| Super Car Wash Ltd | Administrative & support | 2026 |
| Super Lofts Limited | Construction | 2015 |
| Super Property Builds Limited | Construction | 2023 |
| Supreme Servicing Estates Ltd | Real estate | 2023 |
| Swift Vehicle Solutions Ltd | Transport & logistics | 2026 |
| Swiftpack Limited | Wholesale & retail | 1996 |
| SY Capital Ltd | Financial services | 2026 |
| T.A Social Care Ltd | Health & social care | 2025 |
| T.H.G. & C.C. Limited | Hospitality | 1988 |
| Talhea Consulting Limited | Professional & scientific | 2012 |
| Taste Catering Co. Limited | Hospitality | 2017 |
| Tcuk Financial Solutions Ltd | Financial services | 2014 |
| TE Outdoor Services Ltd | Water & waste | 2020 |
| Teamworks Management Ltd | Administrative & support | 2010 |
| Tech 1 Electrical Ltd | Construction | 2021 |
| TECH4 IT Services Ltd | Information & communication | 2021 |
| Techno Supplier UK Ltd | Other services | 2025 |
| Techtricks Technological Solutions Limited | Information & communication | 2013 |
| Teedee Property Ltd | Construction | 2019 |
| Teens Unite Fighting Cancer | Health & social care | 2007 |
| TEK1625 Limited | Transport & logistics | 2026 |
| Textured Interiors Ltd | Construction | 2026 |
| That Photo Place Ltd | Wholesale & retail | 2013 |
| THE (W)Right Guide to Accounts Limited | Professional & scientific | 2000 |
| THE Broxbourne School | Education | 2010 |
| THE Christmas Pyjamas Ltd | Wholesale & retail | 2024 |
| THE Conditioning Hub Ltd | Health & social care | 2025 |
| THE Construction Training Partnership Ltd | Education | 2007 |
| THE Consulting Collaborative Ltd | Professional & scientific | 2025 |
| THE Cookie Mail Ltd | Hospitality | 2020 |
| THE Fertility Foundation Property Company Limited | Real estate | 2023 |
| THE Guild of Letting and Management Limited | Education | 2005 |
| THE Heart Centred Riding School Ltd | Education | 2024 |
| THE Joyful Sprout Ltd | Hospitality | 2025 |
| THE K9 Country Club Ltd | Other services | 2025 |
| THE LEE Valley Boat Centre Limited | Transport & logistics | 2002 |
| THE Lookup Group Limited | Information & communication | 2017 |
| THE PAY Day Film Ltd | Information & communication | 2021 |
| THE Planning Consultancy Limited | Construction | 2021 |
| THE Property Presenters Ltd | Professional & scientific | 2019 |
| THE Remedy Works Ltd | Health & social care | 2019 |
| THE SME Management Consultancy Centre Limited | Professional & scientific | 2024 |
| THE Socials XO Ltd | Other services | 2025 |
| THE Tutor (Stem) Frank Davies Limited | Education | 2025 |
| THE Vespers (Barnet) Management Company Limited | Households | 2022 |
| THE White Box Food Company Limited | Hospitality | 2021 |
| THE Woodbine Place Management Company Limited | Real estate | 2018 |
| THE Wright CUT Ltd | Other services | 2023 |
| THE Zoological Society of Hertfordshire Limited | Extraterritorial | 2016 |
| Theydon Priory Management Limited | Households | 1995 |
| Thirteen Artisan Bakery Ltd | Wholesale & retail | 2022 |
| This IS Group Ltd | Construction | 2019 |
| Thompsons Property Holdings Limited | Real estate | 2022 |
| Thornbury House Ltd | Real estate | 2021 |
| Thriving ERA Ltd | Professional & scientific | 2025 |
| Tipple Estates Ltd | Real estate | 2022 |
| Tkeys Music Ltd | Information & communication | 2023 |
| TLK Projects Limited | Hospitality | 2010 |
| TM Refrigeration Ltd | Construction | 2018 |
| Toast Eleven Limited | Professional & scientific | 2006 |
| Tongariki Consulting Ltd | Professional & scientific | 2017 |
| Tonmoore Ltd | Professional & scientific | 2024 |
| TPH1 Holdings Ltd | Real estate | 2025 |
| TRA Ltd | Construction | 2025 |
| Transcribe IT Ltd | Administrative & support | 2022 |
| Travel the World Limited | Administrative & support | 2007 |
| Treeborn Limited | Manufacturing | 2021 |
| Trident Underwriting Limited | Financial services | 2005 |
| Trinity Events & Gifts Limited | Wholesale & retail | 2022 |
| Triple O Consulting Ltd | Real estate | 2017 |
| Triplem Records Ltd | Real estate | 2023 |
| Triumphant Charismatic Gathering Ltd | Other services | 2017 |
| TRK Heating and Services Ltd | Construction | 2023 |
| TSO Property Investments Ltd | Real estate | 2022 |
| Tufting Limited | Wholesale & retail | 2024 |
| Turnford Stores Limited | Other services | 2017 |
| Twice Pictures Limited | Professional & scientific | 2019 |
| Twinsun Estates Limited | Real estate | 2024 |
| Two G Properties Limited | Construction | 2005 |
| Tymlus Limited | Wholesale & retail | 2022 |
| UK Letting Services Ltd | Professional & scientific | 2024 |
| UK Shoot Limited | Information & communication | 2012 |
| UM Ltd | Real estate | 2005 |
| Unicorn Garages Limited | Wholesale & retail | 1985 |
| Unit 12 Kitchen Ltd | Manufacturing | 2020 |
| United Trading Corporation Limited | Financial services | 1969 |
| Universe Holding Group Ltd | Arts & recreation | 2024 |
| Unix Precise Equipment Ltd | Wholesale & retail | 2023 |
| Unrivalled Access Solutions Scaffolding Services Limited | Construction | 2026 |
| Uppower Ltd | Wholesale & retail | 2021 |
| Upton Contracts Ltd | Construction | 2016 |
| Urban Scaffolding Services Limited | Construction | 2023 |
| Urbanhaven Properties Ltd | Real estate | 2025 |
| V.J. Green Limited | Real estate | 1977 |
| V.S.A. Construction Limited | Construction | 2021 |
| Valley Grown Salads | | 2009 |
| Value Addition Ltd | Mining & quarrying | 2025 |
| Value Cars Ltd | Wholesale & retail | 2023 |
| Vancouver 1966 Limited | Extraterritorial | 2013 |
| Vanessa Rose Ltd | Information & communication | 2024 |