| Name | Country | Region | Address |
|---|---|---|---|
| "Nurlatsky konny zavod" | Russia | Tatarstan | Nurlatsky r-n, g. Nurlat, ul. Sovetskaya, d 130, ofis 19 |
| "Olimpiya" | Russia | Orenburg region | Orenburgskaya obl., g. Novotroitsk |
| "Olzava" | Russia | Moldova | |
| "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 |