| Technology Enablement Ltd | Financial services | 2021 |
| Technology Solution Services Ltd | Information & communication | 2018 |
| Tekworks Consultancy Ltd | Information & communication | 2014 |
| Templeton Estates Limited | Construction | 2024 |
| Templeton Estates Properties LLP | | 2018 |
| Tepa Group Holding Ltd | Hospitality | 2021 |
| Tepa Property Investment Ltd | Real estate | 2021 |
| Terrasavana Ltd | Professional & scientific | 2022 |
| Terraspan Properties Ltd | Hospitality | 2021 |
| Tesed Holding Ltd | Financial services | 2020 |
| Testroport 24 Ltd | Professional & scientific | 2026 |
| TH Equine Ltd | Agriculture & fishing | 2021 |
| TH UK & Ireland Limited | Hospitality | 2016 |
| Thames Boat Services Limited | Manufacturing | 2019 |
| Thames Side Tree Surgery and Landscaping Ltd | Administrative & support | 2025 |
| Thames Valley Pizza Limited | Hospitality | 2025 |
| Thamesask Limited | Real estate | 2013 |
| Thatfilmcompany Ltd. | Information & communication | 2018 |
| THE Anonymous PUB Group Limited | Hospitality | 2025 |
| THE Antique Barn Ltd | Wholesale & retail | 2019 |
| THE Art of Aesthetics Limited | Health & social care | 2015 |
| THE Bodyshop Hub Ltd | Professional & scientific | 2024 |
| THE Centre for Food & Health Studies Ltd. | Information & communication | 1995 |
| THE Cups International Limited | Hospitality | 2016 |
| THE Doppler Effect Limited | Professional & scientific | 2015 |
| THE Eagles Transport Ltd | Transport & logistics | 2026 |
| THE East to West Trust | Other services | 2009 |
| THE Estate Collection Ltd | Real estate | 2025 |
| THE Fine Flowers Company (UK) Limited | Wholesale & retail | 2005 |
| THE Fire Extinguisher Store Limited | Wholesale & retail | 2018 |
| THE Foresters [Arms] Bagshot Ltd | Other services | 2017 |
| THE GIG at the END of the World Ltd | Information & communication | 2022 |
| THE Groom Cottage Company Limited | Extraterritorial | 2025 |
| THE Group HUG Ltd | Information & communication | 2019 |
| THE Happy MAN PUB Limited | Hospitality | 2025 |
| THE Hope Theatre CIC | Arts & recreation | 2024 |
| THE Info & Comm Company | Professional & scientific | 2021 |
| THE Institute of Telecommunications Professionals | Information & communication | 2002 |
| THE Jigsaw Collective Limited | Other services | 2017 |
| THE Little Landlady Ltd | Real estate | 2024 |
| THE Little Things Coffee Company Ltd | Administrative & support | 2018 |
| THE London Dispensary Co Limited | Extraterritorial | 1997 |
| THE Nail Bar Honor Oak Ltd | Other services | 2023 |
| THE New Ambassador Ltd | Construction | 2024 |
| THE Online Hair Academy Ltd | Other services | 2026 |
| THE Pink Concrete Company Limited | Manufacturing | 2023 |
| THE Rage Room Group Ltd | Arts & recreation | 2026 |
| THE Right Candidates Ltd | Administrative & support | 2018 |
| THE Salon TW18 Limited | Other services | 2014 |
| THE Search Group Limited | Administrative & support | 2011 |
| THE Social Presence Ltd | Professional & scientific | 2024 |
| THE Soil of My Hometown Ltd | Other services | 2024 |
| THE Student Voice (TSV) Limited | Information & communication | 2021 |
| THE Style Project Ltd | Wholesale & retail | 2022 |
| THE Surrey Poet Laureateship CIC | Arts & recreation | 2024 |
| THE Techniques Labs Ltd | Information & communication | 2020 |
| THE Useless Comp Ltd | Professional & scientific | 2022 |
| THE Vitalis Journal Ltd | Information & communication | 2024 |
| The-Go Together Ltd | Real estate | 2026 |
| Themeday Limited | Extraterritorial | 1997 |
| Theovaco Ltd | Manufacturing | 2021 |
| Thewin Properties Ltd | Real estate | 2024 |
| Think Site Services and Solutions Ltd | Construction | 2025 |
| Thinkogram Limited | Professional & scientific | 2024 |
| This IS Alvis Ltd | Other services | 2024 |
| This IS One Limited | Information & communication | 2018 |
| Thomas Gray EOT Limited | Administrative & support | 2022 |
| Thomas Gray Limited | Administrative & support | 2011 |
| Thomi Trading Ltd | Real estate | 2020 |
| Thorpe Court Management Company Limited | Real estate | 2014 |
| Thorpe Laundry Services Ltd | Other services | 2023 |
| Thorpe Plumbing & Heating Solutions Ltd | Construction | 2025 |
| Thorpe Stores UK Limited | Wholesale & retail | 2006 |
| Thorpetone Limited | Extraterritorial | 1996 |
| Threads Alliance Ltd | Transport & logistics | 2025 |
| Threehouse Homes Ltd | Real estate | 2023 |
| Threehouse SA Ltd | Hospitality | 2024 |
| Thurnby Care Holdings Limited | Financial services | 2021 |
| Thurnby Care Home Limited | Health & social care | 2021 |
| Thurnby Care Limited | Health & social care | 2021 |
| Thurner Ltd | Financial services | 2020 |
| Tibai Ltd | Professional & scientific | 2023 |
| Tidy Terra Limited | Information & communication | 2023 |
| TIM Hortons UK & Ireland Limited | Hospitality | 2016 |
| Time 24 Holdings Limited | Financial services | 2011 |
| Time 24 Limited | Manufacturing | 1987 |
| Time Tracer Limited | Information & communication | 1998 |
| Timewalk Properties Limited | Real estate | 2019 |
| Timolo Ltd | Professional & scientific | 2023 |
| Tino Properties Ltd | Real estate | 2023 |
| Titan Edge Engineering Ltd | Manufacturing | 2003 |
| Titicaca Investment Ltd | Real estate | 2020 |
| TJ Roofing and Bulding Ltd | Construction | 2024 |
| TLC Air Conditioning Limited | Energy | 2017 |
| TMC (Southern) Limited | Information & communication | 2002 |
| TMV Property Limited | Real estate | 2023 |
| Tobbley Ltd | Wholesale & retail | 2019 |
| Tofan Security Ltd | Administrative & support | 2017 |
| TOL Investing Ltd | Real estate | 2022 |
| Top Demolition Limited | Construction | 2022 |