Exchange-Traded Fund (ETF)
By WikiWealth Editorial Team|Last updated:
Key Takeaways
- An ETF is a basket of securities that trades on an exchange like a stock
- ETFs offer diversification, low costs, and tax efficiency in a single investment
- They can track indices, sectors, commodities, bonds, or specific investment strategies
- ETFs typically have lower expense ratios than comparable mutual funds
Definition
An exchange-traded fund (ETF) is a type of pooled investment security that holds a collection of assets — such as stocks, bonds, commodities, or a mix — and trades on a stock exchange just like an individual stock. ETFs are designed to track a specific index, sector, commodity, or investment strategy. They combine the diversification benefits of mutual funds with the trading flexibility and transparency of stocks.
How It Works
ETFs are created through an authorized participant (AP) process. Large institutional investors deposit a basket of the underlying securities with the ETF provider and receive ETF shares in return (creation). The reverse process (redemption) allows APs to exchange ETF shares for the underlying securities. This creation/redemption mechanism keeps the ETF's market price close to its net asset value (NAV). Investors buy and sell ETF shares on exchanges throughout the trading day at market prices, just like stocks. Most ETFs are passively managed, tracking an index like the S&P 500, though actively managed ETFs are a growing segment.
Example
An investor wanting broad U.S. stock market exposure could buy shares of a total stock market ETF (such as one tracking the CRSP US Total Market Index) for around $250 per share. That single share gives them exposure to over 3,500 U.S. stocks across all market capitalizations. With an expense ratio of just 0.03%, the annual cost on a $25,000 investment is only $7.50 — far less than typical mutual fund fees.
Why It Matters
ETFs have revolutionized investing by making diversified, low-cost portfolios accessible to individual investors. They have grown to over $10 trillion in global assets and now account for a significant portion of daily stock market trading volume. For most individual investors, a portfolio of a few broad ETFs covering stocks and bonds can provide the diversification that previously required dozens of individual securities or expensive actively managed funds. Explore ETF holdings and strategies on the WikiWealth Stock Screener.
Advantages
- Low expense ratios, often 0.03% to 0.20% for broad index ETFs
- Instant diversification across hundreds or thousands of securities
- Tax-efficient structure that minimizes capital gains distributions
- Intraday trading flexibility with transparent, real-time pricing
Limitations
- Brokerage commissions and bid-ask spreads add trading costs (though many brokers now offer commission-free ETF trades)
- Some niche or leveraged ETFs have high expense ratios and complex structures
- Intraday trading can encourage short-term speculation rather than long-term investing
- ETF prices can deviate from NAV during periods of market stress or illiquidity
Frequently Asked Questions
Related Terms
Browse more definitions in the financial terms glossary.