Disclosures of Fact

Disclosures of fact for 3rd quarter 2007

• Increase in Total Assets for 2Q 2007
• Increase in Net Profit for 2Q 2007

Disclosures of fact for 2nd quarter 2006

• Decrease in Net Profit for 4Q 2005

Disclosures of fact for 1st quarter 2006

• Record Date for May 13 EGM
• Board of Directors Calls EGM
• Sibneft-Resurs LLC Established
• Sibneft Acquires St. Petersburg Property Firm
• Sibneft Acquires Slavneft-Kaluga

Disclosures of fact for 4th quarter 2005

• Extraordinary Shareholder Meeting Voting Results
• New Item Added to EGM Agenda
• Changes in Shareholders' Structure
• Gazprom Became a Shareholder of 55.9961% of Shares of Sibneft JSC
• Increase in RAS Net Profit for 3Q 2005
• Change in the List of Sibneft Shareholders
• Gazprom Finance Acquires 72.66% of Sibneft
• Resolutions of the Board of Directors on October 21, 2005
• October 24 Set as Record Date for December 23 EGM
• Sibneft Increases Stake in Sibneftenergo to 100%

Disclosures of fact for 3rd quarter 2005

• Sibneft Sells Stake in Tsenturion-M
• Sibneft Establishes New Production Subsidiary, Sibneft-Vostok
• Annual Shareholder Meeting Voting Results
• Sibneft Shares De-listed from RTS Category B
• Sibneft Acquires Slavneft-Saint Petersburg
• Increase in RAS Net Profit for 2Q 2005
• Board of Directors Sets Rescheduled AGM Agenda
• Record Date for Rescheduled Annual Shareholders Meeting
• Change in Share Ownership
• June 30 Board of Directors Decisions (Dividends, Chairman)

Disclosures of fact for 2nd quarter 2005

• Sibneft-Yaroslavlnefteproduct Founded
• Board of Directors Sets AGM Agenda
• Record Date for Annual Shareholders Meeting
• Board of Directors Calls Annual Shareholders Meeting

Disclosures of fact for 1st quarter 2005

• Change in Equity Stake in Sibneftenergo
• Sibneft-Khantos LLC Established
• Sibneft Oil Trade Gmbh Established