An ETF is a fund that holds many stocks or bonds and trades on a stock exchange like a single stock

An ETF stands for exchange-traded fund. It is a basket of investments — usually stocks, sometimes bonds, sometimes a mix — bundled together and sold as one unit. You buy and sell ETF shares through a brokerage account the same way you buy individual stock shares. The price changes throughout the trading day based on what other investors are willing to pay.

The key difference between an ETF and buying stocks one at a time is diversification built in. When you buy one ETF share, you own a tiny piece of dozens or hundreds of companies at once. If one company's stock drops, the others may hold steady or rise, so your total investment is less likely to swing wildly.

Key Takeaways

  • An ETF holds many stocks or bonds in one fund, and you trade it like a single stock through your brokerage account.
  • ETFs cost less to buy than purchasing each stock separately, and they spread your money across many companies automatically.
  • Some ETFs track a market index like the S&P 500; others are actively managed by a fund manager who picks the holdings.
  • ETF fees vary widely, so comparing the expense ratio — the yearly cost as a percentage — matters when choosing between similar funds.

How ETF shares are created and priced

ETF shares are created by authorized participants — usually large financial firms — who bundle the underlying stocks and sell shares to the public. The price of an ETF share reflects the total value of all the stocks inside it, divided by the number of shares outstanding. If the ETF holds 100 stocks worth $10,000 total and there are 1,000 shares, each share costs about $10.

Throughout the trading day, the price moves as investors buy and sell. Unlike a mutual fund, which is priced once at the end of each day, an ETF price updates constantly during market hours. This means you can sell an ETF share at 10 a.m. or 3 p.m. and get the price at that moment, not a price set hours later.

Index-tracking ETFs versus actively managed ETFs

Most ETFs are index funds. They hold the same stocks in the same proportions as a published market index. An S&P 500 ETF, for example, holds all 500 companies in that index in the same weights the index uses. The fund manager does not pick winners or losers — the holdings change only when the index itself changes. These funds are cheap to run, so their yearly fees are usually very low, often under 0.1 percent.

Some ETFs are actively managed. A fund manager decides which stocks to buy and sell, trying to beat the market or achieve a specific goal. These funds cost more to operate because the manager is making constant decisions. Yearly fees often run 0.5 to 1 percent or higher. Research shows that most active managers do not beat their index-tracking counterparts over long periods, which is why index ETFs are popular with many investors.

What you pay to own an ETF

When you buy an ETF through a brokerage, you pay the share price plus any commission your broker charges. Many brokers now charge zero commission on ETF trades, so you pay only the share price. That price already reflects the fund's internal costs.

The main ongoing cost is the expense ratio, a yearly fee expressed as a percentage of your investment. A 0.05 percent expense ratio on a $10,000 investment costs $5 per year. A 1 percent ratio on the same $10,000 costs $100 per year. The fund company deducts this automatically, so you do not see a bill — it simply reduces your returns. Over decades, even small differences in expense ratios add up significantly.

ETFs versus individual stocks and mutual funds

Buying an individual stock means you own one company. If that company struggles, your investment can drop sharply. An ETF spreads the risk across many companies, so one bad performer hurts less. The trade-off is that you also do not capture the full upside if one stock soars — your gain is diluted by the other holdings.

Mutual funds are similar to ETFs in that they hold many investments in one fund. The main differences are timing and cost. Mutual funds are priced once per day after markets close, while ETFs trade throughout the day. Mutual funds often have higher expense ratios and sometimes charge a sales fee when you buy or sell. ETFs typically cost less and trade without sales fees at most brokers.

Common types of ETFs and what they track

ETFs exist for nearly every market segment and investment style. Stock ETFs hold shares of companies — some track the entire U.S. market, others focus on specific industries like technology or healthcare, and still others target international markets. Bond ETFs hold government or corporate debt and pay interest. Sector ETFs concentrate on one industry. Dividend ETFs hold stocks known for paying regular dividends to shareholders.

There are also commodity ETFs that track gold, oil, or agricultural products, and real estate ETFs that hold property-owning companies. Some ETFs use leverage or short-selling strategies to bet against the market or amplify gains and losses. Most beginning investors start with broad stock ETFs that track major indexes because they offer low cost and wide diversification.

How to buy and sell ETF shares

To buy an ETF, you need a brokerage account — an account with a company like Fidelity, Charles Schwab, Vanguard, or a similar firm. You fund the account with cash, search for the ETF by its ticker symbol (a short code like SPY or VOO), and place a buy order. The order executes during market hours, and the shares appear in your account. You can hold them for years or sell them whenever you want.

Selling works the same way. You log into your account, select the ETF, and place a sell order. The shares are converted to cash, which sits in your account and can be withdrawn or used to buy other investments. There are no restrictions on how often you buy or sell, though some brokers may charge fees for frequent trading in certain account types.

Frequently Asked Questions

Do I need a lot of money to start buying ETFs?

No. Most brokers let you buy a single share of any ETF, and shares can cost anywhere from $20 to $400 depending on the fund. You can start with as little as $100 or $500. Some brokers also offer fractional shares, meaning you can invest any dollar amount, even $10, and own a piece of an ETF share.

Are ETFs safer than individual stocks?

ETFs reduce the risk that one bad investment will hurt you badly, because you own many companies at once. However, they are not risk-free. If the entire market drops, most stock ETFs drop too. Bond ETFs carry interest rate risk. The safety comes from spreading risk, not eliminating it.

Can I lose money in an ETF?

Yes. If the stocks or bonds inside the ETF fall in value, your ETF shares fall too. You can sell at a loss if you need cash before the market recovers. However, if you hold the ETF long-term, historical data shows that broad market ETFs have recovered from past downturns.

What is the difference between an ETF and a stock index?

An index is a list of stocks and their weights — it is not something you can buy directly. An ETF is a fund that copies an index and sells shares you can own. The S&P 500 is an index; an S&P 500 ETF is a fund that holds those 500 stocks and lets you invest in them as one unit.

Do ETFs pay dividends?

Many do. If the stocks inside an ETF pay dividends, the fund collects that money and distributes it to shareholders, usually once or four times per year. You can take the dividend as cash or reinvest it to buy more ETF shares. The dividend amount varies depending on which stocks are in the fund.