| Teknohama Limited | Professional & scientific | 2025 |
| Tekuchi Ltd | Information & communication | 1999 |
| Telairvision Limited | Administrative & support | 2025 |
| Telcoserv UK Ltd | Wholesale & retail | 2016 |
| Tele Imaging Doctors Ltd | Health & social care | 2019 |
| Telecom Online Limited | Information & communication | 1996 |
| Telecom Saver Solutions Limited | Information & communication | 2014 |
| Telecom&It-Solutions Ltd | Construction | 2017 |
| Teleconsult Limited | Health & social care | 2017 |
| Teleconsult X-Ray Solutions Ltd | Health & social care | 2025 |
| Telegence Ltd | Information & communication | 2024 |
| Telephone-Trainers Limited | Information & communication | 2008 |
| Telepixels Limited | Information & communication | 2020 |
| Teletrac Navman (UK) Ltd | Professional & scientific | 1988 |
| Telidos Limited | Wholesale & retail | 2008 |
| Tellex Services Ltd | Information & communication | 2024 |
| Telltale Tots Ltd | Information & communication | 2016 |
| Tellus Environmental Limited | Professional & scientific | 2022 |
| Telnik Holdings Limited | Financial services | 2020 |
| Telnik Roofing Limited | Construction | 2011 |
| Telnik Scaffold Limited | Construction | 2021 |
| TEM Realisations Limited | Wholesale & retail | 2020 |
| Temi Healthcare Services Limited | Health & social care | 2020 |
| Temp Home Limited | Administrative & support | 2022 |
| Tempgunns Limited | Construction | 2011 |
| Templar Engineering Limited | Manufacturing | 2015 |
| Tempo International Limited | Wholesale & retail | 2008 |
| TEMPO3 Ltd | Information & communication | 2025 |
| Tempsford Building Limited | Real estate | 2014 |
| TEN Accountants Limited | Professional & scientific | 2014 |
| Ten-X Property Limited | Real estate | 2019 |
| Tenacite Ltd. | Education | 2022 |
| Tenacity International Ltd | Arts & recreation | 2024 |
| Tend Retail Limited | Wholesale & retail | 2020 |
| Tenda Wema Investments Limited | Real estate | 2020 |
| Tendai Annah Works Ltd | Information & communication | 2026 |
| Tender Angels Care Limited | Health & social care | 2022 |
| Tender Leaf Clinic Limited | Health & social care | 2018 |
| Tender Touch Hair Studio Limited | Other services | 2014 |
| Tender Touch Homes Limited | Real estate | 2021 |
| Tenderpath Care Limited | Wholesale & retail | 2008 |
| Tennis Works Limited | Education | 2000 |
| Tensabarrier Limited | Extraterritorial | 2000 |
| Tensator Group Limited | Professional & scientific | 2001 |
| Tensator Holdings Ltd | Financial services | 2008 |
| Tensator Limited | Manufacturing | 2000 |
| Tentdemo Solutions Limited | Professional & scientific | 2026 |
| Tentejtay International Company Limited | Health & social care | 2020 |
| Tenythomas Ltd | Health & social care | 2026 |
| Tenzanite Limited | Health & social care | 2022 |
| TEO Installations Ltd | Construction | 2021 |
| Teom Consulting Services Limited | Information & communication | 2013 |
| Tera 13 Ltd | Wholesale & retail | 2021 |
| Tera Solutions Ltd | Manufacturing | 2022 |
| Tera Transport Ltd | Transport & logistics | 2025 |
| Teragence Ltd | Information & communication | 2014 |
| Terex European Financing Company Limited | Financial services | 2024 |
| Terex Financial Services Europe Limited | Financial services | 2003 |
| Terex International Holdings 1 Limited | Financial services | 2018 |
| Terex International Holdings 2 Limited | Financial services | 2018 |
| Tero Sports Ltd | Wholesale & retail | 2014 |
| Terra Contractors Ltd | Administrative & support | 2026 |
| Terra Global Solutions Ltd | Professional & scientific | 2021 |
| Terra Groundwork & Civil Engineering Ltd | Construction | 2023 |
| Terra Nova Properties Ltd | Real estate | 2025 |
| TERRA321 Ltd | Transport & logistics | 2026 |
| Terrace & Oakley Properties Ltd | Real estate | 2022 |
| Terrazzo UK Plus Limited | Construction | 2020 |
| Terri and Hayley Coaching Ltd | Health & social care | 2026 |
| Terry Stuart Limited | Professional & scientific | 2011 |
| Tesa UK Ltd | Manufacturing | 1965 |
| Teshie Grillz Ltd | Hospitality | 2026 |
| Tesl Unlocked Online Ltd | Education | 2025 |
| Test Automation Limited | Information & communication | 2024 |
| Testa Solutions Limited | Professional & scientific | 2017 |
| Testapp Limited | Information & communication | 2015 |
| Testbed Studio Limited | Professional & scientific | 2023 |
| Testcraft IT Solutions Ltd | Information & communication | 2024 |
| Testimony Catering Services Limited | Hospitality | 2017 |
| Testing 789 Ltd | Information & communication | 2011 |
| Testing Inspection Consultancy Limited | Administrative & support | 2008 |
| Tethpope Enterprises Ltd | Wholesale & retail | 2019 |
| Tetlink Ltd | Information & communication | 2024 |
| Tetrachromic Limited | Professional & scientific | 2024 |
| Tetrahedron Housing Limited | Real estate | 2020 |
| Tetteh's Health Care Service Limited | Public administration | 2022 |
| Teuo Ltd | Transport & logistics | 2023 |
| TEX8N Polo Limited | Arts & recreation | 2018 |
| Textile Decor Finishing Limited | Manufacturing | 2025 |
| Textiletrove Limited | Wholesale & retail | 2024 |
| TEZ Property Services Ltd | Households | 2018 |
| Tezen Ecom Ltd | Wholesale & retail | 2021 |
| Tezen Logistics Ltd | Transport & logistics | 2021 |
| Tfb's Bodyshop Ltd | Wholesale & retail | 2017 |
| Tfbg Limited | Professional & scientific | 2013 |
| Tfdd Services Limited | Administrative & support | 2024 |
| TFJ Ltd | Information & communication | 1994 |
| TFS MK Ltd | Construction | 2026 |
| TFY Kent Limited | Administrative & support | 2021 |
| TG Connect Online Ltd | Wholesale & retail | 2025 |