It is one of the most liquid indices for the Eurozone: an ideal underlying for financial products or for benchmarking purposes. Additionally, the index serves as an underlying for many strategy indices, such as the EURO STOXX 50 Risk Control Indices. Buffers are used to achieve the fixed number of components and to maintain stability of the indices by reducing index composition changes. Selection methodology ensures a stable and up-to-date index composition. Fast-entry and fast-exit rules ensure the index accurately represents the performance of only the biggest and most liquid stocks.