Oil, gas and power engineering companies:

OOO Gazprom Transgaz Volgograd 
OOO Gazprom Transgaz Saratov
OOO Gazprom Dobycha Yamburg
PAO Tomskgazprom
AO CKBN (DOAO CKBN Gazprom)
PAO Siburtyumengaz
OOO Lukoil-Komi
OOO Lukoil Western Siberia
OOO  Irkutsk oil company
PAO Novatek
OOO Gazpromneft-Orenburg 
OOO Gazpromneft-Yamal
OOO Gazpromneft-Vostok 
PAO Gazpromneft-NNG
AO Gazpromneft-ONPZ
PAO Tatneft
PAO Bashneft
PAO Orenburgneft
PAO Negusneft
OOO RN-Krasnodarneftegaz
RN-Yuganskneftegaz
RN-Purneftegaz
AO Samotlorneftegaz
OOO Naryanmarneftegaz
AO Nizhnevartovsk oil and gas producing enterprise
AO Caspian pipeline Consortium
Petrochemical complex Uzbekneftegaz
AO KazTransGaz
OOO Yugragazpererabotka
PAO Mosenergo
OOO Nobel-Oil
OOO Stavrolen
OOO Ilsk oil refinery
PAO Sheshmaoil
PAO Tatnefteprodukt
AO Nefteotdacha

Design Institute

AO Giprotruboprovod
ZAO NIPI Institute Injgeo
AO NIPI Institute Spetsnefteproekt;
AO NIIturbokompressor named after V.B. Shnepp;
OAO NIPIgazpererabotka
OOO Samaranipineft
AO Neftekhimproekt
OAO Giprosvyaz-Sankt-Peterburg
OAO Giprotransmost
OOO Insitute Tatvodagroproekt
OOO Insitute Tatvodproekt;
OOO Premium engineering

Industrial enterprises:

PAO Kazanorgsintez;
PAO Nizhnekamskneftekhim;
OOO Tobolsk-polimer;
AO NPK UNIKMASH;
AO GMZ Khimmash;
FGU Volgo-Vyatskupravdor;
PAO HK Tatnefteprodukt;
AO Ferry Watt;
ZAO NPP Kompressor;
AO KMPO;
AO Gidromashservis, OAO Kazankompressormash;
OOO KER-Holding;
OOO Mikrotest;
AO TatNIIneftemash;
OAO Tatnefteprovodstroy;
OOO EkoTEK.