| Sing Wai Electrical Engineering Limited | Private company limited by shares | Live |
| HO SING ELECTRICAL ENGINEERING LIMITED | Private company limited by shares | Live |
| SING YU ELECTRICAL ENGINEERING CO. LIMITED | Private company limited by shares | Live |
| Yat Sing Electrical Engineering Company Limited | Private company limited by shares | Live |
| Kin Sing Electrical Engineering Limited | Private company limited by shares | Live |
| Sing Sai Electrical Engineering Company Limited | Private company limited by shares | Live |
| WAH SING ELECTRICAL ENGINEERING COMPANY LIMITED | Private company limited by shares | Live |
| Yuk Sing Electrical Engineering Limited | | Live |
| Sing Tat Air-Condition & Electrical Engineering Limited | Private company limited by shares | Live |
| CHONG SING ELECTRICAL ENGINEERING COMPANY LIMITED | Private company limited by shares | Live |
| CHUNG SING ELECTRICAL ENGINEERING CO. LIMITED | Private company limited by shares | Dissolved |
| FU SING ELECTRICAL ENGINEERING CO., LIMITED | Private company limited by shares | Dissolved |
| HING SING ELECTRICAL ENGINEERING LIMITED | Private company limited by shares | Live |
| WAH SING ELECTRICAL & MECHANICAL ENGINEERING COMPANY LIMITED | Private company limited by shares | Live |
| MING SING ELECTRICAL ENGINEERING LIMITED | Private company limited by shares | Dissolved |
| WING SING ELECTRICAL ENGINEERING LIMITED | Private company limited by shares | Live |
| KIN SING ELECTRONIC (ENGINEERING) LIMITED | Private company limited by shares | Dissolved |
| SING FAI ENGINEERING ENTERPRISE COMPANY LIMITED | Private company limited by shares | Live |
| SING FIELD ENGINEERING LIMITED | Private company limited by shares | Live |
| FOOK SING ENGINEERING LIMITED | Private company limited by shares | Dissolved |
| SING FORTUNE ENGINEERING COMPANY LIMITED | Private company limited by shares | Dissolved |
| Gaam Sing Engineering Limited | Private company limited by shares | Live |
| SUN SING GEOTECHNICAL ENGINEERING COMPANY LIMITED | Private company limited by shares | Dissolved |
| NEW SING (GLOBAL) ENGINEERING LIMITED | Private company limited by shares | Live |
| Sing Good E&M Engineering Limited | Private company limited by shares | Live |
| Grand Sing Engineering Limited | | Live |
| GUANG SING ENGINEERING LIMITED | Private company limited by shares | Dissolved |
| HANG SING ENGINEERING LIMITED | Private company limited by shares | Dissolved |
| SUN HANG SING ENGINEERING LIMITED | Private company limited by shares | Dissolved |
| HANG SING ENGINEERING CO. LIMITED | Private company limited by shares | Live |
| Hang Sing Engineering (Hong Kong) Limited | Private company limited by shares | Live |
| HANG SING IRON ENGINEERING COMPANY LIMITED | Private company limited by shares | Live |
| HANG SING (LPGTG) ENGINEERING CO. LIMITED | Private company limited by shares | Live |
| SING HING ENGINEERING LIMITED | Private company limited by shares | Live |
| Hing Sing Engineering Limited | Private company limited by shares | Live |
| HING SING ENGINEERING CO., LIMITED | Private company limited by shares | Dissolved |
| Sing Hing Engineering Hong Kong Limited | | Live |
| YIU SING ENGINEERING (HK) COMPANY LIMITED | Private company limited by shares | Live |
| LIP SING ENGINEERING (H.K.) LIMITED | Private company limited by shares | Dissolved |
| KIN SING ENGINEERING (HK) COMPANY LIMITED | Private company limited by shares | Dissolved |
| KAM SING ENGINEERING (HK) COMPANY LIMITED | Private company limited by shares | Dissolved |
| TAI SING (H.K.) ENGINEERING LIMITED | Private company limited by shares | Dissolved |
| Chi Sing Engineering (HK) Company Limited | Private company limited by shares | Live |
| SING LEE ENGINEERING (HK) LIMITED | Private company limited by shares | Dissolved |
| HOI SING (HK) ENGINEERING LIMITED | Private company limited by shares | Live |
| YAU SING (HK) ENGINEERING LIMITED | Private company limited by shares | Live |
| Po Sing Engineering (HK) Limited | Private company limited by shares | Live |
| Fu Sing (HK) Engineering Company Limited | Private company limited by shares | Live |
| Ho Sing Engineering (HK) Company Limited | Private company limited by shares | Live |
