, investors cannot respond to intraday price moves. Funds may also distribute capital gains to shareholders, which can create a tax bill even for investors who did not sell their shares. Past performance does not guarantee future results.
Updated October 15, 2026. For general education only; not financial, tax or legal advice.