| THE Timber & Damp Preservation Co. Limited | Construction | 1996 |
| THE Timperley Flower Co. Ltd | Wholesale & retail | 2025 |
| THE TIN (Travel Intelligence Network) Limited | Information & communication | 2005 |
| THE Trade Corporation Ltd | Financial services | 2023 |
| THE Trans-Siberian Express Company Limited | Administrative & support | 2005 |
| THE Travel Hive MCR Ltd | Administrative & support | 2019 |
| THE Turin Court Partnership | | 1997 |
| THE UK Academy Ltd | Education | 2018 |
| THE UK Accountant Ltd | Professional & scientific | 2018 |
| THE UK Adviser (Client Services) Ltd | Financial services | 2019 |
| THE UK Adviser (Partner Services) Ltd | Administrative & support | 2018 |
| THE UK Adviser Franchise Ltd | Administrative & support | 2018 |
| THE UK Adviser Group Limited | Professional & scientific | 2019 |
| THE UK Adviser Ltd | Financial services | 2017 |
| THE UK Adviser Suite Ltd | Information & communication | 2017 |
| THE UK Business Lender Limited | Financial services | 2025 |
| THE UK Finance Group Ltd | Financial services | 2018 |
| THE UK Financial Adviser Ltd | Extraterritorial | 2018 |
| THE UK Insurance Broker Ltd | Extraterritorial | 2018 |
| THE UK Investor Ltd | Extraterritorial | 2018 |
| THE UK Legal Services Group Ltd | Extraterritorial | 2018 |
| THE UK Lender (SPV 1) Ltd | Financial services | 2025 |
| THE UK Lender Admin Services Ltd | Extraterritorial | 2018 |
| THE UK Lender Group Limited | Financial services | 2025 |
| THE UK Lender Ltd | Financial services | 2018 |
| THE UK Manufacturing Accelerator Ltd | Professional & scientific | 2012 |
| THE UK Mortgage Adviser Ltd | Extraterritorial | 2018 |
| THE UK Professional Network Ltd | Extraterritorial | 2017 |
| THE UK Property Agent Ltd | Real estate | 2018 |
| THE UK Property Lender Limited | Financial services | 2025 |
| THE UK Surveyor (Nationwide) Ltd | Extraterritorial | 2018 |
| THE UK Tattoo Convention Limited | Administrative & support | 2023 |
| THE UK Tax Adviser (Nationwide) Ltd | Extraterritorial | 2018 |
| THE Uk-Israel Group Ltd | Financial services | 2017 |
| THE Umbrella Team Limited | Administrative & support | 2023 |
| THE Vintage Village Limited | Administrative & support | 2011 |
| THE Vision Clinic Limited | Health & social care | 2007 |
| THE Washroom Fit-Out Company (NW) Ltd | Construction | 2003 |
| THE Wellnest Physiotherapy Limited | Other services | 2024 |
| THE Westwood Holdings Group Limited | Financial services | 2023 |
| THE White LAB Limited | Health & social care | 2006 |
| THE White LAB Properties Limited | Real estate | 2017 |
| THE Woodlands Associates Ltd | Real estate | 2025 |
| THE World Spedball Association | Arts & recreation | 2018 |
| THE Yacht Boutique Limited | Wholesale & retail | 2008 |
| THE Yard (Marple) Management Company Ltd | Households | 2023 |
| Thea Bidco Limited | Financial services | 2022 |
| Thea Midco Limited | Financial services | 2022 |
| Thea Topco Limited | Financial services | 2022 |
| Theatre Court Limited | Real estate | 2000 |
| Thecontractplace Limited | Professional & scientific | 2024 |
| Thefood Ltd | Hospitality | 2016 |
| Theia Investments LLP | | 2021 |
| Thenextgen.Energy Ltd | Construction | 2026 |
| Theodore Jesse Developments Ltd | Construction | 2024 |
| Theorydata Limited | Professional & scientific | 2024 |
| Theprettyone Ltd | Other services | 2026 |
