Learn what exchange-traded funds are, how they're structured, and why they've become the most popular investment vehicle for beginners and professionals alike.
An Exchange-Traded Fund (ETF) is a basket of securities — stocks, bonds, or other assets — that trades on a stock exchange exactly like a single share of stock.
When you buy one share of the S&P 500 ETF called SPY, you're instantly buying a tiny slice of all 500 companies in that index — Apple, Microsoft, Amazon, and 497 others — in one transaction, at one price, through any standard brokerage account.
ETFs now hold over $13 trillion in global assets. They've grown from a niche product in the 1990s to the dominant investment vehicle used by everyone from first-time investors to trillion-dollar pension funds — because they work.
To own all 500 S&P 500 stocks individually, you'd need to buy 500 separate positions — potentially requiring hundreds of thousands of dollars and paying 500 commissions. An ETF packages all 500 into one share you can buy for ~$560 (as of 2024).
Actively managed funds charge 0.5–1.5% per year and the majority still underperform their benchmark index over 15 years. ETFs that simply track an index charge as little as 0.03% — and you capture the full market return.
An ETF is a legal entity — a fund — that owns a portfolio of underlying assets. When you buy an ETF share, you own a proportional claim on that portfolio. The fund is managed by a provider (like Vanguard, BlackRock, or State Street) who maintains the holdings.
Unlike mutual funds (which price once at day's end), ETFs trade continuously on exchanges at market prices throughout the day. You can buy, sell, or even set limit orders — just like a regular stock.
But what stops the ETF price from drifting far above or below the value of its holdings? The answer is the creation/redemption mechanism: large financial institutions called Authorized Participants can create new ETF shares by delivering the underlying basket of stocks, or redeem ETF shares for the underlying stocks. This arbitrage keeps the ETF price tightly aligned with its Net Asset Value (NAV).
Net Asset Value — the total market value of all the ETF's holdings divided by the number of shares. The 'true' per-share value.
The small gap between the buying price and selling price. Tighter on popular ETFs (SPY: ~$0.01), wider on niche ETFs.
The live trading price on the exchange. Stays very close to NAV thanks to arbitrage by Authorized Participants.
When the ETF trades slightly above (premium) or below (discount) NAV. Usually tiny for popular ETFs.
What does it mean for an ETF to 'track an index'?
How is an ETF different from an individual stock in terms of how you buy it?
You invest $1,000 in an ETF that holds 500 different stocks. One of those companies goes bankrupt. What happens to your investment?
Explore the top holdings inside any major ETF and compare them side by side using our stock analysis tools.