The Budapest Stock Exchange Ltd. calculates and publishes on continuous base the BUMIX index that reflects the performance of listed shares with medium and small capitalisation since June 1, 2004. BUMIX operates, (similarly to BUX) as a total return index, i.e. the dividend payout also plays a role in its performance evaluation. Only those series of shares can be admitted to the BUMIX basket where the market capitalisation adjusted for free float does not exceed HUF 125 billion. The calculation method, the review and the handling of corporate actions is the same to the process applied in the case of the BUX index.