| Teraa Electrician Ltd | Construction | 2026 |
| Terago Ltd | Transport & logistics | 2017 |
| Teri Kirpa Foodstore Limited | Wholesale & retail | 2026 |
| Terkkin Future Technologies Ltd | Manufacturing | 2021 |
| Termhouse (Cavendish House) Management Limited | Households | 1977 |
| Terminus House (Commercial) LLP | | 2016 |
| Terminus House Harlow LLP | | 2016 |
| Terminus House Harlow Resi LLP | | 2017 |
| Terona Limited | Hospitality | 2021 |
| Terrace Foods Ltd | Wholesale & retail | 2018 |
| Terrace Yard Management Company Limited | Households | 2011 |
| Terramezzo Ltd | Wholesale & retail | 2017 |
| Terranostra UK Limited | Hospitality | 2019 |
| Terrigal Ltd | Wholesale & retail | 2019 |
| Terry's Bar & Grill Limited | Hospitality | 2022 |
| Terry's Bistro Limited | Hospitality | 2023 |
| Terrys Tea London Limited | Wholesale & retail | 2015 |
| Terry’S Café London Limited | Hospitality | 2022 |
| Terry’S One Stop Limited | Wholesale & retail | 2018 |
| Terwolt Web Ltd | Transport & logistics | 2024 |
| Tesra Ltd | Information & communication | 2017 |
| Tessera Advisory Ltd | Information & communication | 2026 |
| Tessum 03 Limited | Wholesale & retail | 2026 |
| Test Evolve Limited | Information & communication | 2018 |
| Testronic Laboratories Limited | Information & communication | 1997 |
| Tete a Tete Limited | Real estate | 2015 |
| Tetuani Limited | Hospitality | 2023 |
| Teufel & PIK Ltd | Administrative & support | 2021 |
| TEX Active UK Ltd | Construction | 2024 |
| Teymur Limited | Manufacturing | 2011 |
| Tezgel Investments Ltd | Real estate | 2025 |
| TFK Infrastructure Consultancy Ltd | Professional & scientific | 2018 |
| TFM Services Ltd | Transport & logistics | 2024 |
| TFO Holdings Limited | Construction | 2023 |
| TFS PAK Services Ltd | Hospitality | 2025 |
| TG Property Ventures Ltd | Real estate | 2024 |
| TGV Homeimprovements Limited | Construction | 2017 |
| TH Bros Ltd | Wholesale & retail | 2018 |
| Thabo Mhlatshwa Limited | Arts & recreation | 2024 |
| Thakwas Ltd | Wholesale & retail | 2019 |
| Thames C&C Ltd | Wholesale & retail | 2005 |
| Thames Contemporary Homes Limited | Real estate | 1994 |
| Thames Crescent (Chiswick) Management Company Limited | Households | 1995 |
| Thames Cross Investments Ltd | Financial services | 2024 |
| Thames Glazing Ltd | Construction | 2020 |
| Thames Humber Property Limited | Real estate | 2020 |
| Thames Tailoring Limited | Other services | 2018 |
| Thames Tank Cleaning Services Limited | Water & waste | 1991 |
| Thames Tower Management Co Limited | Households | 2010 |
| Thames View Health Limited | Wholesale & retail | 2021 |
| Thames Wholesalers Ltd | Wholesale & retail | 2021 |
| Thamily Builders Ltd | Households | 2019 |
| Thanan Thave Accountants Ltd | Professional & scientific | 2024 |
| Thanan Thave Properties Ltd | Real estate | 2022 |
| Thanet Lodge Freehold Limited | Households | 2012 |
| Thang Ltd | Hospitality | 2023 |
| Thangam Limited | Wholesale & retail | 2026 |
| Thanjavur Food Lounge Limited | Hospitality | 2025 |
| Thanu Autos Ltd | Wholesale & retail | 2025 |
| Thara Popoola Ltd | Information & communication | 2022 |
| Tharun UK Ltd | Wholesale & retail | 2016 |
| Thavis Engineering Limited | Other services | 2015 |
| THE -999 Club Limited | Professional & scientific | 2025 |
| THE 11 Eaton Place Management Company Limited | Households | 2024 |
| THE 3706 Ltd | Wholesale & retail | 2023 |
| THE 79, 81 and 83 London Road RTM Company Limited | Households | 2009 |
| THE 93 Management Company Limited | Households | 1992 |
| THE Aadc Research Trust | Administrative & support | 2005 |
| THE Academy of Aesthetic Excellence Ltd | Manufacturing | 2010 |
| THE Acme Pixel Co. Ltd | Information & communication | 2017 |
| THE Acorns (Ashington) Management Company Limited | Households | 2007 |
| THE Addiscombe Sports Field Trust Company (NO. 1) Limited | Arts & recreation | 2017 |
| THE Addiscombe Sports Field Trust Company (NO. 2) Limited | Arts & recreation | 2017 |
| THE Aesthetics Garden Limited | Health & social care | 2019 |
| THE Affluence Hub Limited | Real estate | 2021 |
| THE Albion Mews (Aldershot) Management Company Limited | Households | 2015 |
| THE Alders West Wickham (Management) Limited | Households | 1992 |
| THE Allotment Gardener Ltd | Wholesale & retail | 2013 |
| THE Almshouses RTM Company Limited | Real estate | 2010 |
| THE American Car Garage Limited | Wholesale & retail | 2022 |
| THE Angel Country Lodge Limited | Hospitality | 2011 |
| THE Apartments RTM Company Limited | Households | 2024 |
| THE Apple Tree Village Ltd | Information & communication | 2026 |
| THE Art Partners Limited | Professional & scientific | 2015 |
| THE Assisted Sale Company Limited | Real estate | 2015 |
| THE Association of Certified Compliance Officers Limited | Public administration | 2019 |
| THE Athenian Greek Street Food Ltd | Hospitality | 2015 |
| THE Attic Agency Limited | Professional & scientific | 2025 |
| THE Audio Project Ltd | Professional & scientific | 2021 |
| THE Auto Driving School Ltd. | Other services | 2016 |
| THE Avenue Number Two Management Company Limited | Households | 2003 |
| THE AYO Clinic Ltd | Health & social care | 2025 |
| THE Bake House Clacton Limited | Manufacturing | 2024 |
| THE Banwell Partnership Ltd. | Professional & scientific | 2020 |
| THE Barber Club Croydon Ltd | Other services | 2025 |
| THE Barnby Road Number 2 Management Company Limited | Households | 2004 |
| THE Barnby Road Number 3 Management Company Limited | Households | 2004 |
| THE Bath Building (Swindon) Management Company Limited | Real estate | 2005 |
| THE Beauty Kiss Ltd | Other services | 2024 |
| THE BEC Trust | Education | 2014 |