| Topren Limited | Other services | 2004 |
| Topup Pizza (Dudley) Ltd | Hospitality | 2026 |
| Torabico Ltd | Wholesale & retail | 2026 |
| Torriths Ltd | Transport & logistics | 2019 |
| Tosca Services UK Ltd | Administrative & support | 2000 |
| Tosca Solutions UK Ltd | Administrative & support | 2000 |
| Total Bins UK Limited | Administrative & support | 2021 |
| Total Building Services (West Midlands) Limited | Construction | 2010 |
| Total Construction (Midlands) Limited | Construction | 2017 |
| Total Creative Services Limited | Information & communication | 2026 |
| Total Fleet Holdings and Investments Ltd | Financial services | 2026 |
| Total Flowline Care Limited | Health & social care | 2025 |
| Total Guard Services Ltd | Administrative & support | 2025 |
| Total HGV Support Ltd | Transport & logistics | 2026 |
| Total Home and Garden Services Ltd | Construction | 2026 |
| Total Power Fabrications Limited | Manufacturing | 2018 |
| Total Power Group Limited | Manufacturing | 2016 |
| Total Support and Services Ltd | Wholesale & retail | 2025 |
| Total System Group Limited | Administrative & support | 2019 |
| Total Transit Centre Limited | Water & waste | 2012 |
| Total VRI Limited | Construction | 2017 |
| Totaloperativ Ltd | Transport & logistics | 2014 |
| Tower 23 Capital Ltd | Professional & scientific | 2010 |
| Tower 23 Ltd | Wholesale & retail | 2010 |
| Tower 23 Ventures Ltd | Wholesale & retail | 2019 |
| Tower Hill Fitness Limited | Arts & recreation | 2024 |
| TOWER25 Properties Ltd | Real estate | 2023 |
| Townmills 1913 Limited | Wholesale & retail | 2020 |
| Townscape Solutions Limited | Professional & scientific | 2007 |
| Townsend Care Ltd | Health & social care | 2022 |
| TQD Group Ltd | Transport & logistics | 2025 |
| Trac Air Holdings Limited | Financial services | 2023 |
| Trade Line Services Ltd | Construction | 2025 |
| Transaction Research Limited | Information & communication | 2024 |
| Transcoat Ltd | Administrative & support | 2018 |
| Transformational Technologies Partnership Limited | Education | 2019 |
| Travels and Beyond Ltd | Wholesale & retail | 2025 |
| Traya Physiotherapy & Rehabilitation Ltd | Health & social care | 2026 |
| TRE Amici Pizza UK Ltd | Hospitality | 2025 |
| Trearddur Trades and Services Limited | Construction | 2005 |
| Treasure & Associate Limited | Wholesale & retail | 2021 |
| Treasure IT Solutions Limited | Information & communication | 2013 |
| Treasured Films Limited | Information & communication | 2022 |
| Treating Your Feet Ltd | Health & social care | 2025 |
| Treesales (Hillpool) Limited | Agriculture & fishing | 1980 |
| Treetops Trees Ltd | Construction | 2019 |
| Trenance Veterinary Services Limited | Professional & scientific | 2018 |
| Treo Developments Ltd | Construction | 2024 |
| Tribal Automation Limited | Manufacturing | 2002 |
| Tribe Talhakimt Ltd | Wholesale & retail | 2019 |
| Trice & Allen Ltd | Administrative & support | 2018 |
| Trice and Allen Properties Ltd | Real estate | 2024 |
| Tricom Control Systems Ltd | Manufacturing | 2019 |
| Trident Design and Management Limited | Administrative & support | 2025 |
| Trident Hydro Demolition Limited | Construction | 2010 |
| Triko Ltd | Wholesale & retail | 2019 |
| Trinexa Global Ltd | Transport & logistics | 2025 |
| Trinity 3 Properties Limited | Real estate | 2024 |
| Trinity Carpets Limited | Wholesale & retail | 1984 |
| Trinity Sound Services Ltd | Information & communication | 2025 |
| Trink Jewellery Limited | Manufacturing | 2016 |
| Triple 20 Taxi Cars Ltd | Transport & logistics | 2019 |
| Triple ES Integrated Services UK Ltd | Real estate | 2025 |
| Triple S Properties Ltd | Real estate | 2026 |
| Trojan Bins Limited | Manufacturing | 2012 |
| Tromans Construction Limited | Construction | 2023 |
| Tromans Property Limited | Real estate | 2023 |
| Tronics Limited | Wholesale & retail | 2018 |
| Tropical Wind Ltd | Wholesale & retail | 2023 |
| Truckfix 24\7 Ltd | Wholesale & retail | 2008 |
| Truckman (UK) Limited | Professional & scientific | 2003 |
| Truckman Limited | Extraterritorial | 2010 |
| Trucut Technologies (UK) Limited | Manufacturing | 2000 |
| True Balance Bookkeeping Ltd | Professional & scientific | 2024 |
| True Protection Financial Services Ltd | Financial services | 2020 |
| Truecolour Contractors Ltd | Construction | 2015 |
| Truecolour Holdings and Investments Ltd | Financial services | 2023 |
| Truecolour Property Investments Ltd | Real estate | 2023 |
| Trust Automotive Limited | Administrative & support | 2008 |
| Trusted Hands Care Group Ltd | Administrative & support | 2019 |
| Trusted Hands Supported Living Ltd | Administrative & support | 2020 |
| TS Gym Group Ltd | Administrative & support | 2016 |
| TS Varghese Limited | Health & social care | 2015 |
| TS5 Transport Ltd | Transport & logistics | 2024 |
| TSA Catering Ltd | Other services | 2025 |
| TSG Transport Limited | Transport & logistics | 2014 |
| TSN Trading Limited | Wholesale & retail | 2017 |
| TST Haulage Ltd | Transport & logistics | 2023 |
| Ttec Commercial Properties Ltd | Real estate | 2025 |
| Ttec Developments Limited | Real estate | 2022 |
| Tubefabs (Pipework Logistics) Limited | Administrative & support | 2015 |
| Tudor Court Management Company Limited | Households | 1992 |
| Tudor Global Pro Ltd | Manufacturing | 2025 |
| Tudor Markets Limited | Administrative & support | 2013 |
| Tudor MEP Design Limited | Professional & scientific | 2024 |
| Tulsa Greenwood Investments Ltd | Real estate | 2021 |
| Turbo Business Services Ltd | Administrative & support | 2009 |
| Turf Services Limited | Other services | 2006 |
| Turkish Cutz Scissors Ltd | Other services | 2025 |
| Turtle Ideas Limited | Extraterritorial | 2007 |