Arktikmorneftegazrazvedka

Arktos Petroleum

Aron Energy

Asab Oil

Asinoneftesklad

Aspo Energy

Ast-Munai Petroleum

Astran

Atayneft

Atlant-Neftegaz

Aurelian Oil and Gas

Avangard-Oil 1

Avion

Avt Nefto-Servis

Ayaks-Petrolium

Azmy Group

Azovtranzit

Azs Aktan

Arktikneft

Arlan Neftegaz

Arsknefteprodukt

Asia Neft Torg

Aspara Refinery

Assa Oil

Astakhovsky

Atasu Refinery

Atica North America

Atyrau Refinery

Avangard-Oil

Aviamashenergy

Avro-Neftegaz

Ay-Kurussky

Az Petroleum

Aznaevneft

Azro Oil

Azs Plus