| Fajna Sp.z o.o. Limited | | Live |
| O.O. Studio International Trading Limited | Private company limited by shares | Dissolved |
| Ooak Limited | Private company limited by shares | Live |
| OOBA LIMITED | Private company limited by shares | Live |
| OOBAI CO., LIMITED | Private company limited by shares | Dissolved |
| OOBE Entertainment Limited | Private company limited by shares | Live |
| OOBIQ Limited | Private company limited by shares | Dissolved |
| Oobleck Limited | | Live |
| OOCA Company Limited | Private company limited by shares | Live |
| OOCL-HASCO SERVICE LIMITED | Private company limited by shares | Dissolved |
| OOCW Limited | Private company limited by shares | Dissolved |
| OoCZ Consulting Limited | | Live |
| OODLES COMPANY LIMITED | Private company limited by shares | Dissolved |
| OODLES LIMITED | Private company limited by shares | Live |
| OODLES HOLDING LIMITED | Private company limited by shares | Live |
| OODLES SYSTEMS LIMITED | Private company limited by shares | Live |
| OODLESS INVESTMENT LIMITED | Private company limited by shares | Dissolved |
| OODWAYS COMPANY LIMITED | Private company limited by shares | Dissolved |
| OODWAYS (INTERNATIONAL) LIMITED | Private company limited by shares | Dissolved |
| OODYS CHINA LIMITED | Private company limited by shares | Dissolved |
| OOEE ENTERPRISE LIMITED | Private company limited by shares | Live |
| OOEOO (CHINA) HOLDINGS LIMITED | Private company limited by shares | Live |
| Oogees Company Limited | Private company limited by shares | Live |
| OOGOG TRADE LIMITED | | Live |
| OOGOO LIMITED | Private company limited by shares | Live |
| OOGST LIMITED | Private company limited by shares | Live |
| Oogway Limited | Private company limited by shares | Live |
| OOHCAR LIMITED | Private company limited by shares | Live |
| Ooherrer Limited | Private company limited by shares | Live |
| Oohoo Buddy Limited | | Live |
| OOHSTAR LIMITED | Private company limited by shares | Dissolved |
| Ooh-Workshop Limited | Private company limited by shares | Live |
| OOII GROUP LIMITED | Private company limited by shares | Live |
| OOJAH Limited | | Live |
| Ookami Consulting Limited | Private company limited by shares | Dissolved |
| OOKEA Group Company Limited | Private company limited by shares | Live |
| OOKII LIMITED | Private company limited by shares | Live |
| OOKK TYRES COMPANY (HK) LIMITED | Private company limited by shares | Live |
| OOKONN Limited | Private company limited by shares | Live |
| OOKURA COMPANY LIMITED | Private company limited by shares | Live |
| Ookura Group Company Limited | Private company limited by shares | Live |
| OOKURA INVESTMENTS LIMITED | Private company limited by shares | Live |
| Ookus International Company Limited | Private company limited by shares | Live |
| OOKY DESIGN LIMITED | Private company limited by shares | Live Commenced dormancy on 21-Jan-2014 |
| Oolaa Group Management Limited | | Live |
| Oolaalaa Company Limited | Private company limited by shares | Live |
| oolab Limited | Private company limited by shares | Live |
| Oolala Limited | Private company limited by shares | Live |
| OOLAND CO., LIMITED | Private company limited by shares | Live |
| OOLANG INTERNATIONAL INVESTMENT GROUP LIMITED | Private company limited by shares | Dissolved |
| OOley Care Company Limited | | Live |
| Oolive Limited | Private company limited by shares | Live |
| OOLLET LIMITED | Private company limited by shares | Live |
| OOLONG TEA LIMITED | | Live |
| Oomgfilm Limited | Private company limited by shares | Live |
| OOMISHIMA HONG KONG LIMITED | Private company limited by shares | Live |
| oomnis Limited | Private company limited by shares | Live |
| Oomol Studio Limited | | Live |
| OOMPH LIMITED | Private company limited by shares | Live |
| Ooms PMB HK Limited | Private company limited by shares | Live |
| OOMTRACO PRATAMA COMPANY LIMITED | Private company limited by shares | Dissolved |
| OONA Limited | Private company limited by shares | Live |
| OONE Limited | Private company limited by shares | Live |
| OONE CREATIVE CO., LIMITED | Private company limited by shares | Live |
| OONE DESIGN LIMITED | Private company limited by shares | Live |
| OONE PROPERTY GROUP LIMITED | Private company limited by shares | Live |
| K. T. OONG & COMPANY LIMITED | Private company limited by shares | Dissolved |
| K.T. OONG & COMPANY LIMITED | Private company limited by shares | Dissolved |
| OONL LIMITED | Private company limited by shares | Live |
| J. OONNY COMPANY LIMITED | Private company limited by shares | Dissolved |
| Ooogo Limited | Private company limited by shares | Live |
| oooh & co. Limited | Private company limited by shares | Live |
| OOOHLALA LIMITED | Private company limited by shares | Live |
| Oookie Cookie Limited | Private company limited by shares | Live |
| Oookini Business Consulting Limited | | Live |
| OOOO Jewellery Company Limited | Private company limited by shares | Live |
| OOO-Planet Limited | | Live |
| OOOPS!WEDDING LIMITED | Private company limited by shares | Dissolved |
| OOOSH LIMITED | Private company limited by shares | Live |
| OOOSH NWT LIMITED | | Live |
| Ooosse Factor Limited | Private company limited by shares | Live |
| OOOSTUDIO LIMITED | | Live |
| OOOTANDEM LIMITED | Private company limited by shares | Live |
| OOPA Limited | Private company limited by shares | Live |
| OOPS LIMITED | Private company limited by shares | Live |
| Oops by Bu Company Limited | Private company limited by shares | Live |
| Oops! Fit Limited | Private company limited by shares | Live |
| Oops Creative Limited | Private company limited by shares | Live |
| U Fitness Oops Limited | Private company limited by shares | Live |
| Oops Investments Company Limited | Private company limited by shares | Live |
| OOPS TOYS LIMITED | Private company limited by shares | Live |
| Oops Typo Limited | Private company limited by shares | Live |
| OOPSBUY LIMITED | Private company limited by shares | Dissolved |
| OOPSIC LIMITED | | Live |
| Oopsie Limited | Private company limited by shares | Live |
| Oopsie Daisy Limited | Private company limited by shares | Live |
| Oopsquare Limited | Private company limited by shares | Live |
| NAIS OOPYA & CO LIMITED | Private company limited by shares | Live |
| OORA Captials Limited | Private company limited by shares | Live |
| Oorari Jewellery Limited | | Live |