A basket in one share
Many holdings, one trade.
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The magic of compound interestIndex funds 101: boring beats cleverWhat an ETF isIndex funds, mutual funds and ETFs comparedThe S&P 500, explainedTotal market fundsInternational diversificationSector and thematic fundsThe three-fund portfolio and rebalancingDollar-cost averaging: investing without timing the market
What an ETF is
An exchange-traded fund holds a basket of investments and trades on an exchange like a single share.
In this lesson you will
- Explain what an ETF holds
- List what to check before buying one
- Recognise narrow versus broad ETFs
An exchange-traded fund (ETF) is a fund that holds a basket of investments — stocks, bonds or both — and whose shares trade on an exchange throughout the day, like a single company’s stock.
What you own
Buying one ETF share gives you a small slice of everything the fund holds. Many ETFs track an index, so their holdings follow a published list rather than a manager’s picks.
Why people use them
- Diversification in a single purchase.
- Often low annual costs, especially for index-tracking ETFs.
- Trading during market hours at a visible price.
- Holdings are usually published frequently.
What to check
Read the fund’s stated objective, expense ratio, what index or strategy it follows, how many holdings it has and the bid-ask spread. Two ETFs with similar names can hold very different things.
Risks
An ETF is only as diversified as its holdings. A narrow ETF focused on one sector or theme can be as volatile as a few individual stocks. Education only — GetGuac does not recommend specific funds or investments.
By the GetGuac team · Editorial policy
Three ideas to keep
Names can mislead
Read the holdings, not the title.
Costs compound too
The expense ratio is charged yearly.
Do it in 4 steps
Read the objective
What it tries to do.
Check cost and spread
Expense ratio and bid-ask.
Look at holdings
Number and concentration.
Compare with your goals
Broad or narrow.
What one share holds
Made-up ETF with net assets of $1,000,000,000 split across 500 companies, and 20,000,000 shares.
| Item | Value |
|---|---|
| Value per ETF share | $50 |
| Number of holdings | 500 |
| Annual cost at 0.10% on $5,000 | $5 |
$1,000,000,000 ÷ 20,000,000 = $50 per share; each share owns a slice of all 500 companies.
Where this usually goes wrong
- Buying on the name alone
- Assuming every ETF is diversified
- Ignoring trading spreads
Find any broad ETF’s fact sheet and note its expense ratio and number of holdings.
Tools and guides for this lesson
Quick quiz
1. An ETF share gives you…
2. ETFs trade…
3. A narrow theme ETF can be…
0 of 3 answered
Puzzle
You invest $12,000 in an ETF with a 0.25% expense ratio. What is the yearly cost?
Show the answer
$30
$12,000 × 0.0025 = $30.