The Amsterdam Exchange Index, also known as the AEX, is a stock market index that represents the performance of the 25 largest companies listed on the Euronext Amsterdam. It serves as a key indicator of the overall health of the Dutch stock market and is widely followed by investors. The AEX is calculated based on the market capitalization of its constituent companies, which include well-known firms from various sectors. Changes in the index reflect the collective performance of these companies, making it a valuable tool for assessing market trends and investment opportunities in the Netherlands.