| SUM IT Corporation Limited | Information & communication | 2015 |
| SUMAIRA210 Ltd | Wholesale & retail | 2024 |
| Suman TV Ltd | Information & communication | 2026 |
| Sumba Trading Ltd | Construction | 2024 |
| Summerseat Limited | Wholesale & retail | 2008 |
| Summit Peak Group Limited | Financial services | 2025 |
| Summit Trading Limited | Extraterritorial | 2017 |
| Sumra Healthcare Limited | Health & social care | 2014 |
| Sun House-Staffing Limited | Administrative & support | 2025 |
| Sun Sand and Sea Ltd | Real estate | 2020 |
| Sun UK Developments Ltd | Manufacturing | 2021 |
| Sunmax (UK) Limited | Wholesale & retail | 2005 |
| Sunmeet Enterprise Ltd | Wholesale & retail | 2022 |
| Sunneet Food & Wines Ltd | Wholesale & retail | 2018 |
| Sunny Bargains Ltd | Wholesale & retail | 2024 |
| Sunny Bedrooms & Kitchen Limited | Manufacturing | 2009 |
| Sunny Dawn Limited | Health & social care | 2026 |
| Sunny Days Properties Limited | Real estate | 2017 |
| Sunny Food and Wine Ltd | Wholesale & retail | 2022 |
| Sunny Local Ltd | Wholesale & retail | 2024 |
| Sunny Pure Life UK Ltd | Wholesale & retail | 2018 |
| Sunny Trading London Limited | Wholesale & retail | 2024 |
| Sunny Wine and Food Store Ltd | Wholesale & retail | 2011 |
| Sunnys Construction Limited | Construction | 2025 |
| Sunraj Properties Limited | Real estate | 2019 |
| Sunrise Contacts Ltd | Professional & scientific | 2023 |
| Sunrise Glass & Glazing Ltd | Manufacturing | 2023 |
| Sunrise Radio (London) Ltd | Information & communication | 2009 |
| Sunrise Retro Ltd | Information & communication | 2022 |
| Sunro Properties Ltd | Hospitality | 2021 |
| Sunshine Brothers & Company Limited | Real estate | 2025 |
| Sunshine Children’S Homes Ltd | Health & social care | 2022 |
| Sunshine Gadget Gallery Limited | Wholesale & retail | 2025 |
| Sunshine Island Properties Ltd | Real estate | 2020 |
| Sunshine Play Group Ltd | Health & social care | 2018 |
| Supee Transport Limited | Transport & logistics | 2021 |
| Super Box Ltd | Administrative & support | 2016 |
| Super Car Club Limited | Wholesale & retail | 2011 |
| Super Chai Ltd | Hospitality | 2021 |
| Super Kids Therapist Ltd | Health & social care | 2024 |
| Super Smashers Ltd | Administrative & support | 2017 |
| Super Supply Limited | Wholesale & retail | 2022 |
| Superb Properties Limited | Real estate | 2019 |
| Superpal Estates Ltd | Real estate | 2021 |
| Supper Saver UK Ltd | Professional & scientific | 2024 |
| Supply Centre Ltd | Wholesale & retail | 2024 |
| Supply Masters Ltd | Wholesale & retail | 2023 |
| Support Bubble Ltd | Wholesale & retail | 2020 |
| Supported Pathways Ltd | Real estate | 2026 |
| Suprabath Caterers Ltd | Hospitality | 2016 |
| Supreme Lime and Thyme Ltd | Wholesale & retail | 2023 |
| Supreme Personnel Limited | Administrative & support | 1996 |
| Supreme Real Estate Ltd | Real estate | 2024 |
| Supremeone Estates Limited | Real estate | 2024 |
| Sura Constructions Ltd | Construction | 2026 |
| Surbiton Local Limited | Wholesale & retail | 2022 |
| Sure Heating and Plumbing Ltd | Construction | 2024 |
| Sure Housing Limited | Real estate | 2024 |
| Surforturf Ltd | Hospitality | 2019 |
| Surgitec Limited | Other services | 2016 |
| Suri Realty Ltd | Real estate | 2025 |
| Surrey Hills Carriage Company Limited | Extraterritorial | 2012 |
| Surrey Wines UK Ltd | Wholesale & retail | 2025 |
| SUS Services Limited | Administrative & support | 2026 |
| Susaimo International Limited | Professional & scientific | 2015 |
| Susakri MGR Ltd | Wholesale & retail | 2022 |
| Susegad Nights Ltd | Hospitality | 2025 |
| Sustainat Ltd | Administrative & support | 2022 |
| Sustek Ltd | Construction | 2025 |
| Sutton Real Estates Limited | Real estate | 2025 |
| Suvalaxmi Ltd | Health & social care | 2022 |
| Suvan Ltd | Information & communication | 2026 |
| Suvitha Limited | Information & communication | 2026 |
| SV Electricals Ltd | Construction | 2025 |
| SV Global Ventures Ltd | Real estate | 2020 |
| SV Software Solutions Ltd | Information & communication | 2020 |
| SV Techno Limited | Information & communication | 2020 |
| Svision UK Limited | Information & communication | 2017 |
| SW London Estates Ltd | Real estate | 2020 |
| SW London GAS Services Ltd | Construction | 2016 |
| Swadi Khana Ltd | Hospitality | 2025 |
| Swadin Consultancy Ltd | Professional & scientific | 2024 |
| SWAGGA81 Ltd | Professional & scientific | 2019 |
| Swagwali Ltd | Wholesale & retail | 2026 |
| Swanline Ltd | Administrative & support | 2025 |
| Swaran+Art Ltd | Information & communication | 2022 |
| Sweet Affairs Hounslow Ltd | Hospitality | 2018 |
| Sweet Home Construction Ltd | Construction | 2018 |
| Sweet Palace Ltd | Hospitality | 2014 |
| Sweet Soirée Hounslow Ltd | Hospitality | 2022 |
| Sweet Success Cakes Ltd | Hospitality | 2019 |
| Sweetdreams RO Limited | Administrative & support | 2024 |
| Sweetkom Foods Limited | Hospitality | 2024 |
| Sweetkom Holdings Limited | Real estate | 2020 |
| Sweets&Co Ltd | Wholesale & retail | 2023 |
| Swift 1966 Limited | Administrative & support | 2018 |
| Swift Box Limited | Real estate | 2018 |
| Swift IT Solution Limited | Information & communication | 2024 |
| Swift Office Cleaning Services (Hounslow) Limited | Administrative & support | 1966 |
| Swiftcraft Solutions Ltd | Construction | 2026 |