| TLH Holdings Limited | Financial services | 2025 |
| TMT Construction Limited | Construction | 2017 |
| TMW Construction Ltd | Construction | 2023 |
| TNZ Investments Ltd | Construction | 2023 |
| TOM Ingram Motorsport Limited | Arts & recreation | 2012 |
| TOM Smith Tattoo Ltd | Arts & recreation | 2024 |
| Tonewood Limited | Water & waste | 1997 |
| Tony James Designs Ltd | Wholesale & retail | 2012 |
| Top Banana Rehearsal Studios Limited | Arts & recreation | 2008 |
| Top Box Studios Ltd | Arts & recreation | 2021 |
| Top Coat Services Ltd | Construction | 2016 |
| Top One Percent Ltd | Information & communication | 2015 |
| Top Service (Holdings) Limited | Real estate | 1998 |
| Top Service (HR &Training) Limited | Administrative & support | 2004 |
| Top Service Limited | Administrative & support | 1998 |
| Top Service Trading Group (Holdings) Limited | Financial services | 2018 |
| Topgear Rentals Ltd | Administrative & support | 2006 |
| Torn and Frayed Ltd | Education | 2014 |
| Torque Speed Ltd | Wholesale & retail | 2019 |
| Total Construction Training Ltd | Administrative & support | 2011 |
| Total Control Technologies Ltd | Administrative & support | 2006 |
| Total Exterior Cleaning Solutions Limited | Administrative & support | 2020 |
| Total Talent Group Ltd | Arts & recreation | 2023 |
| Totally High Level Ltd | Professional & scientific | 2015 |
| Totally Nourish Limited | Extraterritorial | 2004 |
| Touchwood Houses Ltd. | Hospitality | 2016 |
| TOW EYE Covers UK Ltd | Manufacturing | 2025 |
| Toy Properties Ltd | Real estate | 2017 |
| Tracecourse Ltd | Real estate | 2017 |
| Tracsport Ltd | Manufacturing | 2013 |
| Trade 2 Trade Redditch Ltd | Wholesale & retail | 2025 |
| Trade Interior Solutions Limited | Construction | 2019 |
| Trade Solar Distribution Limited | Wholesale & retail | 2024 |
| Tradechoice Distribution Limited | Administrative & support | 2016 |
| Trademark Aquatics Ltd | Wholesale & retail | 2010 |
| Traditional Timber Solutions Ltd | Construction | 2026 |
| Trafalgar Legacy Ltd | Real estate | 2014 |
| Trafficsnap Ltd | Information & communication | 2016 |
| Tragar Homes Limited | Real estate | 2017 |
| Tragar Land Limited | Real estate | 2024 |
| Training Investments Two Limited | Education | 2021 |
| Trans ION Erik Limited | Transport & logistics | 2017 |
| Trans KEV Line Ltd | Wholesale & retail | 2020 |
| Transcall Limited | | 1977 |
| Transcom Services Ltd | Professional & scientific | 2020 |
| Translift Bendi Driver Training Ltd | Transport & logistics | 2000 |
| Translift Bendi Limited | Manufacturing | 1965 |
| Translift Group of Companies Limited | Manufacturing | 2021 |
| Translift Holdings 25 Limited | Financial services | 2025 |
| Translift Properties Limited | Real estate | 1996 |
| Translift Rentals Limited | Administrative & support | 2015 |
| Transport Logistics Miko Ltd | Transport & logistics | 2021 |
| Trasportreinaldobircina Ltd | Transport & logistics | 2025 |
| Travel Monkey Ltd | Administrative & support | 2024 |
| Travers Holdings Ltd | Financial services | 2018 |
| Treble R Fabrications Limited | Manufacturing | 2017 |
| Tredz Limited | Professional & scientific | 2004 |
| Treemendus Tree Services Ltd | Administrative & support | 2021 |
| Trees N Gardens Limited | Administrative & support | 2018 |
| Trellidor UK Limited | Financial services | 2020 |
| Tria Prima Limited | Administrative & support | 2014 |
| Triac Air Conditioning Service Limited | Real estate | 1997 |
| Tricklebank Property Ltd | Real estate | 2019 |
| Trident Controls Ltd | Construction | 2025 |
| Trim UP Ltd | Other services | 2024 |
| Trimite BID Co Limited | Manufacturing | 2017 |
| Trimite Global Coatings Group Limited | Other services | 2017 |
| Trimite Global Coatings Limited | Manufacturing | 2008 |
| Trimite Limited | Manufacturing | 1981 |
| Trimite Top Co Limited | Manufacturing | 2017 |
| Trio Calc Limited | Professional & scientific | 2025 |
| Tripeze Ltd | Professional & scientific | 2025 |
| Triyos Limited | Financial services | 2022 |
| TRJ Engineering UK Limited | Manufacturing | 2023 |
| Tropic Ltd | Other services | 2003 |
| Trotman's Independent Traders Limited | Real estate | 2024 |
| TRS Removals Limited | Transport & logistics | 2003 |
| TRT Lighting Limited | Manufacturing | 2012 |
| Truck Refrigeration Parts Ltd | Wholesale & retail | 2022 |
| True Vape Redditch Ltd | Wholesale & retail | 2017 |
| Truetidy Services Ltd | Administrative & support | 2026 |
| Trumper Bros. Limited | Wholesale & retail | 1970 |
| Trusimo Cars Limited | Wholesale & retail | 2025 |
| Trusted Global Protection Ltd | Administrative & support | 2022 |
| Truth Holdings Unlimited | Administrative & support | 2016 |
| Tryfan Models Limited | Manufacturing | 2016 |
| TS Quality Services Ltd | Professional & scientific | 2013 |
| TSB Events Ltd | Administrative & support | 2025 |
| TSC Venues Ltd | Information & communication | 2005 |
| Tscleans Ltd | Administrative & support | 2025 |
| Tsco Limited | Wholesale & retail | 2005 |
| TSR Electrical Ltd | Construction | 2016 |
| TSS360 Limited | Professional & scientific | 2025 |
| TTK Automotive Ltd | Wholesale & retail | 2026 |
| TTT3 Ltd | Professional & scientific | 2024 |
| TU Fitness Ltd | Arts & recreation | 2025 |
| Tubbnet Ltd | Information & communication | 2024 |
| Tulu Construction Limited | Wholesale & retail | 2024 |
| Tunnel Barn Farm Tackle Limited | Wholesale & retail | 2006 |
| Turner Construction Plant Hire Limited | Administrative & support | 2019 |