| Stra Trade Ltd | Wholesale & retail | 2024 |
| Strategiclifemastery Ltd | Information & communication | 2020 |
| Strategidata Limited | Information & communication | 2024 |
| Stratton AV Ltd | Information & communication | 2023 |
| Strawberry Hill Fruiterers Limited | Wholesale & retail | 2007 |
| Strawberry Noir Limited | Health & social care | 2016 |
| Strictly Sophisticated Ltd | Arts & recreation | 2025 |
| Strongbox Fitness Ltd | Arts & recreation | 2024 |
| Struqt Project Ltd | Construction | 2020 |
| Studio B.Ea (London) Ltd | Other services | 2021 |
| Studio Bijlani Ltd | Other services | 2017 |
| Study Futures Limited | Professional & scientific | 2025 |
| Studylinkpakistan Ltd | Education | 2025 |
| Studyvisago Ltd | Education | 2024 |
| Stunt Wars Ltd | Administrative & support | 2019 |
| Style My Place Ltd | Construction | 2025 |
| Stylish Furniture Design Ltd | Manufacturing | 2024 |
| Subbaraj Ltd | Real estate | 2024 |
| Subha Group Ltd | Real estate | 2025 |
| Succeed Media Ltd | Information & communication | 2021 |
| Sudosu Ltd | Wholesale & retail | 2025 |
| Suitable Spaces Ltd | Real estate | 2021 |
| Summer Snow Limited | Arts & recreation | 2017 |
| Summerdawn Ltd | Extraterritorial | 2011 |
| Summitdigi Limited | Information & communication | 2017 |
| Sun Mark International Limited | Wholesale & retail | 2020 |
| Sun Mark Limited | Wholesale & retail | 1995 |
| Sun Shore Systems Limited | Manufacturing | 2020 |
| Sun Shore Systems London Limited | Manufacturing | 2024 |
| Sunfield Exports Ltd | Wholesale & retail | 2026 |
| Sunline MOT and Garage Ltd | Wholesale & retail | 2026 |
| Sunny's Convenient Store Limited | Wholesale & retail | 2015 |
| Sunrise Electrical Ltd | Construction | 2020 |
| Super Wholesale Ltd | Hospitality | 2020 |
| Superior Services Construction Limited | Construction | 2018 |
| Supermats Limited | Construction | 2008 |
| Superp Building Construction Ltd | Construction | 2018 |
| Supreme Lanka Express UK Limited | Transport & logistics | 2024 |
| Supreme Wellbeing Ltd | Wholesale & retail | 2019 |
| SUR Cars Ltd | Transport & logistics | 2019 |
| Surbek International Ltd | Financial services | 2024 |
| Surup Beverages Limited | Wholesale & retail | 2025 |
| Surveying Damp Limited | Professional & scientific | 2025 |
| Sussers Limited | Wholesale & retail | 1991 |
| Suthar Company Limited | Hospitality | 2025 |
| Suttons Limited | Real estate | 1969 |
| Svetlin Nikolov Ltd | Other services | 2018 |
| Svma Limited | Wholesale & retail | 2020 |
| SVN Mobile Ltd | Wholesale & retail | 2021 |
| Svraka Ltd | Transport & logistics | 2025 |
| Svrm Ltd | Wholesale & retail | 2025 |
| SVS Bespoke Joinery Ltd | Manufacturing | 2020 |
| Svstravel Ltd | Administrative & support | 2025 |
| Swadilo Khana Limited | Wholesale & retail | 2024 |
| Swallows London Ltd | Transport & logistics | 2022 |
| Swans Event Ltd | Administrative & support | 2019 |
| Swap Consultants Ltd | Other services | 2024 |
| Sweetstarz Limited | Hospitality | 2021 |
| Swift Errand Ltd | Transport & logistics | 2025 |
| Swift Solution Ltd | Extraterritorial | 2023 |
| Swisskott Properties Ltd | Real estate | 2024 |
| Switch Cars Ltd | Wholesale & retail | 2025 |
| SX Lounge Ltd | Hospitality | 2021 |
| Synaptic Financials Limited | Information & communication | 2017 |
| Sync Group Limited | Construction | 2023 |
| Sync Holdings Limited | Real estate | 2026 |
| Sync Supplies Limited | Wholesale & retail | 2025 |
| Synergy Financial Advice Ltd | Financial services | 2023 |
| Syntax Software Limited | Information & communication | 2026 |
| Syria Land Ltd | Wholesale & retail | 2025 |
| Syrianstreet Ltd | Information & communication | 2025 |
| T a Kareem Global Ltd | Construction | 2024 |
| T S Chilled Foods Ltd | Wholesale & retail | 2006 |
| T&F Healthcare Limited | Health & social care | 2017 |
| T&J Estates Ltd | Real estate | 2022 |
| T&J Property Maintenance Ltd | Real estate | 2026 |
| T&K Electric Ltd | Construction | 2013 |
| T&L Installations (UK) Ltd | Construction | 2015 |
| T&R London Ltd | Construction | 2023 |
| T-Key Ltd | Information & communication | 2007 |
| T.B.B. Couriers Ltd | Transport & logistics | 2026 |
| Tabani Consultancy Ltd | Professional & scientific | 2023 |
| TAG Infosys Limited | Information & communication | 2019 |
| Taghavi Limited | Real estate | 2015 |
| Tagris Construction Ltd | Construction | 2019 |
| Taha Ventures Ltd | Professional & scientific | 2025 |
| Tahas Kimti Ltd | Professional & scientific | 2018 |
| Taif LED Electrical and Lighting Materials Limited | Wholesale & retail | 2018 |
| Taila Made Limited | Information & communication | 2025 |
| TAJ Contractor Ltd | Construction | 2025 |
| TAJ Properties (Leeds) Ltd | Real estate | 2025 |
| TAJ Properties London Limited | Real estate | 2017 |
| Takeover Limited | Financial services | 1998 |
| Talent & Creativity Ltd | Administrative & support | 2024 |
| Talentex Ltd | Information & communication | 2004 |
| Tallystone Limited | Real estate | 2016 |
| Tambou Ltd | Wholesale & retail | 2024 |
| Tamem's Hair Specialist Ltd | Other services | 2024 |
| TAN & Co Developments Ltd | Construction | 2026 |
| Tangle & Twist Ltd | Real estate | 2006 |