- OAO "Dorogobuzhkotlomash"
| Rusia | - Obedinenie Progress, ZAO
| Rusia | - Obninsky molochny zavod, OAO
| Rusia | - Oboronhim, PO
| Rusia | - Oboznik, ZAO
| Rusia | - Obuvnoe predpriyatie "Nevel", OOO
| Rusia | - Ochakovsky zavod ZHBK GAO "Mosmetrostroy", ZAO
| Rusia | - Ochersky mashinostroitelny zavod, OAO
| Rusia | - Odincovskaya konditerskaya fabrika, OOO
| Rusia | - Odincovsky lakokrasochny zavod, OAO
| Rusia | - Ohtinsky zavod poroshkovyh krasok
| Rusia | - Okna Koloron, OOO
| Rusia | - OKNA-PLYUS, OOO
| Rusia | - OKS 01, ZAO
| Rusia | - Oktava, OAO
| Rusia | - Oleokam, PF
| Rusia | - OLIMP IMPERIAL, OOO
| Rusia | - Olivesta (Moskovsky zavod "Lakokraska") , AOZT
| Rusia | - Olkom, ZAO
| Rusia | - Omsktransmash, GUP
| Rusia | - Oniks-3, ZAO
| Rusia | - OOO "PKF Galreahim"
| Rusia | - Optima - teks, ZAO
| Rusia | - Opytno-eksperimentalny zavod zhelezobetonnyh konstrukcy
| Rusia | - OPYTNOE-stroysertifikaciya
| Rusia | - Opytny elektromontazhny zavod, OAO
| Ukrania | - Opytny mehanichesky zavod, filial AOZT "Mezhgorsvyazstroy"
| Rusia | - Opytny mehanichesky zavod, OAO
| Rusia | - Opytny zavod suhih smesey, AOOT
| Rusia | - Opytny zavod, AOOT
| Rusia | - Orel - Pogruzchik, JSC
| Rusia | - Orelpishemash PKC , OOO
| Rusia | - Orelstroymash, OAO
| Rusia | - Orenstein & Koppel, AG
| Alemania | - Oreshkinsky kombinat nerudnyh stroitelnyh materialov, OOO
| Rusia | - Orgenergogaz, DOAO
| Rusia | - Orgstroy, OOO
| Rusia | - Orgstroyekspert
| Rusia | - Orgstroysertifikaciya
| Rusia | - Orgtehstroy-1, ZAO
| Rusia | - Orion, NTC
| Rusia | - ORLEX, ZAO
| Rusia | - Orlovsky zavod "Steklomash", OAO
| Rusia | - Orlovsky zavod dorozhnyh mashin, OAO
| Rusia | - Orshaagroprommash, OAO
| Belarús | - OSKBES MAI
| Rusia | - OST-ALKO, OOO.
| Rusia | - Ostrovsky zavod elektricheskih mashin, OAO
| Rusia | - Otopitelnyh priborov
| Rusia | - OVESI Administracii Ryazanskoy oblasti
| Rusia | - OZTP-Sarmat, OAO
| Rusia |
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