| Sun LEE Takeaway Limited | Hospitality | 2007 |
| Sun Tong CO15 Ltd | Hospitality | 2019 |
| Sunbird Consulting Ltd | Professional & scientific | 2023 |
| Suncrop Burstwick Generation Limited | Agriculture & fishing | 2024 |
| Suncrop New Generation Limited | Agriculture & fishing | 2024 |
| Sunday Marmalade Limited | Wholesale & retail | 2025 |
| Sundek Property Services Limited | Real estate | 1999 |
| Sunflower Care Ltd | Real estate | 1998 |
| Sunflower Investments Limited | Construction | 1999 |
| Sungate MOT Test Centre Limited | Wholesale & retail | 2001 |
| Sunlit Energy Limited | Construction | 2024 |
| Sunny Melody Entertainment Limited | Information & communication | 2017 |
| Sunscape Lanka Travels UK Limited | Administrative & support | 2025 |
| Sunset Lodge Ltd | Hospitality | 2021 |
| Super E-Mart Ltd | Wholesale & retail | 2025 |
| Super Restaurants Limited | Hospitality | 1986 |
| Supercash Limited | Hospitality | 2017 |
| Superior Food Products (Essex) Limited | Manufacturing | 1996 |
| Superior Food Products (UK) Limited | Professional & scientific | 2003 |
| Superior Property Services Ltd | Real estate | 1999 |
| Superkomm Ltd | Wholesale & retail | 2021 |
| Supersoft Ltd | Information & communication | 1985 |
| Supply Chain Relationships Limited | Professional & scientific | 1984 |
| Supplyzen Wholesale Ltd | Wholesale & retail | 2025 |
| Support IS Love Ltd | Administrative & support | 2022 |
| Supreme Drapes Limited | Manufacturing | 1977 |
| Supreme Home Improvements Limited | Construction | 2005 |
| Suraj Limited | Professional & scientific | 1992 |
| Sure Legal Ltd | Professional & scientific | 2024 |
| Surelock Security Systems Limited | Administrative & support | 2002 |
| Surrey Fencing and Landscapes Limited | Construction | 2017 |
| Surridge Insulation Services Ltd | Construction | 2020 |
| Surya Investments Ltd | Real estate | 2006 |
| Svani Limited | Wholesale & retail | 1998 |
| Svea Logistics Ltd | Transport & logistics | 2025 |
| SVS Elec Ltd | Construction | 2026 |
| Swaddlers Limited | Water & waste | 1983 |
| Swadesh Bazar Limited | Wholesale & retail | 2024 |
| Swan Creative Limited | Professional & scientific | 1997 |
| Swan Property Consultants Limited | Real estate | 2009 |
| Swanfast Services Limited | Professional & scientific | 2002 |
| Swanvale Industrial Park Management Limited | Professional & scientific | 2006 |
| Swanvale Management Limited | Construction | 2002 |
| Sweet Tanuki Limited | Real estate | 2022 |
| Swfr Ltd | Information & communication | 2013 |
| Swift Consultant Ltd | Professional & scientific | 2023 |
| Swift Mart Enterprises Ltd | Administrative & support | 2025 |
| Swift Recruitment Services Ltd | Administrative & support | 2024 |
| Swiftplan Services Limited | Water & waste | 1984 |
| Swiftshift Medical Services Limited | Health & social care | 2026 |
| SWM (Properties) Limited | Real estate | 1967 |
| SWM (Property Holdings) Limited | Professional & scientific | 2004 |
| Swsl Holdings Limited | Financial services | 2002 |
| SXG Ltd | Wholesale & retail | 2025 |
| Syco Limited | Hospitality | 1983 |
| Syed SA Naqvi Ltd | Wholesale & retail | 2025 |
| Sygn Ltd | Wholesale & retail | 2026 |
| Sylva Emerge Ltd | Education | 2025 |
| Sylverbox Ltd | Health & social care | 2023 |
| Synaworld Ltd | Wholesale & retail | 2025 |
| Syncronetics Limited | Information & communication | 2001 |
| Synergetic Edge Services Ltd | Administrative & support | 2024 |
| Syntech Building Construction Limited | Construction | 2005 |
| Synthomer Overseas Limited | Professional & scientific | 2007 |
| Synthomer PLC | Professional & scientific | 1908 |
| Syraah Ltd | Wholesale & retail | 2024 |
| Systems Design and Marketing Ltd | Wholesale & retail | 2026 |
| T & S Environmental Limited | Water & waste | 2005 |
| T a R S C Limited | Extraterritorial | 1989 |
| T a Rulten Ltd | Health & social care | 2002 |
| T Coyne Brickwork Limited | Construction | 2005 |
| T Dobinson Contracts Limited | Construction | 2007 |
| T F Dental Prosthetics Limited | Health & social care | 2003 |
| T Fanimokun Ltd | Administrative & support | 2006 |
| T I C Finance Limited | Hospitality | 2007 |
| T I Financial Services Limited | Financial services | 2002 |
| T J Training Limited | Education | 2006 |
| T Leland Cladding Limited | Construction | 2007 |
| T M C Haulage Limited | Transport & logistics | 1980 |
| T M Marine Consultancy Limited | Professional & scientific | 2007 |
| T One Technology Ltd | Wholesale & retail | 2025 |
| T W S Windows Limited | Construction | 2004 |
| T&K Coffee Ltd | Hospitality | 2020 |
| T&T Motor Sales Ltd | Wholesale & retail | 2026 |
| T&V Groups Ltd | Real estate | 2025 |
| T. Collins Precision Cutter Grinders Limited | Professional & scientific | 2002 |
| T.A.D. Technologies UK Limited | Professional & scientific | 1998 |
| T.J. Geggus Company Ltd | Construction | 2003 |
| T.J. Mechanical Services Limited | Wholesale & retail | 1988 |
| T.J. Windows Limited | | 1991 |
| T.J.Evers Limited | Construction | 1943 |
| T.J.S. Refrigeration & Air Conditioning Limited | Manufacturing | 2003 |
| T.W. Solutions Limited | Real estate | 2002 |
| TA & Sons Limited | Construction | 2014 |
| Tablabella Limited | Hospitality | 2022 |
| Tablescape & Co Limited | Hospitality | 2026 |
| TAC Surgical Ltd | Manufacturing | 2026 |
| Tadeb Properties Limited | Real estate | 2026 |
| Tafitamos Real Estate Ltd | Real estate | 2023 |
| Taglessnails Ltd | Wholesale & retail | 2024 |