| Tastycloud Limited | Hospitality | 2024 |
| Tate Munro Consulting Limited | Real estate | 2018 |
| Tattenhoe Park (Parcel 4) Management Company Limited | Households | 2022 |
| Tattershall Lakes Limited | Hospitality | 2009 |
| Tattoo Shed Limited | Other services | 2011 |
| Taurus Secure Ltd | Construction | 2020 |
| Tax and Figures (Hemel Hempstead) LLP | | 2004 |
| Tax and Figures Ltd | Real estate | 2004 |
| Tax-Bookss Limited | Professional & scientific | 2023 |
| Taxaccountants Online Limited | Professional & scientific | 2018 |
| Taxaccountssolutions Limited | Professional & scientific | 2022 |
| TAXRETURNS4U Limited | Professional & scientific | 2023 |
| Taxxbooks Limited | Information & communication | 2023 |
| TAY Refurbishments Limited | Construction | 2023 |
| TAY Traders Ltd | Wholesale & retail | 2021 |
| Tay-Bl Properties Limited | Real estate | 2025 |
| Tayana Limited | Administrative & support | 2024 |
| Taylor Rose Recruitment Limited | Administrative & support | 2018 |
| Taylor’S Wheelie Cleans Ltd | Administrative & support | 2025 |
| Taymor Solutions Ltd | Construction | 2016 |
| TB Catering Ltd | Hospitality | 2025 |
| TB Scaffolding Limited | Construction | 2025 |
| TBP Trades Ltd | Construction | 2026 |
| Tbrg Services Ltd | Construction | 2023 |
| TBS Tutka Ltd | Construction | 2005 |
| TC Alliance Limited | Administrative & support | 2019 |
| TCE Electrical Contractors Ltd | Construction | 2023 |
| TCR Properties Limited | Professional & scientific | 1907 |
| Tcsb Limited | Professional & scientific | 2018 |
| Tcwp Property and Investments Ltd | Real estate | 2025 |
| TDP Plumbing & Heating Limited | Construction | 2018 |
| TDR Company Private Transport Ltd | Transport & logistics | 2026 |
| Team Advisory Ltd | Professional & scientific | 2020 |
| Team Brooks Holdings Ltd | Financial services | 2024 |
| Team Dolly (2018) Ltd | Construction | 2018 |
| Team Factors Limited | Financial services | 2007 |
| Team Ware Limited | Manufacturing | 2013 |
| Team World Ltd | Information & communication | 2018 |
| Teamsportz Group Ltd | Arts & recreation | 2020 |
| Tech Platoon Ltd | Information & communication | 2011 |
| Tech Systems Consulting Limited | Administrative & support | 2020 |
| Technegic Ltd | Wholesale & retail | 2020 |
| Technet E-Learning Services LLP | | 2011 |
| Technical Management Solutions Limited | Professional & scientific | 2016 |
| Technit Ltd | Information & communication | 2021 |
| Technocirrus Solutions Limited | Information & communication | 2023 |
| Techride Solutions Ltd | Transport & logistics | 2024 |
| Tectonics Corporation Ltd | Construction | 2014 |
| Teemo Food and Wine Ltd | Wholesale & retail | 2026 |
| Teja's Software Solutions PVT Ltd | Information & communication | 2023 |
| Teknikal Specialist Recruitment Ltd | Administrative & support | 2020 |
| Tektas Kitchen Ltd | Hospitality | 2017 |
| Tekwisdom UK Limited | Wholesale & retail | 2019 |
| Teleone Trading Ltd | Energy | 2023 |
| Telford Projects Limited | Professional & scientific | 1999 |
| Temid Ltd | Information & communication | 2019 |
| Temple Wharf Management Company Limited | Households | 2017 |
| Temple Woods Management Company Limited | Households | 2022 |
| Tenacious Gyms Limited | Arts & recreation | 2025 |
| Tenancy Deposit Scheme Limited | Professional & scientific | 2004 |
| Tennant & Co Accountancy Limited | Professional & scientific | 2026 |
| TENONE8 Ventures Ltd | Financial services | 2024 |
| Tensai Limited | Information & communication | 2004 |
| Tenten Consultancy Limited | Administrative & support | 2009 |
| Tenthmatrix Information Systems Ltd | Information & communication | 2008 |
| Terence Fidler Partnership Limited | Professional & scientific | 2005 |
| Termhouse (Denham Court) Management Limited | Households | 1976 |
| Ternohouse Ltd | Construction | 2013 |
| Terry Style Academy Limited | Education | 2021 |
| Tesluk Holdings Limited | Financial services | 2025 |
| Tesnet Group Ltd | Information & communication | 2022 |
| Tesnet Ltd | Information & communication | 2022 |
| Tesylate Ltd | Information & communication | 2018 |
| Teulon Court (Angmering) Management Limited | Households | 2010 |
| Texort Ltd | Wholesale & retail | 2025 |
| Textile Apartments Management Company Limited | Households | 2002 |
| TFC Top Floor Conversions Ltd | Construction | 2017 |
| TFF Tutors Ltd | Education | 2019 |
| Tfss Limited | Construction | 2011 |
| TFV Consulting Limited | Information & communication | 2014 |
| TGT Property Ltd | Real estate | 2020 |
| Thai Trading Limited | Wholesale & retail | 2013 |
| Thaimassagedirectory.Com Limited | Information & communication | 2025 |
| Thamesbury Estates Limited | Real estate | 2003 |
| Thamesbury Holdings Limited | Real estate | 2010 |
| That Blackademic Life Ltd. | Extraterritorial | 2016 |
| THE Antique Buying Collective Ltd | Wholesale & retail | 2024 |
| THE Antique Collective Ltd | Wholesale & retail | 2024 |
| THE Apsley Bakehouse Ltd | Manufacturing | 2021 |
| THE Apsley Paper Trail | Manufacturing | 1997 |
| THE Artisan Chilli Limited | Wholesale & retail | 2022 |
| THE Artwork Factory Ltd | Professional & scientific | 2010 |
| THE Ashes (Sefton) Management Company Limited | Households | 2004 |
| THE Atrium Residents Management Company Limited | Households | 2025 |
| THE Avenues (Sandy Gate Lane) Management Company Limited | Households | 2020 |
| THE B FAM Co. Ltd | Construction | 2025 |
| THE Barn Personal Training Studio Ltd | Arts & recreation | 2025 |
| THE Barns Residents Management Ltd | Other services | 2018 |
| THE Beautique Hemel Ltd | Other services | 2022 |
| THE Beeches (Lindfield) Management Company Limited | Households | 2020 |