High Quality Content by WIKIPEDIA articles! TNK-BP is a major vertically integrated Russian oil company headquartered in Moscow. It is Russia`s third-largest oil producer and among the ten largest private oil companies in the world. TNK-BP is Russia`s third largest oil company in terms of reserves and crude oil production. It is 50% owned by BP and 50% by a group of Russian businessmen, represented by the AAR (Alfa-Access-Renova) consortium.