| 6751 | OpencartDev | 1 |
| 6752 | OpenCart.Site | 1 |
| 6753 | Optify | 1 |
| 6754 | OptimalGroup | 1 |
| 6755 | Optimax | 1 |
| 6756 | ОПТИМИЗАТОР | 1 |
| 6757 | OPTIMO | 1 |
| 6758 | Optipromo | 1 |
| 6759 | Orange | 1 |
| 6760 | Orange Process | 1 |
| 6761 | ОрбитСофт | 1 |
| 6762 | OrbitSoft | 1 |
| 6763 | Orchid Studio | 1 |
| 6764 | Origami | 1 |
| 6765 | Origin | 1 |
| 6766 | Original Group | 1 |
| 6767 | Orlime Digital | 1 |
| 6768 | ORTA | 1 |
| 6769 | ОСА | 1 |
| 6770 | OscarLab | 1 |
| 6771 | osclass-pro | 1 |
| 6772 | Осинцев | 1 |
| 6773 | Osk-Market | 1 |
| 6774 | Otherwise | 1 |
| 6775 | "Отклик" | 1 |
| 6776 | Открытые ресурсы (г. Киев) | 1 |
| 6777 | ОТМ Россия | 1 |
| 6778 | оура | 1 |
| 6779 | OUT.AGENCY | 1 |
| 6780 | Outlines Tech | 1 |
| 6781 | Outreach BRO | 1 |
| 6782 | OVERCLICK | 1 |
| 6783 | OWL Agency | 1 |
| 6784 | OWL agency | 1 |
| 6785 | Oxiv.ru | 1 |
| 6786 | OXY-marketing | 1 |
| 6787 | Oy-li Digital | 1 |
| 6788 | Ozhgibesov.net | 1 |
| 6789 | OZ INTERACTIVE | 1 |
| 6790 | PageFactory | 1 |
| 6791 | PageLab | 1 |
| 6792 | Palex Web | 1 |
| 6793 | Pallada Pro | 1 |
| 6794 | PANAU | 1 |
| 6795 | PANDA Digital Group | 1 |
| 6796 | Panda Moscow | 1 |
| 6797 | Panda-Seo | 1 |
| 6798 | Panda Style | 1 |
| 6799 | Пандаворкс | 1 |
| 6800 | Pandora Research | 1 |
