| SSH Communications Security Limited | Private company limited by shares | Live |
| SUT LICK SECURITY & COMMUNICATIONS CO. LIMITED | Private company limited by shares | Live |
| TECHNOLOGY COMMUNICATIONS & SECURITY (ASIA) LIMITED | Private company limited by shares | Dissolved |
| TRANS ASIA COMMUNICATIONS & SECURITY LIMITED | Private company limited by shares | Live |
| Seeds Communications Limited | Private company limited by shares | Live |
| SEES COMMUNICATIONS LIMITED | Private company limited by shares | Dissolved |
| SENSES COMMUNICATIONS LIMITED | Private company limited by shares | Dissolved |
| SENSES COMMUNICATIONS LIMITED | Private company limited by shares | Dissolved |
| SENSES SAFECOM COMMUNICATIONS LIMITED | Private company limited by shares | Dissolved |
| SEQUANS COMMUNICATIONS HK LIMITED | Private company limited by shares | Live Commenced dormancy on 12-Sep-2007 |
| Serif Communications & Design Limited | Private company limited by shares | Live |
| SERVCORP COMMUNICATIONS LIMITED | Private company limited by shares | Dissolved |
| BPI COMMUNICATIONS SERVICE LIMITED | Private company limited by shares | Dissolved |
| UFL COMMUNICATIONS SERVICE LIMITED | Private company limited by shares | Dissolved |
| Seven Communications Limited | Private company limited by shares | Live |
| SHAMPOO COMMUNICATIONS LIMITED | Private company limited by shares | Dissolved |
| SHANDONG YHLTNET COMMUNICATIONS & TECHNOLOGY CO., LIMITED | Private company limited by shares | Live |
| SHANGER ADVERTISING & COMMUNICATIONS (H.K.) LIMITED | Private company limited by shares | Dissolved |
| Shanghai Yongpang Communications Equipment Co., Limited | Private company limited by shares | Live |
| Shanghai Peace Communications Company Limited | Private company limited by shares | Live |
| SHEDIAC COMMUNICATIONS LIMITED | Private company limited by shares | Live |
| SHENBANG COMMUNICATIONS (HONGKONG) LIMITED | Private company limited by shares | Live |
| SHERWOOD COMMUNICATIONS LIMITED | Private company limited by shares | Live Commenced dormancy on 01-Dec-1999 |
| SH(H.K.) COMMUNICATIONS LIMITED | Private company limited by shares | Live |
| CHINA SHINETOP COMMUNICATIONS LIMITED | Private company limited by shares | Dissolved |
| SHINKANSEN COMMUNICATIONS LIMITED | Private company limited by shares | Dissolved |
| Shivila Communications Private Limited | Private company limited by shares | Live |
| Shout Sheng Communications, Limited | Private company limited by shares | Dissolved |
| SIGMA COMMUNICATIONS INFORMATION CO., LIMITED | Private company limited by shares | Dissolved |
| Signal Communications Limited | Private company limited by shares | Live |
| SIGNATURE COMMUNICATIONS LIMITED | Private company limited by shares | Live |
| SPIDER SILK COMMUNICATIONS LIMITED | Private company limited by shares | Live |
| SILVERTECH COMMUNICATIONS LIMITED | Private company limited by shares | Live |
| SIM-TEL COMMUNICATIONS LIMITED | Private company limited by shares | Dissolved |
| SINCLAIR COMMUNICATIONS LIMITED | Private company limited by shares | Live |
| SINGH COMMUNICATIONS LIMITED | Private company limited by shares | Live |
| Sinofame Communications Group Limited | Private company limited by shares | Live |
| SINOFIDES COMMUNICATIONS CONSULTANTS LIMITED | Private company limited by shares | Dissolved |
| SinoGlobal Communications Limited | Private company limited by shares | Live |
| SINOLOGUE COMMUNICATIONS LIMITED | Private company limited by shares | Dissolved |
| SINOT COMMUNICATIONS LIMITED | Private company limited by shares | Live |
| SINOVO COMMUNICATIONS LIMITED | Private company limited by shares | Dissolved |
| SINOWAVE COMMUNICATIONS LIMITED | Private company limited by shares | Dissolved |
| SIPTECK COMMUNICATIONS LIMITED | Private company limited by shares | Live |
| SIRIUS COMMUNICATIONS CORPORATION LIMITED | Private company limited by shares | Live |
| SIXSCAPE COMMUNICATIONS LIMITED | Private company limited by shares | Dissolved |
| SKYLAN COMMUNICATIONS LIMITED | Private company limited by shares | Live |
| SKYLINE COMMUNICATIONS LIMITED | Private company limited by shares | Live |
| SKYLINE COMMUNICATIONS HK LIMITED | Private company limited by shares | Live |