| Thermal Equipment Limited | Manufacturing | 2000 |
| Thermo Bioanalysis Limited | Professional & scientific | 1995 |
| Thermo Electron (Management Services) Limited | Professional & scientific | 1996 |
| Thermo Electron Limited | Manufacturing | 1983 |
| Thermo Electron Manufacturing Limited | Manufacturing | 1947 |
| Thermo Electron Weighing & Inspection Limited | Professional & scientific | 1988 |
| Thermo Fisher (Heysham) Limited | Financial services | 2015 |
| Thermo Fisher Diagnostics Limited | Health & social care | 2004 |
| Thermo Fisher Scientific (China) Holding Limited | Professional & scientific | 1996 |
| Thermo Fisher Scientific (CP1) Limited | Professional & scientific | 2021 |
| Thermo Fisher Scientific (CP2) Limited | Professional & scientific | 2021 |
| Thermo Fisher Scientific (OLI) 1 Limited | Extraterritorial | 2023 |
| Thermo Fisher Scientific (OLI) 2 Limited | Extraterritorial | 2023 |
| Thermo Fisher Scientific (OLI) 3 Limited | Extraterritorial | 2023 |
| Thermo Fisher Scientific (OLI) 4 Limited | Extraterritorial | 2025 |
| Thermo Fisher Scientific (OLI) Limited | Extraterritorial | 2023 |
| Thermo Fisher Scientific (OLI) UK Limited | Extraterritorial | 2023 |
| Thermo Fisher Scientific (PN1) UK Limited | Extraterritorial | 2017 |
| Thermo Fisher Scientific AU II Limited | Extraterritorial | 2017 |
| Thermo Fisher Scientific AU Limited | Extraterritorial | 2017 |
| Thermo Fisher Scientific Blade II Limited | Professional & scientific | 2018 |
| Thermo Fisher Scientific Blade III Limited | Professional & scientific | 2018 |
| Thermo Fisher Scientific Blade IV Limited | Financial services | 2019 |
| Thermo Fisher Scientific Blade V Limited | Financial services | 2011 |
| Thermo Fisher Scientific Blade VI Limited | Financial services | 2011 |
| Thermo Fisher Scientific Blade VII Limited | Financial services | 2011 |
| Thermo Fisher Scientific BLG Limited | Extraterritorial | 2023 |
| Thermo Fisher Scientific CHN Holding Limited | Extraterritorial | 2023 |
| Thermo Fisher Scientific FCS Limited | Extraterritorial | 2023 |
| Thermo Fisher Scientific Fsir Holdings (UK) Financing Limited | Extraterritorial | 2021 |
| Thermo Fisher Scientific GCL Limited | Extraterritorial | 2023 |
| Thermo Fisher Scientific Holdings Europe Limited | Professional & scientific | 2009 |
| Thermo Fisher Scientific Life Financing 2 Limited | Extraterritorial | 2022 |
| Thermo Fisher Scientific Life Financing Limited | Professional & scientific | 2016 |
| Thermo Fisher Scientific Life Holdings 1 Limited | Extraterritorial | 2023 |
| Thermo Fisher Scientific Life Holdings 2 Limited | Extraterritorial | 2022 |
| Thermo Fisher Scientific Life Holdings Limited | Manufacturing | 2013 |
| Thermo Fisher Scientific Life Technologies Enterprise Holding Limited | Professional & scientific | 2014 |
| Thermo Fisher Scientific Life Technologies Investment UK I Limited | Professional & scientific | 2014 |
| Thermo Fisher Scientific Life Technologies Investment UK II Limited | Professional & scientific | 2014 |
| Thermo Fisher Scientific Life Technologies Israel Investment I Limited | Professional & scientific | 2014 |
| Thermo Fisher Scientific Life Technologies Israel Investment II Limited | Professional & scientific | 2014 |
| Thermo Fisher Scientific Matrix Holding Limited | Extraterritorial | 2022 |