| ONSUN INVESTMENT LIMITED | Private company limited by shares | Live |
| Onsun Investments Limited | Private company limited by shares | Dissolved |
| ONSUN MANAGEMENT LIMITED | Private company limited by shares | Live |
| ONSUN MANUFACTURING COMPANY LIMITED | Private company limited by shares | Dissolved |
| ONSUN PROPERTIES LIMITED | Private company limited by shares | Dissolved |
| ONSUN TRADING LIMITED | Private company limited by shares | Dissolved |
| ONSUN TRADING LIMITED | Private company limited by shares | Dissolved |
| ONSURE LIMITED | Private company limited by shares | Dissolved |
| ONSWAY HOPE FINANCE COMPANY LIMITED | Private company limited by shares | Dissolved |
| ONSWELL INTERNATIONAL LIMITED | Private company limited by shares | Dissolved |
| ONSWICK LIMITED | Private company limited by shares | Dissolved |
| ONSWIN COMPANY LIMITED | Private company limited by shares | Dissolved |
| ONSYNC LIMITED | Private company limited by shares | Live |
| AIGOTECH ONSYNK LIMITED | Private company limited by shares | Live |
| on-T3-line Limited | Private company limited by shares | Live |
| ONTA LIMITED | Private company limited by shares | Dissolved |
| ONTACT LIMITED | Private company limited by shares | Live |
| Ontact Asia Limited | Private company limited by shares | Live |
| ONTACT PROTOCOL LIMITED | Private company limited by shares | Live |
| ONTAI LIMITED | Private company limited by shares | Dissolved |
| ONTAK LIMITED | Private company limited by shares | Dissolved |
| ONTAK LIMITED | Private company limited by shares | Live |
| ONTAK INVESTMENT LIMITED | Private company limited by shares | Dissolved |
| ONTAL COMPANY LIMITED | Private company limited by shares | Dissolved |
| ONTAL DESIGN LIMITED | Private company limited by shares | Dissolved |
| ONTALENT LIMITED | Private company limited by shares | Dissolved |
| Ontandra Limited | Private company limited by shares | Live |
| ONTANK INVESTMENTS AND FINANCE LIMITED | Private company limited by shares | Dissolved |
| ONTAR LIMITED | Private company limited by shares | Live |
| ONTARGET LIMITED | Private company limited by shares | Live |
| On-Target Advertising Limited | | Live |
| ONTARGET ASIA LIMITED | Private company limited by shares | Dissolved |
| ONTARIO LIMITED | Private company limited by shares | Dissolved |
| ONTARIO COMPANY LIMITED | | Live |
| NO. 505746 ONTARIO (HK) LIMITED | Private company limited by shares | Dissolved |
| Ontario eSchool Asia Limited | Private company limited by shares | Live |
| ONTARIO CENTURY ENTERPRISE LIMITED | Private company limited by shares | Dissolved |
| ONTARIO ENTERPRISES LIMITED | Private company limited by shares | Dissolved |
| ONTARIO FINANCE LIMITED | Private company limited by shares | Live |
| ONTARIO FINANCE AND INVESTMENT COMPANY, LIMITED | Private company limited by shares | Dissolved |
| ONTARIO INVESTMENT LIMITED | Private company limited by shares | Dissolved |
| LAKE ONTARIO LIMITED | Private company limited by shares | Live |
| PORT ONTARIO LIMITED | Private company limited by shares | Dissolved |
| Talent Ontario Limited | | Live |
| ONTARIO TECHNOLOGY LIMITED | Private company limited by shares | Dissolved |
| ONTARIO-CENTURY COMPANY LIMITED | Private company limited by shares | Dissolved |
| ONTARKEE COMPANY LIMITED | Private company limited by shares | Dissolved |
| ONTARY COMPANY LIMITED | Private company limited by shares | Dissolved |
| ONTASK LIMITED | Private company limited by shares | Live |
| ONTAT ASIA LIMITED | Private company limited by shares | Dissolved |
| ON.TA.U. Limited | Private company limited by shares | Live |
