| Diag Limited | | Live |
| DIAG TRADE CO., LIMITED | Private company limited by shares | Live |
| DIAG INTERNATIONAL LIMITED | | Live |
| DiagCare Limited | Private company limited by shares | Live |
| DiagCor Bioscience Limited | Private company limited by shares | Live |
| DIAGCOR (HOLDING) COMPANY LIMITED | Private company limited by shares | Live |
| DIAGDELIVERY LIMITED | Private company limited by shares | Dissolved |
| DIA-GEM LIMITED | Private company limited by shares | Dissolved |
| DIAGEM JEWELS LIMITED | Private company limited by shares | Dissolved |
| DIAGLO TRADING LIMITED | Private company limited by shares | Live |
| DIAGNAL LIMITED | Private company limited by shares | Live |
| DIAGNOCHIP LIMITED | Private company limited by shares | Dissolved |
| Diagnogen Limited | | Live |
| Retinal Diagnos (Hong Kong) Limited | Private company limited by shares | Live |
| OTECH DIAGNOS LIMITED | Private company limited by shares | Live |
| Diagnose Early Hong Kong Limited | Private company limited by shares | Live |
| iCarbonx Diagnosis Investment Limited | | Live |
| Worg Diagnosis(HongKong) Co., Limited | | Live |
| CFT DIAGNOSTIC LIMITED | Private company limited by shares | Dissolved |
| DIAGNOSTIC BOX LIMITED -THE- | Private company limited by shares | Live |
| Diagnostic Way Limited | Private company limited by shares | Live |
| EP DIAGNOSTIC LIMITED | Private company limited by shares | Live |
| Diagnostic One Company Limited | | Live |
| Bioeco Diagnostic Limited | | Live |
| 519 Skin Analysis and Diagnostic Centre Limited | | Live |
| PROMED DIAGNOSTIC CENTRE LIMITED | Private company limited by shares | Live |
| DIAGNOSTICBIO LIMITED | Private company limited by shares | Dissolved |
| GEO DIAGNOSTICS LIMITED | Private company limited by shares | Dissolved |
| CCL DIAGNOSTICS LIMITED | Private company limited by shares | Dissolved |
| Top Diagnostics SRL Limited | Private company limited by shares | Live |
| MST DIAGNOSTICS HK LIMITED | Private company limited by shares | Live |
| GAP DIAGNOSTICS LIMITED | Private company limited by shares | Dissolved |
| TEK DIAGNOSTICS LIMITED | Private company limited by shares | Dissolved |
| Qi Diagnostics Limited | Private company limited by shares | Live |
| DIAGNOSTICS LIMITED | | Live |
| APAC Diagnostics Limited | Private company limited by shares | Live |
| BIO-ASIA DIAGNOSTICS COMPANY LIMITED | Private company limited by shares | Live |
| HK.DNA Diagnostics Centre Limited | Private company limited by shares | Live |
| HK.DNA Diagnostics Centre Limited | Private company limited by shares | Live |
| HEALTHCARE DIAGNOSTICS CHINA LIMITED | Private company limited by shares | Live |
| GENERAL DIAGNOSTICS LIMITED | | Live |
| HEALTHCARE DIAGNOSTICS LIMITED | Private company limited by shares | Live |
| DIAGNOSTICS-ACCESS COMPANY LIMITED | Private company limited by shares | Live |
| DIAGNOTECH COMPANY LIMITED | Private company limited by shares | Dissolved |
| DiagnoVEX Therapeutics Limited | | Live |
| DIAGON JUNGLE COMPANY LIMITED | | Live |
| DIAGONAL LIMITED | Private company limited by shares | Dissolved |
| DIAGONAL INVESTMENT LIMITED | Private company limited by shares | Dissolved |
| SHENZHEN DIAGPOWER TECH CO., LIMITED | Private company limited by shares | Live |
| DIAGRAM LIMITED | Private company limited by shares | Live |
| HONGKONG DIAGRAM TECHNOLOGY COMPANY LIMITED | | Live |
| DIAGRAM PRODUCT LIMITED | Private company limited by shares | Dissolved |
| DIAGTECH PACIFIC LIMITED | Private company limited by shares | Dissolved |