| Teach-Ict.Com Limited | Education | 2009 |
| Teachingdhi Limited | Professional & scientific | 2007 |
| Team AG UK (Mesa) Ltd | Information & communication | 2025 |
| Team Raggamuffin Ltd | Wholesale & retail | 2022 |
| Team Storey Sport Limited | Arts & recreation | 2009 |
| Team Tweds Limited | Arts & recreation | 2009 |
| Teamlumera Ltd | Information & communication | 2026 |
| Teamo Care Ltd | Health & social care | 2023 |
| Teamwere Ltd | Information & communication | 2022 |
| Teaseled Limited | Manufacturing | 2014 |
| Teatime Invest Ltd | Wholesale & retail | 2007 |
| TEC 41 Limited | Wholesale & retail | 2016 |
| Tech Alliance Group Limited | Financial services | 2018 |
| Tech East Limited | Other services | 2016 |
| Techbeh Limited | Information & communication | 2026 |
| Techistlab Digital Innovations Ltd | Information & communication | 2025 |
| Techno Savvy Ltd | Information & communication | 2011 |
| Techvision Gadget Limited | Wholesale & retail | 2026 |
| Techweave Limited | Wholesale & retail | 2026 |
| Tecksfield & ST Limited | Professional & scientific | 2025 |
| Tectics Ltd | Wholesale & retail | 2020 |
| Tectum Estate Limited | Real estate | 2018 |
| Teddy Construction Ltd | Construction | 2023 |
| Teddytrail Childcare Ltd | Extraterritorial | 2026 |
| Tedla Healthcare Ltd | Wholesale & retail | 2019 |
| Tedla Holdings Ltd | Wholesale & retail | 2023 |
| Tee-Oak Limited | Real estate | 2026 |
| Teeg Limited | Professional & scientific | 2010 |
| Teenage Mental Health Ltd | Professional & scientific | 2018 |
| Teffont Limited | Information & communication | 2025 |
| Tega P.M Services Ltd | Transport & logistics | 2025 |
| Tegwyn Control Solutions Limited | Professional & scientific | 2007 |
| Teiker the Cat Ltd | Wholesale & retail | 2025 |
| Tekaton Properties Ltd | Real estate | 2024 |
| Tekian Technology Limited | Information & communication | 2003 |
| Teko Limited | Wholesale & retail | 2025 |
| Tele Video Health Limited | Health & social care | 2009 |
| Telegraph Hill Investments Ltd | Construction | 2022 |
| Temen Limited | Health & social care | 2016 |
| Temp Staffing Group Ltd | Administrative & support | 2025 |
| Temporary Solutions Ltd | Administrative & support | 2026 |
| Tempriq Ltd | Construction | 2025 |
| TEN MAX Group Ltd | Wholesale & retail | 2024 |
| Tendril Trees Ltd | Agriculture & fishing | 2025 |
| Tendring Exterior Cleaning Ltd | Administrative & support | 2024 |
| Tendring Logs Ltd | Administrative & support | 2024 |
| Tene Building Construction Ltd | Construction | 2026 |
| Tenkor Limited | Hospitality | 2026 |
| Tennial Personnel Ltd | Administrative & support | 2014 |
| TEO Transport Ltd | Transport & logistics | 2023 |
| Teqbot Limited | Wholesale & retail | 2022 |
| TER (UK) Limited | Wholesale & retail | 2012 |
| Terence Cope Building Ltd | Construction | 2014 |
| Teresa ENG Limited | Professional & scientific | 2009 |
| Termidial Ltd | Information & communication | 2025 |
| Tern Media Solutions Limited | Professional & scientific | 2002 |
| Terra-Solar Energy Ltd | Construction | 2023 |
| Terranova UAV Vision Ltd | Construction | 2024 |
| Terrasite Limited | Construction | 2017 |
| Terry Mowles Ltd | Construction | 2012 |
| Teselya Limited | Hospitality | 2023 |
| Tess Howard Limited | Arts & recreation | 2026 |
| Test Valley Support Services Ltd | Administrative & support | 2024 |
| Testing & Certification Belgium Ltd | Professional & scientific | 2026 |
| Testpoint Services Ltd | Energy | 2004 |
| Tethya Limited | Wholesale & retail | 2017 |
| Tetrix Ltd | Administrative & support | 2014 |
| TEX ATC Ltd | Manufacturing | 2007 |
| TEX Group Limited | Professional & scientific | 1946 |
| TEX Plastics Ltd | Manufacturing | 1976 |
| TEY Farm Irrigation Limited | Extraterritorial | 2013 |
| TEY Farm Systems Limited | Agriculture & fishing | 1980 |
| Teya Capital Ltd | Professional & scientific | 2019 |
| Teyu Ltd | Construction | 2025 |
| TFB Design Limited | Manufacturing | 2006 |
| TH Investment Holdings Limited | Administrative & support | 2019 |
| TH Property Consultants Limited | Professional & scientific | 2022 |
| TH Property Holdings Ltd | Administrative & support | 2017 |
| TH Tavener Farming Limited | Agriculture & fishing | 2014 |
| TH UK Bar Limited | Hospitality | 2024 |
| Thajsha Group Limited | Wholesale & retail | 2024 |
| Thakadu Limited | Other services | 2025 |
| Thames Capital Partners Ltd | Administrative & support | 2012 |
| Thames Head Limited | Real estate | 2018 |
| Thames River Homes Limited | Real estate | 2015 |
| Thandos Emporium Ltd | Wholesale & retail | 2024 |
| Thanh HAI Nails Spa Limited | Other services | 2022 |
| That's Brave Limited | Professional & scientific | 2013 |
| THE 1914 Magic Ltd | Information & communication | 2020 |
| THE Accomplisher Limited | Real estate | 2025 |
| THE Agile Workshop Limited | Manufacturing | 2014 |
| THE Archer Recruitment Group Limited | Administrative & support | 2023 |
| THE Arches (Midlands) Ltd | Real estate | 2014 |
| THE ARK of the Lord | Other services | 2011 |
| THE Artisan Smokehouse Limited | Manufacturing | 2010 |
| THE Aspen Centre Limited | Health & social care | 2008 |
| THE Association for Petroleum and Explosives Administration | Professional & scientific | 1988 |
| THE Association of Commons Registration Authorities Limited | Other services | 2006 |
| THE Association of Pet Behaviour Counsellors | Other services | 2014 |
| THE Athena Programme Limited | Education | 2007 |