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 exchange-traded fund (ETF) is a basket of investments bundled together and sold as one unit. When you buy one share of an ETF, you own a small piece of everything inside it. If an ETF holds 500 different company stocks, buying one ETF share gives you exposure to all 500 without having to buy each stock separately.

ETFs trade during regular stock market hours on exchanges like the NYSE or NASDAQ, just like individual stocks do. You can buy and sell them through a brokerage account at any time the market is open. The price moves throughout the day based on what buyers and sellers are willing to pay, unlike mutual funds, which only price once per day after the market closes.

Key Takeaways

  • An ETF holds a collection of stocks, bonds, or other assets and trades as a single unit on a stock exchange during market hours.
  • You can buy and sell ETF shares anytime the market is open, and the price changes throughout the day like a stock price does.
  • Most ETFs track an index—a fixed list of companies or assets—so you know exactly what you own and the costs are usually low.
  • ETFs typically charge lower fees than actively managed mutual funds because they simply follow a preset list rather than paying managers to pick investments.

How an ETF differs from buying individual stocks

When you buy a single company's stock, you own a piece of that one company. If that company struggles, your investment loses value. With an ETF, your money is spread across many holdings, so one company's poor performance does not wipe out your investment.

Buying individual stocks also requires research and decision-making about which companies to pick. An ETF does that work for you by following a predetermined strategy—usually tracking an index like the S&P 500 or the Nasdaq-100. You do not have to decide which stocks belong in the fund; the index does.

Index-tracking ETFs versus actively managed ones

Most ETFs are index-tracking, meaning they simply hold the same stocks (or bonds) as a published index in the same proportions. An S&P 500 ETF, for example, holds the same 500 companies in the same weights as the S&P 500 index itself. Because the fund is not trying to beat the market—just match it—the annual fee is usually between 0.03% and 0.20% of your investment.

Some ETFs are actively managed, meaning a fund manager picks which stocks to hold and tries to outperform the index. These funds charge higher fees, typically 0.50% to 1.50% per year, because you are paying for the manager's time and research. Most actively managed ETFs do not beat their index-tracking counterparts over long periods, so many investors choose index-tracking ETFs to keep costs down.

What you actually own when you buy an ETF share

When you own one share of an ETF, you own a fractional piece of every holding inside it. If an ETF holds 100 stocks and you own one share, you own 1/100th of one share of each of those 100 companies (divided by the total number of ETF shares outstanding). You do not receive individual stock certificates or direct ownership documents; your brokerage account simply shows you own X shares of the ETF.

You receive dividends and capital gains distributions from the ETF just as you would from a mutual fund. If the companies inside the ETF pay dividends, the ETF collects them and passes them to you, usually quarterly. If the ETF sells holdings at a profit, it distributes those gains to shareholders as well.

Common types of ETFs and what they track

ETFs exist for nearly every investment category. Stock ETFs track indexes of U.S. companies (like the S&P 500), international companies, or specific sectors (technology, healthcare, energy). Bond ETFs hold government or corporate bonds. Commodity ETFs track oil, gold, or agricultural products. Sector ETFs focus on one industry. Factor ETFs target stocks with specific traits, like high dividend payments or low volatility.

There are also inverse ETFs and leveraged ETFs, which use more complex strategies to profit when markets fall or to amplify gains and losses. These are riskier and intended for experienced traders, not long-term investors.

Why the cost structure matters

The annual fee charged by an ETF is called the expense ratio. It is expressed as a percentage of your investment and is deducted automatically each year. A 0.10% expense ratio on a $10,000 investment costs $10 per year. A 1.00% ratio on the same $10,000 costs $100 per year.

Over decades, the difference compounds. If two ETFs return the same 7% per year but one charges 0.10% and the other charges 0.90%, the lower-cost fund will have significantly more money at the end. This is why many investors prioritize low-cost, index-tracking ETFs for the core of their portfolio.

How to buy and sell ETF shares

You buy and sell ETFs through a brokerage account—the same way you would buy individual stocks. You need a brokerage account with a firm like Fidelity, Vanguard, Charles Schwab, or a discount broker. Once your account is open and funded, you search for the ETF by its ticker symbol (a short code like SPY for the SPDR S&P 500 ETF), enter the number of shares you want, and place the order.

Your order executes during market hours at whatever price the ETF is trading at that moment. You can place a market order (buy at the current price immediately) or a limit order (buy only if the price drops to a certain level). Settlement typically occurs within two business days, meaning the shares appear in your account and the cash leaves your account on the second day after you trade.

Frequently Asked Questions

Can I lose money in an ETF?

Yes. If the stocks or bonds inside the ETF fall in value, your ETF share price falls too. However, because an ETF holds many holdings, you are less likely to lose everything than if you owned a single stock that went to zero. The diversification reduces but does not eliminate risk.

Do I pay taxes when I buy or sell an ETF?

You do not pay taxes on the purchase itself. You pay capital gains tax only when you sell the ETF for more than you paid for it. If you hold the ETF for more than one year before selling, you owe long-term capital gains tax, which is usually lower than short-term rates. Dividends and distributions are also taxable in the year you receive them.

What is the difference between an ETF and a mutual fund?

Both hold baskets of stocks or bonds, but ETFs trade during market hours like stocks, while mutual funds price once per day after the market closes. ETFs typically have lower fees and are more tax-efficient. Mutual funds are often actively managed, while most ETFs track an index. Both can work for long-term investing; the choice depends on your trading style and cost preferences.

Can I buy a fractional share of an ETF?

Many brokerages now allow fractional share purchases, meaning you can buy $50 worth of an ETF even if one full share costs $150. This makes ETFs more accessible to investors with smaller amounts of money to invest. Check your brokerage to see if they offer fractional shares.