The RTS Index is the official RTS Stock Exchange benchmark. It is calculated during trading session after every change in the price of every security-constituent of the Index. The first index value calculated during the session is considered the opening value, and the last calculated index value is considered the closing value. Index calculation . The RTS Index is calculated both in Russian rubles and US dollars. Ruble index is based on the dollar-denominated one, and is considered auxiliary. Index is calculated every time when one of the following events happens to any security-constituent of the Index: a)security is traded in full accordance with the present methodology; b)the best bid price of a security exceeds the last calculated price of the security; c)the best ask price of a security is less than the last calculated price of the security. The RTS Index is computed by dividing the total market capitalization of the Index component securities as of current date by the total market capitalization of the same securities as of initial date multiplied by the Index value as of initial date and the adjusting coefficient. In order to restrict the degree of influence of certain individual securities on Index value, the methodology of Index calculation takes into account the following rule – the share of each security-constituent of the Index in total market capitalization should not exceed 15%. General control and amending the existing methodology should be performed by the RTS Stock Exchange Information Committee.