The investing essentials / 02
ETFs, made understandable.
Learn what’s inside a fund, what it costs, and how to compare your options.
01 / Understand ETFs
One fund. A collection of investments.
An exchange-traded fund (ETF) pools investors’ money into a portfolio. You buy shares of the fund on a stock exchange.
Think of a fund as a basket. What matters is what’s inside: it might hold stocks, bonds, or a mix. Buying an ETF does not automatically mean you own the whole market.
A basket, made concrete.
A fictional fund · not a suggested portfolio
Imagine a fund holding three businesses: a coffee company, a software company, and a grocery chain.
When you buy a share of the fund, you get exposure to its combined holdings. You own a share of the ETF, rather than three individual stocks in your account.
What one share of the fund holds
What if just one company’s stock falls 10%?
Pick a company to see how much the fund moves.
Weights are illustrative. The math ignores every other price move that day.
The holdings may have different weights. One company’s price move won’t necessarily affect the fund as much as another’s.
What kinds of ETFs are there?
Broad stock funds cover a wide market.
Sector funds focus on an industry.
Bond funds hold debt investments.
International funds invest outside the U.S.
Allocation funds combine asset classes.
Are all ETFs index funds?
No. Index ETFs seek to track a benchmark. Active ETFs use a manager’s investment decisions. “ETF” describes a fund structure, not a single strategy or risk level.
How is an ETF different from a mutual fund?
ETF shares trade throughout the trading day at market prices. Mutual fund orders generally execute at the next calculated net asset value (NAV), usually after the market closes.
Learn more: SEC’s guide to ETFs ↗
02 / Costs and risks
Know what you pay. Know what you own.
A low fee is useful, but it doesn’t make a fund safe. Its holdings and strategy determine the risks you take.
What does an expense ratio cost?
A simplified example using $10,000
An expense ratio is the fund’s annual operating expenses as a percentage of assets. Try three illustrative rates:
Approximate annual fund expenses at a 0.03% expense ratio.
Yearly cost on $10,000
Assumes a constant $10,000 value for one year. Expenses are deducted within the fund, not billed separately. Excludes trading costs and taxes; actual costs vary with your balance.
A basket can still be concentrated.
Many holdings may depend on the same industry or a few large companies. Look at their weights, not just their count.
The investments can lose value.
Stock and bond ETFs both face investment risks. Diversification does not prevent market losses.
Trading has costs, too.
The bid-ask spread and any brokerage charges add to costs. An ETF’s trading price can differ from the value of its underlying assets.
What about leveraged or inverse ETFs?
These are complex products. Many target a multiple or the opposite of a daily return. Over longer periods, compounding can produce very different results. Read the fund’s prospectus before considering one.
Further reading: SEC’s explanation of ETF costs and risks ↗
03 / Choose a fund
Start with the job you need it to do.
“What would this fund add to my portfolio?”
Write your answer before searching for tickers. You might be researching a broad stock market, bonds, or international investments. Compare funds with similar objectives.
Open the fund’s own documents.
Find its current prospectus, holdings, and fact sheet on the issuer’s website. Start with the objective and main risks.
Look inside the portfolio.
Check the largest holdings, their weights, and overlap with investments you already own. Two funds can contain many of the same companies.
Compare the full cost.
Check annual expenses, fee-waiver expiry dates, trading spreads, and account charges. A lower share price does not mean a cheaper fund to own.
What should I check with a broker?
Ask about account eligibility, fees, fractional ETF shares, recurring investments, and customer support. Check registration through FINRA BrokerCheck.
Where do accounts and taxes fit in?
An ETF is an investment; a brokerage account or IRA is where you may hold it. Tax treatment depends on the account and investment. Explore the retirement account guide and IRS investment income guidance for details.
Which terms should I learn first?
Holdings: investments inside the fund.
Expense ratio: annual fund expenses as a percentage of assets.
NAV: net asset value per share.
Spread: the gap between bid and ask prices.