| SING KAU ENGINEERING LIMITED | Private company limited by shares | Live |
| SING KEE ENGINEERING COMPANY LIMITED | Private company limited by shares | Dissolved |
| MAN SING ENGINEERING COMPANY LIMITED | Private company limited by shares | Dissolved |
| SING SING ENGINEERING CO. LIMITED | Private company limited by shares | Live |
| SING FAI ENGINEERING LIMITED | Private company limited by shares | Dissolved |
| HOP SING ENGINEERING COMPANY LIMITED | Private company limited by shares | Dissolved |
| SING HO ENGINEERING CO. LIMITED | Private company limited by shares | Dissolved |
| SING FAI (R & M) ENGINEERING LIMITED | Private company limited by shares | Live |
| HOI SING ENGINEERING LIMITED | Private company limited by shares | Live |
| KIT SING ENGINEERING LIMITED | Private company limited by shares | Live |
| KAI SING ENGINEERING LIMITED | Private company limited by shares | Live |
| YIP SING ENGINEERING COMPANY LIMITED | Private company limited by shares | Live |
| SING FAT ENGINEERING COMPANY LIMITED | Private company limited by shares | Dissolved |
| YUK SING ENGINEERING COMPANY LIMITED | Private company limited by shares | Live |
| WAI SING ENGINEERING COMPANY LIMITED | Private company limited by shares | Live |
| SING WUI ENGINEERING COMPANY LIMITED | Private company limited by shares | Live |
| SING SUN ENGINEERING COMPANY LIMITED | Private company limited by shares | Live |
| KAI SING FAN ENGINEERING LIMITED | Private company limited by shares | Live |
| SING YAT ENGINEERING LIMITED | Private company limited by shares | Live |
| SING FAI ENGINEERING COMPANY LIMITED | Private company limited by shares | Live |
| YI SING ENGINEERING COMPANY LIMITED | Private company limited by shares | Dissolved |
| WO SING ENGINEERING LIMITED | Private company limited by shares | Live |
| SAM SING ENGINEERING COMPANY LIMITED | Private company limited by shares | Live |
| SING TAT ENGINEERING COMPANY LIMITED | Private company limited by shares | Live |
| Yiu Sing Engineering Limited | Private company limited by shares | Live |
| Sing Ho Engineering Company Limited | Private company limited by shares | Live |
| SUN WAH SING ENGINEERING LIMITED | Private company limited by shares | Live |
| SING HO (HK ENGINEERING) COMPANY LIMITED | Private company limited by shares | Live |
| YU SING ENGINEERING LIMITED | Private company limited by shares | Live |
| SING TO ENGINEERING LIMITED | Private company limited by shares | Live |
| Sing Hao Engineering Limited | Private company limited by shares | Live |
| HOP SING ENGINEERING LIMITED | Private company limited by shares | Live |
| KIU SING ENGINEERING COMPANY LIMITED | Private company limited by shares | Live |
| On Sing Engineering Limited | Private company limited by shares | Live |
| TAT SING ENGINEERING LIMITED | Private company limited by shares | Live |
| SON SING ENGINEERING LIMITED | Private company limited by shares | Live |
| HO SING ENGINEERING COMPANY LIMITED | Private company limited by shares | Live |
| Sing Ken Engineering Limited | Private company limited by shares | Live |
| Jun Sing Engineering Co Limited | Private company limited by shares | Live |
| FU SING ENGINEERING COMPANY LIMITED | Private company limited by shares | Live |
| Zan Sing Engineering Limited | Private company limited by shares | Live |
| SING ENGINEERING LIMITED | Private company limited by shares | Live |
| KA SING ENGINEERING COMPANY LIMITED | Private company limited by shares | Live |
| SING PAK ENGINEERING LIMITED | Private company limited by shares | Live |
| Sing Tuo Engineering Limited | Private company limited by shares | Live |
| Sing Mei Engineering Limited | Private company limited by shares | Live |
