| Tenable Business Support Services Limited | Professional & scientific | 2009 |
| Tenable Solutions Ltd | Professional & scientific | 2008 |
| Tenant Helpline Ltd | Other services | 2021 |
| Tenants Limited | Real estate | 2019 |
| Tenbric Ltd | Information & communication | 2025 |
| TENDER4 Ltd | Information & communication | 2017 |
| Tendersnap Limited | Information & communication | 2025 |
| TEO Nails Artist Ltd | Other services | 2025 |
| Teresita Couture UK Ltd | Wholesale & retail | 2025 |
| Terminal One Limited | Financial services | 2018 |
| Termrim Construction Limited | Construction | 1976 |
| Terra Afrika Foods Limited | Wholesale & retail | 2026 |
| Terra Firma Lawns Ltd | Other services | 2019 |
| Terra Firma Twickenham Ltd | Other services | 2020 |
| Terra Productions Ltd | Information & communication | 2024 |
| Terracore Consulting Ltd | Administrative & support | 2026 |
| Terrafive Limited | Professional & scientific | 2024 |
| Terrain Films Limited | Information & communication | 2019 |
| Terry Brook Electrical Services Ltd | Construction | 2015 |
| Terry Holdings (Horbury) Limited | Professional & scientific | 1939 |
| Test 360 Limited | Information & communication | 2014 |
| Tetlow Autos Ltd | Professional & scientific | 2023 |
| TEX Tech Industries (UK) Holdings Ltd | Professional & scientific | 2008 |
| TEX Tech Industries (UK) Ltd | Manufacturing | 2005 |
| Texcellent Deco Ltd | Wholesale & retail | 2021 |
| Texglo Limited | Real estate | 2020 |
| Texwell Ltd | Real estate | 2023 |
| TF Utilities Ltd | Construction | 2024 |
| TGB Property Ltd | Real estate | 2022 |
| TGC Bidco Limited | Wholesale & retail | 2023 |
| TGD365 Ltd | Wholesale & retail | 2025 |
| TH Building Management Limited | Real estate | 2024 |
| TH Joinery Limited | Construction | 2024 |
| TH Professional Ltd | Health & social care | 2019 |
| TH Rope Access Limited | Construction | 2018 |
| TH3M Architects Limited | Professional & scientific | 2017 |
| Thai Sakon Limited | Hospitality | 2005 |
| Thalma Linthwaite Limited | Hospitality | 2019 |
| Thalpos Homes Limited | Real estate | 2026 |
| Thames Valley Projects Limited | Construction | 2010 |
| Thanon Thai Street Food Ltd | Hospitality | 2018 |
| That Carpet Tile Company Ltd | Construction | 2018 |
| That Friendly GUY Ltd | Information & communication | 2023 |
| THE Acorn Capital Fund | Extraterritorial | 2002 |
| THE Akeman Clinic Limited | Other services | 2017 |
| THE Alternative Tackle Collective Limited | Other services | 2024 |
| THE Animal ARK (Yorkshire) Ltd | Wholesale & retail | 2025 |
| THE Animal EYE GUY Ltd | Professional & scientific | 2023 |
| THE Appliance GUY Ltd | Wholesale & retail | 2024 |
| THE ARC Edit Ltd | Wholesale & retail | 2025 |
| THE Architects Workshop Limited | Professional & scientific | 2012 |
| THE Art Room, Denby Dale CIC | Education | 2023 |
| THE Artificial Flower House Limited | Professional & scientific | 2013 |
| THE Aura Archive Ltd | Wholesale & retail | 2026 |
| THE Avaron Group Ltd | Financial services | 2026 |
| THE Aven Training Partnership Ltd | Education | 2015 |
| THE BA Practice Limited | Information & communication | 2015 |
| THE Bagden Group Limited | Hospitality | 2016 |
| THE Barefoot Office Limited | Professional & scientific | 2019 |
| THE Barvenders Choice Limited | Wholesale & retail | 2026 |
| THE Base Day Centre Limited | Health & social care | 2016 |
| THE Beat-Herder Limited | Administrative & support | 2006 |
| THE Beatriarchy Ltd. | Other services | 2023 |
| THE Beauty Mill (Huddersfield) Ltd | Other services | 2021 |
| THE Beauty Room by Sufia Limited | Other services | 2019 |
| THE BED Store Ltd | Manufacturing | 2019 |
| THE Beekeeper (Hillsborough) Ltd | Hospitality | 2022 |
| THE Believers Anchorage Ministry Ltd | Other services | 2024 |
| THE Belong Group Limited | Real estate | 2020 |
| THE Best Greek Limited | Hospitality | 2024 |
| THE Bexley Group Limited | Professional & scientific | 2019 |
| THE Big 6IX Ltd | Information & communication | 2023 |
| THE Big Property Sale Limited | Professional & scientific | 2007 |
| THE Black Fleet Ltd | Information & communication | 2011 |
| THE Blackfriar Estate Limited | Real estate | 2020 |
| THE Blind Tiger WY Ltd | Hospitality | 2026 |
| THE Body Doctor Limited | Manufacturing | 2012 |
| THE Body Double Limited | Extraterritorial | 2012 |
| THE Boiler Company Ltd | Construction | 2014 |
| THE Boss Cuts Eland Ltd | Other services | 2026 |
| THE Brereton Lounge Ltd | Wholesale & retail | 2017 |
| THE Brickworks Huddersfield Limited | Hospitality | 2022 |
| THE Bridge Cafe and Bistro Ltd | Hospitality | 2024 |
| THE Britto Healthcare Group Ltd | Financial services | 2014 |
| THE Brow Lady Ltd | Other services | 2022 |
| THE Buddy Bear Company Limited | Professional & scientific | 2017 |
| THE Burds Properties Ltd | Real estate | 2026 |
| THE Burger Reviews Limited | Information & communication | 2024 |
| THE Business Bureau Ltd. | Professional & scientific | 2012 |
| THE Cabin HD8 CIC | Health & social care | 2022 |
| THE CAN MAN Ltd | Wholesale & retail | 2018 |
| THE Canine Dietitian Limited | Other services | 2020 |
| THE Car Suite Ltd | Wholesale & retail | 2018 |
| THE CFL Project Ltd | Agriculture & fishing | 2021 |
| THE Change Foundry Ltd | Professional & scientific | 2026 |
| THE Charles Avenue Management Co. Ltd. | Real estate | 1998 |
| THE Charlesworth Group Worldwide Limited | Professional & scientific | 2001 |
| THE Clay Mill Ltd | Arts & recreation | 2026 |
| THE Clean Group (Yorkshire) Limited | Administrative & support | 2024 |
| THE Clever Fish Recruitment Limited | Administrative & support | 2010 |