| Sudbury Takeaway Ltd | Hospitality | 2023 |
| SUE Knight Books & Talks Limited | Professional & scientific | 1998 |
| Sugu Properties Limited | Real estate | 2024 |
| Sukan & Kirisha Properties Ltd | Real estate | 2022 |
| Suldan Limited | Administrative & support | 2009 |
| Sullivan Applications Ltd | Information & communication | 2018 |
| Sultan Dream Property Ltd | Real estate | 2024 |
| SULTAN786 Ltd | Construction | 2019 |
| Sumeltra Limited | Professional & scientific | 2022 |
| Sumlog Limited | Professional & scientific | 2020 |
| Summer Court RTM Company Limited | Real estate | 2003 |
| Summit Sports Group Ltd | Professional & scientific | 2022 |
| Sun Controls Limited | Administrative & support | 2011 |
| Sun Hardware Mart Ltd | Wholesale & retail | 2015 |
| Sun's Landscaping Limited | Construction | 2022 |
| Sunbeds of Brentwood Ltd | Other services | 2025 |
| Sunbridge Academy Ltd | Education | 2026 |
| Sundarban Tuning Ltd | Wholesale & retail | 2022 |
| Sunfell Services Limited | Professional & scientific | 1980 |
| Sunflower Designs Limited | Construction | 2005 |
| Sunflowerhouse Nursery Limited | Education | 2013 |
| Sunningdale Lodge Maintenance Company (Stonegrove) Limited | Administrative & support | 1975 |
| Sunny Carpets & Flooring Ltd | Construction | 2025 |
| Sunny Nanra House Ltd | Real estate | 2019 |
| Sunny's Convenience Stores Ltd | Wholesale & retail | 2019 |
| Sunset Estates Limited | Real estate | 2005 |
| Sunset House RTM Company Limited | Households | 2010 |
| Sunshine Amalia Ltd | Information & communication | 2022 |
| Sunshine for ALL CIC | Hospitality | 2026 |
| SUNSHINE4 Capital Ltd | Financial services | 2020 |
| Sunstead Construction Ltd | Construction | 2026 |
| Suok Associates Limited | Administrative & support | 2020 |
| Suok Recruitment Agency Limited | Administrative & support | 2022 |
| Supal Limited | Professional & scientific | 2010 |
| Super Bloom Ltd | Professional & scientific | 2019 |
| Super DOT COM Ltd | Information & communication | 2018 |
| Super Kuber Limited | Information & communication | 2024 |
| Super Pizza Edgware Ltd | Hospitality | 2024 |
| Super Protein Ltd | Wholesale & retail | 2025 |
| Super Shop Ltd | Wholesale & retail | 2025 |
| Super Successful Ltd | Financial services | 2018 |
| Superapp Online Ltd | Information & communication | 2025 |
| Supercerebral Ltd | Information & communication | 2010 |
| Superguppy Limited | Information & communication | 2025 |
| Superior Safety Limited | Professional & scientific | 2012 |
| Supperbox Delivery Ltd | Hospitality | 2020 |
| Supply Base Limited | Wholesale & retail | 2025 |
| Supplyline Print Limited | Wholesale & retail | 2000 |
| Supreme Automotive 2019 Ltd | Wholesale & retail | 2024 |
| Supreme Contract Cleaning Limited | Administrative & support | 2012 |
| Supreme Structural Engineering Ltd | Professional & scientific | 2025 |
| Supreme Vehicle Repairs Limited | Wholesale & retail | 1977 |
| Supriya Limited | Professional & scientific | 2009 |
| Sure Stone Build Ltd | Construction | 2025 |
| SURE2LET Property Limited | Real estate | 2009 |
| Surehand Electrical Services Limited | Construction | 2011 |
| Surface Restore Ltd | Administrative & support | 2003 |
| Surgedemy Limited | Wholesale & retail | 1981 |
| Suric Capital LLP | | 2024 |
| Surinamese Melting POT Ltd | Hospitality | 2020 |
| Surion Properties Ltd | Real estate | 2015 |
| Surion Travel Ltd | Hospitality | 2025 |
| SUS Consultancy Limited | Professional & scientific | 2019 |
| Susannah Saary Ltd. | Professional & scientific | 2016 |
| Sushi SA Ltd | Hospitality | 2019 |
| Sushico Ltd | Hospitality | 2022 |
| Sussex Wholesales Limited | | 2006 |
| Sustainx Ltd | Wholesale & retail | 2026 |
| Sutton Arab Scents Limited | Wholesale & retail | 2024 |
| Suwa Retail Ltd | Wholesale & retail | 2014 |
| Suwish Limited | Hospitality | 2025 |
| Suzu Limited | Hospitality | 2008 |
| SV Building Construction Ltd | Construction | 2019 |
| Svad Ltd | Real estate | 2025 |
| SVT Consultancy Limited | Real estate | 2025 |
| SVT Property Limited | Real estate | 2026 |
| SVV Smart Design and Build Limited | Construction | 2023 |
| Swami Property Limited | Real estate | 2017 |
| Swaminarayan Gurukul UK Ltd | Real estate | 2016 |
| Swaminarayan IT Consultancy Limited | Extraterritorial | 2015 |
| Swan Cafe Ltd | Hospitality | 2026 |
| Swancote Limited | Real estate | 2021 |
| SWATSON3D Design Ltd | Professional & scientific | 2025 |
| Swbo Ltd | Hospitality | 2024 |
| Swed Care Ltd | Administrative & support | 2016 |
| Sweet AS Candy Limited | Wholesale & retail | 2018 |
| Sweet CUT Ltd | Other services | 2024 |
| Sweet Life Enterprise Ltd | Wholesale & retail | 2009 |
| Sweet Life Holdings Limited | Manufacturing | 2019 |
| Sweet Masala Ltd | Wholesale & retail | 2010 |
| Sweetest Surprise Limited | Other services | 2025 |
| Swerdna Services Limited | Construction | 2007 |
| Swift Cars Auto Ltd | Wholesale & retail | 2024 |
| Swiftfix Mobile Mechanics Ltd | Wholesale & retail | 2025 |
| Swim LAB Limited | Arts & recreation | 2020 |
| Switch on Light Ltd | Construction | 2018 |
| Swivle Ltd | Information & communication | 2025 |
| Syed Construction & Transport Ltd | Construction | 2026 |
| Syeg Limited | Hospitality | 2025 |
| Symbophonics Ltd | Education | 2025 |