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Mutual fund

Professionally managed investment fund

  • 15 min read
  • 5 chapters
  • 2 labs on Lably

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While exchange-traded funds are generally more popular with investors due to their tradability, lower fees, and tax advantages, mutual funds are popular in the U.S. among sponsors of 401(k) plans since open-end funds are priced only at the end of the trading day and fractional shares are easily purchased, making it easy for direct investment from payroll.

Mutual funds are often classified by their principal investments: stock fund, bond fund, money market fund, or hybrid fund. Funds may also be categorized as index funds, which are passively managed funds that track the performance of an index, such as a stock market index or bond market index, or actively managed funds, which seek to outperform stock market indices but generally charge higher fees. The types of securities in which a particular fund may invest in are set forth in the fund's prospectus, a legal document that describes the fund's investment objective, investment approach and permitted investments. The investment objective describes the type of income that the fund seeks.

The primary structures of mutual funds are open-end funds, whereby shares are purchased and sold directly from the issuers at the net asset value, and less commonly, closed-end funds, which are sold on securities exchanges and for which no more shares can be created.

Mutual funds have advantages and disadvantages compared to direct investing in individual securities. The advantages of mutual funds include economies of scale, diversification, market liquidity, and professional investment management.

A mutual fund is technically a mutual organization. It is organized by a management company, which does not own the fund but receives a management fee. Mutual funds are regulated by governmental bodies and are subject to securities laws. Fund managers are required to publish information including performance, comparisons of performance to benchmarks, fees charged, and securities held. A single mutual fund may have several share classes, for which larger investors pay lower fees.

Market size

At the end of 2023, open-end mutual fund assets worldwide were $69.0 trillion. The countries with the largest mutual fund industries are:

  1. United States: $38.8 trillion
  2. Luxembourg: $5.8 trillion
  3. Ireland: $4.5 trillion
  4. China: $3.4 trillion
  5. Germany: $2.7 trillion
  6. Australia: $2.6 trillion
  7. France: $2.5 trillion
  8. Japan: $2.2 trillion
  9. United Kingdom: $2.0 trillion
  10. Canada: $1.8 trillion

In the United States, at the end of 2024, 24% of household financial assets were invested in mutual funds. Almost half of U.S. mutual funds assets were held in individual retirement accounts, 401(k) plans, or other defined contribution retirement plans. Mutual funds accounted for 38% of the assets in individual retirement accounts and 60% of the assets in 401(k) plans.

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