High Quality Content by WIKIPEDIA articles! Vostok Gas Ltd (named Vostok Nafta Investment Ltd prior to 24 May 2007) is an investment company mainly focused on oil and gas from the former Soviet Union. The company was founded in 1996 and has its headquarters in Bermuda. Almost all Vostok Gas`s holdings are American Depositary Receipts (ADRs) in Russia`s Gazprom, which makes the company owner of approximately 1.5% of Gazprom. The company is listed on the Stockholm Stock Exchange and was a member of the OMX Stockholm 30 index between July 2006 and January 2009.