| OMNICOATINGS LIMITED | | Live |
| OMNI-COM LIMITED | Private company limited by shares | Dissolved |
| OMNICOM LIMITED | Private company limited by shares | Live |
| OMNICOM ENGINEERING LIMITED | Private company limited by shares | Live |
| OMNICOM MEDIA GROUP GREATER CHINA LIMITED | Private company limited by shares | Live |
| OMNICOM INTERNATIONAL LIMITED | Private company limited by shares | Dissolved |
| Omnicom Asia Pacific Limited | Private company limited by shares | Live |
| OmniCom Electrical Works Limited | | Live |
| Omnicon Limited | Private company limited by shares | Live |
| OMNICON INDUSTRY CO., LIMITED | Private company limited by shares | Live |
| OMNICON ENGINEERING LIMITED | Private company limited by shares | Dissolved |
| OMNICON EVENTS LIMITED | Private company limited by shares | Live |
| OMNICON FREIGHT MANAGEMENT LIMITED | Private company limited by shares | Dissolved |
| OMNICORP ASIA LIMITED | Private company limited by shares | Dissolved |
| OMNICOURT LIMITED | Private company limited by shares | Dissolved |