Joint-Stock Financial Corporation Sistema

Medsi Group of Companies to announce financial results

September 2, 2010
The Medsi Group of Companies, a leading national provider of medical and healthcare services in Moscow and other regions, is to announce unaudited consolidated financial results for the second quarter of 2010 – its first such accounts to be published – on September 7, 2010.

Mobile TeleSystems Announces Financial Results for the Second Quarter Ended June 30, 2010

August 26, 2010
Moscow, Russia – August 26, 2010 – Mobile TeleSystems OJSC (“MTS” - NYSE: MBT), the leading telecommunications provider in Russia and the CIS, today announces its unaudited US GAAP financial results for the three months ended June 30, 2010.

Comstar — United Telesystems OJSC financial results for the second quarter and first six months of 2010

August 25, 2010
Moscow, Russia – August 25, 2010 – “COMSTAR – United TeleSystems” OJSC (“Comstar” or “the Group”) (LSE: CMST), the largest integrated telecommunications provider in Moscow and 83 Russian cities, today announced its unaudited consolidated US GAAP financial results for the second quarter and the six months ended June 30, 2010.

AD HOC NOTICE

August 19, 2010
Moscow, Russia – August 19, 2010 – Sistema (“The Company”) (LSE: SSA), the largest diversified public financial corporation in Russia and the CIS, which invests in and is a major shareholder of companies operating in different industries, notes articles dated August 19, 2010 in the Russian press referring to the commencement of a merger between Bashneft and Russneft, plans to effect changes in the management of Bashneft and the management of Sistema’s “Oil and Energy Group” Business Unit, and the Company’s dissatisfaction with the development of the Bashneft assets and the potential transfer of the management of these assets to Mikhail Gutseriev.

While the Company generally does not comment on market rumours, in this instance the Company wishes to clarify that these reported matters do not reflect the facts or the position of Sistema’s management.