| PACIFIC RIM SYSTEMS LIMITED | Private company limited by shares | Live |
| NET - PACIFIC SYSTEMS LIMITED | Private company limited by shares | Dissolved |
| CANTON PACIFIC SYSTEMS LIMITED | Private company limited by shares | Dissolved |
| Pacific Mona TV Systems Limited | Private company limited by shares | Live |
| PADUS SYSTEMS LIMITED | Private company limited by shares | Dissolved |
| PARA SYSTEMS LIMITED | Private company limited by shares | Dissolved |
| PARKING SYSTEMS LIMITED | Private company limited by shares | Live |
| PASTEK SYSTEMS LIMITED | Private company limited by shares | Live |
| PAYD SYSTEMS LIMITED | Private company limited by shares | Dissolved |
| PEDARO SYSTEMS LIMITED | Private company limited by shares | Dissolved |
| 5 PEOPLE SYSTEMS LIMITED | Private company limited by shares | Dissolved |
| PEOPLE'S SYSTEMS LIMITED | Private company limited by shares | Dissolved |
| PETRONEL SYSTEMS LIMITED | Private company limited by shares | Live |
| PHINARY SYSTEMS LIMITED | Private company limited by shares | Live |
| HIS PHOTONIC SYSTEMS LIMITED | Private company limited by shares | Dissolved |
| POLRIZED SYSTEMS LIMITED | Private company limited by shares | Dissolved |
| POLY SYSTEMS LIMITED | Private company limited by shares | Live |
| POLY-MED SYSTEMS LIMITED | Private company limited by shares | Dissolved |
| POLYMICRO SYSTEMS COMPANY LIMITED | Private company limited by shares | Dissolved |
| POLYTECH SYSTEMS LIMITED | Private company limited by shares | Dissolved |
| POLYWELL SYSTEMS LIMITED | Private company limited by shares | Dissolved |
| POSITRON SYSTEMS LIMITED | Private company limited by shares | Dissolved |
| SUN POWER SYSTEMS LIMITED | Private company limited by shares | Live |
| POWER SYSTEMS LIMITED | Private company limited by shares | Dissolved |
| RPM Power Systems Limited | Private company limited by shares | Dissolved |
| DG POWER SYSTEMS LIMITED | Private company limited by shares | Dissolved |
| V&P POWER SYSTEMS LIMITED | Private company limited by shares | Live |
| UBC Power Systems Limited | Private company limited by shares | Live |
| IEM Power Systems Limited | Private company limited by shares | Live |
| NR Power Systems Limited | Private company limited by shares | Live |
| ENERGYBUS POWER SYSTEMS LIMITED | Private company limited by shares | Live Commenced dormancy on 20-Mar-2007 |
| PRESERVATION SYSTEMS LIMITED | Private company limited by shares | Dissolved |
| PRO-COM SYSTEMS COMPANY LIMITED | Private company limited by shares | Dissolved |
| PROLOG SYSTEMS LIMITED | Private company limited by shares | Live |
| PROMED SYSTEMS LIMITED | Private company limited by shares | Live |
| PROTECH SYSTEMS LIMITED | Private company limited by shares | Dissolved |
| PRO-TECH SYSTEMS LIMITED | Private company limited by shares | Live |
| AEI PROTECT-ON SYSTEMS LIMITED | Private company limited by shares | Live |
| PURIFICATION SYSTEMS LIMITED | Private company limited by shares | Dissolved |
| VPN IT SYSTEMS PVT. LIMITED | Private company limited by shares | Live |
| QUARTIC SYSTEMS LIMITED | Private company limited by shares | Live |
| RADEX SYSTEMS LIMITED | Private company limited by shares | Dissolved |
| RAX-COMM SYSTEMS LIMITED | Private company limited by shares | Dissolved |
| RAYTHEON SYSTEMS LIMITED | Private company limited by shares | Dissolved |
| REALTIME SYSTEMS LIMITED | Private company limited by shares | Dissolved |
| RTS Realtime Systems HK Limited | Private company limited by shares | Live |
| R.E.D. SYSTEMS LIMITED | Private company limited by shares | Dissolved |
| SYSTEMS REGISTRATIONS LIMITED | Private company limited by shares | Live |
| RE-LAX SYSTEMS LIMITED | Private company limited by shares | Dissolved |
