| SR2 Renewables Ltd | Construction | 2023 |
| SS Trade Supplies Limited | Wholesale & retail | 2025 |
| ST. James Group (England) Ltd | Financial services | 2021 |
| Stanton Belting Limited | Professional & scientific | 1999 |
| Stanton CAD Services Ltd | Administrative & support | 2014 |
| Stanton I.T. Limited | Administrative & support | 2009 |
| STB Resin Floors Limited | Construction | 2021 |
| Steve Batty Joinery Limited | Construction | 2013 |
| Steve Slates Ltd | Wholesale & retail | 2015 |
| Stewart Dermatology Limited | Health & social care | 2016 |
| Stick UP Media Limited | Other services | 2022 |
| Stiebel Eltron UK Limited | Manufacturing | 2007 |
| Stormer Limited | Administrative & support | 2013 |
| Strebor Site Services Ltd | Professional & scientific | 2025 |
| Streetlayer Ltd | Administrative & support | 2025 |
| Striders Dog Services Ltd | Agriculture & fishing | 2018 |
| Structensor Consulting Ltd | Professional & scientific | 2021 |
| Studio 16A Ltd | Professional & scientific | 2020 |
| Studio Supra Ltd | Professional & scientific | 2024 |
| Summit Heavy Lift Consultants Ltd. | Professional & scientific | 2022 |
| Supero Finance Limited | Financial services | 2020 |
| Support 2 Independence | Real estate | 2011 |
| Support Force Limited | Information & communication | 2018 |
| SVV Technologies Ltd | Information & communication | 2005 |
| Swamac Quality & Management Services Limited | Professional & scientific | 2026 |
| Swan I. T. Consultants Limited | Administrative & support | 2009 |
| Sydgrows Limited | Other services | 2022 |
| T & G Holding Limited | Administrative & support | 2014 |
| T and T Medical Services Ltd | Health & social care | 2014 |
| T.M.Carruthers Limited | Information & communication | 2017 |
| TACKSHOP4U.CO.UK Ltd | Wholesale & retail | 2013 |
| Tailored-Tlc Limited | Health & social care | 2017 |
| Tamar Site Services Limited | Administrative & support | 2018 |
| Tambco Limited | Financial services | 2023 |
| Taylored Projects Limited | Professional & scientific | 2007 |
| TBS (Wirral) Limited | Administrative & support | 2012 |
| Techmb Ltd | Information & communication | 2024 |
| Technical Waterproofing Limited | Construction | 2017 |
| Technorealm Limited | Administrative & support | 1986 |
| TEE Junction Limited | Wholesale & retail | 2026 |
| TEN TEN Properties Limited | Real estate | 2007 |
| Thara Therapeutic Ltd | Other services | 2025 |
| THE Automatic Door Company Limited | Construction | 2002 |
| THE Awareness Partnership Ltd | Professional & scientific | 2024 |
| THE Chiro Clinic Limited | Health & social care | 2013 |
| THE Eco Paper Straw Company Ltd. | Manufacturing | 2018 |
| THE Eyeworks (Three) Limited | Wholesale & retail | 2002 |
| THE Eyeworks (UK) Limited | Wholesale & retail | 1997 |
| THE Fruit and VEG MAN (Express) Ltd | Wholesale & retail | 2026 |
| THE Fruit and VEG MAN (Franchising) Ltd | Other services | 2022 |
| THE Fruit and VEG MAN Ltd | Wholesale & retail | 2020 |
| THE Fruit and VEG MAN Watford Ltd | Wholesale & retail | 2025 |
| THE Generator Specialists Limited | Manufacturing | 2019 |
| THE Golden Cask Co Ltd | Hospitality | 2023 |
| THE Hexagonal House Ltd | Professional & scientific | 2022 |
| THE Klik Group Limited | Wholesale & retail | 2019 |
| THE Lawnmower Company Limited | Wholesale & retail | 2011 |
| THE Nook (New Brighton) Limited | Hospitality | 2025 |
| THE Oxton Ferns Limited | Administrative & support | 2019 |
| THE Smorgasbord Limited | Hospitality | 2014 |
| THE Steel Gallery Limited | Wholesale & retail | 2021 |
| THE Surrey Script Doctor Ltd | Administrative & support | 2025 |
| THE Wood Flooring Company (UK) Ltd | Administrative & support | 2014 |
| Thegamedirector Ltd | Professional & scientific | 2024 |
| Thurbon-Myers Limited | Hospitality | 2019 |
| Titan Monadics Ltd | Information & communication | 2026 |
| TJ Energy Ltd | Administrative & support | 2025 |
| TJ/H2B Analytical Services, Limited | Extraterritorial | 2001 |
| TMD Management Systems Limited | Administrative & support | 2015 |
| Tmtd Services Limited | Administrative & support | 2011 |
| Tomlinson Electrical (NW) Limited | Construction | 2014 |
| Tontri Design Limited | Administrative & support | 2007 |
| Tony Almond Limited | Wholesale & retail | 1995 |
| Top Tier Drivers Ltd | Administrative & support | 2025 |
| Total Automation and Control Limited | Professional & scientific | 2019 |
| TR LAU Medical Limited | Health & social care | 2020 |
| Trade Direct Windows (NW) Ltd | Manufacturing | 2017 |
| Trade Outlet Limited | Wholesale & retail | 2023 |
| Tripledot Mortgages Ltd | Financial services | 2019 |
| Truedose Technologies Ltd | Manufacturing | 2014 |
| Truss UK Limited | Administrative & support | 2009 |
| Turner Dooley Limited | Real estate | 2022 |
| U Coach Ltd | Arts & recreation | 2009 |
| U V Games Ltd | Professional & scientific | 2014 |
| UK Atlantis Removals Limited | Transport & logistics | 2025 |
| UK Timber Systems Ltd | Construction | 2022 |
| UKI Financial Planning Limited | Financial services | 2011 |
| Ultimate Trim Ltd | Manufacturing | 2019 |
| Ultimate Yoga Limited | Extraterritorial | 2020 |
| Ultimate YOGA8 Limited | Education | 2020 |
| Ultra Bulkheads Ltd | Manufacturing | 2024 |
| Ultra Metalcraft Ltd | Manufacturing | 2021 |
| Ultromex Innovations Limited | Water & waste | 2018 |
| Universal Taekwondo Academies LLP | | 2020 |
| Universal Test Solutions Ltd | Information & communication | 2015 |
| Unrivalled Solutions Limited | Construction | 2022 |
| Upendo Property Limited | Real estate | 2022 |
| Upstream Projects Limited | Administrative & support | 2013 |
| Uptide Group Limited | Information & communication | 2014 |
| Urban Management (UK) Limited | Real estate | 2006 |