Investment types

Mutual Fund

How an open-end mutual fund pools investor money, prices shares at NAV, distributes returns, and charges costs.

Definition

A mutual fund is an open-end investment company that pools money from investors in a managed portfolio; each share represents a proportional interest in that portfolio.

A mutual fund pools investor money into holdings and processes orders at NAV. — Several investors feed a pooled mutual fund that owns holdings, with orders priced at the next calculated net asset value. Credit: Original Aconsus explanatory diagram

Pooling and management

A fund follows the objective and policies in its prospectus. It may own stocks, bonds, money-market instruments, or other assets. Professional management and broad holdings can be convenient, but a fund is diversified only to the extent its actual portfolio is diversified.

Returns flow from the holdings after expenses. Interest and dividends may be distributed as income; realized gains may create capital-gain distributions; and changing portfolio values change net asset value. Reinvesting a distribution buys more shares but does not make the distribution free or necessarily avoid tax.

Once-daily transaction price

An open-end mutual fund generally issues and redeems shares with the fund at the next calculated net asset value, commonly after the market closes. NAV equals assets minus liabilities divided by shares outstanding. Unlike an ETF, a conventional mutual fund is not continuously quoted and traded between investors intraday.

The eventual NAV is unknown when an investor places an order before the pricing cutoff. Sales loads, redemption fees, account charges, and ongoing expenses may also apply, depending on the share class and platform.

Read beyond past performance

Mutual funds can be actively managed or can operate as index funds. The structure does not reveal strategy, quality, or cost. Compare objective, benchmark, holdings, turnover, expense ratio, loads, risk disclosures, and manager approach.

U.S. mutual funds described by the sources are SEC-registered products and are not bank deposits insured against market loss. Other jurisdictions use different fund forms and rules; similarly named products may price or distribute differently.

Hypothetical example

A mutual fund has $102 million of assets, $2 million of liabilities, and 5 million shares. Its NAV is ($102m − $2m) ÷ 5m = $20. An investor’s order receives the next calculated NAV, not necessarily $20. If a 3% sales load applies, the economic cost must be included when comparing alternatives.

Limitations to keep in mind

Holdings can decline, and registration or professional management does not insure principal.
Expense ratios, loads, turnover costs, and taxes reduce investor returns.
Concentrated strategies and redemption pressure can create market or liquidity risk.

Sources and further reading

Mutual Funds — U.S. Securities and Exchange Commission — Investor.gov
Mutual Funds — FINRA

Published Sep 19, 2026; Reviewed Sep 19, 2026. Automated editorial source comparison; no external certification Claims compared with cited sources: 1

The broad term “fund” can include closed-end funds and other structures; this article specifically defines the conventional U.S. open-end mutual fund.