An ETF is a basket of stocks or bonds you can buy and sell like a single stock

An exchange-traded fund (ETF) is a collection of investments bundled together and sold as one package. Instead of buying Apple, Microsoft, and Tesla separately, you buy one ETF that owns pieces of all three — plus dozens or hundreds of other companies. The fund trades on a stock exchange during market hours, so you can buy or sell shares whenever the market is open, just like you would with individual stocks.

ETFs hold real assets inside them. A stock ETF owns actual shares of companies. A bond ETF owns actual bonds. A commodity ETF might own gold or oil futures. When you own a share of an ETF, you own a proportional slice of everything inside it. If the ETF holds 500 stocks and you own 1% of the fund, you own a tiny piece of all 500 companies.

The fund is managed by a company — Vanguard, BlackRock, Invesco, and State Street are the largest — but many ETFs are passive, meaning they straightforward track an index like the S&P 500 rather than having a manager actively picking which stocks to buy. This matters because passive ETFs typically charge lower fees than actively managed funds.

Key Takeaways

  • An ETF is a collection of stocks, bonds, or other investments packaged together and traded as a single security on a stock exchange.
  • You can buy and sell ETF shares during market hours at a price that changes throughout the day, unlike mutual funds which price once per day.
  • Most ETFs track an index passively, meaning they aim to match the performance of something like the S&P 500 rather than beat it.
  • ETF fees are typically lower than mutual fund fees because most are passively managed, and you pay them annually as a percentage of your investment.
  • ETFs let you own a diversified portfolio with a single purchase, spreading your money across many companies or bonds at once.

How ETF prices work during the trading day

An ETF's price changes constantly while the market is open, just like a stock price. If you buy an ETF at 9:35 a.m., you pay one price. If you buy the same ETF at 2:00 p.m., you may pay a different price. This real-time pricing is one key difference from mutual funds, which price only once per day after the market closes.

The price of an ETF share reflects what the underlying holdings are worth. If an ETF owns 100 stocks and those stocks go up in value, the ETF price goes up. If they fall, so does the ETF price. The fund company does not set the price — the market does, based on supply and demand from buyers and sellers.

You can place different types of orders when you buy or sell an ETF. A market order executes when ready at whatever the current price is. A limit order lets you set a maximum price you will pay (when buying) or a minimum price you will accept (when selling). Most people use market orders for ETFs because they trade frequently and the price does not usually move dramatically between the time you place an order and when it fills.

ETF fees and why they matter over time

Every ETF charges an annual fee called an expense ratio, expressed as a percentage of your investment. A 0.05% expense ratio on a $10,000 investment costs $5 per year. A 0.50% ratio on the same $10,000 costs $50 per year. These fees are deducted automatically from the fund's value, so you never write a check — but they reduce your returns.

Passive ETFs that track an index typically charge between 0.03% and 0.20% per year. Actively managed ETFs, where a manager picks individual holdings, usually charge 0.50% to 1.50% or higher. Over decades, even small differences in fees compound. A 0.10% difference might not sound like much, but on a $100,000 investment over 30 years, it can mean tens of thousands of dollars in lost growth.

You may also pay a trading commission when you buy or sell an ETF, depending on your brokerage. Many brokerages now offer commission-free ETF trading, but some still charge $5 to $10 per trade. Check your brokerage's fee schedule before you open an account. Some brokerages waive commissions on their own ETFs but charge for others.

Types of ETFs and what they track

ETFs exist for nearly every investment category. Stock ETFs own shares of companies and might track a broad index like the S&P 500, a specific sector like technology or healthcare, or a specific country or region. Bond ETFs own government or corporate bonds and let you own a diversified collection of fixed-income investments. Commodity ETFs track the price of gold, oil, natural gas, or agricultural products.

Specialty ETFs track narrower themes. Some focus on dividend-paying stocks, some on small-cap companies, some on companies with strong environmental practices, some on emerging markets. There are ETFs that track cryptocurrencies, real estate investment trusts (REITs), and even inverse indexes that go up when the market goes down. The variety means you can build a portfolio tailored to your goals and beliefs, but it also means you need to understand what each ETF actually holds.

The fund name usually tells you what it tracks. An ETF named "Vanguard S&P 500" tracks the S&P 500 index. An ETF named "iShares MSCI Emerging Markets" tracks emerging market stocks. Read the fund's prospectus or fact sheet on the fund company's website to confirm what you are buying, because similar-sounding names can track very different things.

ETFs versus mutual funds and individual stocks

ETFs and mutual funds both hold baskets of investments, but they differ in how you trade them and how they price. You buy and sell ETFs during market hours at changing prices. Mutual funds price once per day after the market closes, and you buy or sell at that day's closing price regardless of when you placed your order. ETFs typically have lower fees than actively managed mutual funds, though some mutual funds track indexes at competitive prices.

Buying an ETF is simpler than buying 100 individual stocks, but it gives you less control over exactly which companies you own. If you buy a stock ETF, you own pieces of all the holdings, not just the ones you think are good. That lack of control is actually an advantage for most people — it forces diversification and prevents you from making concentrated bets on single companies.

ETFs also offer tax advantages in taxable accounts. Because most ETFs are passively managed and do not trade holdings frequently, they generate fewer taxable capital gains distributions than actively managed mutual funds. This means more of your money stays invested and working for you instead of going to taxes each year.

How to buy an ETF

You buy an ETF through a brokerage account — an online platform like Fidelity, Charles Schwab, E-Trade, or Vanguard. You do not buy directly from the fund company. Open an account at a brokerage, link a bank account to fund it, search for the ETF by its ticker symbol (a short code like SPY for the SPDR S&P 500 ETF), and place a buy order.

Most brokerages let you buy fractional shares, meaning you do not need enough money to buy a full share. If an ETF costs $200 per share and you have $100, you can buy 0.5 shares. This makes it easier to invest smaller amounts and to diversify across multiple ETFs without needing thousands of dollars.

Before you buy, check the ETF's expense ratio, trading volume, and holdings. High trading volume means you can buy and sell without difficulty. Low volume can mean wider spreads between the buy and sell price, costing you money. The holdings tell you what you actually own — make sure it matches what you think you are buying.

Frequently Asked Questions

Do I get dividends from an ETF?

Yes, if the ETF holds dividend-paying stocks or bonds, it collects those dividends and distributes them to shareholders. You can usually choose to receive the cash or reinvest it automatically. Dividend distributions are taxable in a regular brokerage account, though not in retirement accounts like IRAs.

Can an ETF go to zero?

An individual ETF can decline sharply if its holdings lose value, but it does not go to zero unless every single holding becomes worthless, which is extremely rare. Broad market ETFs like those tracking the S&P 500 are very unlikely to lose all value because they own hundreds of companies across many industries.

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

An index fund is a type of mutual fund or ETF that tracks an index. So all index funds are either mutual funds or ETFs, but not all ETFs are index funds — some are actively managed. The key difference is how you trade them: index ETFs trade during market hours like stocks, while index mutual funds price once daily.

How much money do I need to start buying ETFs?

Most brokerages have no minimum investment. You can open an account with $1 and buy fractional shares of an ETF. However, some brokerages charge account maintenance fees if your balance falls below a certain level, so check the fee schedule before opening an account.

Are ETFs safer than individual stocks?

ETFs spread your money across many holdings, so a single company's failure does not wipe out your investment. This diversification reduces risk compared to owning one or two stocks. However, all investments carry risk, and an ETF can still lose value if its holdings decline in value.