| Trivedi Health Limited | Public administration | 2025 |
| Trizen Development Ltd | Construction | 2026 |
| Trojan Homes Ltd | Construction | 2019 |
| Troman Europa Ltd | Wholesale & retail | 2025 |
| Troncmasters Limited | Information & communication | 2018 |
| Tropical Flavours Truck Limited | Hospitality | 2024 |
| Troublefix Limited | Construction | 2021 |
| Trowik Ltd | Wholesale & retail | 2022 |
| TRP Medical Ltd | Health & social care | 2021 |
| TRS 24/7 Solutions Limited | Administrative & support | 2003 |
| TRS Accountants Ltd | Professional & scientific | 2023 |
| Trtouk Ltd | Professional & scientific | 2023 |
| TRU Ledge Limited | Wholesale & retail | 2024 |
| Tru-Barbers Ltd | Other services | 2017 |
| Tru-Heat Limited | Construction | 2011 |
| Tru-Man Hair Ltd | Wholesale & retail | 2020 |
| Truancy Call Limited | Education | 2000 |
| Truchel Ltd | Construction | 2014 |
| Truckfix (London) Limited | Wholesale & retail | 2007 |
| True Beauty Laser Clinic Ltd | Other services | 2022 |
| True Protect Consulting Limited | Information & communication | 2021 |
| True Religion Limited | Real estate | 2024 |
| True Scale Media Ltd | Professional & scientific | 2025 |
| Truebuild Lofts Ltd | Construction | 2014 |
| Truedfir Ltd | Information & communication | 2025 |
| Truenickle Limited | Arts & recreation | 1991 |
| Truro International Ltd | Construction | 2024 |
| Trushi's Cakes Ltd | Wholesale & retail | 2023 |
| Trushi’S Kitchen Ltd | Wholesale & retail | 2025 |
| Trust Cabs Ltd | Transport & logistics | 2025 |
| Trust Line Electrics Ltd | Construction | 2026 |
| Trusted Bricks Limited | Real estate | 2023 |
| Trustguard Property Ltd | Real estate | 2024 |
| Trusty Transpoter Ltd | Transport & logistics | 2024 |
| Trutec UK Limited | Information & communication | 2013 |
| Truverda Ltd | Wholesale & retail | 2025 |
| Truvien Technologies Limited | Wholesale & retail | 2016 |
| TRV Associates Limited | Administrative & support | 2020 |
| Trvw Investment Ltd | Real estate | 2016 |
| TRY ME Logistics Limited | Transport & logistics | 2025 |
| TS Motor Group Ltd | Wholesale & retail | 2025 |
| TS Painting & Decorating Services Ltd | Construction | 2011 |
| TS Prime Transport Ltd | Transport & logistics | 2026 |
| TSA Dhaliwal LLP | | 2020 |
| Tsar Ltd | Wholesale & retail | 2016 |
| TSG Motors Ltd | Wholesale & retail | 2011 |
| TSG Roofing Limited | Construction | 2024 |
| TSH Berkshire Limited | Education | 2022 |
| TSH Logistics Limited | Transport & logistics | 2026 |
| TSH Unique Services Limited | Construction | 2026 |
| TSK Builders Limited | Construction | 2016 |
| Tskr Fitness 1 Ltd | Arts & recreation | 2024 |
| TSM Transport Ltd | Construction | 2020 |
| TSS Housing Ltd | Real estate | 2022 |
| TSS Sunshine Ltd | Wholesale & retail | 2024 |
| Tsubasa Ltd | Wholesale & retail | 2021 |
| Tsuki Wholesale Limited | Wholesale & retail | 2023 |
| Tsungu Healthcare Ltd | Health & social care | 2013 |
| Tswaha Consulting Limited | Information & communication | 2013 |
| Tsych Transport Ltd | Transport & logistics | 2024 |
| Ttbhf Limited | Hospitality | 2025 |
| Tuaris Limited | Construction | 2022 |
| Tuber Spice Ltd | Wholesale & retail | 2024 |
| Tubifoam Limited | Manufacturing | 1960 |
| Tubwell Store Limited | Wholesale & retail | 2019 |
| TUC Investments Ltd | Real estate | 2026 |
| Tudor Contract Cleaners Limited | Administrative & support | 1995 |
| Tudor Group Ltd | Administrative & support | 2016 |
| Tudor M Construction Ltd | Construction | 2020 |
| Tudor Parcel Logistics Ltd | Transport & logistics | 2024 |
| Tuff Works Ltd | Wholesale & retail | 2014 |
| Tuhi Sahai Limited | Wholesale & retail | 2018 |
| Tuition A-Head Ltd | Education | 2025 |
| Tulip Management Limited | Administrative & support | 2020 |
| Tulip Removals Ltd | Transport & logistics | 2025 |
| Tunbridge Wells Care Centre Limited | Health & social care | 2007 |
| Tuned Integration Ltd | Professional & scientific | 2026 |
| Turbo Dental Laboratory Ltd | Manufacturing | 2023 |
| Turbo Megha Airways Ltd | Manufacturing | 2026 |
| Turbofix Ltd | Manufacturing | 2025 |
| Turkman Express Services Ltd | Wholesale & retail | 2019 |
| Turmeric 20 Ltd | Other services | 2018 |
| Turna Group Limited | Wholesale & retail | 2022 |
| Turner & Price Limited | Wholesale & retail | 1992 |
| Turner Rock Ltd | Real estate | 2008 |
| Turnivo Ltd | Professional & scientific | 2025 |
| Turnstone Residential Ltd | Real estate | 2021 |
| Tutor Guide Limited | Education | 2025 |
| TVK Technologies Ltd | Information & communication | 2015 |
| TW Fibre Solutions Ltd | Information & communication | 2020 |
| TW Shutters Ltd | Manufacturing | 2023 |
| TW Signs & Designs Ltd | Professional & scientific | 2025 |
| TW Statics Limited | Real estate | 2025 |
| TWC Freight & Logistics Ltd | Transport & logistics | 2022 |
| Tweezer Smith Ltd | Wholesale & retail | 2022 |
| Twelve Services Ltd | Hospitality | 2020 |
| Twenty Twenty Maintenance Services Ltd | Professional & scientific | 2018 |
| Twentyfourproperty Ltd | Real estate | 2022 |
| Twentyfourpropertymgmt Ltd | Real estate | 2023 |
| Twentysixandtwo Limited | Wholesale & retail | 2025 |