| Szymon Ltd | Transport & logistics | 2018 |
| T & a Retails Ltd | Wholesale & retail | 2018 |
| T & B Tradebridge Ltd | Wholesale & retail | 2025 |
| T & G Fabrications Limited | Manufacturing | 2004 |
| T & S Properties Herts Ltd | Real estate | 2017 |
| T & Y Group Ltd | Hospitality | 2026 |
| T a H Industries Limited | Professional & scientific | 2012 |
| T a Transport Limited | Transport & logistics | 2023 |
| T Adam Limited | Construction | 2018 |
| T and B African Foods Limited | Hospitality | 2021 |
| T and S Components Limited | Manufacturing | 2012 |
| T Cars Ltd | Transport & logistics | 2023 |
| T Estates Group Limited | Real estate | 2026 |
| T H Properties (Luton) Ltd | Real estate | 2024 |
| T Heart & Co Jewellers Ltd | Wholesale & retail | 2016 |
| T Heneghan Safety Services Limited | Public administration | 2023 |
| T J Building Services Limited | Construction | 2016 |
| T J Housing Services Limited | Real estate | 2024 |
| T Jellis PA Services Ltd | Administrative & support | 2026 |
| T Khan Consultancy Ltd | Professional & scientific | 2020 |
| T L Properties Limited | Real estate | 1998 |
| T M Akram & Associates Ltd | Professional & scientific | 2023 |
| T Marbel Limited | Professional & scientific | 2015 |
| T N Real Estates Ltd | Real estate | 2022 |
| T Plasters Limited | Manufacturing | 2024 |
| T Props Holdings Limited | Real estate | 2023 |
| T R Infinity Estates Ltd | Real estate | 2024 |
| T Rhino Drives and Patios Ltd | Construction | 2025 |
| T Ride Limited | Transport & logistics | 2022 |
| T Storage & Recovery Ltd | Transport & logistics | 2018 |
| T&A Logistics Limited | Transport & logistics | 2025 |
| T&A Sales Expert Ltd | Wholesale & retail | 2024 |
| T&C Removals Ltd | Transport & logistics | 2023 |
| T&C Trans-Log Limited | Transport & logistics | 2024 |
| T&Cm Consultancy Ltd | Information & communication | 2022 |
| T&K Fresh Food Ltd | Wholesale & retail | 2026 |
| T&K Plough PUB Company Ltd | Hospitality | 2024 |
| T&M Construction Limited | Construction | 2020 |
| T&R Vehicle Collection & Delivery Sevices Limited | Transport & logistics | 2024 |
| T&T Trading Siblings Ltd | Wholesale & retail | 2021 |
| T'Z Desserts Limited | Hospitality | 2023 |
| T. & a. Dunn Developments Ltd | Construction | 1978 |
| T. & E. Neville Limited | Construction | 1940 |
| T. R. Storage Supplies Limited | Construction | 2002 |
| T16AAK Ltd | Transport & logistics | 2019 |
| T4TAR Limited | Professional & scientific | 2024 |
| T4TYRES Ltd | Wholesale & retail | 2025 |
| T9 Electrical Wholesalers Limited | Manufacturing | 2023 |
| TA Consult Ltd | Professional & scientific | 2014 |
| TA Juri Limited | Wholesale & retail | 2020 |
| TA Suppliers Ltd | Wholesale & retail | 2021 |
| TA Universal Company Limited | Other services | 2022 |
| Taag Transport Ltd | Transport & logistics | 2015 |
| Taalam Ltd | Education | 2026 |
| Tabarak Holdings Ltd | Real estate | 2024 |
| Tabassum Limited | Wholesale & retail | 2025 |
| Tabela Ltd | Other services | 2023 |
| Tabi's Cafe Ltd | Hospitality | 2024 |
| Table 21 Limited | Hospitality | 2018 |
| Table 32 Limited | Hospitality | 2025 |
| Tabletop Forge Ltd | Wholesale & retail | 2025 |
| Tabrez Properties Limited | Extraterritorial | 2014 |
| Tabs Hair & Beauty Salon Limited | Other services | 2014 |
| Tabula Rasa Retreats Ltd | Administrative & support | 2020 |
| Tadsan UK Ltd. | Hospitality | 2017 |
| TAF Properties Limited | Real estate | 2007 |
| TAG Development C.I.C. | Other services | 2024 |
| TAG Heating Ltd | Construction | 2021 |
| TAG Maintenance Ltd | Other services | 2019 |
| Tago Properties Ltd | Real estate | 2024 |
| Tago Trans Ltd | Transport & logistics | 2019 |
| Tahareem Farquhar Ltd | Health & social care | 2018 |
| Tahir & Akhtar Holdings Ltd | Real estate | 2026 |
| Tahmid Nextgen Ltd | Professional & scientific | 2026 |
| TAI PAN Luton Ltd | Hospitality | 2025 |
| Taiboa Limited | Information & communication | 2025 |
| Taif Education Consultancy Ltd | Education | 2024 |
| Taijips Ltd | Wholesale & retail | 2026 |
| Tailor Photography Ltd | Professional & scientific | 2013 |
| Tailorlaid Flooring Ltd | Construction | 2025 |
| Taiwasta Ltd | Wholesale & retail | 2023 |
| TAJ Freights Limited | Transport & logistics | 2025 |
| TAJ Renovates Ltd | Construction | 2023 |
| TAJ Traces Enterprises Ltd | Wholesale & retail | 2025 |
| TAK Engineering Ltd | Manufacturing | 2025 |
| Takdir UK Limited | Hospitality | 2007 |
| Take ME Home James Network UK Ltd | Transport & logistics | 2012 |
| Take the Next Step 121 Ltd | Education | 2024 |
| Takepro Limited | Administrative & support | 2017 |
| Tal&Saf Ltd | Public administration | 2025 |
| Talabi M Ltd | Health & social care | 2020 |
| Talent Healthcare Recruitment International Limited | Education | 2019 |
| Talent Match Recruitment Limited | Wholesale & retail | 2024 |
| Talentline Recruitment Ltd | Administrative & support | 2023 |
| Talha Sons Ltd. | Administrative & support | 2023 |
| Talhaaz Ltd | Wholesale & retail | 2023 |
| Talhah Holdings Ltd | Financial services | 2025 |
| TALK4 Communications Ltd | Information & communication | 2009 |
| Talking Elephants Bereavement Services Limited | Other services | 2021 |
| Talking Helpers Ltd | Health & social care | 2019 |