Moscow, Russia– September 21, 2005 – Sistema (LSE: SSA), the largest private sector consumer services company in Russia and the CIS, announced today that the ordinary shares of Comstar United TeleSystems, its fixed-line telecommunications provider subsidiary, were admitted to the Moscow Stock Exchange (MSE) under the symbol CMST and will start trading tomorrow, September 22.

The admission to trading comes after the Russian Federal Service for Financial Markets registered the share prospectus of Comstar UTS, which recently changed its legal status of closed joint stock company ZAO Comstar to open joint stock company OAO Comstar UTS.