| Systech Global Ltd | Wholesale & retail | 2024 |
| Systematic Consulting Ltd | Information & communication | 2017 |
| Systems Emea Limited | Other services | 2018 |
| SZ Audio Ltd | Wholesale & retail | 2016 |
| SZ Management Solutions Ltd | Transport & logistics | 2022 |
| Szora Ltd | Professional & scientific | 2026 |
| Sztygtrans Ltd | Transport & logistics | 2022 |
| T & G Paye Limited | Professional & scientific | 2025 |
| T & M Security Ltd | Administrative & support | 2025 |
| T & Tidy Gardening Services Ltd | Administrative & support | 2023 |
| T a & Sons Properties Ltd | Real estate | 2017 |
| T and J Services Ltd | Transport & logistics | 2018 |
| T and T Global Services Ltd | Wholesale & retail | 2026 |
| T Anveer & Sons Ltd | Transport & logistics | 2021 |
| T D Data Consultancy Ltd | Information & communication | 2022 |
| T Malik IT Ltd | Information & communication | 2020 |
| T&A Recycling Ltd | Water & waste | 2023 |
| T&Dc PVT Limited | Information & communication | 2021 |
| T&F Trading Ltd | Wholesale & retail | 2024 |
| T&G HO Limited | Professional & scientific | 2025 |
| T&H Logistics Ltd | Transport & logistics | 2026 |
| T&M Property Projects UK Limited | Real estate | 2019 |
| T&M Spirit Limited | Real estate | 2018 |
| T&S Fastfood Limited | Hospitality | 2018 |
| T&T Empowered Ltd | Financial services | 2024 |
| T&Y Properties Limited | Real estate | 2019 |
| T.F.S. Cargo Services Limited | Transport & logistics | 1982 |
| T.G. Interior Ltd | Construction | 2013 |
| T.H.E. Enterprises Limited | Health & social care | 2017 |
| T.J.S Plasterworks Ltd | Construction | 2011 |
| T5 Estates Ltd | Real estate | 2022 |
| T5 Foods Ltd | Hospitality | 2025 |
| T8ONJ Ltd | Wholesale & retail | 2025 |
| Taaj Homes Limited | Real estate | 2026 |
| Taajenterprizes Limited | Manufacturing | 2020 |
| Taar Technologica Ltd | Information & communication | 2010 |
| TAB Supply Limited | Wholesale & retail | 2025 |
| Tabung Wang Ltd | Real estate | 2025 |
| Tacap Limited | Health & social care | 2024 |
| Tachgo Services Ltd | Information & communication | 2021 |
| Tacman Developers Ltd | Construction | 2023 |
| Tacman Ltd | Real estate | 2024 |
| Tactics Management Ltd | Professional & scientific | 2004 |
| TAG Bull Ltd | Wholesale & retail | 2022 |
| Taganka Ltd | Wholesale & retail | 2025 |
| Tagata Corp UK Limited | Wholesale & retail | 2026 |
| Tagg Transport Ltd | Transport & logistics | 2017 |
| Tahir Medinfo & Pharmacovigilance Consultancy Ltd | Health & social care | 2018 |
| Tahnez Limited | Wholesale & retail | 2026 |
| Tailored Financial Group Limited | Financial services | 2020 |
| Tailormade Journeys Limited | Administrative & support | 2004 |
| Tails and Barks Ltd | Wholesale & retail | 2025 |
| TAJ Couriers UK Ltd | Transport & logistics | 2018 |
| TAJ Kitchen & Bedroom Ltd | Construction | 2025 |
| TAJ Studio Limited | Professional & scientific | 2022 |
| Taka Productions Limited | Administrative & support | 2025 |
| Takashi Ltd | Real estate | 2025 |
| Take Two Rigging Ltd | Construction | 2024 |
| Takhar Construction Ltd | Construction | 2021 |
| Takhar Enterprise Ltd | Real estate | 2024 |
| Taking Control With CBT Limited | Health & social care | 2017 |
| Talal Solutions Ltd | Administrative & support | 2025 |
| Talengene Ltd | Professional & scientific | 2008 |
| Talently Limited | Administrative & support | 2019 |
| Talhah Limited | Hospitality | 2024 |
| Talis Care Limited | Health & social care | 2018 |
| Taliske Limited | Professional & scientific | 2010 |
| Talks & Talks Technologies Ltd | Information & communication | 2024 |
| Talli Limited | Construction | 2024 |
| Talwar Caterers Limited | Hospitality | 2024 |
| Tamber Solutions Ltd | Transport & logistics | 2013 |
| Tamer Corporation Ltd | Health & social care | 2016 |
| Tampunj IT Ltd | Information & communication | 2013 |
| TAN Butt Consultancy Ltd | Professional & scientific | 2026 |
| TAN Butt Properties Ltd | Real estate | 2025 |
| Tandmeat Limited | Real estate | 2026 |
| Tandom Estates Ltd | Real estate | 2022 |
| Tandoori Kulcha Ltd | Extraterritorial | 2019 |
| Tandoorihub Ltd | Hospitality | 2024 |
| Tandsten Ltd | Financial services | 2025 |
| Tangent Quadrant Ltd | Information & communication | 2016 |
| Tango'D Limited | Health & social care | 2020 |
| Tani West Brom Ltd | Wholesale & retail | 2017 |
| Tanning & Beauty Lounge (Burnham) Ltd | Other services | 2024 |
| Tanvir Singh Ltd | Transport & logistics | 2024 |
| Tanz Consultancy Ltd | Administrative & support | 2025 |
| TAP Start-Up Ltd | Professional & scientific | 2024 |
| Taplow Enterprises Ltd | Wholesale & retail | 2023 |
| Taplow Plumbing & Heating Ltd | Administrative & support | 2015 |
| Tapout Ltd | Information & communication | 2018 |
| Taps ( Slough ) Ltd | Wholesale & retail | 2018 |
| Tapton Care Limited | Health & social care | 2015 |
| Tapton Estates Limited | Financial services | 1950 |
| Tapton Holdings Limited | Professional & scientific | 2001 |
| Tapton Properties Ltd | Real estate | 1989 |
| Taqdeer Builders Ltd | Construction | 2024 |
| Tara GAS Heating Services Limited | Construction | 2013 |
| Taran Star Services Ltd | Transport & logistics | 2012 |
| Tarantula.Net Limited | Information & communication | 1997 |
| Taranveer Properties Ltd | Real estate | 2026 |