| HK LED SIGNLIGHT CO., LIMITED | Private company limited by shares | Dissolved |
| SIGNLINK LIMITED | Private company limited by shares | Live |
| SIGNLOGIC COMPANY LIMITED | Private company limited by shares | Live |
| SIGNODE HONG KONG LIMITED | Private company limited by shares | Live |
| SIGNODE INTERNATIONAL HOLDING LIMITED | Private company limited by shares | Dissolved |
| SIGNORI LIMITED | Private company limited by shares | Dissolved |
| LA SIGNORINA LIMITED | Private company limited by shares | Dissolved |
| SIGNPOST (HK) LIMITED | Private company limited by shares | Live |
| Signpost Corporation (Hong Kong) Limited | Private company limited by shares | Live |
| HK SIGNPOSTS JIAOZI SHOES (INTERNATIONAL) GROUP LIMITED | Private company limited by shares | Dissolved |
| AUBREY SIGNPRO CO., LIMITED | Private company limited by shares | Live |
| SIGNREAL INVESTMENT COMPANY LIMITED | Private company limited by shares | Dissolved |
| LED Signs Limited | Private company limited by shares | Live |
| ALL SIGNS LIMITED | Private company limited by shares | Live |
| TOP SIGNS LIMITED | Private company limited by shares | Dissolved |
| LANDEA SIGNS CO., LIMITED | Private company limited by shares | Live |
| EURO LED SIGNS LIMITED | Private company limited by shares | Dissolved |
| LUCK SIGNS LIMITED | Private company limited by shares | Live |
| SIGNSIRI LIMITED | Private company limited by shares | Live |
| SIGNSKY INTERNATIONAL LIMITED | Private company limited by shares | Dissolved |
| SIGNSOUND LIMITED | Private company limited by shares | Live |
| SIGNSYS LIMITED | Private company limited by shares | Live |
| SIGNTAI LIMITED | Private company limited by shares | Live |
| SIGNTEC LIMITED | Private company limited by shares | Dissolved |
| AJ SIGNTECH LIMITED | Private company limited by shares | Dissolved |
| SIGNTECH COMPANY LIMITED | Private company limited by shares | Dissolved |
| SIGNTELECOM LIMITED | Private company limited by shares | Live |
| SIGNTEX (HK) LIMITED | Private company limited by shares | Dissolved |
| SIGNTIME INVESTMENTS LIMITED | Private company limited by shares | Dissolved |
| SIGNTON LIMITED | Private company limited by shares | Dissolved |
| SIGNTRIP INVESTMENTS LIMITED | Private company limited by shares | Live |
| SIGNTRONICS LIMITED | Private company limited by shares | Live |
| SIGNUM CO. LIMITED | Private company limited by shares | Live |
| Signumqualitas Limited | Private company limited by shares | Live |
| SIGNUS (HK) CO., LIMITED | Private company limited by shares | Dissolved |
| SIGNUS GROUP LIMITED | Private company limited by shares | Live |
| SIGNWAY LIMITED | Private company limited by shares | Dissolved |
| Signwell Company Limited | Private company limited by shares | Live |
| ZHEJIANG SIGNWIN TECHNOLOGY CO., LIMITED | Private company limited by shares | Live |
| SIGNWISE LIMITED | Private company limited by shares | Live |
| SIGO LIMITED | Private company limited by shares | Dissolved |
| Sigo Limited | Private company limited by shares | Dissolved |
| SIGO LIMITED | Private company limited by shares | Live |
| SIGODA (HONG KONG) LIMITED | Private company limited by shares | Dissolved |
| SIGOMO CO., LIMITED | Private company limited by shares | Live |
| SHENZHEN SIG-ONE TECHNOLOGY COMPANY LIMITED | Private company limited by shares | Live |
| Sigoods Technology Co., Limited | Private company limited by shares | Live |
| Sigowill Bio Meditech Limited | Private company limited by shares | Live |
| SigPlus Trading HK Co. Limited | Private company limited by shares | Live |
| SIGRI GROUP ITALY CO., LIMITED | Private company limited by shares | Dissolved |
| SIGroup Limited | Private company limited by shares | Dissolved |
| Sigrun Limited | Private company limited by shares | Live |
| HONG KONG SIGSENSOR MICROSYSTEM CO., LIMITED | Private company limited by shares | Live |
| Sigssoft Limited | Private company limited by shares | Live |
| Sigsus Technology Hong Kong Limited | Private company limited by shares | Live |
| SIGTEST TECHNOLOGY CO., LIMITED | Private company limited by shares | Live |
| Sigue Global Services (Hong Kong) Limited | Private company limited by shares | Live |
| SIGUL ENGINEERING CO., LIMITED | Private company limited by shares | Live |
| SIGUREDO LIMITED | Private company limited by shares | Dissolved |
| Sigway Higgs Group Limited | Private company limited by shares | Live |