| 6451 | ORTA | 1 |
| 6452 | ОСА | 1 |
| 6453 | OscarLab | 1 |
| 6454 | osclass-pro | 1 |
| 6455 | Ошка | 1 |
| 6456 | Осинцев | 1 |
| 6457 | Osk-Market | 1 |
| 6458 | OSMI IT (Ex Осьминожка) | 1 |
| 6459 | Otherwise | 1 |
| 6460 | "Отклик" | 1 |
| 6461 | Открытые ресурсы (г. Киев) | 1 |
| 6462 | ОТМ Россия | 1 |
| 6463 | оура | 1 |
| 6464 | OUT.AGENCY | 1 |
| 6465 | Outreach BRO | 1 |
| 6466 | OVERCLICK | 1 |
| 6467 | OWL agency | 1 |
| 6468 | OWL Agency | 1 |
| 6469 | Oxiv.ru | 1 |
| 6470 | OXY-marketing | 1 |
| 6471 | Oy-li Digital | 1 |
| 6472 | Ozhgibesov.net | 1 |
| 6473 | OZ INTERACTIVE | 1 |
| 6474 | PageFactory | 1 |
| 6475 | PageLab | 1 |
| 6476 | Palex Web | 1 |
| 6477 | Pallada Pro | 1 |
| 6478 | PANAU | 1 |
| 6479 | Panda Ads | 1 |
| 6480 | PANDA Digital Group | 1 |
| 6481 | Panda Moscow | 1 |
| 6482 | Panda-Seo | 1 |
| 6483 | Panda Style | 1 |
| 6484 | Пандаворкс | 1 |
| 6485 | Pandora Research | 1 |
| 6486 | Панеглиф | 1 |
| 6487 | Papaton | 1 |
| 6488 | Папин сайт | 1 |
| 6489 | PARACVET | 1 |
| 6490 | PARAPIX — web & creative agency | 1 |
| 6491 | Parma | 1 |
| 6492 | Parsley Digital | 1 |
| 6493 | PARUS DIGITAL AGENCY | 1 |
| 6494 | [PASHN] | 1 |
| 6495 | Patrol Studio | 1 |
| 6496 | Patron | 1 |
| 6497 | Pattern | 1 |
| 6498 | Pattern Communication Agency | 1 |
| 6499 | Pautino | 1 |
| 6500 | Pavlenko IT-компания | 1 |
