| Perio Care Center Limited | Private company limited by shares | Live |
| PERIO CLINIC LIMITED -THE- | Private company limited by shares | Live |
| PERIO SPECIALTY CENTRE (HK) LIMITED | Private company limited by shares | Live |
| PERIO INTERNATIONAL LIMITED | Private company limited by shares | Dissolved |
| TEN PERIOD LIMITED | Private company limited by shares | Dissolved |
| NEW PERIOD LIMITED | | Live |
| NEW PERIOD ASIA LIMITED | Private company limited by shares | Dissolved |
| BEST PERIOD LIMITED | Private company limited by shares | Dissolved |
| CLASSIC PERIOD LIMITED | Private company limited by shares | Dissolved |
| Flourishing Period Limited | Private company limited by shares | Live |
| GOLD PERIOD LIMITED | Private company limited by shares | Dissolved |
| POWER PERIOD LIMITED | Private company limited by shares | Dissolved |
| PROSPEROUS PERIOD COMPANY LIMITED | Private company limited by shares | Live |
| BUSINESS LEADER PERIODICAL OFFICE LIMITED | Private company limited by shares | Dissolved |
| HK PERFECTION FRONTLINE PERIODICAL LIMITED | Private company limited by shares | Dissolved |
| REVISION PERIODICAL LIMITED | Private company limited by shares | Dissolved |
| INTELLIGENT PERIODICALS LIMITED | Private company limited by shares | Dissolved |
| CHINA NEWSPAPERS & PERIODICALS PUBLISHING GROUP LIMITED | Private company limited by shares | Dissolved |
| CONTEMPORARY PERIODONTAL CARE LIMITED | Private company limited by shares | Live |
| PERIODONTIC CENTER LIMITED -THE- | Private company limited by shares | Live |
| PERION LIMITED | Private company limited by shares | Dissolved |
| Hong Kong College of Perioperative Nursing Limited | Company limited by guarantee | Live |
| Perioperative Medicine Publishing Limited | | Live |
| Journal Of Perioperative Science Limited | Private company limited by shares | Live |