| THE West Midlands HIP and Knee Clinic Ltd | Health & social care | 2015 |
| THE White Lion SC Ltd | Hospitality | 2024 |
| THE William Agency Limited | Professional & scientific | 2018 |
| THE Willows Property Management Company Limited | Households | 2001 |
| THE Window Cleaning Group Ltd | Administrative & support | 2020 |
| THE Wishaw Golf Club (2023) Limited | Arts & recreation | 2022 |
| THE Wishaw Golf Club Limited | Arts & recreation | 1996 |
| THE Women's Golf Hub Limited | Education | 2025 |
| THE Wood Factory Limited | Manufacturing | 2021 |
| THE Woods Childcare Limited | Health & social care | 2014 |
| The-Secret Ltd | Wholesale & retail | 2015 |
| Theatre and Live Event Production Services Ltd | Administrative & support | 2011 |
| Thelearnersco Ltd | Education | 2026 |
| Thermal Process Management Ltd | Wholesale & retail | 2005 |
| Thermcore Electricals Limited | Manufacturing | 2014 |
| Thermo Heat & Sweep Limited | Construction | 2023 |
| Thermonedo Ltd | Information & communication | 2025 |
| Thesocialentrepreneur Ltd | Administrative & support | 2021 |
| Thestudentboardroom Ltd | Education | 2025 |
| Thetrendix Ltd | Wholesale & retail | 2023 |
| THF Construction Limited | Construction | 2026 |
| Thilak - First Contact Physio Solutions Ltd | Education | 2021 |
| Think Accountancy & Finance (Staffs) Limited | Administrative & support | 2023 |
| Think Care (Midlands) Limited | Administrative & support | 2023 |
| Think Care Group Limited | Administrative & support | 1990 |
| Think Construction (Midlands) Limited | Administrative & support | 2021 |
| Think Construction Partners Limited | Administrative & support | 2026 |
| Think Education Group Limited | Administrative & support | 2023 |
| Think Education Partners Limited | Education | 2023 |
| Think FE Limited | Administrative & support | 2021 |
| Think Housing Limited | Administrative & support | 2019 |
| Think Office Recruitment Limited | Administrative & support | 2023 |
| Think Property & Surveying Limited | Administrative & support | 2023 |
| Think PS Limited | Administrative & support | 2008 |
| Think Recruitment (UK) Limited | Administrative & support | 2004 |
| Think Recruitment Group Limited | Professional & scientific | 2008 |
| Think Recruitment Limited | Administrative & support | 2023 |
| Think Trades Limited | Administrative & support | 2021 |
| Think Trevor James Recruitment Limited | Administrative & support | 2020 |
| Thinkdelta Software Ltd | Information & communication | 2013 |
| Thinking HAT Media Limited | Professional & scientific | 2015 |
| Thinkoutside Ltd | Administrative & support | 2023 |
| Third Wave Sourcing Ltd | Manufacturing | 2026 |
| Thirteen Estates Ltd | Construction | 2017 |
| Thirtythree Developments Limited | Construction | 2021 |
| This and That Home Improvements Ltd | Construction | 2026 |
| This IS Cartel Limited | Wholesale & retail | 2020 |
| This IS ORB Ltd | Information & communication | 2018 |
| Thomas Bell Removals Ltd | Transport & logistics | 2021 |
| Thomas Brothers (Wellington and Taunton) Limited | Extraterritorial | 1995 |
| Thomas Coulborn & Sons Limited | Wholesale & retail | 2011 |
| Thomas Fleming Associates Ltd | Professional & scientific | 2018 |
| Thomas O'Gorman Limited | Professional & scientific | 2017 |
| Thomas Paul Associates Ltd | Real estate | 2019 |
| Thompson Document Solutions Limited | Administrative & support | 2015 |
| Thompson Heaney Retail Limited | Professional & scientific | 2018 |
| Thompson Roderick Limited | Professional & scientific | 2026 |
| Thompson Wealth Partners Limited | Professional & scientific | 2025 |
| Thompson's GAS Service Limited | Professional & scientific | 2015 |
| Thompsons (Busbys) Limited | Professional & scientific | 1906 |
| Thompsons (Funeral Furnishers) Limited | Extraterritorial | 1905 |
| Thompsons (Maguires) Limited | Extraterritorial | 1904 |
| Thompsons (Rimmers) Limited | Extraterritorial | 1918 |
| Thomson CUP LLP | | 2008 |
| Thoracic RAD Ltd | Health & social care | 2025 |
| Thoracic Surgery Clinic Limited | Health & social care | 2020 |
| Thornhill Bridge Ltd | Construction | 2021 |
| Thornhill Capital Holdings Ltd | Financial services | 2026 |
| Thornley Grove Freehold Limited | Households | 2003 |
| Thornview Limited | Other services | 2024 |
| Three Paws Ltd | Professional & scientific | 2023 |
| Three Spires Motor Co.Limited(The) | Administrative & support | 1954 |
| Three Tribes Care Ltd | Health & social care | 2024 |
| Thrive Longevity Limited | Wholesale & retail | 2025 |
| Thrive Psychological Consultancy Ltd | Health & social care | 2023 |
| Thurplas Limited | Manufacturing | 2002 |
| Thurston King Residential Ltd | Real estate | 2025 |
| TI Advice Ltd | Administrative & support | 2017 |
| Ticel Properties Limited | Real estate | 2025 |
| Tickety BOO Franchising Limited | Arts & recreation | 2011 |
| Tico Electrical Installations Ltd | Construction | 2018 |
| Tidream Ltd | Wholesale & retail | 2024 |
| Tierpoint Partners Limited | Administrative & support | 2022 |
| Tiger Computers & Security Ltd | Information & communication | 2012 |
| Tigerlily Aesthetics Ltd | Other services | 2025 |
| Tikka Direct Ltd | Hospitality | 2022 |
| Tikka Town Limited | Hospitality | 2019 |
| Tikvah Hope Sanctuary C.I.C. | Education | 2020 |
| Tili Builders Ltd | Construction | 2014 |
| Tili Investments Ltd | Real estate | 2020 |
| Timber Buildings Limited | Manufacturing | 2012 |
| Timbercroft Consultancy LLP | | 2014 |
| Timberwest Properties Ltd | Real estate | 2008 |
| TIME2TIME Solutions Ltd | Wholesale & retail | 2012 |
| Timeless Automotive Ltd | Wholesale & retail | 2015 |
| Tinbro Properties Limited | Real estate | 2020 |
| Tink N Stink Limited | Wholesale & retail | 2013 |
| Tintagel Tutoring Ltd | Education | 2026 |
| Tiny Tech Tribe Ltd | Information & communication | 2024 |
| Tip-Top Living Limited | Real estate | 2021 |