| CHOW SANG SANG SECURITIES LIMITED | Private company limited by shares | Live |
| CHOW SANG SANG SECURITIES (HK) LIMITED | Private company limited by shares | Dissolved |
| Sang Sang Online Securities Limited | Private company limited by shares | Live |
| WING SANG SECURITIES COMPANY LIMITED | Private company limited by shares | Dissolved |
| Sansheng Securities Limited | Private company limited by shares | Live |
| SANSTON SECURITIES LIMITED | Private company limited by shares | Dissolved |
| SANTANDER INVESTMENT SECURITIES (HK) LIMITED | Private company limited by shares | Dissolved |
| SARUM SECURITIES LIMITED | Private company limited by shares | Dissolved |
| SASSOON SECURITIES LIMITED | Private company limited by shares | Dissolved |
| SAVOY SECURITIES LIMITED | Private company limited by shares | Dissolved |
| SCORER SECURITIES LIMITED | Private company limited by shares | Dissolved |
| Sky Seal Securities Limited | Private company limited by shares | Live |
| SEALAND SECURITIES (HK) CO., LIMITED | Private company limited by shares | Live |
| SEATTLE SECURITIES LIMITED | Private company limited by shares | Live |
| Second Securities Co., Limited | | Live |
| ASIA SECURITIES SECRETARIES LIMITED | Private company limited by shares | Live |
| SELBORNE SECURITIES LIMITED | Private company limited by shares | Dissolved |
| SELBY SECURITIES LIMITED | Private company limited by shares | Dissolved |
| SELECT SECURITIES LIMITED | Private company limited by shares | Dissolved |
| SELKIRK SECURITIES LIMITED | Private company limited by shares | Dissolved |
| SENATOR SECURITIES CORPORATION (HONG KONG) LIMITED | Private company limited by shares | Dissolved |
| TONG SENG REALTY AND SECURITIES COMPANY LIMITED | Private company limited by shares | Live |
| SENIOR MARKET SECURITIES LIMITED | Private company limited by shares | Dissolved |
| Citadel Securities Asia Services Limited | Private company limited by shares | Live |
| Easy One Securities Consultancy Services Limited | Private company limited by shares | Live |
| Easy One Securities Services Limited | Private company limited by shares | Live |
| Citadel Securities Hong Kong Services Limited | Private company limited by shares | Live |
| JADELING SECURITIES SERVICES LIMITED | Private company limited by shares | Dissolved |
| HSBC SECURITIES SERVICES NOMINEES LIMITED | Private company limited by shares | Live |
| COL NET SECURITIES TRADING SERVICES LIMITED | Private company limited by shares | Dissolved |
| UNIVERSAL SECURITIES AND SERVICES (HK) LIMITED | Private company limited by shares | Dissolved |
| SETRA SECURITIES TRADING LIMITED | Private company limited by shares | Dissolved |
| SECURITIES SETTLEMENT SOLUTIONS LIMITED | Private company limited by shares | Live |
| Seven Star Securities Limited | Private company limited by shares | Live |
| SEYGOW SECURITIES LIMITED | Private company limited by shares | Dissolved |
| S.G. WARBURG SECURITIES ASIA LIMITED | Private company limited by shares | Dissolved |
| Shacom Securities Limited | Private company limited by shares | Live |
| Shanggu Securities Limited | Private company limited by shares | Live |
| SHANGHAI SECURITIES LIMITED | Private company limited by shares | Dissolved |
| Shanghai Securities Co., Limited | Private company limited by shares | Live |
| Shanghai Securities Assets Co., Limited | Private company limited by shares | Live |
| FIRST SHANGHAI SECURITIES LIMITED | Private company limited by shares | Dissolved |
| FIRST SHANGHAI SECURITIES LIMITED | Private company limited by shares | Live |
| ELLEN SHARE SECURITIES LIMITED | Private company limited by shares | Dissolved |
| PO KAY SECURITIES & SHARES COMPANY LIMITED | Private company limited by shares | Live |
| Sharp Securities Limited | Private company limited by shares | Live |
| SHENGJINYUAN SECURITIES LIMITED | | Live |
| SHENWAN HONGYUAN SECURITIES (H.K.) LIMITED | Private company limited by shares | Live |
| HK SHENYIN STRATEGY SECURITIES LIMITED | | Live |
| First ShenZhen Securities Co., Limited | | Live |
