AEX 25 Index components | values (NL0000000107)
The AEX index is a price index. It comprises up to 25 public companies that are traded on Euronext Amsterdam. The index level is determined solely on the basis of share prices and only adjusted for income from subscription rights and special payments. The calculation is updated every second during trading hours from 9:00 a.m. to 5:30 p.m. CET. The determination of the index members is based on criteria that tend to be exceptions on an international scale. What stands out is the condition that at least 10 percent of the outstanding shares must have been traded at a given value in the year - a tribute to the fact that many securities are rather thin in trading despite high market capitalization.
The focus on liquidity and free float instead of the market value is also expressed by the fact that at least a quarter of the outstanding shares must be widely diversified. When determining the free float value relevant for the weighting, there is also a summary of classes: In the case of free float between 25 and 50, 50 and 75 and 75 and 100 percent, the upper class limit is used as the weighting factor. Originally, a decision was made on every third Friday in February about which stock corporations should remain in the index and which should be replaced and whether the weighting of the individual stocks had to be adjusted. The changes are now made quarterly.