| TRIANGLE SYSTEM LIMITED | Private company limited by shares | Live |
| TRIANGLE THREE COMPANY LIMITED | Private company limited by shares | Dissolved |
| TRIANGLE TOYS LIMITED | Private company limited by shares | Dissolved |
| Triangle View Limited | Private company limited by shares | Live |
| TRIANGLE APPLIANCES ZHANJIANG LIMITED | Private company limited by shares | Dissolved |
| trianglebest Limited | Private company limited by shares | Live |
| TRIANGLE-ISUZU MOTORS LIMITED | Private company limited by shares | Live |
| TriangleThree Consulting Limited | Private company limited by shares | Live |
| TRIANGO LIMITED | Private company limited by shares | Dissolved |
| TRIANGO LIMITED | Private company limited by shares | Live |
| TRIANGOLD MANUFACTURING CO. LIMITED | Private company limited by shares | Dissolved |
| TRIANGULAR LIMITED | Private company limited by shares | Dissolved |
| TRIANGULO LIMITED | Private company limited by shares | Live |
| Triangulum Limited | Private company limited by shares | Live |
| TRIANON LIMITED | Private company limited by shares | Dissolved |
| Trianon Limited | Private company limited by shares | Live |
| TRIAPACIFIC INDUSTRIAL LIMITED | Private company limited by shares | Live |
| TriApex Laboratories (HK) Co., Limited | | Live |
| TRIARC ENTERPRISE LIMITED | Private company limited by shares | Dissolved |
| TRIARIEL COMPANY LIMITED | Private company limited by shares | Dissolved |
| TRI-ART LIMITED | Private company limited by shares | Dissolved |
| TRI-ART FURNITURE COMPANY LIMITED | Private company limited by shares | Dissolved |
| TRIAS COMPANY LIMITED | Private company limited by shares | Dissolved |
| TRIASSIC LIMITED | Private company limited by shares | Dissolved |
| TRIASTA INTERNATIONAL LIMITED | Private company limited by shares | Live |
| Triata Capital Limited | Private company limited by shares | Live |
| Triathlon Limited | | Live |
| TRIATHLON PHYSIOTHERAPY CENTRE LIMITED | Private company limited by shares | Live |
| WTN TRIATHLON SPORTS LIMITED | Private company limited by shares | Dissolved |
| NEW SPORTS TRIATHLON LIMITED | | Live |
| Triathlon Tech Limited | | Live |
| TRIATOMIC ENTERPRISES LIMITED | Private company limited by shares | Dissolved |
| TRIATON CHINA LIMITED | Private company limited by shares | Dissolved |
| Triatoris Limited | Private company limited by shares | Live |
| TRI-ATRIC COMPANY LIMITED | Private company limited by shares | Live |
| TRIAVEST LIMITED | Private company limited by shares | Dissolved |