What is an ETF? ETF stands for exchange-traded fund. It’s a basket of investments, such as stocks or bonds, that you can buy and sell on a stock exchange just like a single share. When you buy one share of an ETF, you own a small slice of everything the fund holds. For example, an ETF that tracks the S&P 500 index gives you exposure to about 500 large U.S. companies in a single purchase. ETFs are popular because they’re usually low-cost, easy to trade and offer instant diversification.
If you’ve heard people talk about “index investing” or “just buy the S&P 500,” they’re usually talking about ETFs (or their close cousins, index mutual funds). This guide explains what an ETF is in plain English, how ETFs work, the main types, what they cost, the risks, and how beginners typically buy them.
*This article is general education, not financial advice. Investing involves risk, including the possible loss of money.*
Key takeaways
- What is an ETF? A fund that holds many investments and trades on an exchange like a stock.
- ETF stands for exchange-traded fund.
- Most ETFs track an index, such as the S&P 500, so they offer broad diversification.
- ETFs trade throughout the day at market prices, unlike mutual funds, which price once a day.
- Costs are shown as an expense ratio, an annual fee taken from the fund’s assets.
- You buy ETFs through a brokerage account, often with no commission.
What does ETF stand for?
ETF stands for exchange-traded fund. Each word tells you something:
| Word | What it means |
|---|---|
| Exchange-traded | It’s listed on a stock exchange, so you buy and sell it during market hours at the current price |
| Fund | It pools money from many investors to buy a collection of assets |
So an ETF is a pooled investment fund that you trade on an exchange. That combination is what makes ETFs different from traditional mutual funds.
What is an ETF and how does it work?
Here’s the basic idea, step by step:
- A fund company creates the ETF and decides what it will hold, often by matching an index, such as the S&P 500 or a bond index.
- The fund buys the underlying investments, such as shares of hundreds of companies.
- The ETF issues shares that trade on a stock exchange.
- Investors buy and sell those shares through brokerage accounts, at prices that move during the trading day.
- Special firms called authorized participants can create or redeem large blocks of ETF shares. This process helps keep the ETF’s market price close to the value of what it holds.
You don’t need to understand step 5 to invest, but it explains why ETF prices usually stay close to the value of their underlying holdings.
A simple example
Imagine an ETF that tracks the S&P 500. You buy one share for around the price of the fund that day. With that one purchase, you own a tiny piece of companies like Apple, Microsoft and Amazon, along with hundreds of others. If those companies rise in value overall, your ETF share rises too. If they fall, so does your ETF. Many of these funds also pass along the dividends the companies pay.
Compare that with buying individual shares: to get similar diversification yourself, you’d need to buy hundreds of different stocks.
Main types of ETFs
There are thousands of ETFs. Here are the main categories.
| Type of ETF | What it holds | Typical use |
|---|---|---|
| Stock (equity) index ETFs | Shares tracking an index like the S&P 500 or a total market index | Broad, long-term growth |
| Bond ETFs | Government, corporate or municipal bonds | Income and stability |
| Sector ETFs | Companies in one industry, such as technology or healthcare | Targeting a specific sector |
| International ETFs | Companies outside the U.S. | Global diversification |
| Dividend ETFs | Companies that pay regular dividends | Income |
| Commodity ETFs | Gold, oil or other commodities, or futures contracts on them | Exposure to commodity prices |
| Actively managed ETFs | Investments chosen by a manager rather than an index | Trying to beat the market |
| Leveraged and inverse ETFs | Use derivatives to multiply or reverse daily index returns | Short-term trading, high risk |
Leveraged and inverse ETFs deserve a warning. The U.S. Securities and Exchange Commission (SEC) and FINRA have cautioned that these products are designed for short-term trading and can behave very differently from what you’d expect if held for longer periods. They’re generally not suitable for beginners.
What is an ETF vs a mutual fund?
ETFs and mutual funds both pool money to buy a diversified portfolio. The differences are mostly in how you buy and sell them.
| ETF | Mutual fund | |
|---|---|---|
| How it trades | On an exchange, throughout the day | Directly with the fund company |
| Price | Changes during market hours | Set once a day after the market closes (net asset value) |
| Minimum investment | The price of one share, or less with fractional shares | Often a set minimum, such as $1,000 or more for some funds |
| Typical costs | Often low expense ratios, especially index ETFs | Varies; index funds can be cheap, active funds often cost more |
| Tax efficiency | Often more tax-efficient in taxable accounts due to how shares are created and redeemed | Can distribute more capital gains |
| Automatic investing | Depends on your broker | Usually easy to set up |
Neither is automatically better. Many long-term investors use both, especially low-cost index versions of each. We cover mutual funds in more detail in a separate guide.
What does an ETF cost?
The main cost is the expense ratio, an annual fee expressed as a percentage of your investment. It’s taken out of the fund’s assets, so you don’t pay it as a separate bill.
| Expense ratio | Annual cost on a $10,000 investment |
|---|---|
| 0.03% | $3 |
| 0.20% | $20 |
| 0.50% | $50 |
| 1.00% | $100 |
Broad index ETFs are often among the cheapest investments available. Specialised or actively managed ETFs usually cost more.
Other costs to watch:
- Trading commissions. Many large brokers now charge no commission for online ETF trades, but check your broker’s pricing.
- Bid-ask spread. The small difference between the price buyers pay and sellers receive. It’s tiny for popular ETFs and wider for thinly traded ones.
