What an ETF is in plain words: how an exchange-traded fund works
An ETF is a way to buy hundreds of companies in a single purchase. For most people it is the simplest and most reliable entry into investing.
- An ETF is a basket of hundreds of companies bought like one share.
- To start you want a broad, large and cheap whole-market fund.
- A fund falls with the market: it is an investment for years, not months.
What it is
An ETF is an exchange-traded fund. Picture a basket holding the shares of five hundred companies. The basket is cut into millions of identical slices, and each slice trades on an exchange like an ordinary share. Buy one slice and you own a small part of all five hundred companies at once.
What goes into the basket is set by an index — a list of companies drawn up by a rule. The S&P 500, for example, is the 500 largest US companies. The fund simply copies the list and picks nobody itself.
Why a fund beats single stocks
- No guessing. One company can go bust. Five hundred at once cannot.
- Cheap. Large funds charge hundredths of a percent a year.
- No time needed. The line-up updates itself: weak companies drop out, strong ones take their place.
- Accessible. One slice costs like one share — tens to hundreds of dollars.
What kinds exist
| What is inside | What for | Example |
|---|---|---|
| Whole-market stocks | The core of a portfolio, growth for years | VOO, VTI, VT |
| Dividend stocks | Regular payouts | SCHD, VYM |
| Bonds | The calm part, smaller swings | BND, AGG |
| A sector | A bet on one industry — higher risk | XLK, XLV |
| Gold | Protection in crises | GLD, IAU |
These are examples for orientation, not a recommendation. You can see the holdings of each on the site — down to the last one.
What it costs
A fund has a management fee — a percentage of your sum per year. It is not charged separately: it is taken out of the fund's price a little every day. The gap between 0.03% and 1% a year looks trivial, but over thirty years it eats a noticeable part of the result.
The second cost is the broker's commission on purchases. At most large brokers it is small or zero.
How to choose your first fund
- Broad, not narrow. A whole-market fund rather than one sector or theme.
- Large. A big fund will not be closed and is easy to buy and sell.
- Cheap. A fee of tenths or hundredths of a percent.
- Look inside. Two funds with different names often hold the same companies.
What you risk
- A fund falls with the market. In the 2008 crisis US stock funds lost about half their value and took several years to recover.
- Narrow funds are riskier. A sector or “trendy” fund can fall harder and for longer.
- Currency. A US stock fund is a dollar asset even when bought in another currency.
Open any fund: price, history, every holding inside and a side-by-side comparison of two funds.
Funds in the Analyst →This article is educational and is not investment advice. Past results do not guarantee future ones.