| Skywalker Communications Group Limited | Private company limited by shares | Live |
| SKYWARD COMMUNICATIONS LIMITED | Private company limited by shares | Dissolved |
| SKYWARE COMMUNICATIONS LIMITED | Private company limited by shares | Live |
| SLASH COMMUNICATIONS CONSULTANTS LIMITED | Private company limited by shares | Live |
| SLOH COMMUNICATIONS LIMITED | Private company limited by shares | Dissolved |
| Slowly Communications Limited | Private company limited by shares | Live |
| GET SMART (COMMUNICATIONS) LIMITED | Private company limited by shares | Dissolved |
| SMART COMMUNICATIONS LIMITED | Private company limited by shares | Live |
| SMART SENSE COMMUNICATIONS COMPANY LIMITED | Private company limited by shares | Live |
| SMILING FACES COMMUNICATIONS LIMITED | Private company limited by shares | Live |
| SMITH-MANN COMMUNICATIONS LIMITED | Private company limited by shares | Live |
| STRATEGIC SOCIAL COMMUNICATIONS LIMITED | Private company limited by shares | Live |
| SoIN Communications Limited | | Live |
| Soliswide Communications Limited | | Live |
| Solomon Communications Limited | Private company limited by shares | Live |
| Soluxns Communications Limited | Private company limited by shares | Dissolved |
| SONNET COMMUNICATIONS LIMITED | Private company limited by shares | Dissolved |
| S.O.S. COMMUNICATIONS (H.K.) LIMITED | Private company limited by shares | Live |
| ASIA SOURCING & COMMUNICATIONS LIMITED | | Live |
| FLOAT COMMUNICATIONS SOURCING AND TRADING (HK) LIMITED | Private company limited by shares | Live |
| SOUTH TOP COMMUNICATIONS LIMITED | Private company limited by shares | Dissolved |
| SOUTH COMMUNICATIONS CO. LIMITED | Private company limited by shares | Live |
| Southern Communications HongKong Limited | Private company limited by shares | Live |
| SPACE COMMUNICATIONS LIMITED | Private company limited by shares | Dissolved |
| SPACE COMMUNICATIONS LIMITED | Private company limited by shares | Live |
| A SPARK COMMUNICATIONS LIMITED | Private company limited by shares | Live |
| SPARK COMMUNICATIONS LIMITED | Private company limited by shares | Live |
| Spark Communications HK Limited | Private company limited by shares | Live |
| SPECTRUM COMMUNICATIONS LIMITED | Private company limited by shares | Dissolved |
| SPECTRUM STRATEGIC COMMUNICATIONS COMPANY LIMITED | Private company limited by shares | Live |
| SPECULA COMMUNICATIONS CONSULTANCY LIMITED | Private company limited by shares | Dissolved |
| SPEEDNET COMMUNICATIONS (HONG KONG) LIMITED | Private company limited by shares | Live Commenced dormancy on 15-Apr-2003 |
| SpeedWind Communications Limited | Private company limited by shares | Live |
| SPIRENT COMMUNICATIONS (ASIA) LIMITED | Private company limited by shares | Live |
| SPIRENT COMMUNICATIONS CHINA LIMITED | Private company limited by shares | Dissolved |
| Yellow spot communications Limited | Private company limited by shares | Live |
| Spreadway Communications Technology (HongKong) Co., Limited | Private company limited by shares | Dissolved |
| Ten Square Communications Limited | Private company limited by shares | Live |
| Square Communications Limited | Private company limited by shares | Live |
| ROUND SQUARE COMMUNICATIONS LIMITED | Private company limited by shares | Live |
| SQUINA COMMUNICATIONS LIMITED | Private company limited by shares | Live |
| Squnavicona Communications Limited | Private company limited by shares | Dissolved |
| AD STAGE COMMUNICATIONS LIMITED | Private company limited by shares | Live |
| STAND COMMUNICATIONS LIMITED | Private company limited by shares | Live |
| STANDARD COMMUNICATIONS LIMITED | Private company limited by shares | Live |
| SKY STAR COMMUNICATIONS COMPANY LIMITED | Private company limited by shares | Dissolved |
| STAR COMMUNICATIONS CO., LIMITED | Private company limited by shares | Live |
| Star Communications (HK) Limited | Private company limited by shares | Live |
| STARBAND COMMUNICATIONS LIMITED | Private company limited by shares | Dissolved |
| STARBRIGHT COMMUNICATIONS LIMITED | Private company limited by shares | Live |
| STAREAST COMMUNICATIONS LIMITED | Private company limited by shares | Live |