| Sunsets & Secrets Ltd | Wholesale & retail | 2025 |
| Sunshine Traders PVT Limited | Wholesale & retail | 2018 |
| Super Stays Ltd | Real estate | 2023 |
| Super Vita Ltd | Manufacturing | 2026 |
| Superior Decor UK Ltd | Construction | 2023 |
| Superior Group Construction Limited | Financial services | 2020 |
| Superior Refurbishments UK Limited | Construction | 2010 |
| Superior Specialist Cleaning Limited | Administrative & support | 2020 |
| Superspud Consult Limited | Professional & scientific | 2025 |
| Supreme Adventure Co Limited | Wholesale & retail | 2021 |
| Supreme Bedroom Solutions Limited | Construction | 2016 |
| Supreme Being Fitness Limited | Arts & recreation | 2014 |
| Supreme Drylining Services Ltd | Construction | 2022 |
| Supreme Hill Care Limited | Health & social care | 2017 |
| Supreme SE Ltd | Construction | 2025 |
| Supreme Taping Limited | Construction | 2012 |
| Sureflow Construction Limited | Construction | 2009 |
| Surelight Electrical Contractors Ltd | Construction | 2004 |
| Surface Cutting Technologies Ltd. | Information & communication | 2012 |
| Surface Products Limited | Manufacturing | 1992 |
| Sussex Builders Merchants Limited | Wholesale & retail | 2014 |
| Suta's Construction Group Ltd | Construction | 2008 |
| Sutton Cooling Services Limited | Construction | 2000 |
| Suzzy Homes Ltd | Construction | 2025 |
| Suzzy Ltd | Wholesale & retail | 2024 |
| SV Carpentry Ltd | Construction | 2016 |
| Svalbard Protection Limited | Administrative & support | 2013 |
| Svap Recruitment Ltd | Professional & scientific | 2025 |
| SVC Construction Limited | Construction | 2022 |
| SVC Services Ltd | Construction | 2019 |
| SVG Group One Ltd | Construction | 2025 |
| SW & EW Properties Ltd | Real estate | 2024 |
| Swallow Court (Brentwood) Limited | Households | 2015 |
| Swan Coachworks Limited | Wholesale & retail | 1994 |
| Sweet Images Limited | Information & communication | 1998 |
| Sweetcheeks Cupcakes Limited | Hospitality | 2014 |
| Sweetiegems Confectionery Ltd | Wholesale & retail | 2021 |
| Swift Catering Equipment Limited | Wholesale & retail | 1999 |
| Swift Ductwork Ltd | Other services | 2018 |
| Swift Rise Construction Limited | Construction | 2021 |
| Swimasaurus Swim School Limited | Education | 2022 |
| Swimmania Swim School Limited | Arts & recreation | 2014 |
| Swings and Roundabouts Ltd | Health & social care | 2026 |
| Swish Entertainment Ltd | Administrative & support | 2025 |
| SWP Building Services Ltd | Construction | 2016 |
| Swsm Limited | Professional & scientific | 2019 |
| SX Autos Limited | Wholesale & retail | 2023 |
| SX Decorating Limited | Construction | 2016 |
| SX Heating & Plumbing Suppliers Limited | Wholesale & retail | 2006 |
| SX Maintenance Group Ltd | Construction | 2026 |
| Sycamore Building Services Limited | Construction | 2024 |
| Sycamore View Apartments Limited | Real estate | 2024 |
| Sylak Special Effects Limited | Arts & recreation | 2000 |
| SYLHET2024 Limited | Hospitality | 2025 |
| Sylky Cakes Limited | Manufacturing | 2020 |
| Syllasounds Limited | Information & communication | 2018 |
| Symmetry Consulting Ltd | Professional & scientific | 2023 |
| Syms Automotive Designs Limited | Professional & scientific | 1999 |
| Synbol Listings Ltd | Real estate | 2024 |
| Syndorscientific Limited | Professional & scientific | 2024 |
| Synergy Scaffolding Services Ltd | Construction | 2022 |
| Synergy Sevices Limited | Construction | 2016 |
| Synet H R Ltd | Administrative & support | 2024 |
| Synterna Group Holding Ltd | Information & communication | 2026 |
| Syscura Limited | Information & communication | 2025 |
| Sysmig Ltd | Information & communication | 2014 |
| SZK Traders Ltd | Financial services | 2020 |
| T & C Electrical and Maintenance Ltd | Construction | 2024 |
| T & D Glassworks Limited | Construction | 2007 |
| T & R Interiors Limited | Construction | 2006 |
| T & S Welding Limited | Construction | 2015 |
| T Barton Properties Ltd | Real estate | 2024 |
| T D Glassworks Ltd | Construction | 2017 |
| T Investments Services Ltd | Wholesale & retail | 2017 |
| T J Auto Salvage Limited | Wholesale & retail | 2006 |
| T M L Electrical Limited | Construction | 2016 |
| T Poole Brickwork & Building Contractors Limited | Construction | 2014 |
| T Rielly Consulting Ltd | Professional & scientific | 2021 |
| T S I International Ltd | Administrative & support | 2009 |
| T&C Sparkle Cleaning Services Ltd | Administrative & support | 2024 |
| T&I Wonderland Ltd | Health & social care | 2023 |
| T&J Solution Ltd | Construction | 2023 |
| T&L FM Limited | Construction | 2024 |
| T&P Property and Estate Services Ltd | Real estate | 2026 |
| T&R Fire Protection Limited | Other services | 2017 |
| T&R Properties (U.K) Limited | Real estate | 2021 |
| T'Adelle Ltd | Financial services | 2017 |
| T'S Chicken & Consulting Limited | Hospitality | 2025 |
| T. B. Janes Monumental Mason Limited | Manufacturing | 2016 |
| T. S. M. Autos Ltd | Wholesale & retail | 2013 |
| T.A.D. Contracts Ltd | Construction | 2007 |
| T.Edwards Limited | Construction | 2022 |
| T.L.S Services (U.K) Limited | Administrative & support | 2018 |
| T.Mcg Ltd | Manufacturing | 2021 |
| T.W.O Services Holding Ltd | Financial services | 2019 |
| T.W.O. Services Limited | Administrative & support | 1986 |
| T5D Limited | Hospitality | 2020 |
| T71S Holdings Limited | Financial services | 2020 |
| T7TECH Ltd | Wholesale & retail | 2020 |
| TA Emergence Ltd | Real estate | 2025 |