- Taxes. In a taxable account, you may owe tax on dividends and on gains when you sell.
Benefits of ETFs
- Diversification. One purchase can spread your money across hundreds or thousands of investments.
- Low costs. Many index ETFs have very low expense ratios.
- Flexibility. You can trade during market hours, like a stock.
- Transparency. Many ETFs publish their holdings daily.
- Accessibility. You can start with the price of one share, or less where brokers offer fractional shares.
Risks of ETFs
ETFs are a tool, not a guarantee. Key risks include:
- Market risk. If the market falls, a stock ETF falls with it. Diversification spreads risk but doesn’t remove it.
- Concentration risk. Sector or thematic ETFs can be heavily exposed to one industry.
- Tracking differences. An ETF may not perfectly match its index, because of fees and other factors.
- Liquidity. Thinly traded ETFs can have wider spreads.
- Complexity. Leveraged, inverse and some commodity ETFs work in ways that can surprise investors.
- Overtrading. Because ETFs are easy to buy and sell, it’s tempting to trade too often, which can hurt long-term returns.
How to invest in ETFs as a beginner
Here’s the general process most beginners follow:
- Set a goal. Are you investing for retirement, a house in ten years, or something else? Your time horizon affects how much risk makes sense.
- Open a brokerage account. This could be a regular taxable account or a tax-advantaged account such as an IRA.
- Fund the account. Transfer money from your bank.
- Research ETFs. Look at what the fund holds, its expense ratio, its size and how closely it tracks its index. The fund’s prospectus and fact sheet have the details.
- Place an order. Enter the ETF’s ticker symbol and how many shares (or dollars) you want to buy. A limit order lets you set the maximum price you’ll pay.
- Keep investing regularly. Many investors add money on a schedule, an approach known as dollar-cost averaging.
- Review occasionally. Check that your mix of investments still fits your goals, rather than reacting to every market move.
Is an ETF a good investment?
It depends on the ETF and on you. Knowing what is an ETF is only the first step; the next is knowing what a particular ETF holds. A broad, low-cost index ETF can be a simple way to build a diversified long-term portfolio, which is why many beginners start there. A narrow, leveraged or fashionable thematic ETF carries much more risk.
Before investing, think about your goals, time horizon and how you’d feel if your investment dropped 20% or more in a bad year. If you’re unsure, a fee-only financial adviser can help you build a plan.
ETFs and finance careers
ETFs have become a big part of the investment industry. They’re created and managed by asset managers, analysed by research teams and traded by market makers. If you’re interested in that side of finance, our guides to asset management careers and wealth management careers explain the roles.
What is an ETF’s NAV, and why does it matter?
Every ETF has a net asset value (NAV): the total value of everything the fund holds, minus its liabilities, divided by the number of shares. The ETF’s market price is what you actually pay on the exchange. For large, popular ETFs, the two numbers are usually very close, thanks to the creation and redemption process described earlier. For small or thinly traded ETFs, or during very volatile markets, the price can drift above the NAV (a premium) or below it (a discount). It’s one more reason beginners often stick with large, widely traded funds.
What is an ETF vs an index fund?
People often use the terms interchangeably, but they aren’t quite the same thing. An index fund is any fund that tracks an index, and it can be either a mutual fund or an ETF. An ETF describes how the fund trades, on an exchange. So many ETFs are index funds, but not all index funds are ETFs, and not all ETFs track an index. When someone asks “what is an ETF vs an index fund?”, the honest answer is that they overlap: a low-cost S&P 500 ETF is both.
Common beginner mistakes with ETFs
- Chasing last year’s winner. A fund that soared recently may simply be concentrated in a hot sector.
- Owning lots of overlapping funds. Five U.S. stock ETFs can end up holding many of the same companies.
- Ignoring costs. Small differences in expense ratios add up over decades.
- Buying leveraged ETFs by mistake. Check the fund name and prospectus for words like “2x,” “3x,” “ultra” or “inverse.”
Frequently asked questions
What is an ETF in simple terms?
An ETF is a fund that holds a collection of investments, such as stocks or bonds, and trades on a stock exchange like a single share. Buying one share gives you a small piece of everything the fund owns.
What does ETF stand for?
ETF stands for exchange-traded fund.
Are ETFs safe?
ETFs aren’t risk-free. Their value goes up and down with the investments they hold. Broad index ETFs are diversified, which reduces the risk of any single company hurting you, but they can still fall in a market downturn.
How do ETFs make you money?
ETFs can make money in two main ways: the price of the ETF can rise if its holdings increase in value, and many ETFs pay out dividends or interest from the investments they hold.
What is the difference between an ETF and a stock?
A stock is a share in one company. An ETF holds many investments, often hundreds of stocks, so it’s more diversified than owning a single stock.
How much money do I need to buy an ETF?
You need enough to buy one share at the current price, or less if your broker offers fractional shares. Many brokers have no account minimum.
The bottom line: what is an ETF?
So, what is an ETF? It’s a simple, usually low-cost way to own a diversified basket of investments through a single share that trades on a stock exchange. Broad index ETFs are a common starting point for new investors, while specialised and leveraged ETFs are better left to people who fully understand them. As with any investment, know what you’re buying, keep costs low and match your choices to your goals.
*Sources: Investor.gov (SEC), exchange-traded funds; SEC investor bulletin on ETFs; FINRA, exchange-traded funds and products.*