| PAK SHING SECURITIES COMPANY LIMITED | Private company limited by shares | Dissolved |
| YUE SHING SECURITIES COMPANY LIMITED | Private company limited by shares | Dissolved |
| SHING ON SECURITIES LIMITED | Private company limited by shares | Dissolved |
| HING SHING SECURITIES LIMITED | Private company limited by shares | Live |
| LEI SHING HONG SECURITIES LIMITED | Private company limited by shares | Live |
| TUNG SHING SECURITIES COMPANY LIMITED | Private company limited by shares | Dissolved |
| Tung Shing Securities (Brokers) Limited | Private company limited by shares | Live |
| Ying Shing Securities Co. Limited | Private company limited by shares | Live |
| SHINING SECURITIES COMPANY LIMITED | Private company limited by shares | Live |
| Two Sigma Securities HK Limited | Private company limited by shares | Live |
| FIRST SIGN SECURITIES LIMITED | Private company limited by shares | Dissolved |
| CHINA SILK ROAD SECURITIES LIMITED | Private company limited by shares | Live |
| GRAND SILVER SECURITIES LIMITED | Private company limited by shares | Live |
| SILVERBRICKS SECURITIES COMPANY LIMITED | Private company limited by shares | Live |
| Silverlion Securities Limited | Private company limited by shares | Live |
| SINCERE SECURITIES LIMITED | Private company limited by shares | Live |
| DAH SING SECURITIES LIMITED | Private company limited by shares | Live |
| NGAI SING CAPITAL SECURITIES LIMITED | Private company limited by shares | Live |
| Hang Sing China Securities Limited | Private company limited by shares | Live |
| SINO SECURITIES LIMITED | Private company limited by shares | Live |
| SINO YIN SECURITIES LIMITED | Private company limited by shares | Live |
| SINO SECURITIES INTERNATIONAL (CHINA) LIMITED | Private company limited by shares | Live |
| SINO E-TRADE SECURITIES LIMITED | Private company limited by shares | Dissolved |
| SINO HONG KONG SECURITIES LIMITED | Private company limited by shares | Live |
| SINO PACIFIC SECURITIES LIMITED | Private company limited by shares | Live |
| SINO WEALTH SECURITIES LIMITED | Private company limited by shares | Live |
| SINOLINK SECURITIES (HONG KONG) COMPANY LIMITED | Private company limited by shares | Live |
| SINOMAX SECURITIES LIMITED | Private company limited by shares | Live |
| Sinorich Securities Limited | Private company limited by shares | Live |
| FP Sino-Rich Securities & Futures Limited | Private company limited by shares | Live |
| SINOSTATE SECURITIES LIMITED | Private company limited by shares | Live Commenced dormancy on 19-Mar-1996 |
| Sinovation Capital Securities Limited | Private company limited by shares | Live |
| Skyline Securities Limited | | Live |
| SKYWAY SECURITIES LIMITED | Private company limited by shares | Live |
| SKYWAY SECURITIES INVESTMENT LIMITED | Private company limited by shares | Live |
| SMOOTH HARMONY SECURITIES LIMITED | | Live |
| Snowball Securities (Hong Kong) Limited | Private company limited by shares | Live |
| SOEN TAK SECURITIES COMPANY LIMITED | Private company limited by shares | Dissolved |
| SoFi Securities (Hong Kong) Limited | Private company limited by shares | Live |
| Soliton Securities Limited | Private company limited by shares | Live |
| CHO & SONS SECURITIES LIMITED | Private company limited by shares | Dissolved |
| SORRENTO SECURITIES LIMITED | Private company limited by shares | Live |
| SOUTH CAPITAL SECURITIES LIMITED | Private company limited by shares | Live |
| SOUTH OCEAN SECURITIES LIMITED | Private company limited by shares | Live |
| SOUTHEAST ASIA SECURITIES COMPANY LIMITED | Private company limited by shares | Dissolved |
| Southern Securities Company Limited | Private company limited by shares | Live |
| SOVEREIGN SECURITIES LIMITED | Private company limited by shares | Dissolved |
| SPEEDER SECURITIES LIMITED | Private company limited by shares | Dissolved |
| CHINA SPRING SECURITIES LIMITED | Private company limited by shares | Live |
| Life Spring Securities Limited | Private company limited by shares | Live |