| Taylor Richardson Properties Limited | Real estate | 2003 |
| Taylored Dental Care Limited | Health & social care | 2010 |
| Taylored Holdings Limited | Health & social care | 2014 |
| Taylored HR Solutions Ltd | Professional & scientific | 2022 |
| Taylors Estate Agents Ltd | Professional & scientific | 1991 |
| Taylr Jewellery Ltd | Wholesale & retail | 2025 |
| TB Capital Management Limited | Financial services | 2025 |
| TB Club Ltd | Arts & recreation | 2024 |
| TB Premium Padel Ltd | Construction | 2025 |
| TBG Bright LLP | | 2012 |
| TBG Marketing Limited | Wholesale & retail | 2008 |
| TBT Health & Fitness Limited | Arts & recreation | 2018 |
| TBT Mens Health & Fitness Ltd | Arts & recreation | 2020 |
| TBT Womens Fitness Limited | Arts & recreation | 2019 |
| TC Body Engineering Ltd | Health & social care | 2024 |
| TC Business Limited | Information & communication | 2015 |
| TC Capital Ltd | Real estate | 2020 |
| TC DC Management Limited | Professional & scientific | 2022 |
| TC Planning Limited | Real estate | 2019 |
| TC Scaffolding Ltd | Construction | 2022 |
| TC2 - Technical Consultancy Limited | Professional & scientific | 2019 |
| TCB Systems Ltd | Information & communication | 2022 |
| TCR Group Services Ltd | Administrative & support | 2021 |
| TDH Fine Art Limited | Arts & recreation | 2021 |
| Tea Two Sugars Limited | Construction | 2022 |
| Tea-Pop Ltd | Wholesale & retail | 2016 |
| Team Edge Limited | Manufacturing | 2015 |
| Team UP Sports Limited | Information & communication | 2008 |
| Team Urban Ltd | Real estate | 2019 |
| Teamline Group Limited | Professional & scientific | 2020 |
| Teatime Capital Limited | Financial services | 2023 |
| Tech and Technician Ltd | Wholesale & retail | 2021 |
| Tech Chara Limited | Information & communication | 2017 |
| Tech Insiders Ltd | Information & communication | 2024 |
| Tech REC IT Ltd | Administrative & support | 2014 |
| TECH4 Boys and Girls | Health & social care | 2018 |
| Techcozo Ltd | Information & communication | 2017 |
| Techknowledgey Ltd | Information & communication | 2012 |
| Technical Project Delivery Limited | Administrative & support | 2023 |
| Technifin - Development Projects LLP | | 2020 |
| Technigrowth LP | | 2021 |
| Techno Experts Ltd. | Administrative & support | 2015 |
| Technology Alternatives Limited | Professional & scientific | 2011 |
| Technology Design Limited | Manufacturing | 1995 |
| Technology Lawyer Limited | Administrative & support | 2016 |
| Techridge Limited | Information & communication | 2014 |
| Techserve Consultants Limited | Professional & scientific | 2007 |
| Techtrain (OIL & GAS) Ltd | Mining & quarrying | 2022 |
| Techtraining Limited | Information & communication | 2022 |
| Teck Group Limited | Professional & scientific | 2022 |
| Teckel Limited | Information & communication | 2024 |
| Tecnon Orbichem Ltd | Information & communication | 1976 |
| Tectivo Talent Limited | Administrative & support | 2022 |
| TED Baker Holdings Limited | Financial services | 1997 |
| TED Wellington. Ltd | Professional & scientific | 2023 |
| Teecom Consulting Limited | Information & communication | 2016 |
| Teesside Workspace.Com Ltd | Real estate | 2023 |
| Tegan Architectural Consultants Ltd | Professional & scientific | 2007 |
| Teggart Limited | Professional & scientific | 2013 |
| Teign Cellars Ltd. | Hospitality | 2013 |
| Tejas Properties Limited | Real estate | 2024 |
| Tekgence UK Ltd | Professional & scientific | 2023 |
| Tektopia Ltd | Administrative & support | 2016 |
| Telecoms Acquisition Consultancy Ltd | Information & communication | 2019 |
| Telemacque Consultancy Limited | Professional & scientific | 2024 |
| Telemind Limited | Health & social care | 2022 |
| Telford Bay Limited | Real estate | 2025 |
| Tell Holdings Limited | Real estate | 2017 |
| Temex Limited | Professional & scientific | 2022 |
| Templer Properties Ltd | Real estate | 2019 |
| Templeton Security Consultancy Limited | Professional & scientific | 2022 |
| Tempy Ltd | Administrative & support | 2026 |
| TEN Forward Consulting Limited | Information & communication | 2023 |
| Tenacious IT Limited | Administrative & support | 2021 |
| Tenants Assist Ltd | Administrative & support | 2025 |
| Tenebris Consulting Group Limited | Administrative & support | 2019 |
| Tenement Farm Fraser Homes Limited | Construction | 2022 |
| Tenement Farm Management Company Limited | Households | 2023 |
| Tengar Limited | Health & social care | 2021 |
| Tengo Sports Travel Ltd | Administrative & support | 2025 |
| Tenon BIO Limited | Professional & scientific | 2024 |
| Tenpoint Therapeutics Holding Limited | Financial services | 2024 |
| Tenpoint Therapeutics Limited | Professional & scientific | 2020 |
| Tension Structures Limited | Professional & scientific | 2002 |
| Tensora Holdings Limited | Information & communication | 2024 |
| Tenureswift Property Management Limited | Households | 1994 |
| Teqdis Limited | Information & communication | 2007 |
| Terakoya Education Limited | Education | 2013 |
| Terchemie Consulting Ltd | Professional & scientific | 2018 |
| Teresa Ball International Solidarity Fund | Other services | 2000 |
| Terra Verde Properties Limited | Construction | 2015 |
| Terran Consultancy Limited | Information & communication | 2008 |
| Terranova Media Limited | Professional & scientific | 2023 |
| Terratruck Limited | Wholesale & retail | 2002 |
| Tesgl Limited | Construction | 2013 |
| Testforecast Limited | Information & communication | 2015 |
| Tethera Limited | Information & communication | 2024 |
| Tetsu Ltd | Wholesale & retail | 2022 |
| Texco Ventures (UK) Limited | Wholesale & retail | 2013 |
| Textile Intelligence Limited | Extraterritorial | 1998 |