| Orso Asia Co., Limited | Private company limited by shares | Live |
| Global ORSO Limited | Private company limited by shares | Live |
| orso International Limited | | Live |
| ORSO INVESTMENTS LIMITED | Private company limited by shares | Dissolved |
| ORSOS Island Asia Limited | Private company limited by shares | Live |
| UK ORSTER (INTERNATIONAL) PETROLEUM GROUP LIMITED | Private company limited by shares | Live |
| ORSUM LIMITED | Private company limited by shares | Live |
| OR-SUN Times Company Limited | Private company limited by shares | Live |
| NOVA ORTA LIMITED | Private company limited by shares | Dissolved |
| ORTALIS RESOURCES INVESTMENT CO., LIMITED | Private company limited by shares | Live |
| ORTANIQUE LIMITED | Private company limited by shares | Live |
| Ortax Shipping Co. Limited | Private company limited by shares | Dissolved |
| ORTCOM LIMITED | Private company limited by shares | Live |
| Orte Limited | Private company limited by shares | Live |
| ORTE QUALITY ENGINEERING COMPANY LIMITED | Private company limited by shares | Live |
| Ortec Finance Asia Limited | Private company limited by shares | Live |
| ORTEDAHON TECHNOLOGY LIMITED | Private company limited by shares | Dissolved |
| Ortega Limited | Private company limited by shares | Live |
| Ortega Capital Limited | Private company limited by shares | Dissolved |
| ORTEGA CONTROL (CHINA) CO., LIMITED | Private company limited by shares | Live |
| ORTEGA REALTY AND DEVELOPMENT CORPORATION (HK) LIMITED | Private company limited by shares | Dissolved |
| ORTEGA GROUP HONGKONG LIMITED | Private company limited by shares | Live |
| HONGKONG ORTEGA INTERNATIONAL COMPANY LIMITED | Private company limited by shares | Live |
| Ortega Invest Limited | Private company limited by shares | Dissolved |
| ORTEGA TENNIS LIMITED | Private company limited by shares | Live |
| ORTELLI LIMITED | Private company limited by shares | Dissolved |
| ORTEN TRADING LIMITED | Private company limited by shares | Live |
| ORTES LIMITED | Private company limited by shares | Live |
| ORTEX LIMITED | Private company limited by shares | Dissolved |
| WOC Walter Orthaber Limited | Private company limited by shares | Live |
| ORTHMED (HONGKONG) LIMITED | Private company limited by shares | Dissolved |
| ORTHMED (HONG KONG) MEDICAL INSTRUMENT CO. LIMITED | Private company limited by shares | Live |
| ORTHO LIMITED | Private company limited by shares | Dissolved |
| JOY ORTHO COMPANY LIMITED | Private company limited by shares | Live |
| APOGEE ORTHO LIMITED | Private company limited by shares | Live |
| ORTHO DEV ASIA LIMITED | Private company limited by shares | Live |
| ORTHO BHLR HD LIMITED | Private company limited by shares | Live |
| ZS ORTHO SOLUTION CO., LIMITED | Private company limited by shares | Live |
| Silver Ortho Limited | Private company limited by shares | Live |
| OrthoAdvance Limited | | Live |
| ORTHO-CARE COMPANY LIMITED | Private company limited by shares | Dissolved |
| OrthoCare Co., Limited | Private company limited by shares | Live |
| ORTHOCARE DENTAL CENTRE LIMITED | Private company limited by shares | Live |
| General OrthoCare (HK) Limited | Private company limited by shares | Live |
| OrthoCare Medical Limited | Private company limited by shares | Live |
| OrthoCentre Limited | Private company limited by shares | Live |
| OrthoCentre Holdings Limited | Private company limited by shares | Live |
| OrthoCentre Tuen Mun Limited | Private company limited by shares | Dissolved |
| The Orthocorp Limited | | Live |
| ORTHO-DEAL COMPANY LIMITED | Private company limited by shares | Dissolved |
| ORTHO-DEAL STRATEGIC INVESTMENT LIMITED | Private company limited by shares | Dissolved |
| PULCHRA ORTHODONTIA LIMITED | Private company limited by shares | Live |
| ORTHODONTIC CENTER LIMITED -THE- | Private company limited by shares | Live |
