| T&L Workforce Group Ltd | Construction | 2026 |
| T&T Property Services Ltd | Information & communication | 2016 |
| T. & Y. Agencies Limited | Wholesale & retail | 2009 |
| T.I. Improvement Ltd | Construction | 2019 |
| T.K Property Management Ltd | Households | 2020 |
| T.M.O Home Renovations Ltd | Construction | 2017 |
| T.S.D. (UK) Limited | Information & communication | 1995 |
| TA Morgans Consulting Ltd | Information & communication | 2015 |
| TA Nails (Dunstable) Ltd | Other services | 2025 |
| Tactical Armoured Consultancy Ltd | Professional & scientific | 2024 |
| Tagore Nallamothu Limited | Wholesale & retail | 2019 |
| Taiworld Ltd Ltd | Health & social care | 2025 |
| Take Five Film Production Insurance Services Ltd | Extraterritorial | 1995 |
| Take Five Special Risks Ltd | Financial services | 1995 |
| TAKETIME2CARE Limited | Health & social care | 2019 |
| Talentswiftly Ltd | Information & communication | 2024 |
| Tall Properties Limited | Administrative & support | 2008 |
| Tamara Boutique Estates Limited | Real estate | 2020 |
| Tamara Healthcare Ltd | Health & social care | 2021 |
| Tamas Trans Ltd | Transport & logistics | 2025 |
| Tamil Kalvisolai Dunstable Limited | Education | 2026 |
| TAN & Go Dunstable Ltd | Other services | 2023 |
| TAN & Go Houghton Ltd | Other services | 2023 |
| Tangent Devices Limited | Information & communication | 2013 |
| Tangled Webb Limited | Hospitality | 1996 |
| Tank Demolition Ltd | Construction | 2024 |
| Tanoga Manufacturing Limited | Manufacturing | 1997 |
| Tantex (UK) Limited | | 1986 |
| Taped HQ Limited | Wholesale & retail | 2020 |
| Target Vehicle Specialists Ltd | Wholesale & retail | 2022 |
| Taste of China 888 Ltd | Hospitality | 2026 |
| Taste of China Yarmouth Ltd | Hospitality | 2026 |
| Taste-Afrik Limited | Hospitality | 2025 |
| Tattenhoe Park Management Limited | Households | 2002 |
| Taught US Ltd. | Information & communication | 2017 |
| Tax Plan Corp Ltd | Professional & scientific | 2025 |
| Taxapex Ltd | Professional & scientific | 2026 |
| Taxdom Ltd | Professional & scientific | 2020 |
| Taylor Blake Ltd | Construction | 2026 |
| Taylor Made Plumbing Heating & GAS Limited | Construction | 2020 |
| Taylors Fleet Solutions Ltd | Transport & logistics | 2023 |
| TB Powertec Ltd | Information & communication | 2005 |
| TBR & Wellness Limited | Administrative & support | 2024 |
| Tctserv Ltd | Transport & logistics | 2012 |
| TD & X Flooring Ltd | Construction | 2012 |
| TDC Garage Services Limited | Wholesale & retail | 2014 |
| TDK Crown Limited | Health & social care | 2015 |
| Tdmc Ltd | Construction | 2018 |
| TDW Building Services Limited | Construction | 2016 |
| Teacher App Global Ltd | Administrative & support | 2025 |
| Teala Limited | Real estate | 2024 |
| TEC Commercial Cleaning Limited | Administrative & support | 2025 |
| Tech 1 Security Solutions Ltd | Administrative & support | 2022 |
| Tech Place Ltd | Wholesale & retail | 2024 |
| Techallsolutions Ltd | Information & communication | 2024 |
| Techanix Group Ltd | Information & communication | 2020 |
| Techniq PVT Limited | Wholesale & retail | 2024 |
| Technologent Solutions Ltd | Information & communication | 2024 |
| Technology and Homes Warehouse Ltd | Wholesale & retail | 2023 |
| Teen Bhai Catering Company Limited | Hospitality | 2025 |
| Teenest London Limited | Wholesale & retail | 2025 |
| Teesma Ltd | Health & social care | 2024 |
| Tekcos (Plumbing, Heating & Electrical) Ltd | Construction | 2013 |
| Telemarq Ltd | Information & communication | 2011 |
| Telescope Consultancy Ltd | Professional & scientific | 2021 |
| Telescope Property Services Ltd | Households | 2024 |
| TEN TEN Cars UK Ltd | Wholesale & retail | 2026 |
| Teodor Logistics Limited | Transport & logistics | 2018 |
| Teomar Limited | Construction | 2016 |
| Terminus 10 Limited | Manufacturing | 1988 |
| Terminus 16 Limited | Manufacturing | 1936 |
| Terminus 39 Limited | Manufacturing | 1964 |
| Terminus 40 Limited | Manufacturing | 1983 |
| Terminus 55 Limited | Manufacturing | 1987 |
| Terminus 61 Limited | Manufacturing | 1989 |
| Terminus 65 Limited | Manufacturing | 1952 |
| Termopane Windows Ltd | Construction | 2020 |
| Terry Cook Ltd | Construction | 2021 |
| Terry Jones Roofing Ltd | Construction | 2024 |
| Tetraflex Limited | Manufacturing | 2018 |
| TEW Bros. (Contractors) Limited | Real estate | 1967 |
| TFB Interiors Ltd | Administrative & support | 2020 |
| TFC the Fitness Consultancy Limited | Arts & recreation | 2006 |
| TFI Management & Consulting Ltd | Information & communication | 2023 |
| TFK Fuel Limited | Hospitality | 2017 |
| TGB Treecare Ltd | Agriculture & fishing | 2022 |
| TH Europe Limited | Professional & scientific | 2013 |
| TH Global Capital Advisors Limited | Professional & scientific | 2022 |
| TH Global Mart Ltd | Wholesale & retail | 2024 |
| Thames Property Solutions Limited | Households | 2023 |
| Thames View Limited | Hospitality | 2025 |
| Thanky Properties Ltd | Real estate | 2020 |
| THC Developments Ltd | Construction | 2023 |
| THE 1189808 Foundation | Health & social care | 2020 |
| THE 18 Trucks Ltd | Transport & logistics | 2024 |
| THE Academy of Central Bedfordshire | Education | 2012 |
| THE AL5 Aesthetics Limited | Other services | 2016 |
| THE Alliance Holdings Group Limited | Professional & scientific | 2024 |
| THE American BBQ Company (Europe) Limited | Wholesale & retail | 2011 |
| THE Art of Licensing Limited | Administrative & support | 2006 |