| TCH Consulting Limited | Professional & scientific | 2014 |
| TCH UK Holdings Limited | Professional & scientific | 2025 |
| TCS Group Limited | Construction | 2015 |
| TCS Screeding Limited | Construction | 2004 |
| TCS SW Limited | Construction | 2026 |
| Tctf Investments Ltd | Real estate | 2022 |
| TE & AA Properties Ltd | Real estate | 2023 |
| TE Medicare Ltd | Health & social care | 2016 |
| Teaching Pro Limited | Education | 2024 |
| Teak & Brown Limited | Other services | 2024 |
| Team Awesome Events Limited | Arts & recreation | 2016 |
| Teastain Theatre CIC | Arts & recreation | 2023 |
| TEC Contracting Group Limited | Professional & scientific | 2008 |
| Tech a Look Ltd | Information & communication | 2026 |
| Tech Fusion Private Limited | Information & communication | 2025 |
| TECH20 Components Limited | Wholesale & retail | 2020 |
| Techmann Limited | Administrative & support | 1983 |
| Technegbe Ltd | Administrative & support | 2019 |
| Technical Ballers Ltd | Other services | 2020 |
| Technical Global Solutions Ltd | Administrative & support | 2021 |
| Techno Geek Solutions Ltd | Information & communication | 2016 |
| Techno Watch Ltd | Other services | 2021 |
| Technocap Ltd | Professional & scientific | 2011 |
| Technology Risk & Controls Consulting Limited | Construction | 2017 |
| Technoserve International Inc | | 1989 |
| Technoventures Limited | Information & communication | 2010 |
| Techruiter Contracts Ltd | Information & communication | 2022 |
| Techruiter Group Ltd | Information & communication | 2022 |
| Techruiter Labs Ltd | Information & communication | 2022 |
| Techwise Consulting Limited | Administrative & support | 2010 |
| Teckleap Ltd | Information & communication | 2025 |
| Tecpac Limited | Manufacturing | 2007 |
| Teemaz Ltd | Wholesale & retail | 2024 |
| Teemazz Ltd | Wholesale & retail | 2023 |
| Teje PM Limited | Information & communication | 2014 |
| Teknogeny Limited | Information & communication | 2025 |
| Teks Intelligence Ltd | Information & communication | 2026 |
| Tekzone Web Solutions UK Limited | Information & communication | 2022 |
| Telecoms World (Group) Limited | Information & communication | 2014 |
| Telecoms World Direct Limited | Information & communication | 2006 |
| Telecoms World Limited | Information & communication | 1998 |
| Telema Limited | Real estate | 2020 |
| Tell Them Touring Ltd | Information & communication | 2024 |
| Tellis George Production Ltd | Wholesale & retail | 2019 |
| Temi's Healthcare Ltd | Health & social care | 2018 |
| Temo BLU Properties Limited | Households | 2025 |
| Temo Tidolo Ltd | Education | 2020 |
| Temple Stoddart Consulting Ltd | Professional & scientific | 2024 |
| Temple Therapeutic Touch Limited | Health & social care | 2025 |
| Templedene Residents Company Limited | Households | 1970 |
| Templeton & Associates Limited | Professional & scientific | 2020 |
| TEN Nails Spa Limited | Other services | 2020 |
| Teneor Limited | Wholesale & retail | 2025 |
| Tenuous Connection Ltd | Administrative & support | 2009 |
| Tenureown Property Management Limited | Households | 1996 |
| Termlong Property Management Limited | Households | 1996 |
| TES Property Kent Limited | Real estate | 2018 |
| Test Services Ltd | Information & communication | 2016 |
| Tetra Ventures Limited | Wholesale & retail | 2024 |
| Texglobal Limited | Wholesale & retail | 2023 |
| TG Professional Cleaning Limited | Administrative & support | 2016 |
| TGK Ember Ltd | Professional & scientific | 2024 |
| Tglam Events Ltd | Extraterritorial | 2017 |
| TGR Safety Management Ltd | Professional & scientific | 2016 |
| THA London Ltd | Professional & scientific | 2022 |
| Thai Dinning Ltd | Hospitality | 2019 |
| Thames Cleaning & Support Services Limited | Administrative & support | 1968 |
| Thames Cleaning Co. Limited | Professional & scientific | 1997 |
| Thames Cleaning Southern Limited | Professional & scientific | 2001 |
| Thames Services Group Limited | Professional & scientific | 1995 |
| Thames Support Services (Southern) Limited | Professional & scientific | 1997 |
| Thandana Bags Limited | Wholesale & retail | 2024 |
| Thanet Wanderers Limited | Hospitality | 2019 |
| Thanet Wanderers Rufc Limited | Arts & recreation | 2021 |
| Thanetos Ltd | Real estate | 2016 |
| Thanks for Listening Ltd | Arts & recreation | 2019 |
| Thara Thai Restaurant Limited | Hospitality | 2018 |
| Tharviyan Properties Limited | Real estate | 2024 |
| That Card Shop Limited | Wholesale & retail | 2014 |
| THE Advanced Aesthetics & Skin Academy Ltd | Education | 2025 |
| THE Advanced Coaching Academy Ltd | Other services | 2010 |
| THE Agilists Private Limited | Information & communication | 2015 |
| THE Anandpur Sports Club (UK) Ltd | Arts & recreation | 2024 |
| THE Artisan of Locksbottom Limited | Wholesale & retail | 2024 |
| THE Babins Ltd | Health & social care | 2025 |
| THE Baby O Ltd | Wholesale & retail | 2021 |
| THE Bar at Temple Ltd | Hospitality | 2024 |
| THE Bearded Florist Ltd | Wholesale & retail | 2025 |
| THE Beatbars Company Ltd | Wholesale & retail | 2018 |
| THE Bigjalebi Mission Ltd | Professional & scientific | 2024 |
| THE Blue Weber Group UK Limited | Other services | 2026 |
| THE Bombay Orpington Ltd | Hospitality | 2018 |
| THE Bookhouse Group Ltd | Extraterritorial | 2016 |
| THE Boxes Group Ltd | Wholesale & retail | 2019 |
| THE Boyd PUB Company Ltd | Hospitality | 2024 |
| THE Bridge Group Bromley Limited | Administrative & support | 2009 |
| THE Bromley Garden Company Limited | Administrative & support | 2022 |
| THE Brunch Shop Limited | Hospitality | 2013 |
| THE Builder's BUN Limited | Hospitality | 2018 |
| THE Bull PUB and Dining Ltd | Hospitality | 2023 |