| COOKIEPLAN ORTHODONTIC CONSULTANCY LIMITED | Private company limited by shares | Live |
| GRACE ORTHODONTIC CENTRE LIMITED | Private company limited by shares | Live |
| KOWLOON ORTHODONTIC CENTRE LIMITED | Private company limited by shares | Live |
| PACIFIC ORTHODONTIC CARE LIMITED | Private company limited by shares | Live |
| CD ORTHODONTICS LIMITED | Private company limited by shares | Live |
| CENTRAL ORTHODONTICS LIMITED | Private company limited by shares | Live |
| INTERNATIONAL ASSOCIATION FOR ORTHODONTICS HONG KONG STUDY CLUB LIMITED | Company limited by guarantee | Dissolved |
| HONG KONG ASSOCIATION OF ALIGNER ORTHODONTICS LIMITED | Private company limited by shares | Live |
| Orthodontics Asia (Hong Kong) Limited | Private company limited by shares | Live |
| PACIFIC ORTHODONTICS LIMITED | Private company limited by shares | Dissolved |
| TaSK Orthodontics Limited | Private company limited by shares | Live |
| Orthodox Limited | Private company limited by shares | Live |
| ORTHODOX BROTHERHOOD OF APOSTLES SAINTS PETER AND PAUL LIMITED -THE- | Company limited by guarantee | Live |
| ORTHOLITE GROUP LIMITED | Private company limited by shares | Live |
| Ortholite YA Group Limited | Private company limited by shares | Live |
| ORTHOMOVE LIMITED | Private company limited by shares | Live |
| Orthopaedia Company Limited | Private company limited by shares | Live |
| DOCTOR SHA ORTHOPAEDIC CENTRE LIMITED | Private company limited by shares | Live |
| GRAND ORTHOPAEDIC CENTRE LIMITED -THE- | Private company limited by shares | Live |
| AF Orthopaedics Limited | Private company limited by shares | Live |
| ER Orthopaedics Limited | Private company limited by shares | Live |
| Bo Ji TCM Orthopaedics Limited | | Live |
| All-Round Orthopaedics Limited | Private company limited by shares | Live |
| Caleb Orthopaedics Limited | Private company limited by shares | Live |
| Hong Kong Cardiovascular & Orthopaedics MRI Centre Limited | Private company limited by shares | Live |
| HK PACIFIC ORTHOPAEDICS & REHABILITATION CENTRE LIMITED | Private company limited by shares | Live |
| Sincerus Orthopaedics and Rehabilitation Centre Limited | Private company limited by shares | Live |
| Veterinary Orthopaedics Limited | Private company limited by shares | Live |
| Dr. Steven Wong Orthopaedics Centre Limited | Private company limited by shares | Live |
| ORTHOPEDIC AND REHABILITATION PRODUCTS (ASIA) LIMITED | Private company limited by shares | Live |
| Ruixin Gufa Osteopathy Orthopedic Research Limited | Private company limited by shares | Live |
| Orchid Orthopedic Solutions HK Company Limited | Private company limited by shares | Live Commenced dormancy on 29-Oct-2014 |
| Bonovo Orthopedics International, Limited | Private company limited by shares | Live |
| INFINITY ORTHOPEDICS COMPANY LIMITED | Private company limited by shares | Live |
| Mehling Orthopedics Limited | Private company limited by shares | Live |
| ASIAN ORTHOPEDICS TECHNOLOGY HK LIMITED | Private company limited by shares | Live |
| Yikang Orthopedics Limited | Private company limited by shares | Live |
| Orthophase Industrial Limited | | Live |
| ORTHO-RELIEF LIMITED | Private company limited by shares | Live |
| ORTHORXPLAN LIMITED | Private company limited by shares | Live |
| OrthoSmart Limited | Private company limited by shares | Live |
| ORTHOSTIM ASIA LIMITED | Private company limited by shares | Live |
| ORTHOTECH HOLDING LIMITED | Private company limited by shares | Live |
| ORTHOTEK LIMITED | Private company limited by shares | Live |
| FOOTIST ORTHOTIC CENTRE LIMITED | Private company limited by shares | Dissolved |
| POLYCARE ORTHOTIC & PROSTHETIC CENTRE LIMITED | Private company limited by shares | Dissolved |
| ORTHOTIC GROUP (ASIA) LIMITED -THE- | Private company limited by shares | Dissolved |