A stock market index is a measure that shows how a group of companies is performing on the stock market. It is used to analyse economic trends, assess specific sectors or compare the performance of different investments.
Its value is calculated based on changes in the prices of the constituent shares, which indicates whether the market is rising or falling.
Stock market indices can be classified according to various criteria:
- By geographical location: they group together companies from the same country or region.
- By economic sector: they reflect the performance of specific industries, such as technology, energy or finance.
- By asset type: some indices include, in addition to shares, bonds or other financial instruments.
Some of the most prominent indices are:
- Dow Jones Industrial Average (DJIA): one of the oldest and best-known indices, comprising 30 major US companies.
- Eurostoxx 50 or Stoxx 50: comprises the 50 most important companies in the Eurozone.
- IBEX 35: the main benchmark index of the Madrid Stock Exchange, comprising 35 of Spain’s leading companies.
These indices are used by investors, analysts and economists to assess the health of the market and make financial decisions.
