How it is worked out
Its price follows the value of what it holds. Most of them track an index, such as the S&P 500.
How to read it
- One purchase buys a piece of many companies, not of one.
- Two ETFs with different names can hold almost the same stocks: that is what overlap shows.
Example
An S&P 500 ETF holds all 500 companies of the index, each at its weight.