Mutual Fund

April 1, 2026 Investments

Pooled investment vehicle that buys a managed portfolio and usually prices investor transactions once per day at net asset value.

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A mutual fund is a pooled investment vehicle that collects money from many investors and invests it according to a stated strategy.

Instead of buying every underlying security directly, an investor buys shares of the fund. Those shares represent an interest in the fund’s portfolio and the income or gains the portfolio may generate.

Key Takeaways

Mutual funds pool investor money into a professionally managed portfolio.
Traditional open-end mutual funds usually buy and redeem shares once per day at net asset value.
Mutual funds can be active or passive, stock, bond, money market, balanced, or specialized.
Costs can include expense ratios, sales loads, redemption fees, taxes, and transaction-related costs.
Diversification reduces single-security exposure but does not remove market, credit, interest-rate, or strategy risk.

How a Mutual Fund Works

A mutual fund owns a portfolio of securities such as stocks, bonds, money-market instruments, or other assets. The fund’s investment adviser manages the portfolio according to the fund documents.

For a traditional open-end mutual fund, investors typically buy or redeem shares at the NAV calculated after the market close:

\text{NAV per Share} = \frac{\text{Fund Assets} - \text{Fund Liabilities}}{\text{Shares Outstanding}}

That structure is different from an ETF, which trades intraday on an exchange at a market price.

Why Investors Use Mutual Funds

Investors often use mutual funds for:

diversified exposure in one purchase
professional portfolio management
automatic investment and reinvestment plans
retirement-plan investment menus
access to active, index, bond, money-market, or balanced strategies

Mutual funds can be simple long-term building blocks, but the fund label alone is not enough. The strategy, fees, holdings, and tax treatment still matter.

Mutual Fund vs. ETF

Feature	Mutual fund	ETF
Trading	Usually once per day at NAV.	Intraday on an exchange at market prices.
Common access	Fund company, retirement plan, adviser, or brokerage platform.	Brokerage account during market hours.
Automatic investing	Often straightforward.	Possible on some platforms, but structure varies.
Price behavior	Investor transactions usually occur at daily NAV.	Market price can differ from NAV.
Best fit	Long-term allocation, retirement menus, active management, automatic contributions.	Intraday trading, low-cost index access, taxable-account flexibility.

Neither structure is automatically superior. Compare the actual fund, account type, costs, taxes, and investor behavior.

Common Mutual Fund Types

Type	Typical purpose	Main caution
Index mutual fund	Track a benchmark.	Tracking, expenses, and tax treatment still matter.
Active mutual fund	Try to outperform a benchmark through manager selection.	Higher fees and manager risk may matter.
Bond mutual fund	Hold fixed-income securities.	Interest-rate, credit, and liquidity risk remain.
Money market fund	Seek stable, short-term cash management.	Not identical to a bank deposit or insured savings account.
Balanced fund	Mix stocks and bonds in one fund.	Allocation may not match the investor’s full portfolio target.

Common Mistakes

Assuming mutual funds are always actively managed.
Comparing funds by past performance without checking fees, risk, and benchmark fit.
Treating diversification as protection from all losses.
Ignoring tax distributions in taxable accounts.
Confusing fund NAV with an intraday market quote.

How to Evaluate a Mutual Fund

Before using a mutual fund in a portfolio, review:

investment objective and strategy
holdings and asset-class exposure
benchmark and performance period
expense ratio and any sales charges
portfolio turnover and tax distributions
redemption terms and liquidity
whether the fund fits the investor’s asset allocation

This page is general financial education, not personalized investment, tax, or legal advice.

Official Resources

Investor.gov: Mutual Funds explains mutual-fund structure and ownership.
Investor.gov: Characteristics of Mutual Funds and ETFs compares mutual funds and ETFs.
SEC guide to Mutual Funds and ETFs provides investor education on fund terms, costs, and risks.

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FAQs

Are mutual funds only for beginners?

No. Mutual funds are used by individual investors, retirement plans, advisers, and institutions because they package strategy, diversification, and administration efficiently.

Can a mutual fund be passive?

Yes. Many index funds are mutual funds that track a benchmark instead of trying to outperform it.

Why might an investor prefer a mutual fund over an ETF?

Some investors prefer automatic investing, retirement-plan availability, active management access, or once-daily NAV pricing.

Net Asset Value: Standard pricing basis for many mutual fund transactions.
Exchange-Traded Fund: Related pooled vehicle that trades intraday.
Index Fund: Common passive mutual fund or ETF strategy.
Expense Ratio: Annual fund operating cost that reduces returns.
Money Market Fund: Mutual fund type used for short-term cash management.
Diversification: One of the main reasons investors use pooled funds.

Money Market Fund

Mutual Funds vs. ETFs