An ETF is a fund that holds many stocks, and you buy and sell it like a single stock

An exchange-traded fund (ETF) is a basket of investments — usually stocks, bonds, or a mix — bundled together and sold as one security. You buy a share of the ETF itself, not the individual holdings inside it. That share trades on a stock exchange during market hours, just like buying shares of Apple or Microsoft. The price moves throughout the day based on what investors are willing to pay.

The key difference from owning individual stocks: one ETF share gives you exposure to dozens, hundreds, or even thousands of companies at once. An ETF tracking the S&P 500, for example, holds pieces of 500 large U.S. companies. You get that diversification with a single purchase and a single ticker symbol.

Key Takeaways

  • An ETF is a collection of stocks (or bonds, or both) packaged as a single security that trades like a stock during market hours.
  • You own a share of the fund itself, not the individual companies inside it, but you benefit from owning pieces of all of them.
  • ETFs are cheaper to buy and hold than picking individual stocks because they charge lower fees and require less research.
  • The price of an ETF share changes throughout the trading day based on supply and demand, unlike mutual funds which price once per day.
  • Most ETFs are passive, meaning they track an index like the S&P 500 rather than having a manager trying to beat the market.

How an ETF differs from owning individual stocks

When you buy a single stock, you own a piece of one company. You profit if that company does well and lose money if it struggles. When you buy an ETF, you own a tiny slice of every holding in that fund. If one company in the ETF performs poorly, it barely dents your return because you own pieces of hundreds of others.

This matters because individual stocks are riskier. A single bad earnings report, management change, or lawsuit can tank a stock's price. An ETF smooths out that volatility. You are betting on the overall market or a specific sector, not on one company's success.

Why ETFs charge lower fees than mutual funds

Most ETFs are passive funds, meaning they simply track an index — a pre-set list of stocks like the S&P 500 or the Nasdaq 100. A computer does the work of holding those exact stocks in those exact proportions. There is no fund manager making buy-and-sell decisions, so there is no expensive team to pay.

Mutual funds, by contrast, often employ active managers who research companies and try to beat the market. That research and trading costs money, and those costs get passed to you as fees. ETF expense ratios — the annual percentage you pay to hold the fund — often run 0.03% to 0.20% per year. A comparable active mutual fund might charge 0.50% to 1.50% or more. Over decades, that difference compounds into thousands of dollars.

The difference between ETF prices and net asset value

An ETF's net asset value (NAV) is the true worth of all the stocks inside it, divided by the number of shares outstanding. It is calculated once per day after the market closes. But the ETF's actual trading price — what you pay to buy or sell a share — can differ slightly from the NAV during the trading day.

This happens because ETFs trade on an exchange like stocks do. If more people want to buy than sell, the price rises above NAV. If more people want to sell, it falls below. Usually the gap is tiny — a few cents on a $100 share — because traders called authorized participants step in to profit from the difference, which pushes the price back toward NAV. But the gap can widen during market stress or for thinly traded ETFs, so it is worth checking both the NAV and the current bid-ask spread before you buy.

Active versus passive ETFs

Most ETFs are passive and track an index. You know exactly what you own: if the fund tracks the S&P 500, it holds the S&P 500 stocks in the same weights. The fund's performance will match the index, minus a small fee.

A smaller number of ETFs are actively managed. A fund manager picks the holdings, trying to outperform a benchmark. These ETFs charge higher fees because you are paying for the manager's research and decisions. Some beat their benchmark; many do not. For most new investors, passive ETFs are the simpler and cheaper choice.

What happens when you own an ETF and it pays dividends

Many of the stocks inside an ETF pay dividends — cash payments to shareholders. The ETF collects those dividends and passes them to you. You can choose to reinvest the dividend (buy more shares of the ETF automatically) or take it as cash. Your brokerage account will show you the dividend payment and let you set your preference.

Some ETFs are designed to hold high-dividend stocks, so they pay out more frequently and in larger amounts. Others hold growth stocks that rarely pay dividends. Check the fund's fact sheet to see its dividend yield — the annual payout as a percentage of the share price — before you buy if income matters to you.

Tax efficiency and ETF structure

ETFs have a structural advantage over mutual funds for taxes. When a mutual fund manager sells a stock at a profit, that capital gain gets passed to all shareholders, and you owe tax on it even if you did not sell your shares. ETFs rarely trigger this problem because of the way they are created and redeemed. Authorized participants can exchange shares of the ETF for the underlying stocks without triggering taxable events for other shareholders.

This does not mean ETFs are tax-free. You still owe capital gains tax when you sell your ETF shares at a profit, and you owe income tax on dividends. But you avoid the surprise tax bill from the fund manager's trading activity. For investors in taxable accounts (not retirement accounts), this is a real advantage.

Frequently Asked Questions

Can I lose money in an ETF?

Yes. If the stocks inside the ETF fall in value, your ETF share price falls too. You can lose your entire investment if the market crashes severely. ETFs reduce the risk of any single company tanking your portfolio, but they do not eliminate market risk. Diversification lowers volatility; it does not prevent losses.

Do I need a lot of money to start with an ETF?

No. You can buy a single share of most ETFs for anywhere from $20 to $200, depending on the fund. Some brokerages also offer fractional shares, so you can invest smaller amounts. This makes ETFs more accessible than buying individual stocks if you have limited capital.

What is the difference between an ETF and an index fund?

An index fund is a mutual fund that tracks an index. An ETF also tracks an index (usually). The main difference is how they trade: ETFs trade throughout the day like stocks, while index mutual funds price once per day. ETFs typically have lower fees and better tax efficiency. Both are passive, low-cost ways to invest in a broad market.

Can I buy and sell an ETF anytime during the trading day?

Yes. ETFs trade during stock market hours (9:30 a.m. to 4 p.m. Eastern time on weekdays). You can place a buy or sell order anytime the market is open and see the price update in real time. Mutual funds, by contrast, only price and trade once per day after the market closes.

What does "expense ratio" mean for an ETF?

The expense ratio is the annual fee the fund charges as a percentage of your investment. A 0.10% expense ratio means you pay $10 per year for every $10,000 invested. This fee is deducted automatically from the fund's returns, so you do not write a check. Lower expense ratios are better, especially for passive ETFs where the difference between funds is small.