Definition
A basket of securities that trades on an exchange like a single stock. Most ETFs track an index and have low expense ratios.
In depth
An exchange-traded fund (ETF) is an investment fund that holds a collection of assets — stocks, bonds, commodities, or other securities — and trades on a stock exchange just like an individual stock throughout the trading day. This intraday tradability distinguishes ETFs from traditional mutual funds, which price and can only be bought or sold once daily at market close.
Most ETFs are passively managed, tracking a specific market index (like the S&P 500) rather than relying on fund managers to actively select securities. This passive structure produces dramatically lower costs: major US index ETFs charge expense ratios of 0.03%–0.20% annually, versus 0.50%–1.5% or more for actively managed funds. On $100,000 invested over 30 years, the difference between a 0.05% and 1.0% expense ratio amounts to roughly $80,000 in additional wealth through compounding.
The first ETF — the SPDR S&P 500 ETF Trust (SPY) — launched in January 1993. Today, thousands of ETFs cover virtually every investable asset class: US and international equities, government and corporate bonds, real estate investment trusts (REITs), commodities (gold, silver, oil), sector-specific exposures (technology, healthcare, financial services), factor strategies (value, momentum, quality), and thematic approaches (clean energy, artificial intelligence, cybersecurity).
ETFs are uniquely tax-efficient compared to mutual funds. Their in-kind creation/redemption mechanism — where large institutional investors exchange baskets of underlying securities directly for ETF shares — minimizes taxable capital gains distributions that would otherwise be passed to all shareholders.
Frequently asked questions
What is the difference between an ETF and a mutual fund?
Both pool investor money to hold diversified assets, but ETFs trade intraday on exchanges at market price while mutual funds price once daily at net asset value. ETFs typically have lower expense ratios, are more tax-efficient in taxable accounts, and have no minimum investment beyond the share price. Mutual funds may offer automatic investment features and certain institutional share classes. For most individual investors, low-cost index ETFs are the preferred vehicle.
Are ETFs appropriate for beginning investors?
Yes — low-cost broad-market index ETFs are ideal for most investors at any level. A simple combination like VTI (total US stock market) and VXUS (international stocks) provides immediate diversification across thousands of companies at minimal cost, requiring no expertise in selecting individual securities. Most financial planners recommend broad index ETFs as the core of any investment portfolio.
How do ETF expense ratios affect long-term returns?
The expense ratio is an annual fee deducted from the fund's assets, reducing your effective return. For a $100,000 investment growing at 7% annually over 30 years, a 0.05% expense ratio results in a final value of approximately $757,000. A 1.0% expense ratio on the same investment produces only about $574,000. The 0.95% fee difference costs you $183,000 over that period through compounding.
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