| ONTEAM COMPANY LIMITED | Private company limited by shares | Dissolved |
| ONTEAM LIMITED | Private company limited by shares | Dissolved |
| ONTEC LIMITED | Private company limited by shares | Dissolved |
| ONTEC LIMITED | Private company limited by shares | Live |
| ONTEC CONSTRUCTION & ENGINEERING LIMITED | Private company limited by shares | Live |
| ONTEC INTERNATIONAL LIMITED | Private company limited by shares | Live |
| ONTEC INVESTMENT LIMITED | Private company limited by shares | Live |
| ONTEC TOWING LIMITED | Private company limited by shares | Dissolved |
| Asia Ontech Advisory Limited | Private company limited by shares | Live |
| ONTECH DIE CASTING COMPANY LIMITED | Private company limited by shares | Dissolved |
| ONTECH CO., LIMITED | Private company limited by shares | Live |
| ONTECH CONSULTANTS LIMITED | Private company limited by shares | Dissolved |
| ONTECH CORPORATION LIMITED | Private company limited by shares | Live |
| ONTECH FAR EAST LIMITED | Private company limited by shares | Live |
| ONTECH ELECTRONIC (HK) LIMITED | Private company limited by shares | Dissolved |
| ONTECH ELECTRONICS INTERNATIONAL LIMITED | Private company limited by shares | Live |
| ONTECH PLASTICS ELECTRONICS CO., LIMITED | Private company limited by shares | Live |
| ON-TECH ENGINEERING LIMITED | Private company limited by shares | Dissolved |
| ONTECH EQUIPMENT ENGINEERING LIMITED | Private company limited by shares | Live |
| ONTECH ENTERPRISES LIMITED | Private company limited by shares | Live |
| ONTECH FINANCE LIMITED | Private company limited by shares | Live |
| ON-TECH (GLOBAL) LIMITED | | Live |
| ON-TECH (H.K.) LIMITED | Private company limited by shares | Live |
| HONG KONG ONTECH ELECTRONICS CO., LIMITED | Private company limited by shares | Dissolved |
| ONTECH TECHNOLOGY (HONG KONG) COMPANY LIMITED | Private company limited by shares | Dissolved |
| ONTECH INDUSTRIAL LIMITED | Private company limited by shares | Live |
| ONTECH INTERNATIONAL INDUSTRIAL LIMITED | Private company limited by shares | Dissolved |
| Ontech Precision Industry (HK) Limited | Private company limited by shares | Live |
| ONTECH INTERNATIONAL LIMITED | Private company limited by shares | Dissolved |
| ONTECH INVESTMENT LIMITED | Private company limited by shares | Dissolved |
| ONTECH INTERNATIONAL SHIPPING LIMITED | Private company limited by shares | Dissolved |
| ONTECH SUPREME ENGINEERING LIMITED | Private company limited by shares | Live |
| Ontech Technology Co., Limited | Private company limited by shares | Live |
| ONTECH (HK) TECHNOLOGY LIMITED | Private company limited by shares | Live |
| ONTECH INTERNATIONAL TECHNOLOGY LIMITED | Private company limited by shares | Dissolved |
| ONTECH TRADING LIMITED | Private company limited by shares | Live |
| OnTeck Limited | Private company limited by shares | Live |
| OnTeck Group Limited | Private company limited by shares | Live |
| ONTEGOS LIMITED | Private company limited by shares | Live |
| ONTEIC LIMITED | Private company limited by shares | Dissolved |
| ON-TEK COMPANY LIMITED | Private company limited by shares | Dissolved |
| ONTELE COMPANY LIMITED | Private company limited by shares | Dissolved |
| ONTELE COMPANY LIMITED | Private company limited by shares | Dissolved |
| ON-TEN LIMITED | Private company limited by shares | Live |
| ONTERRACE LIMITED | Private company limited by shares | Dissolved |
| ONTERY LIMITED | Private company limited by shares | Dissolved |
| ONTEX LIMITED | Private company limited by shares | Dissolved |
| ONTEX LIMITED | Private company limited by shares | Dissolved |
| ONTEX ENTERPRISES LIMITED | Private company limited by shares | Live |