An ETF is a fund that holds many stocks or bonds 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 security. When you buy one share of an ETF, you own a small piece of everything inside it — perhaps 50 stocks, 200 bonds, or a mix of both. The ETF trades during market hours on exchanges like the Nasdaq or NYSE, so you can buy and sell it the same way you would buy and sell Apple or Microsoft stock.
The key difference from owning individual stocks: you get when ready diversification without having to pick and buy each holding yourself. An ETF that tracks the S&P 500, for example, holds all 500 companies in that index. If one company's stock drops, the impact on your ETF is small because you own pieces of 499 others.
ETFs are managed by investment companies — firms like Vanguard, BlackRock, and Invesco — that decide what goes into each fund and rebalance it over time. You pay a fee for this service, usually a small percentage of what you invest each year, called an expense ratio.
Key Takeaways
- An ETF holds multiple stocks or bonds and trades like a single stock on a public exchange during market hours.
- You pay an expense ratio — typically between 0.03% and 0.50% per year — to the fund company for managing the ETF.
- ETFs offer built-in diversification because one fund holds dozens or hundreds of individual securities.
- You can buy and sell ETF shares anytime the market is open, unlike mutual funds which only trade once per day after market close.
How an ETF differs from a mutual fund
Both ETFs and mutual funds hold baskets of stocks or bonds, but they trade differently. A mutual fund is priced once per day after the market closes, and all trades happen at that single price. An ETF trades throughout the day like a stock, so its price changes minute by minute based on what buyers and sellers are willing to pay.
This matters if you need to move money quickly. If you sell a mutual fund at 2 p.m., you get the price calculated at 4 p.m. when the market closes. If you sell an ETF at 2 p.m., the trade happens when ready at the 2 p.m. price. ETFs also tend to have lower expense ratios than mutual funds tracking the same index, though not always.
Types of ETFs and what they track
ETFs come in many varieties. Index ETFs track a specific benchmark — the S&P 500, the Nasdaq 100, the total U.S. stock market, or a bond index. You own whatever the index owns, in the same proportions. Sector ETFs focus on one industry, like technology, healthcare, or energy. International ETFs hold stocks from other countries. Bond ETFs hold government or corporate debt instead of stocks.
There are also actively managed ETFs, where a fund manager picks individual holdings to try to beat the market, rather than straightforward copying an index. These typically charge higher expense ratios because the manager's decisions cost more to execute.
Some ETFs use leverage or inverse strategies to amplify gains or bet against the market. These are riskier and designed for short-term trading, not long-term holding.
What you pay to own an ETF
The main ongoing cost is the expense ratio, expressed as a percentage of your investment per year. An ETF with a 0.10% expense ratio costs you $10 per year on a $10,000 investment. Index ETFs typically charge between 0.03% and 0.20% annually. Actively managed ETFs often charge 0.50% to 1.00% or more.
You may also pay a trading commission when you buy or sell — though many brokers now offer commission-free ETF trading. Some ETFs have a small gap between the buy price and sell price, called the bid-ask spread, which you lose when you trade. For popular, heavily traded ETFs, this spread is usually tiny. For obscure ETFs with few buyers and sellers, the spread can be wider.
You do not pay taxes on gains inside the ETF itself while you hold it. You pay capital gains tax only when you sell shares at a profit, or when the ETF distributes dividends to you.
How ETFs are created and managed
An investment company decides to launch an ETF, chooses what it will hold, and registers it with the Securities and Exchange Commission (SEC). The company then creates shares of the ETF and lists them on an exchange so the public can trade them.
Behind the scenes, large financial institutions called authorized participants help keep the ETF's price close to the value of what it holds. If an ETF's price drifts too high above its holdings' value, an authorized participant can buy the underlying securities, trade them to the fund company for new ETF shares, and sell those shares at a profit — a process that pushes the price back down. The reverse happens if the price drifts too low. This mechanism keeps ETF prices efficient.
The fund company rebalances the ETF periodically — selling some holdings and buying others to keep the fund aligned with its stated index or strategy. For index ETFs, rebalancing happens when the index itself changes. For actively managed ETFs, the manager rebalances based on their investment decisions.
Tax treatment of ETF distributions
When a company inside an ETF pays a dividend, the ETF collects it and distributes it to shareholders, usually once or twice per year. You receive the dividend as cash or reinvested shares, depending on your broker's settings. You owe income tax on that dividend in the year you receive it, whether you reinvest it or not.
When you sell ETF shares for a profit, you owe capital gains tax on the difference between what you paid and what you sold it for. If you held the shares for more than one year, it is a long-term capital gain, taxed at a lower rate than short-term gains. If you held them for one year or less, it is a short-term gain, taxed as ordinary income.
ETFs are generally more tax-efficient than mutual funds because of how they are structured. When other investors sell their ETF shares, it does not trigger a taxable event for you the way it does in a mutual fund. This is one reason ETFs have become popular for taxable investment accounts.
How to buy and sell ETF shares
You buy ETFs through a brokerage account — an online platform like Fidelity, Charles Schwab, E-Trade, or Vanguard. You search for the ETF by its ticker symbol (three or four letters), place an order to buy a certain number of shares, and the trade settles in two business days. You can place a market order (buy at the current price) or a limit order (buy only if the price drops to a certain level).
Selling works the same way. You log into your account, find the ETF, enter the number of shares to sell, and submit the order. The trade happens when ready during market hours, and the cash appears in your account two business days later.
Most brokers charge no commission to buy or sell ETFs, though some may charge for certain types of orders or for trading outside regular market hours.
Frequently Asked Questions
Can I lose money in an ETF?
Yes. If the stocks or bonds inside the ETF fall in value, your ETF shares fall too. An ETF that holds 500 stocks is less volatile than owning a single stock, but it can still lose 20%, 30%, or more in a bad market year. Bond ETFs can lose value if interest rates rise.
Do I get voting rights if I own an ETF?
No. The ETF company holds the shares and votes on shareholder matters. You own the ETF shares, not the underlying stocks, so you have no direct voting power. Some ETF companies publish how they vote, so you can see their positions on corporate governance issues.
What is the difference between an ETF and a stock index fund?
A stock index fund is a mutual fund that tracks an index. An ETF that tracks the same index is similar in holdings but trades like a stock during the day instead of once per day at close. ETFs tracking the same index usually have lower expense ratios than index mutual funds.
Can I hold an ETF in a retirement account?
Yes. You can buy ETFs inside an IRA, 401(k), or other retirement account just as you would in a regular brokerage account. The tax treatment of dividends and capital gains is different inside a retirement account — you do not owe taxes on them until you withdraw money in retirement.
How do I know which ETF to choose?
Compare the expense ratio, the holdings (what the ETF owns), and the trading volume (how many shares trade daily). Lower expense ratios cost you less over time. High trading volume means the bid-ask spread is usually tight. Read the fund's prospectus — a document the SEC requires that explains the fund's strategy, holdings, and risks.