| WAN SING ENGINEERING COMPANY LIMITED | Private company limited by shares | Live |
| Kam Sing Engineering Limited | Private company limited by shares | Live |
| Man Sing Engineering HK Limited | Private company limited by shares | Live |
| YU SING ENGINEERING HK LIMITED | Private company limited by shares | Live |
| Chi Sing Engineering Company Limited | Private company limited by shares | Live |
| MEI SING ENGINEERING LIMITED | Private company limited by shares | Live |
| WAH SING ENGINEERING LIMITED | Private company limited by shares | Live |
| BAN SING ENGINEERING COMPANY LIMITED | Private company limited by shares | Live |
| YAT SING E & M ENGINEERING COMPANY LIMITED | Private company limited by shares | Live |
| YAU SING ENGINEERING COMPANY LIMITED | Private company limited by shares | Live |
| Kin Sing Engineering Limited | Private company limited by shares | Live |
| SING YEE ENGINEERING LIMITED | Private company limited by shares | Live |
| KIN SING ENGINEERING HK LIMITED | Private company limited by shares | Live |
| Ga Sing Engineering Limited | Private company limited by shares | Live |
| Dak Sing Engineering Limited | Private company limited by shares | Live |
| Iu Sing Engineering Limited | Private company limited by shares | Live |
| WAH SING HK ENGINEERING LIMITED | Private company limited by shares | Live |
| KUI SING ENGINEERING COMPANY LIMITED | Private company limited by shares | Live |
| TAI SING ENGINEERING LIMITED | Private company limited by shares | Live |
| You Sing Engineering Limited | Private company limited by shares | Live |
| SING YIU ENGINEERING COMPANY LIMITED | Private company limited by shares | Live |
| Foo Sing Engineering Limited | Private company limited by shares | Live |
| Sing Yuk Engineering Limited | Private company limited by shares | Live |
| Tin Sing Engineering HK Limited | Private company limited by shares | Live |
| Nic Sing Engineering Limited | Private company limited by shares | Live |
| YUK SING ENGINEERING LIMITED | Private company limited by shares | Live |
| YAT SING ENGINEERING LIMITED | | Live |
| SING & WAI ENGINEERING LIMITED | | Live |
| Sing Wan Engineering Limited | | Live |
| HE KAM SING ENGINEERING LIMITED | | Live |
| Sing Wa Engineering Company Limited | | Live |
| Fok Sing Engineering Limited | | Live |
| KAN SING ENGINEERING LIMITED | | Live |
| Sing Yue Engineering Company Limited | | Live |
| Sing Hoi Engineering Limited | | Live |
| Ci Sing Engineering Limited | | Live |
| SAN SING ENGINEERING COMPANY LIMITED | | Live |
| MAN SING ENGINEERING LIMITED | | Live |
| Yik Sing Engineering Limited | | Live |
| SING MAN ENGINEERING LIMITED | | Live |
| SING YEE ENGINEERING LIMITED | | Live |
| LIK SING AIR ENGINEERING LIMITED | | Live |
| KUN SING ENGINEERING CO. LIMITED | | Live |
| JUK SING ENGINEERING LIMITED | | Live |
| SING FAI ADVERTISING ENGINEERING LIMITED | Private company limited by shares | Live |
| SING FAI AIR-CONDITION ENGINEERING LIMITED | Private company limited by shares | Live |
| YIU SING AIR-CONDITION ENGINEERING COMPANY LIMITED | Private company limited by shares | Live |
| Yiu Sing Alliance Engineering Co., Limited | Private company limited by shares | Live |
| SING MEI ASIA ENGINEERING LIMITED | | Live |
| YU YIU SING BROTHERS ENGINEERING COMPANY LIMITED | Private company limited by shares | Dissolved |
| YAT SING CABLE ENGINEERING LIMITED | Private company limited by shares | Live |
| Gaam Sing Cable Engineering Limited | Private company limited by shares | Live |
| Sing Chak Engineering Company Limited | | Live |
| CHIT SING PAINT ENGINEERING LIMITED | Private company limited by shares | Dissolved |