| Name | Country | Region | Address |
|---|---|---|---|
| "Onon" | Russia | Zabaikalsky region | |
| "OOO "Evrostar" g. Moskva | Russia | Moscow | g. Moskva |
| "OOO Kuznyetskiy privoz" | Russia | Кемеровская область | g. Novokuznyetsk |
| "OPKh Solyanskoe" | Russia | Krasnoyarsk region | 663953 Rybinsky r-on, s. Novaya Solyanka, ul. Pervomayskaya, 23 |
| "Opytnaya stanciya "Novotalickoe" | Russia | Altai region | |
| "Orenburgregiongaz" | Russia | ||
| "Orlovo" MOZO | Russia | ||
| "Oros" Stud | Russia | Krasnodar Region | |
| "Otel "YaR", g. Voronezh | Russia | ul. Taranchenko, d.31, kv.17; 394036 | |
| "Ozerki" | Russia | Ulyanovsk region | Uljanowsk, Cherdaklinsk |