Exchange-Traded Funds (ETFs)

An ETF lets you buy hundreds of companies with one click, the same way you would buy a single share.

By Greg Goodwin · Published October 16, 2026 · Updated October 24, 2026

Cheat Sheet

What it is: a fund that holds a basket of assets and whose shares trade on a stock exchange throughout the day.
First US ETF: the SPDR S&P 500 ETF (ticker SPY), launched in January 1993.
Cost: broad index ETFs often charge expense ratios of about 0.03% to 0.20% a year.
Pricing: shares trade at market prices that move all day, unlike mutual funds, which price once after the close.
Mechanism: large institutions called authorized participants create and redeem shares, which keeps the price close to the value of the holdings.
Risk: leveraged and inverse ETFs reset daily and are generally designed for short-term use, not buy-and-hold.

The 60-Second Version

An exchange-traded fund pools investors' money and uses it to hold a portfolio of securities, such as stocks, bonds, or commodities. Unlike a traditional mutual fund, ETF shares trade on an exchange all day, like stock. Most ETFs follow an index: an S&P 500 ETF, for example, holds roughly the 500 companies in that index, in similar proportions. Because they simply track an index, many charge very low annual fees, and their structure tends to produce few taxable distributions. Risks include the ups and downs of the markets they hold, and some specialized products, such as leveraged ETFs, behave differently from what investors often expect. This is general education, not personalized investment advice.

The Long Version

How an ETF Works

A fund company designs an ETF to follow a defined set of holdings. Rather than selling shares to investors directly, the fund works with authorized participants, large firms that deliver a basket of securities to the fund in exchange for new ETF shares, or the reverse. This "creation and redemption" process lets the supply of shares expand or shrink so that the ETF's market price stays close to the value of its holdings. Ordinary investors buy and sell through a brokerage account, just as with stocks.

History

Index funds for individual investors began in 1976 when John Bogle launched what is now Vanguard's 500 Index Fund. The first US ETF, SPY, arrived in 1993 from State Street. Over the next three decades, ETFs spread into bonds, commodities, international markets, and specific sectors. Today thousands trade in the US, holding trillions of dollars.

Costs and Taxes

The main cost is the expense ratio, but there are others: the bid-ask spread, which matters especially for thinly traded ETFs, and possible brokerage commissions, though many brokers now charge none. ETFs are often tax-efficient because the in-kind creation and redemption process lets funds remove low-cost-basis shares without selling them, reducing capital gains distributions compared with some mutual funds. Taxes still apply when you sell at a gain, and rules vary by account type and country.

Types and Uses

Broad-market stock ETFs offer instant diversification. Bond ETFs hold portfolios of government or corporate debt. Sector ETFs focus on areas such as health care or technology. There are also commodity, currency, thematic, and actively managed ETFs. Investors use them for retirement savings, for adjusting asset allocation, and for exposure to markets that are hard to access directly.

Cautions

Complex products can carry hidden risks. Leveraged and inverse ETFs seek a multiple of a daily return, and over longer periods their results can diverge sharply from expectations. Niche or thinly traded ETFs may have wide spreads or trade away from their underlying value in stressful markets. Before buying, check what the fund holds, its fees, and how long it has been trading. A licensed advisor can help match investments to goals and risk tolerance.

Why People Care

ETFs made diversified, low-cost investing accessible to ordinary people and changed how the investment industry works. Understanding them is a practical step toward understanding retirement accounts and long-term investing.

Glossary

Expense ratio: The annual fee, expressed as a percentage of assets, that a fund deducts to cover its costs.
Bid-ask spread: The difference between the highest price a buyer will pay and the lowest price a seller will accept.
Authorized participant: A large financial firm that can create or redeem blocks of ETF shares.
Tracking error: How far a fund's returns deviate from the index it follows.
Limit order: An instruction to buy or sell only at a specified price or better.

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