It is composed of the 25 funds that trade on the exchange and that rank 26-50 in size. The funds that rank 1-25 in size are represented in the AEX index.
The index comprises the 25 funds that are actively traded on the exchange and occupy positions between 26th and 50th in terms of market share. In contrast, the AEX index focuses on the largest funds, ranking 1st to 25th in size.