An ETF is a fund that holds many stocks (or bonds, or other assets) and trades on a stock exchange like a single stock

An ETF, or exchange-traded fund, is a basket of investments bundled together and sold as one unit. You buy and sell it the same way you buy and sell individual company stock — through a brokerage account, during market hours, at a price that changes throughout the day. But instead of owning one company, you own a small piece of dozens, hundreds, or sometimes thousands of holdings inside that fund.

The key difference from a mutual fund is the trading. A mutual fund's price is set once per day after the market closes. An ETF's price updates every few seconds while the market is open, just like Apple or Microsoft stock does. That makes ETFs faster to buy and sell, and usually cheaper to own because they have lower fees.

Most ETFs track an index — a predetermined list of stocks. The S&P 500 ETF, for example, holds the same 500 large U.S. companies that make up the S&P 500 index. When you buy that ETF, you're betting on those 500 companies as a group, not on any single one.

Key Takeaways

  • An ETF trades like a stock but holds a collection of many investments inside it, so you own pieces of dozens or hundreds of companies with one purchase.
  • ETF prices change throughout the trading day, unlike mutual funds, which are priced once at the end of each day.
  • Most ETFs track an index like the S&P 500, meaning they automatically hold the same stocks in the same proportions as that index.
  • ETFs typically charge lower fees than actively managed mutual funds because they simply copy an index rather than paying a manager to pick stocks.
  • You can buy an ETF through any brokerage account the same way you buy individual stock, and you can sell it anytime the market is open.

How an ETF differs from owning individual stocks

When you own individual stocks, you own a piece of one company. If that company struggles, your investment can drop sharply. With an ETF, your money is spread across many companies, so one company's bad quarter affects you much less. This is called diversification, and it reduces the risk that any single bad decision or event will wipe out your investment.

Individual stocks also require you to research and monitor each company. An ETF does that work for you — the fund manager (or the index itself) decides which stocks to hold and in what amounts. You make one decision: buy the ETF. After that, the fund rebalances itself automatically.

The trade-off is that you give up the chance to beat the market by picking the right stocks. If you own an S&P 500 ETF, you'll match the performance of the S&P 500, minus a small fee. You won't outperform it, but you also won't underperform it by much.

What types of ETFs exist

Index ETFs are the most common. They track a specific index — the S&P 500, the Nasdaq 100, the total U.S. stock market, international stocks, or bonds. You know exactly what you own because the index is public and doesn't change often.

Actively managed ETFs have a manager who picks stocks or bonds to try to beat an index. They cost more in fees because someone is doing the picking, but some investors believe the manager's skill is worth the extra cost.

Sector ETFs focus on one industry — technology, healthcare, energy, or finance. International ETFs hold stocks from other countries. Bond ETFs hold bonds instead of stocks. Dividend ETFs focus on companies that pay dividends. There are hundreds of ETFs, each designed for a different investing goal or belief about where the market is headed.

Why investors choose ETFs over mutual funds

ETFs and mutual funds both let you own many investments at once, but ETFs have practical advantages. Because ETF prices update all day, you can sell in a panic if the market crashes — you're not locked into a price set hours later. Mutual funds are priced only once per day, after the market closes.

ETF fees are usually lower. An index mutual fund might charge 0.5% per year; an index ETF might charge 0.03%. Over decades, that difference compounds into thousands of dollars. Actively managed mutual funds often charge 1% or more, while even actively managed ETFs rarely exceed 0.75%.

ETFs are also more tax-efficient. The way they're structured, they rarely distribute capital gains to shareholders, so you pay less in taxes each year. Mutual funds distribute gains more often, which means a bigger tax bill for you.

How to buy an ETF

You buy an ETF through a brokerage account — the same account you'd use to buy individual stocks. Open an account with a broker like Fidelity, Vanguard, Charles Schwab, or any other firm that offers stock trading. Fund the account with cash. Then search for the ETF by its ticker symbol (SPY for one S&P 500 ETF, for example) and place an order to buy shares, just as you would for a stock.

The order executes during market hours (9:30 a.m. to 4 p.m. Eastern time on weekdays). You'll own the shares immediately and can sell them anytime the market is open. There's no waiting period, no special paperwork, and no difference in the buying process from buying individual stock.

Most brokerages now charge zero commission to buy or sell ETFs, so you pay only the price of the ETF itself, not a fee to the broker. Some brokerages offer a curated list of commission-free ETFs, though you can usually buy any ETF regardless of which broker you use.

The costs of owning an ETF

Every ETF charges an annual fee called an expense ratio, expressed as a percentage of what you own. An ETF with a 0.05% expense ratio costs you $5 per year for every $10,000 you invest. That fee is deducted automatically from the fund's value; you don't write a check.

Index ETFs typically charge between 0.03% and 0.20% per year. Actively managed ETFs and specialized ETFs (like those focused on a single sector or a specific strategy) often charge 0.50% to 1.00% or higher. Over time, lower fees matter enormously. A 0.50% difference in fees can cost you tens of thousands of dollars over a 30-year investment period.

You may also pay a small bid-ask spread when you buy or sell — the difference between what buyers are willing to pay and what sellers are asking. For popular ETFs, this spread is tiny, often just a few cents per share. For obscure ETFs with few buyers and sellers, the spread can be larger.

ETFs as part of a long-term strategy

Many investors use ETFs as the core of a long-term portfolio. A common approach is to buy a total U.S. stock market ETF, an international stock ETF, and a bond ETF, then hold them for decades while adding money regularly. This strategy requires almost no decisions after the initial setup, and the low fees mean more of your money stays invested and grows.

ETFs are also useful for tactical moves — if you think technology stocks will outperform, you can buy a technology sector ETF without picking individual tech companies. Or if you want to reduce risk, you can shift money from stock ETFs to bond ETFs without selling individual positions.

Because ETFs trade like stocks, they're also useful for people who want to time their purchases or sales. If you believe the market is about to drop, you can sell an ETF immediately at the current price, rather than waiting for a mutual fund to be priced at day's end.

Frequently Asked Questions

Do I pay taxes on ETF gains while I hold them?

Not usually. You pay taxes only when you sell the ETF for a profit (a capital gain) or when the ETF distributes dividends to you. Because ETFs are structured to minimize distributions, you typically owe less in taxes each year than you would with a mutual fund holding the same stocks. You do owe taxes when you eventually sell.

Can I lose money in an ETF?

Yes. If the stocks or bonds inside the ETF drop in value, your ETF drops too. Diversification reduces risk but doesn't eliminate it. A stock market crash will hurt an S&P 500 ETF. A bond ETF can lose value if interest rates rise. The longer you hold, the more time you have to recover from downturns.

What's the difference between an ETF and a stock?

A stock represents ownership in one company. An ETF represents ownership in many companies (or bonds, or other assets). Stocks are riskier but can outperform if you pick the right company. ETFs are safer because your money is spread across many holdings, but you won't beat the market.

Should I buy an ETF or individual stocks?

If you don't have time to research companies or you want lower risk, ETFs are simpler and safer. If you enjoy researching and believe you can pick winners, individual stocks offer higher potential returns — but also higher risk. Many investors do both: use ETFs as a stable core and buy individual stocks with a smaller portion of their money.

Can I hold an ETF in a retirement account?

Yes. You can buy ETFs in an IRA, 401(k), or any other retirement account. In fact, ETFs are popular in retirement accounts because their low fees mean more of your money compounds over time. Many people build their entire retirement portfolio using just a few low-cost index ETFs.