| Thompson Capital Ltd | Extraterritorial | 2024 |
| THRE3TENTERPRISE Limited | Real estate | 2026 |
| Three Generations Farming Limited | Agriculture & fishing | 2025 |
| Three Steps Ltd | Health & social care | 2015 |
| Three Vale Shooting Club Ltd | Arts & recreation | 2018 |
| Three Wisemen Cleaning Services Ltd | Administrative & support | 2025 |
| Thrive Community Services Limited | Extraterritorial | 2009 |
| Through the Line Limited | Information & communication | 1997 |
| Tian JIN Golden Sunlight Marine Co., Ltd | Transport & logistics | 2024 |
| Tiancheng New Material Technology Co., Ltd | Extraterritorial | 2021 |
| Tiangang Holding Co., Ltd | Manufacturing | 2018 |
| Tianjin Minjie New Material Co., Ltd | Wholesale & retail | 2018 |
| Tianjin Tangfa Watts Valve Limited | Manufacturing | 2023 |
| Tianjin Yifei Hygienic Products Co., Ltd | Extraterritorial | 2016 |
| Tianjin Yongwen International Trade Limited | Wholesale & retail | 2023 |
| Tick Tocks Enterprises Ltd | Hospitality | 2025 |
| Tick Waves Limited | Administrative & support | 2024 |
| Tifan Ltd | Agriculture & fishing | 2020 |
| Tigerpaper Limited | Households | 2000 |
| Tijarah Ventures Ltd | Wholesale & retail | 2025 |
| Tikkatraders Ltd | Wholesale & retail | 2024 |
| Timber Yard Management Maiden Bradley Ltd | Households | 2022 |
| Time for YOU Dartford Ltd | Administrative & support | 2024 |
| Timely Response Ltd | Transport & logistics | 2026 |
| Timemaker Systems Ltd | Manufacturing | 1992 |
| Timothy Samuels Consulting Ltd | Information & communication | 2016 |
| Tinkering Tings Ltd | Manufacturing | 2022 |
| Tinta-Z Limited | Hospitality | 2023 |
| Tisbury Supplies Limited | Wholesale & retail | 2012 |
| Tisco Group Stainless Steel Co., Ltd | Manufacturing | 2023 |
| Titanium Estates Limited | Professional & scientific | 2004 |
| Titanium Estates Management LLP | | 2012 |
| Titantex Limited | Wholesale & retail | 2011 |
| Tiwani Homes and Partners Ltd | Professional & scientific | 2024 |
| TJD Carpentry Limited | Manufacturing | 2025 |
| TJL Electrical Installations Limited | Construction | 2020 |
| TJL Testing & Maintenance Ltd | Manufacturing | 2021 |
| TJS Harmonie Healthcare Service Ltd | Health & social care | 2026 |
| TK Ductwork Ltd | Construction | 2015 |
| TKF Developments Ltd | Real estate | 2021 |
| TKF Group Ltd | Construction | 2018 |
| TLG Music Ltd | Arts & recreation | 2009 |
| TM Retailer Ltd | Wholesale & retail | 2016 |
| TMK Construction Ltd | Construction | 2022 |
| TMM Accountants & Tax Advisers Ltd | Professional & scientific | 2026 |
| Tmrt (London) Limited | Wholesale & retail | 2018 |
| Tmrw Creatives CIC | Education | 2026 |
| TMT Driving School Ltd | Transport & logistics | 2017 |
| TN Scaffolding Access Ltd | Construction | 2019 |
| Todo Camiones Ltd. | Manufacturing | 2024 |
| Tofadachi Transport Limited | Transport & logistics | 2026 |
| Together for ALL CIC | Education | 2026 |
| Tok-Ac Mobile Chef Ltd | Hospitality | 2019 |
| Tokchins Ltd | Information & communication | 2025 |
| Tolat Medical Services Ltd | Health & social care | 2010 |
| Tolgate Coffee Ltd | Manufacturing | 2017 |
| Tolley Estates Limited | Real estate | 2015 |
| Tolley Properties Limited | Real estate | 2024 |
| Tomdem Ltd | Construction | 2022 |
| Tomi Hair Girl Ltd | Other services | 2018 |
| Toms Electrical Southeast Ltd | Construction | 2018 |
| Tonfill Enterprise Services Limited | Professional & scientific | 2014 |
| Tonia Healthcare and Beauty International Ltd | Administrative & support | 2017 |
| Tony Autos 78 Ltd | Wholesale & retail | 2016 |
| Tony Jarvis Limited | Wholesale & retail | 1993 |
| Toobes Ltd | Manufacturing | 2023 |
| Tools 2 YOU Ltd | Wholesale & retail | 2019 |
| Toot Shop Ltd | Wholesale & retail | 2025 |
| Tootington Ltd | Hospitality | 2020 |
| Top Condition Small Group Personal Training Ltd | Other services | 2022 |
| Top Eagle Group Co., Ltd | Wholesale & retail | 2019 |
| Top END Barbers Ltd | Other services | 2022 |
| Top Nice International Co., Ltd | Manufacturing | 2022 |
| Top Nosh Kent Ltd | Hospitality | 2024 |
| Top of the Range Oven and Carpet Cleaning Services Limited | Other services | 2018 |
| Top Phones Repair Centre Ltd | Wholesale & retail | 2025 |
| Top Roman Ltd | Manufacturing | 2022 |
| Top Star Worldwide Ltd | Wholesale & retail | 2024 |
| Topcat's Plumbing & Heating Ltd | Construction | 2006 |
| Toppers Drinks Limited | Wholesale & retail | 2024 |
| Toppers of Hackney Ltd | Other services | 2011 |
| Tops Material and Service Limited | Manufacturing | 2023 |
| Topwin Resources Ltd | Wholesale & retail | 2023 |
| Toronto Transport Limited | Transport & logistics | 2017 |
| Total Site Supplies Ltd | Manufacturing | 2015 |
| Totalserve Limited | Administrative & support | 1998 |
| Toucan HQ Limited | Administrative & support | 2026 |
| Tour Life Clothing Ltd | Wholesale & retail | 2026 |
| Towdah Consultancy Limited | Professional & scientific | 2026 |
| Tower Mansions (Freeholders) Ltd | Households | 2014 |
| Tower Plumbing & Heating Services Ltd | Construction | 2026 |
| Town & Country Aerials Ltd | Information & communication | 2011 |
| Town & Country Cars (Kent) Limited | Wholesale & retail | 1995 |
| Townsendcavendishchadwick Ltd | Information & communication | 2014 |
| TP Industry GAS Group Limited | Manufacturing | 2020 |
| TPA Community CIC | Administrative & support | 2026 |
| TPA Supported Living Ltd | Health & social care | 2018 |
| TPS Clapham Limited | Real estate | 2014 |
| TPS Lettings Ltd | Real estate | 2019 |
| Trac Operations Ltd | Professional & scientific | 2025 |