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

An exchange-traded fund (ETF) is a basket of investments — usually stocks, bonds, or a mix of both — bundled together and sold as one security. You buy and sell it the same way you would buy and sell a single company's stock: through a brokerage account, during market hours, at a price that changes throughout the day. The fund itself is managed by a company that decides what goes inside it, collects fees, and handles the paperwork.

The core idea is simplicity. Instead of buying 50 different stocks one by one, you buy one ETF that already holds 50 stocks. You own a small piece of each holding without having to pick them yourself or manage them individually. The ETF does that work for you.

Key Takeaways

  • An ETF holds a collection of stocks, bonds, or other securities and trades on a stock exchange like a single stock would.
  • You can buy and sell ETF shares during market hours at prices that change throughout the day, unlike mutual funds which price once per day.
  • ETFs charge annual fees (called expense ratios) that vary widely, typically ranging from under 0.1% to over 1% per year depending on the fund.
  • Most ETFs track an index — a preset list of securities — rather than being actively managed by a fund manager making daily decisions.
  • You can hold an ETF in any brokerage account, including retirement accounts like IRAs and 401(k)s.

How an ETF differs from a mutual fund

Both ETFs and mutual funds hold baskets of investments, but they work differently in practice. A mutual fund prices once per day, after the market closes, and you buy or sell at that single daily price. An ETF prices continuously during market hours, so the price changes minute by minute as people buy and sell shares. This means you can trade an ETF whenever the market is open, but you cannot trade a mutual fund until the next day.

ETFs also tend to have lower fees. A typical ETF expense ratio (the annual cost to own it) might be 0.05% to 0.20% per year. A typical mutual fund might charge 0.50% to 1.50% or more. Over decades, that difference compounds significantly. ETFs are also more tax-efficient in most cases because of how they are structured and traded.

Index-tracking ETFs versus actively managed ETFs

Most ETFs are index-tracking, meaning they follow a preset list of securities. An S&P 500 ETF, for example, holds the same 500 large-cap stocks as the S&P 500 index itself. The fund manager does not pick winners or try to beat the market — they straightforward own what the index owns. This is why index-tracking ETFs have such low fees: there is little active decision-making involved.

Some ETFs are actively managed, meaning a fund manager or team makes decisions about what to buy and sell to try to outperform the market. These ETFs charge higher fees because the manager's work costs money. Whether active management is worth the extra cost is a long-running debate among investors, but index-tracking ETFs have become far more popular because of their low cost and consistent results.

What you actually own when you buy an ETF

When you buy shares of an ETF, you own a fractional stake in every holding inside that fund. If an ETF holds 100 stocks and you own one share, you own 1/100th of the fund's position in each of those 100 stocks. If the fund holds $10 million in total assets and you own 1,000 shares out of 1 million shares outstanding, you own roughly $10,000 worth of the fund's holdings.

You do not own the stocks directly — the ETF company does. But you are may have access to to your share of any dividends the stocks pay, and you benefit from any price increases. If the stocks inside the ETF go up in value, your ETF shares go up too. If they go down, so do your shares.

Common types of ETFs and what they track

ETFs exist for nearly every investment category. Stock ETFs hold 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 hold bonds issued by governments or corporations and offer steadier income than stock ETFs, though usually with lower growth potential. Commodity ETFs track the price of oil, gold, or other raw materials. Dividend ETFs focus on stocks known for paying regular dividends.

There are also target-date ETFs, which automatically shift from stocks to bonds as you approach retirement, and factor-based ETFs, which focus on stocks with specific traits like low price or high quality. The variety is enormous, which is both useful and a source of confusion for new investors. You can find an ETF for almost any investment idea you have.

Fees and costs you will encounter

The main cost of owning an ETF is the expense ratio, expressed as a percentage of your investment per year. A 0.10% expense ratio on a $10,000 investment costs you $10 per year. A 1.00% expense ratio on the same $10,000 costs $100 per year. Expense ratios vary widely depending on what the ETF holds and how it is managed. Broad index ETFs often charge under 0.15% per year, while specialized or actively managed ETFs may charge 0.50% to 1.50% or more.

You may also pay a trading commission when you buy or sell ETF shares, though many brokerages now offer commission-free ETF trading. Some ETFs have a small bid-ask spread — the difference between what buyers will pay and what sellers are asking — which you pay when you trade. For popular ETFs with high trading volume, this spread is usually tiny. For obscure or thinly traded ETFs, it can be meaningful.

How to buy an ETF through a brokerage account

To buy an ETF, you need a brokerage account with a firm like Fidelity, Charles Schwab, E*TRADE, or similar. 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) or by name. You enter the number of shares you want to buy, review the price, and confirm the order. During market hours (typically 9:30 a.m. to 4:00 p.m. Eastern time on weekdays), your order executes almost when ready at the current market price.

You can hold ETFs in regular taxable brokerage accounts, retirement accounts like traditional or Roth IRAs, 401(k) plans (if your plan allows it), and education savings accounts like 529 plans. The tax treatment depends on the account type and how long you hold the ETF, but the mechanics of buying and selling are the same across all account types.

Frequently Asked Questions

Can I lose money in an ETF?

Yes. If the stocks or bonds inside the ETF decline in value, your ETF shares decline too. ETFs are not insured or may provide. However, if you own a diversified ETF holding many securities, a single bad investment will not wipe out your entire position the way it might if you owned a single stock.

Do I get dividends from an ETF?

Most ETFs that hold dividend-paying stocks pass those dividends on to you. You can usually choose to receive the cash or reinvest it automatically to buy more shares. Bond ETFs also distribute interest income. Check the ETF's prospectus or fact sheet to see what distributions it typically pays and how often.

What is the difference between an ETF and a stock?

A stock is ownership in a single company. An ETF is ownership in a fund that holds many stocks (or bonds, or other securities). When you buy a stock, you are betting on that one company. When you buy an ETF, you are spreading your money across many holdings, which reduces risk but also limits the upside if one company soars.

Can I trade an ETF after the market closes?

Most ETFs can only be traded during regular market hours, 9:30 a.m. to 4:00 p.m. Eastern time on weekdays. Some brokerages offer after-hours trading, but prices are less reliable and spreads are wider because fewer people are trading. For most investors, regular market hours trading is sufficient.

How do I know which ETF to choose?

Start by deciding what you want to own — broad stock market exposure, bonds, a specific sector, or something else. Then compare ETFs in that category by expense ratio, trading volume, and how long they have been around. Lower expense ratios and higher trading volume are generally better. Many investors start with a straightforward, low-cost broad market index ETF and add others as their strategy becomes clearer.