| Survey Drone Solutions Limited | Extraterritorial | 2021 |
| Sushila Mart Company Limited | Wholesale & retail | 2025 |
| Sussex Business Services Ltd | Professional & scientific | 2020 |
| Sustain Commercial Solar Limited | Energy | 2014 |
| Sustain Solar Limited | Energy | 2011 |
| Sustain UK Holdings Limited | Financial services | 2018 |
| Sutaldy Norris Ltd | Wholesale & retail | 2025 |
| Sutton on Hull Travel Limited | Administrative & support | 2025 |
| Suyin Technology Ltd | Wholesale & retail | 2023 |
| Svara and Oak Ltd | Financial services | 2025 |
| SVS Commerce Ltd | Transport & logistics | 2020 |
| SW Holdings and Ventures Ltd | Professional & scientific | 2026 |
| SW3 Consultants LLP | | 2023 |
| Swag Youth CIC | Education | 2026 |
| Swallow Palm Ltd | Wholesale & retail | 2026 |
| Swan Books Limited | Professional & scientific | 2021 |
| Swan Court Property Management Limited | Hospitality | 2013 |
| Swangfei Ltd | Wholesale & retail | 2025 |
| Swank and Warehousing Ltd | Wholesale & retail | 2026 |
| Swansea Walter Road Ltd | Real estate | 2017 |
| Sweat Brings Change Ltd | Arts & recreation | 2026 |
| Sweep Easy Ltd | Administrative & support | 2026 |
| Sweet Jiajia Media Ltd | Wholesale & retail | 2025 |
| Sweet Mary Jane Ltd | Professional & scientific | 2019 |
| Sweet Night Innovation (UK) Limited | Wholesale & retail | 2023 |
| Sweet Rose Trading Limited | Professional & scientific | 2017 |
| Sweet-Ish Ltd | Wholesale & retail | 2026 |
| Sweetno Sales Ltd | Wholesale & retail | 2019 |
| Swelll Ltd | Administrative & support | 2021 |
| Swifay Limited | Information & communication | 2023 |
| Swift & Bold Security Group Ltd | Administrative & support | 2025 |
| Swift Accountants Ltd | Professional & scientific | 2025 |
| Swift Contractor Group Ltd | Construction | 2021 |
| Swiftcard Global Ltd | Wholesale & retail | 2025 |
| Swifthawk Express Co., Ltd | Wholesale & retail | 2025 |
| Swifthire Partners Ltd | Administrative & support | 2025 |
| Swiftlogistics Flyer Ltd | Wholesale & retail | 2025 |
| Swiftmeow Ltd | Information & communication | 2025 |
| Swiftsell Trade Limited | Wholesale & retail | 2024 |
| Swiftverity Ltd | Wholesale & retail | 2026 |
| Swifty Cart Ltd | Wholesale & retail | 2025 |
| Swifty JH Ltd | Wholesale & retail | 2025 |
| Swifty Social Ltd | Professional & scientific | 2021 |
| Swindon School of English Limited | Education | 2010 |
| Switch GDN Ltd | Construction | 2003 |
| Swordfire Global Limited | Real estate | 2026 |
| Swordfire Limited | Administrative & support | 2020 |
| Swotu Industrial Co., Ltd | Administrative & support | 2021 |
| SWP Services Limited | Wholesale & retail | 2024 |
| SY Group Ltd | Wholesale & retail | 2021 |
| Sycamore Cyber Ltd | Information & communication | 2026 |
| Sydvox Trade Co., Ltd | Wholesale & retail | 2026 |
| Sygt Ltd | Wholesale & retail | 2024 |
| Sylanstrial Fridley Ltd | Wholesale & retail | 2025 |
| Sylvalore Media Limited | Wholesale & retail | 2025 |
| Sylviavintage Ltd | Manufacturing | 2025 |
| Symbian Investments Limited | Real estate | 2023 |
| Syme Design Consultants Ltd | Professional & scientific | 2025 |
| Syncra Trade and Logistics Ltd | Extraterritorial | 2024 |
| Syncx Ltd | Information & communication | 2023 |
| Synergix Ltd | Administrative & support | 2020 |
| Synergy Experiences Ltd | Health & social care | 2024 |
| Synergy International Traders Ltd | Wholesale & retail | 2024 |
| Syniq Ltd | Wholesale & retail | 2025 |
| Synthetic Mind AI Ltd | Professional & scientific | 2026 |
| Synthra Global Limited | Manufacturing | 2018 |
| Syspay Ltd | Professional & scientific | 2008 |
| Sytru Group Ltd | Wholesale & retail | 2025 |
| SZS Bearing Industry Group PTE. Ltd. | Manufacturing | 2025 |
| T & J Hyde Holdings Ltd | Financial services | 2023 |
| T & T Inclusive Care Haven Ltd | Health & social care | 2025 |
| T J Hyde Engineering Ltd | Manufacturing | 2013 |
| T L Whittall Holdings Limited | Financial services | 2025 |
| T L Whittall Limited | Agriculture & fishing | 2001 |
| T Plus Group Ltd | Financial services | 2026 |
| T Smith Glass Ltd | Manufacturing | 2017 |
| T TAN Youyan Limited | Wholesale & retail | 2024 |
| T&J Hyde Properties Ltd | Real estate | 2023 |
| T.A.L Enterprises Ltd. | Wholesale & retail | 2016 |
| T.C. Morgan Construction Ltd | Construction | 2010 |
| T1000 Ltd | Information & communication | 2013 |
| T1ZC Ltd | Extraterritorial | 2023 |
| T2 Software Ltd | Information & communication | 2026 |
| Ta&T Ltd | Wholesale & retail | 2024 |
| Ta-Da Crystal Ltd | Wholesale & retail | 2025 |
| Ta-Dah!! Entertainment Ltd | Arts & recreation | 2015 |
| Tabable Ltd | Information & communication | 2024 |
| Tablera Ltd | Information & communication | 2025 |
| Tacaba Ltd | Wholesale & retail | 2013 |
| Tacnian Limited | Information & communication | 2014 |
| Tadex Ltd | Other services | 2022 |
| Tafuma Limited | Health & social care | 2024 |
| Taggo Travel Ltd | Wholesale & retail | 2026 |
| Tagus Homes Development Ltd | Real estate | 2020 |
| Tahir Mart Limited | Wholesale & retail | 2025 |
| Tahofa LLP | | 2022 |
| Tahsha Group Ltd | Wholesale & retail | 2026 |
| Taicheng Gifts Co., Ltd | Wholesale & retail | 2020 |
| Tailored Estates Ltd | Real estate | 2023 |
| Tailored Perfection Ltd | Wholesale & retail | 2025 |