| T&G Cars Ltd | Wholesale & retail | 2017 |
| T&J Plastering Ltd | Construction | 2017 |
| T&R Solutions Ltd | Information & communication | 2024 |
| T.Mitchell Plumbing & Bathrooms Ltd | Construction | 2026 |
| T.P. Whitford Transport Services Ltd | Transport & logistics | 2009 |
| T9 Ambulance Service Limited | Education | 2019 |
| Tableka-Group Limited | Transport & logistics | 2025 |
| Tacema Limited | Construction | 2016 |
| TAD Holdings Ltd | Professional & scientific | 2018 |
| TAD Projects Ltd | Administrative & support | 2024 |
| Tadeo Limited | Transport & logistics | 2015 |
| Tagutadr Limited | Health & social care | 2023 |
| Tail & Blush Ltd | Other services | 2026 |
| Tailor Taverns Limited | Households | 2013 |
| Tailored Financial Limited | Financial services | 2022 |
| Tails and Plants Limited | Other services | 2024 |
| Take a Deep Breath CIC | Arts & recreation | 2023 |
| Taknom Youth Residence Ltd | Health & social care | 2014 |
| Tamara Enterprise Limited | Wholesale & retail | 2018 |
| Tamara-Ed Premium Ltd | Wholesale & retail | 2026 |
| Tampographic Services Limited | Wholesale & retail | 1987 |
| Tangmoh Ltd | Other services | 2016 |
| Tania Bosworth Limited | Administrative & support | 2020 |
| Tanimola Ltd | Manufacturing | 2024 |
| Tanmil Ltd | Health & social care | 2022 |
| Tans Transports Ltd | Transport & logistics | 2025 |
| Tantrum Tiara Ltd | Other services | 2019 |
| Taoo Corporation Ltd | Information & communication | 2020 |
| Tape Cloud Solutions Ltd | Professional & scientific | 2025 |
| Tapenesio Healthcare Limited | Wholesale & retail | 2007 |
| Tarek Hajri Limited | Real estate | 2023 |
| Taridzeaux Ltd | Professional & scientific | 2021 |
| Tasty E-Kitchen & Restaurants Ltd | Wholesale & retail | 2025 |
| Tasty Little Things Ltd | Hospitality | 2025 |
| Tasty Peri Peri Ltd | Hospitality | 2024 |
| Taurus Catering Equipment Ltd | Professional & scientific | 2021 |
| Tawa Trading Ltd | Hospitality | 2026 |
| Taylor & Palson Ltd | Wholesale & retail | 2020 |
| Taylor Blevins Brickwork Contractors Limited | Construction | 2017 |
| Taylor Made Pvcu Ltd | Wholesale & retail | 2013 |
| Taylor Technical Services Ltd | Extraterritorial | 2022 |
| TB Building Services Ltd | Construction | 2021 |
| TBJ Delivery’S Ltd | Transport & logistics | 2025 |
| TCB Investments Ltd | Real estate | 2021 |
| TCK Property Services Ltd | Construction | 2024 |
| TCN Carpentry Limited | Construction | 2019 |
| TDH (Northampton) Limited | Transport & logistics | 2014 |
| TDS Consultants Ltd | Professional & scientific | 2019 |
| Teacher Card Ltd | Professional & scientific | 2023 |
| Team Classic Suzuki Limited | Wholesale & retail | 2017 |
| Team Electrical Services Limited | Construction | 1991 |
| Tebmar Ltd | Health & social care | 1999 |
| Tech Pros Mobile & PC Solutions Limited | Wholesale & retail | 2026 |
| Techhq Ltd | Information & communication | 2025 |
| Technical & Development Services (Midlands) Limited | Administrative & support | 2006 |
| Technical & Development Services (Northern) Limited | Administrative & support | 2003 |
| Technical & Development Services (Southern) Limited | Administrative & support | 2004 |
| Technical & Development Services Group Limited | Administrative & support | 2008 |
| Technical & Development Services Holdings Ltd | Administrative & support | 2017 |
| Technical & Development Services Limited | Administrative & support | 2008 |
| Technical & Development Services Partners LLP | | 2012 |
| TEE Services Limited | Administrative & support | 2023 |
| Tehnotrans Ltd | Transport & logistics | 2019 |
| TEK Mechanical Services Ltd | Construction | 2019 |
| Tekk-Tape Limited | Construction | 2012 |
| Tekniti.Ai Ltd | Information & communication | 2023 |
| Telecoms Engineers Ltd | Information & communication | 2021 |
| TEN Degrees of Design Ltd. | Manufacturing | 2017 |
| Tender Support Services Ltd | Health & social care | 2019 |
| Tera Accountancy Ltd | Professional & scientific | 2022 |
| Terbumi Ltd | Transport & logistics | 2026 |
| Terenyi Trans Ltd | Transport & logistics | 2017 |
| Tero Trans Ltd | Transport & logistics | 2013 |
| Terotest Limited | Information & communication | 1983 |
| Terotest Systems Ltd | Information & communication | 2001 |
| Terry Coles Curtains & Blinds Limited | Wholesale & retail | 2009 |
| Terry Pitcher Haulage Limited | Transport & logistics | 2015 |
| Texo Drywall Limited | Construction | 2024 |
| TFP Finance Ltd | Financial services | 2025 |
| TGF Roofing Ltd | Construction | 2025 |
| TGN Project Logistics Ltd | Transport & logistics | 2025 |
| TH Go Services Ltd | Health & social care | 2024 |
| Thakrar Property Limited | Real estate | 2016 |
| Thaliver Ltd | Health & social care | 2023 |
| Thames Road 1968 Limited | Extraterritorial | 2014 |
| Thani Nadan Limited | Wholesale & retail | 2025 |
| That Shouldn'T BE on Fire Ltd | Information & communication | 2025 |
| That’S ALL Right Ltd | Administrative & support | 2025 |
| THE Alternative Logistics Company Limited | Professional & scientific | 2018 |
| THE Andrew Grene Foundation (UK) | Other services | 2010 |
| THE Bait Depot Limited | Real estate | 2016 |
| THE Barber Brothers EST 2020 Limited | Other services | 2020 |
| THE Beauty Consultancy Limited | Professional & scientific | 2021 |
| THE Bespoke WIG Boutique London Ltd | Wholesale & retail | 2022 |
| THE Big Food Group Limited | Wholesale & retail | 1980 |
| THE Big Phat Print Company Ltd | Professional & scientific | 2008 |
| THE Breakfast Barn Limited | Hospitality | 2024 |
| THE British Balloon Museum and Library Limited | Arts & recreation | 1980 |
| THE Bull 37 Ltd | Hospitality | 2025 |
| THE Central Strapping Co. Limited | Manufacturing | 1999 |