| TAT SING ENGINEERING (HK) LIMITED | Private company limited by shares | Dissolved |
| LOK SING (HK) ENGINEERING LIMITED | Private company limited by shares | Live |
| SING FAI ENGINEERING (HK) COMPANY LIMITED | Private company limited by shares | Live |
| TAI SING (HK) ENGINEERING LIMITED | Private company limited by shares | Live |
| Ka Sing Engineering (HK) Limited | Private company limited by shares | Live |
| TAI SING ENGINEERING (HK) LIMITED | | Live |
| DAI SING ENGINEERING (HK) LIMITED | | Live |
| Sing Wei Engineering (HK) Limited | | Live |
| SING KWONG ENGINEERING (HK) CO. LIMITED | Private company limited by shares | Live |
| MING SING (HK) ENGINEERING CO. LIMITED | Private company limited by shares | Live |
| HOLD SING ENGINEERING COMPANY LIMITED | Private company limited by shares | Live |
| FU SING ENGINEERING (HONG KONG) COMPANY LIMITED | Private company limited by shares | Dissolved |
| SING TAT ENGINEERING HONG KONG LIMITED | Private company limited by shares | Live |
| TAK SING ENGINEERING (HONG KONG) LIMITED | Private company limited by shares | Live |
| WAI SING ENGINEERING (HONG KONG) COMPANY LIMITED | Private company limited by shares | Live |
| KAI SING ENGINEERING (HONG KONG) LIMITED | Private company limited by shares | Live |
| Sing Mok Engineering Hong Kong Company Limited | Private company limited by shares | Live |
| SING YUE INDUSTRIAL ENGINEERING CO., LIMITED | Private company limited by shares | Live |
| SING FAI INK-LINE ENGINEERING COMPANY LIMITED | Private company limited by shares | Live |
| SING KONG IRON ENGINEERING LIMITED | Private company limited by shares | Live |
| JIAN SING ENGINEERING LIMITED | | Live |
| Keung Sing Air Conditioning Engineering Limited | Private company limited by shares | Live |
| Kits Sing Engineering Limited | | Live |
| KONG SING ENGINEERING COMPANY LIMITED | Private company limited by shares | Dissolved |
| KONG SING ENGINEERING COMPANY LIMITED | Private company limited by shares | Live |
| MING SING ENGINEERING (HONG KONG) LIMITED | Private company limited by shares | Live |
| SING KUNG ENGINEERING LIMITED | Private company limited by shares | Dissolved |
| KWAN SING ENGINEERING LIMITED | Private company limited by shares | Dissolved |
| KWAN SING ENGINEERING CO., LIMITED | Private company limited by shares | Live |
| KWUN SING ENGINEERING LIMITED | Private company limited by shares | Live |
| Leung Sing Engineering Company Limited | Private company limited by shares | Live |
| YAT SING MACHINERY & ELECTRIC ENGINEERING LIMITED | Private company limited by shares | Dissolved |
| SING TAT MAINTENANCE & ENGINEERING COMPANY LIMITED | Private company limited by shares | Live |
| SING FAI MARBLE (ENGINEERING) COMPANY LIMITED | Private company limited by shares | Live |
| LAI SING MARBLE ENGINEERING COMPANY LIMITED | Private company limited by shares | Dissolved |
| TAK SING MARBLE ENGINEERING COMPANY LIMITED | | Live |
| MEE SING MARINE AND ENGINEERING COMPANY LIMITED | Private company limited by shares | Dissolved |
| HOI SING MARINE ENGINEERING LIMITED | Private company limited by shares | Dissolved |
| KIN SING MARINE ENGINEERING CO., LIMITED | Private company limited by shares | Dissolved |
| SING KONG MARINE ENGINEERING LIMITED | Private company limited by shares | Live |
| ME SING MECHANICAL ENGINEERING CO. LIMITED | Private company limited by shares | Live |
| HIP SING MECHANICAL ENGINEERING LIMITED | Private company limited by shares | Dissolved |
| KWUN SING Mechanical Engineering Company Limited | | Live |
| MING SING ENGINEERING COMPANY LIMITED | Private company limited by shares | Live |
| Sing Moon Engineering Limited | Private company limited by shares | Live |
| Sing Ngai Engineering Company Limited | Private company limited by shares | Live |
| NGAI SING ENGINEERING COMPANY LIMITED | Private company limited by shares | Live |
| SING NGAI ENGINEERING LIMITED | | Live |
| Sing Yu Pang Yip Engineering Limited | | Live |
| PARK SING ENGINEERING LIMITED | Private company limited by shares | Live |
| Hang Sing Planning and Engineering Company Limited | Private company limited by shares | Live |