The AEX Index is a stock market index that represents the performance of the 25 largest companies listed on the Euronext Amsterdam exchange in the Netherlands. It serves as a key indicator of the Dutch stock market's overall health and is widely used by investors to gauge market trends. The index is calculated based on the market capitalization of its constituent companies, which include well-known firms from various sectors. Changes in the AEX Index reflect the collective performance of these companies, making it an important tool for both local and international investors interested in the Dutch economy.