Why raw point levels are not a ranking

Index levels are expressed in index points. A higher level does not establish a larger economy, a more expensive market or a better investment. Compare movements over the same period using percentage changes or a clearly defined common starting base.

Weights matter as well. Some indices give larger companies more influence, while others use a different method. A move in the overall index therefore need not describe what happened to most individual constituents.

References: Investor.gov · Index funds

Every index represents a different selection

The S&P 500, for example, focuses on large US companies. It does not represent every American business or the whole global market. Regional and technology indices likewise have their own scope. Decide which part of the market you want to examine before comparing their results.

The figures in this view may come from different trading sessions. Check each source timestamp. One retrieval time for the page does not mean that every market is open or that every observation describes the same instant.

References: S&P Dow Jones Indices · S&P 500

From a market measure to an investment product

An index and a fund that seeks to track it are different things. With an ETF, you also need to account for the particular product, its costs, listing and treatment of distributions. An index change is therefore not labelled as an investor’s net return. Use the stock table to investigate individual companies.