| THE Watt Group (North East) Limited | Administrative & support | 2019 |
| THE Web Visions Ltd | Information & communication | 2024 |
| THE White Hart at Uttoxeter Limited | Hospitality | 2013 |
| THE Whole Woman Outreach Ltd | Other services | 2024 |
| THE Wild Orchard Fabric Company Ltd | Arts & recreation | 2019 |
| THE Will & LPA Print Co Ltd | Manufacturing | 2025 |
| THE Willows Estate Management Company Limited | Real estate | 2024 |
| THE Wine Reserve Holding Company Ltd | Wholesale & retail | 2015 |
| THE Wine Reserve Ltd | Wholesale & retail | 1996 |
| THE Wisdom Principle CIC | Professional & scientific | 2022 |
| THE Woburn Barber Limited | Other services | 2025 |
| THE Woburn Clinic Ltd | Health & social care | 2024 |
| THE Women's Empowerment Network CIC | Public administration | 2019 |
| THE Woodside Cafe Ltd | Hospitality | 2021 |
| THE Works at Lodge Ltd | Real estate | 2026 |
| THE Worldwide Construction Projects Ltd | Construction | 2016 |
| THE Wright Way in Life Ltd | Wholesale & retail | 2025 |
| THE Wura Rose Group Limited | Real estate | 2023 |
| THE Wyld Group Ltd | Hospitality | 2020 |
| THE Yellow Boys Ltd | Information & communication | 2019 |
| THE Yellow Yoyo Company Ltd. | Administrative & support | 1998 |
| THE Young Visionaries CIC | Education | 2026 |
| Theahc Company Limited | Other services | 2010 |
| Theapril 2ND Ltd | Wholesale & retail | 2020 |
| Theari Property Limited | Hospitality | 2025 |
| Thebawetu Ltd | Information & communication | 2022 |
| Thebloomroom Bletchley Ltd | Wholesale & retail | 2020 |
| Thebpigroup Ltd | Real estate | 2024 |
| Thebutchersdream Ltd | Wholesale & retail | 2021 |
| Thedrinkshop.Com Limited | Wholesale & retail | 1999 |
| Theedit Limited | Information & communication | 2015 |
| Thefactor-Y Ltd | Other services | 2023 |
| Thefreemover Ltd | Other services | 2024 |
| Thegigden Ltd | Arts & recreation | 2025 |
| Theia Estates Limited | Real estate | 2025 |
| Themarketivity Ltd | Professional & scientific | 2026 |
| Themayacare Community Interest Company | Health & social care | 2020 |
| Thenineteenthuk Ltd | Manufacturing | 2026 |
| Theo and Mira Ltd | Wholesale & retail | 2024 |
| THEPLACE2STAY Ltd | Hospitality | 2025 |
| Thepowerwithin Ltd | Wholesale & retail | 2025 |
| Thera-Trainer UK Ltd | Wholesale & retail | 2007 |
| There & Here Ltd | Professional & scientific | 2024 |
| There in Spirit Limited | Information & communication | 2008 |
| Thermal Acoustic Products Limited | Wholesale & retail | 1996 |
| Thermal Improvements Ltd | Other services | 2024 |
| Thermax Europe Limited | Professional & scientific | 1996 |
| Thermotech Plumbing & Heating Services Limited | Construction | 2012 |
| Thermovision Solutions Ltd | Professional & scientific | 2026 |
| Thermphos UK Limited | Manufacturing | 2004 |
| Thesacred Ltd | Manufacturing | 2024 |
| Thetraderguy Ltd | Wholesale & retail | 2023 |
| Thetravelcart Ltd | Administrative & support | 2024 |
| Thevaultproductions Ltd | Information & communication | 2025 |
| Thewellnessway Limited | Wholesale & retail | 2025 |
| Theydon Avenue Limited | Real estate | 1999 |
| Thiarra Belle Ltd | Real estate | 2020 |
| Thideas Labs Ltd | Wholesale & retail | 2025 |
| Thilimag Ltd | Health & social care | 2013 |
| Think Bricks Ltd | Wholesale & retail | 2015 |
| Think Discovery Limited | Professional & scientific | 2024 |
| Think Tattoo Aftercare Ltd | Wholesale & retail | 2018 |
| Thinkbiguk Limited | Professional & scientific | 2020 |
| Thinking Aloud Therapy Limited | Health & social care | 2012 |
| Thinking Objects Limited | Information & communication | 2015 |
| Third EYE Electrical Solutions Ltd | Manufacturing | 2025 |
| Third Party Delivery Associates Limited | Professional & scientific | 2011 |
| Third Party Delivery Group Limited | Professional & scientific | 2011 |
| Third Party Delivery Limited | Professional & scientific | 2005 |
| Thirteen One Fundraising Ltd | Professional & scientific | 2026 |
| This IS My Film Limited | Extraterritorial | 2012 |
| This N That Ltd | Wholesale & retail | 2015 |
| This White Square Ltd | Information & communication | 2025 |
| Thistle Bottling Company Limited | Administrative & support | 2020 |
| Thistle Partners Limited | Professional & scientific | 2013 |
| Thiv Trading Ltd | Wholesale & retail | 2025 |
| Thjs Property Holdings Limited | Financial services | 2016 |
| Thjs Property Limited | Real estate | 2016 |
| Thmove Ltd | Manufacturing | 2009 |
| Thnkproduct Ltd | Professional & scientific | 2017 |
| Thomas Betts & Co Ltd | Construction | 2001 |
| Thomas Betts (Yardley Gobion) Ltd | Real estate | 2021 |
| Thomas Bewick Limited | Wholesale & retail | 2023 |
| Thomas Charles Estate Agents Limited | Real estate | 2020 |
| Thomas Charles Grant Limited | Construction | 1999 |
| Thomas Charles [Bedford] Limited | Real estate | 2002 |
| Thomas Connolly Estate Agents Ltd | Real estate | 2014 |
| Thomas Holdings Limited | Extraterritorial | 1994 |
| Thomas James - Real Estate Ltd | Real estate | 2018 |
| Thomas Maintenance Limited | Professional & scientific | 2023 |
| Thomas Marketing Ltd | Professional & scientific | 2019 |
| Thomas Properties (Bedford) Ltd | Real estate | 2022 |
| Thomas Sands Consulting Limited | Professional & scientific | 2010 |
| Thomas Training Ltd | Professional & scientific | 2026 |
| Thomassells Ltd | Wholesale & retail | 2025 |
| Thompson Balch Limited | Professional & scientific | 2005 |
| Thompson Systems Limited | Professional & scientific | 1995 |
| Thompson TAK Ltd | Wholesale & retail | 2025 |
| Thompsonmoore Ltd | Information & communication | 2020 |
| Thompsons Accountancy Services Limited | Professional & scientific | 2017 |