| ULTRACA LIMITED | Private company limited by shares | Live |
| ULTRACARE MEDICAL & DENTAL SERVICES LIMITED | Private company limited by shares | Dissolved |
| UltraChip HK Limited | Private company limited by shares | Live |
| UltraCircuits Technology Limited | Private company limited by shares | Live |
| ULTRACOM LIMITED | Private company limited by shares | Dissolved |
| ULTRACOM LIMITED | Private company limited by shares | Dissolved |
| ULTRACOM TECHNOLOGY LIMITED | Private company limited by shares | Live |
| Ultracombo Limited | Private company limited by shares | Live |
| UltraConnexus Limited | | Live |
| ULTRACORP COMPANY LIMITED | Private company limited by shares | Dissolved |