“Rosneft Oil Company” OJSC
“Surgutneftegaz” OJSC
TNK-BP OJSC
“Tatneft” Management of “Tatneftesnab” OJSC
“The Orenburg chisel company” OJSC
“The first national company” JSC
“The Siberian service company” JSC
“Gazprom Neft” OJSC
“Kaspiy Neft” SC
“KomyNefteGaz”
“The chisel company “Evraziya” OC
“Bashneft” ANK
“KazTatMunay” OC
“Turkmenneft” GK
“Turkmengaz”