| THE Petroleum and Renewable Energy Company Limited | Mining & quarrying | 1999 |
| THE Pines (Ascot) Management Company Limited | Real estate | 2014 |
| THE Playing Shakespeare Company LLP | | 2025 |
| THE Ramp Project | Other services | 2019 |
| THE Ranch Projects Limited | Construction | 2025 |
| THE Red Submarine Ltd | Professional & scientific | 2022 |
| THE Revival Company (Southern) Ltd | Construction | 2001 |
| THE Riverside Day Nursery Limited | Education | 2009 |
| THE Roof & Guttering Company Ltd | Construction | 2023 |
| THE Roseland Motor Club Ltd | Other services | 2024 |
| THE Salon Sunningdale Ltd | Other services | 2024 |
| THE Shire Sweep Limited | Administrative & support | 2024 |
| THE Silks Management Company Limited | Households | 2023 |
| THE Style Lounge Virginia Water Ltd | Other services | 2024 |
| THE Sugar LAB Limited | Hospitality | 2024 |
| THE Tavistock Partnership Limited | Financial services | 2001 |
| THE Thatched Tavern Limited | Hospitality | 2009 |
| THE Theory of Beauty Ltd | Other services | 2025 |
| THE Thinking Harbour Limited | Administrative & support | 2022 |
| THE Thorp Building Ltd | Real estate | 2023 |
| THE Thought PT Ltd | Education | 2022 |
| THE Together Revolution Ltd | Wholesale & retail | 2018 |
| THE Upham PUB Company Limited | Hospitality | 1988 |
| THE Vine Medical Group Limited | Health & social care | 2016 |
| THE Walled Garden (Tekels Park) M.C. Ltd | Real estate | 2020 |
| THE Walton Drive and Dawnay Close Residents Association Limited | Households | 1994 |
| THE Wardrobe & Bookcase Co. Ltd | Wholesale & retail | 2017 |
| THE Wellness Way Limited | Information & communication | 2016 |
| Thebrandworks Distribution Ltd | Wholesale & retail | 2023 |
| Thebrandworks Ltd | Wholesale & retail | 2023 |
| Thehop Ltd | Professional & scientific | 2020 |
| Thenextversion Ltd | Professional & scientific | 2018 |
| Thenorthstar Group Ltd | Professional & scientific | 2024 |
| Theo's Legacy Limited | Other services | 2017 |
| Third & Bird Property Limited | Construction | 2024 |
| Thirty Three Property Ltd | Real estate | 2020 |
| Thoday Crescent Management Company Limited | Households | 2025 |
| Thomas 121 Property Ltd | Real estate | 2022 |
| Thorley Barns Limited | Real estate | 2024 |
| Thorney Lane LLP | | 2008 |
| Thorp Modelmakers Limited | Extraterritorial | 1966 |
| Thrive Equity Group Ltd | Professional & scientific | 2024 |
| Tick Technology Ltd. | Information & communication | 2012 |
| Tide Technology Limited | Information & communication | 2024 |
| Tierney Financial Consulting Ltd | Financial services | 2016 |
| Tigerfin Limited | Real estate | 2017 |
| Tilbrook Design & Build Ltd | Construction | 2005 |
| Tile Cleaning Agents Ltd | Administrative & support | 2018 |
| TIR Services Ltd | Education | 2024 |
| Titan Records Limited | Wholesale & retail | 2020 |
| Tite Street Consulting and Advisory Limited | Professional & scientific | 2024 |
| Titlarks Development Company Limited | Administrative & support | 2015 |
| Tiwiwa Ltd | Manufacturing | 2015 |
| TK Building and Ground Services Limited | Construction | 2024 |
| Tobin & Theven Limited | Professional & scientific | 2007 |
| TOD Group Ltd | Manufacturing | 2017 |
| TOD Technologies Ltd | Manufacturing | 2021 |
| Tofite Consulting Ltd | Professional & scientific | 2013 |
| Toke AI Ltd | Information & communication | 2024 |
| Toke Group Ltd | Information & communication | 2022 |
| TOM French Jewellery Limited | Wholesale & retail | 2005 |
| Tompkins Barron Developments Limited | Real estate | 1982 |
| Tompkins Barron Holdings Limited | Financial services | 1982 |
| Tonbridge and Malling NO 1 Ltd | Construction | 2025 |
| Top GUN Chauffeur Ltd | Transport & logistics | 2021 |
| Top Swimmers Ltd | Education | 2026 |
| Toros Support Services Limited | Professional & scientific | 2019 |
| Total Futures Ltd | Education | 2014 |
| Total Pilates Club Ltd | Education | 2025 |
| Tracer GAS UK Limited | Extraterritorial | 2026 |
| Tracr Hematology Limited | Professional & scientific | 2014 |
| Tracy Holliday Interiors Ltd | Professional & scientific | 2019 |
| Tracy-Joe Karam Limited | Other services | 2021 |
| Tradekick Ltd | Information & communication | 2025 |
| Trajan Solutions Ltd | Information & communication | 2016 |
| Trangkae Limited | Professional & scientific | 2008 |
| Tranquility Freehold Company Limited | Real estate | 2024 |
| Transport Works Management Ltd | Households | 2022 |
| Traqs Consulting Ltd | Professional & scientific | 1998 |
| Trend Editions Limited | Information & communication | 2018 |
| Trendsetter Brands & Distribution Limited | Wholesale & retail | 2020 |
| Treviso 1978 Ltd | Professional & scientific | 2024 |
| Treyford Marine Limited | Transport & logistics | 2026 |
| Triadflex Solutions Ltd | Construction | 2024 |
| Trident Loans Limited | Financial services | 2017 |
| Trinity Motors Limited | Wholesale & retail | 2002 |
| Triple Travel Limited | Administrative & support | 2018 |
| Tripod FM Ltd | Households | 2022 |
| Trotsworth Court Association Limited | Households | 1958 |
| Trtf Ltd | Real estate | 2024 |
| True Resilience Limited | Professional & scientific | 2009 |
| Trueblock Properties Ltd | Real estate | 2025 |
| Trunck & Co Limited | Administrative & support | 2007 |
| Trust ERP Limited | Information & communication | 2024 |
| Trusted Tree Mortgages Ltd | Financial services | 2024 |
| Trustees of CP Ltd | Financial services | 2023 |
| Tuckerbox Consultants Limited | Professional & scientific | 2018 |
| Tunui NIC Kipkururi Ltd | Wholesale & retail | 2026 |
| Turas Logistics Limited | Transport & logistics | 2026 |
| Tutus Consulting Limited | Professional & scientific | 2019 |