| 6401 | Ошка | 1 |
| 6402 | Осьминожка | 1 |
| 6403 | Осинцев | 1 |
| 6404 | Osk-Market | 1 |
| 6405 | Otherwise | 1 |
| 6406 | "Отклик" | 1 |
| 6407 | Открытые ресурсы (г. Киев) | 1 |
| 6408 | ОТМ Россия | 1 |
| 6409 | оура | 1 |
| 6410 | OUT.AGENCY | 1 |
| 6411 | Outreach BRO | 1 |
| 6412 | OVERCLICK | 1 |
| 6413 | OWL Agency | 1 |
| 6414 | OWL agency | 1 |
| 6415 | Oxiv.ru | 1 |
| 6416 | OXY-marketing | 1 |
| 6417 | Oy-li Digital | 1 |
| 6418 | Ozhgibesov.net | 1 |
| 6419 | OZ INTERACTIVE | 1 |
| 6420 | PageFactory | 1 |
| 6421 | PageLab | 1 |
| 6422 | Palex Web | 1 |
| 6423 | Pallada Pro | 1 |
| 6424 | PANAU | 1 |
| 6425 | Panda Ads | 1 |
| 6426 | PANDA Digital Group | 1 |
| 6427 | Panda Moscow | 1 |
| 6428 | Panda-Seo | 1 |
| 6429 | Panda Style | 1 |
| 6430 | Пандаворкс | 1 |
| 6431 | Pandora Research | 1 |
| 6432 | Панеглиф | 1 |
| 6433 | Papaton | 1 |
| 6434 | Папин сайт | 1 |
| 6435 | PARACVET | 1 |
| 6436 | PARAPIX — web & creative agency | 1 |
| 6437 | PARUS DIGITAL AGENCY | 1 |
| 6438 | [PASHN] | 1 |
| 6439 | Patrol Studio | 1 |
| 6440 | Patron | 1 |
| 6441 | Pattern | 1 |
| 6442 | Pattern Communication Agency | 1 |
| 6443 | Pautino | 1 |
| 6444 | Payresult | 1 |
| 6445 | PBB-design | 1 |
| 6446 | PDM agency | 1 |
| 6447 | Pen&Brain | 1 |
| 6448 | Penguin-team | 1 |
| 6449 | Peretz Agency | 1 |
| 6450 | PERF AGENCY | 1 |
