| OCTO LIMITED | | Live |
| OCTO GEN LIMITED | | Live |
| Octo Advisory Limited | Private company limited by shares | Live |
| OCTO ANNOS BUSINESS CONSULTANCY LIMITED | | Live |
| OCTO MET HK CO., LIMITED | Private company limited by shares | Live |
| OCTO CONSULENS LIMITED | Private company limited by shares | Dissolved |
| OCTO ENERGY LIMITED | Private company limited by shares | Live |
| OCTO ENGINEERING & INDUSTRIAL SUPPLY LIMITED | Private company limited by shares | Live |
| Octo Gambol Limited | Private company limited by shares | Live |
| Octo Group Limited | Private company limited by shares | Live |
| OCTO (HK) LIMITED | Private company limited by shares | Live |
| OCTO ASIA HONG KONG LIMITED | Private company limited by shares | Live |
| OCTO CAPITAL HONG KONG LIMITED | Private company limited by shares | Live |
| OCTO INTERNATIONAL LIMITED | Private company limited by shares | Dissolved |
| OCTO INVESTMENTS LIMITED | Private company limited by shares | Dissolved |
| OCTO JEWELLERY MANUFACTURER LIMITED | Private company limited by shares | Dissolved |
| OCTO LINK LIMITED | Private company limited by shares | Dissolved |
| Octo Rivers Asset Management (HK) Limited | Private company limited by shares | Live |
| Octo Mare Company Limited | Private company limited by shares | Live |
| OCTO OFFICE FURNITURE COMPANY LIMITED | Private company limited by shares | Live |
| OCTO PROPERTY LIMITED | Private company limited by shares | Live |
| OCTO RUILIAN (H.K) LIMITED | Private company limited by shares | Dissolved |
| OCTO SOLUTIONS LIMITED | Private company limited by shares | Live |
| OCTO SUPPLY LIMITED | Private company limited by shares | Live |
| Octo Technology Co., Limited | Private company limited by shares | Live |
| OCTO TRADING LIMITED | Private company limited by shares | Live |
| OCTO Trading Company Limited | Private company limited by shares | Live |
| OCTO VAULT LIMITED | | Live |
| OCTO3 LIMITED | Private company limited by shares | Live |
| OCTO3 TECHNOLOGY LIMITED | Private company limited by shares | Live |
| OCTO3 Transaction Hub Limited | Private company limited by shares | Live |
| OCTOBA COMMUNICATIONS COMPANY LIMITED | Private company limited by shares | Live |
| OCTOBA INVESTMENT LIMITED | Private company limited by shares | Dissolved |
| OctoBabel Limited | Private company limited by shares | Live |
| OCTOBASE LIMITED | Private company limited by shares | Dissolved |
| OCTOBER LIMITED | Private company limited by shares | Dissolved |
| OCTOBER LIMITED | Private company limited by shares | Live |
| OCTOBER 1 LIMITED | Private company limited by shares | Live |
| 1st October Company Limited | Private company limited by shares | Dissolved |
| October XI Limited | Private company limited by shares | Live |
| OCTOBER 1 APM LIMITED | Private company limited by shares | Live |
| October Company Limited | Private company limited by shares | Live |
| OCTOBER DESIGN LIMITED | Private company limited by shares | Live |
| October Faces Limited | Private company limited by shares | Live |
| October First Limited | Private company limited by shares | Live |
| OCTOBER CREATIVE GROUP LIMITED | Private company limited by shares | Live |
| October Investments Limited | Private company limited by shares | Dissolved |
| October Art Jewellery Company Limited | | Live |
| October Plus Limited | Private company limited by shares | Live |
| OCTOBER SOLUTIONS LIMITED | Private company limited by shares | Dissolved |
| OCTOBER STUDIO LIMITED | Private company limited by shares | Dissolved |
| OCTOBER TRADING COMPANY LIMITED | Private company limited by shares | Dissolved |
| One October Trading Company Limited | | Live |
| October4 HK Limited | Private company limited by shares | Live |
| October4 Equipment HK Limited | Private company limited by shares | Live |
| October68 Limited | Private company limited by shares | Live |
| OctoberEighteen Co. Limited | Private company limited by shares | Live |
| OCTOBERFLOWER LIMITED | Private company limited by shares | Dissolved |
| OctoberHM LIMITED | | Live |
| OCTOBOTICS LIMITED | Private company limited by shares | Live |
| OCTOCA LIMITED | Private company limited by shares | Dissolved |
| Octocell Limited | Private company limited by shares | Live |
| OCTOCITY COMPANY LIMITED | Private company limited by shares | Dissolved |
| OCTO-COMMERCE COMPANY LIMITED | Private company limited by shares | Live |
| OctoEMarket Limited | | Live |
| OCTOGETHER STUDIO COMPANY LIMITED | Private company limited by shares | Live |
| OCTOGIN COMPANY LIMITED | Private company limited by shares | Dissolved |
| OCTOLEPTICS LIMITED | Private company limited by shares | Dissolved |
| OCTOLINK (HONG KONG) LIMITED | Private company limited by shares | Live |
| OCTOLINK MOBITRONICS LIMITED | Private company limited by shares | Live |
| OCTOLINK TECHNOLOGY (HONGKONG) COMPANY LIMITED | Private company limited by shares | Live |
| Octomarine HK Limited | Private company limited by shares | Dissolved |
| OctoMedia Limited | | Live |
| OCTOMEN COMPANY LIMITED | Private company limited by shares | Dissolved |
| Octominer Limited | Private company limited by shares | Live |
| Octomix Software Technology Limited | Private company limited by shares | Live |
| OCTOMORPHICS LIMITED | Private company limited by shares | Dissolved |
| OCTONET LIMITED | Private company limited by shares | Dissolved |
| Octopals Limited | Private company limited by shares | Live |
| OCTOPARK LIMITED | Private company limited by shares | Dissolved |
| Octopartes Limited | Private company limited by shares | Live |
| Octopath Limited | | Live |
| Grand Octopath Capital Limited | Private company limited by shares | Live |
| OCTOPEX LIMITED | Private company limited by shares | Dissolved |
| HK OCTOPIA TECH LIMITED | | Live |
| Octoplus Limited | Private company limited by shares | Live |
| Octoplus Electronic Commerce Co., Limited | Private company limited by shares | Live |
| OctoPlus Media Global Limited | Private company limited by shares | Live |
| Octoplus Technology Limited | Private company limited by shares | Live |
| Octopolux Limited | Private company limited by shares | Dissolved |
| OCTO-POLY COMPANY LIMITED | Private company limited by shares | Live |
| OCTOPONT LIMITED | Private company limited by shares | Dissolved |
| Octoprex HK Limited | | Live |
| OCTO-PRINT COMPANY LIMITED | Private company limited by shares | Dissolved |
| OCTOPULLS TECH LIMITED | Private company limited by shares | Live |
| OCTOPUS COMPANY LIMITED | Private company limited by shares | Live |
| OCTOPUS PUB LIMITED | Private company limited by shares | Dissolved |
| OCTOPUS INC CO. LIMITED | Private company limited by shares | Live |
| OCTOPUS ME LIMITED | Private company limited by shares | Live |
| Octopus Company Limited | Private company limited by shares | Live |