| SYSTEMS RESOURCES LIMITED | Private company limited by shares | Dissolved |
| Hi-tech Resources & Systems Limited | Private company limited by shares | Dissolved |
| RICHCOMTECH SYSTEMS LIMITED | Private company limited by shares | Dissolved |
| RICHTECH SYSTEMS LIMITED | Private company limited by shares | Live |
| Ricom Systems Co. Limited | Private company limited by shares | Live |
| Red Road Systems Limited | | Live |
| ROCTEC SYSTEMS LIMITED | Private company limited by shares | Live |
| ROKET SYSTEMS COMPANY LIMITED | Private company limited by shares | Dissolved |
| ROLLESTONE SYSTEMS LIMITED | Private company limited by shares | Dissolved |
| RTEC SYSTEMS LIMITED | Private company limited by shares | Dissolved |
| SATO SYSTEMS LIMITED | Private company limited by shares | Live |
| Air Seat Systems Limited | Private company limited by shares | Live |
| SYSTEMS COMPANY SECRETARIES LIMITED | Private company limited by shares | Live Commenced dormancy on 28-Jul-2016 |
| SEDNA SYSTEMS LIMITED | Private company limited by shares | Live |
| SelfTAP Pro Systems Limited | Private company limited by shares | Live |
| SERVICE SYSTEMS COMPANY LIMITED -THE- | Private company limited by shares | Dissolved |
| DSP SYSTEMS SERVICE LIMITED | Private company limited by shares | Live |
| DC Systems Service Co. Limited | | Live |
| SERVO SYSTEMS LIMITED | Private company limited by shares | Dissolved |
| Sheppard Asia Steering Systems Limited | Private company limited by shares | Live |
| SIGNAGE SYSTEMS LIMITED | Private company limited by shares | Dissolved |
| NEW SIGNAGE SYSTEMS LIMITED | Private company limited by shares | Dissolved |
| SIGNS & SYSTEMS LIMITED | Private company limited by shares | Live |
| SILO SYSTEMS LIMITED | Private company limited by shares | Dissolved |
| SILOBAGS SYSTEMS LIMITED | Private company limited by shares | Dissolved |
| SINOVIEW SYSTEMS LIMITED | Private company limited by shares | Dissolved |
| SKALI SYSTEMS LIMITED | Private company limited by shares | Live |
| SKYNET SYSTEMS LIMITED | Private company limited by shares | Dissolved |
| SLIDEHIDE Systems Limited | | Live |
| Smart Systems Limited | Private company limited by shares | Live |
| SMART ENTERPRISE SYSTEMS LIMITED | Private company limited by shares | Dissolved |
| SMARTLINK SYSTEMS LIMITED | Private company limited by shares | Live |
| SMERP SYSTEMS LIMITED | Private company limited by shares | Dissolved |
| SOFTCUBE SYSTEMS LIMITED | Private company limited by shares | Live |
| SYSTEMS SOFTWARE LIMITED | Private company limited by shares | Dissolved |
| SOLAR SYSTEMS LIMITED | Private company limited by shares | Dissolved |
| SOLAR SYSTEMS LIMITED -THE- | Private company limited by shares | Live |
| Comtec Solar Systems HK Limited | Private company limited by shares | Live |
| Solar Systems Investments Limited | Private company limited by shares | Live |
| SOLIBRAINS SYSTEMS LIMITED | Private company limited by shares | Live |
| SPLINEWARE GRAPHICS SYSTEMS LIMITED | Private company limited by shares | Dissolved |
| STABLE SYSTEMS LIMITED | Private company limited by shares | Dissolved |
| STANDARD SYSTEMS LIMITED | Private company limited by shares | Dissolved |
| SUCCESS SYSTEMS LIMITED | Private company limited by shares | Live |
| SUHHYUN SYSTEMS COMPANY LIMITED | Private company limited by shares | Live |
| SUNBIO SYSTEMS COMPANY LIMITED | Private company limited by shares | Dissolved |
| SUNLIGHT SYSTEMS LIMITED | Private company limited by shares | Live |
| SUNLIGHT SYSTEMS LIMITED | Private company limited by shares | Live |
| SUNRISE IT SYSTEMS LIMITED | Private company limited by shares | Dissolved |
| SUNRISE SYSTEMS LIMITED | Private company limited by shares | Dissolved |
| SUREN SYSTEMS LIMITED | Private company limited by shares | Live |