| THE Way Concepts Limited | Wholesale & retail | 2026 |
| THE Wellness Foundation Ltd | Extraterritorial | 2016 |
| THE Whisky Clubs Group Ltd | Hospitality | 2012 |
| THE Wildlings Ltd | Education | 2017 |
| THE Willows Retreat Group Limited | Other services | 2026 |
| THE Wine Carafe Limited | Wholesale & retail | 2010 |
| THE Wombroom Ltd. | Information & communication | 2012 |
| The-New Generation Housing CIC | Health & social care | 2025 |
| Thebastian Limited | Hospitality | 2025 |
| Theia Concepts Limited | Education | 2013 |
| Theisura Ltd | Administrative & support | 2019 |
| Theodore Emms Limited | Financial services | 1952 |
| Theprintingpioneers Limited | Manufacturing | 2025 |
| Thermasafe Technologies Ltd | Manufacturing | 2026 |
| Thermetal Limited | Manufacturing | 2003 |
| Thermotec Services UK Ltd | Manufacturing | 2017 |
| Think Contracts (Group) Limited | Financial services | 2021 |
| Think Contracts (Holdings) Limited | Financial services | 2016 |
| Think Contracts Limited | Construction | 2008 |
| Third From the Right Productions Limited | Arts & recreation | 2017 |
| Thomas Bradley (WM) Limited | Construction | 2022 |
| Thomas Dudley Developments Limited | Extraterritorial | 1981 |
| Thomas Dudley Foundry Limited | Manufacturing | 2014 |
| Thomas Dudley Group Limited | Manufacturing | 1962 |
| Thomas Dudley Holdings Limited | Manufacturing | 2023 |
| Thomas Dudley Limited | Manufacturing | 1989 |
| Thomas Holdings and Investments Ltd | Financial services | 2025 |
| Thomas Homes (Midlands) Limited | Construction | 2009 |
| Thomatia Floors Limited | Other services | 2019 |
| Thompson and Parchment Properties Ltd | Real estate | 2020 |
| Thomson Electrical Limited | Construction | 2011 |
| Thornebridge Holdings and Investments Ltd | Financial services | 2026 |
| Thornebridge Homes Ltd | Real estate | 2016 |
| Thornebridge Properties Ltd | Real estate | 2026 |
| Thresher and Company Limited | Extraterritorial | 2011 |
| Thresher Group Limited | Extraterritorial | 2011 |
| Thresher Property Company Limited | Extraterritorial | 2011 |
| Thresher Wine Acquisitions Limited | Extraterritorial | 2011 |
| Threshers Wine Online Limited | Wholesale & retail | 2012 |
| Throstle QS Services Limited | Professional & scientific | 2007 |
| THROUGH49 Limited | Professional & scientific | 2007 |
| Ticc Electrical Limited | Construction | 2025 |
| Tiddlywinks Kiddy's Nursery Limited | Health & social care | 2011 |
| Tide Refuelling Limited | Manufacturing | 2023 |
| Tiffany Marie Tattoo Ltd | Arts & recreation | 2022 |
| TII Technologies Limited | Information & communication | 1981 |
| Tilstock Tractors Limited | Other services | 1994 |
| Timber 2 U Limited | Wholesale & retail | 2014 |
| Timber TIM Limited | Other services | 2002 |
| Timeaway Properties Ltd | Real estate | 2020 |
| Timetabling for Schools Ltd | Information & communication | 2024 |
| Timetools Holdings and Investments Ltd | Financial services | 2020 |
| Timetools Property Investments Ltd | Real estate | 2022 |
| Timken UK Limited | Manufacturing | 1997 |
| Timms Accountants Limited | Professional & scientific | 2015 |
| Timms and Family Properties Limited | Real estate | 2021 |
| Tinchilly Ltd | Real estate | 2025 |
| Tiny Harts (Holdings) Limited | Health & social care | 2026 |
| Tinyiko Healthcare Ltd | Public administration | 2023 |
| Tinyjumpers Ltd | Wholesale & retail | 2024 |
| Tips Social Networking Ltd | Professional & scientific | 2026 |
| Tiptop Products Ltd | Wholesale & retail | 2026 |
| TIRANGA2026 Limited | Hospitality | 2025 |
| Titan Autotrim Ltd | Manufacturing | 2023 |
| Titan Beds Limited | Manufacturing | 2015 |
| Titan Leisure Products Ltd | Manufacturing | 2013 |
| Titan Presses & Monitoring Ltd | Manufacturing | 2015 |
| Titanium Properties Holdings & Investments Ltd | Financial services | 2023 |
| Titanium Property Group Limited | Real estate | 2022 |
| Titanium Techniques (2001) Limited | Manufacturing | 2001 |
| TJB Heating & Plumbing Ltd | Construction | 2026 |
| TJI Fashion Ltd | Wholesale & retail | 2024 |
| TJK Recruitment Limited | Administrative & support | 2014 |
| TJM Brickwork (UK) Ltd | Construction | 2014 |
| TJM Holdings and Investments Ltd | Financial services | 2021 |
| TJM Properties (Midlands) Limited | Real estate | 2020 |
| Tjmachi Limited | Health & social care | 2019 |
| TM Skips Limited | Water & waste | 2022 |
| TMI Property Developments Ltd | Real estate | 2021 |
| TMW Book-Keeping Limited | Professional & scientific | 2013 |
| Toco Group Limited | Information & communication | 2003 |
| Tominko Ltd | Manufacturing | 2019 |
| Tone Tunnel Ltd | Manufacturing | 2026 |
| Tony Cook Industrial Roofing & Cladding Limited | Construction | 2020 |
| Tony GEE Services Ltd | Construction | 2019 |
| Top 1 Pizza Limited | Hospitality | 2026 |
| Top 1 UKS Fried Chicken and Pizza Ltd | Hospitality | 2024 |
| Top Deal Motors Ltd | Wholesale & retail | 2025 |
| Top Hairstylist Ltd | Other services | 2022 |
| Top Marks Holdings and Investments Ltd | Financial services | 2022 |
| Top Marks Installations Ltd | Construction | 2021 |
| Top One Staffing Ltd | Administrative & support | 2021 |
| Top Pick Property Group Ltd | Hospitality | 2024 |
| Top Shopfronts Ltd | Manufacturing | 2018 |
| Top Spec Interiors Limited | Construction | 2006 |
| Tophaus Investments Limited | Real estate | 2019 |
| Tophaus Limited | Financial services | 2019 |
| Toploader Transport Limited | Transport & logistics | 2009 |
| Topmost Bliss Ltd | Wholesale & retail | 2024 |
| Toppies Tasty Bites Ltd | Hospitality | 2016 |