| TOM Graves Prop Ltd | Real estate | 2022 |
| TOM Graves Property Ltd | Real estate | 2018 |
| TOM Mallion Limited | Information & communication | 2016 |
| TOM Property Limited | Real estate | 2019 |
| TOM Richardson Ltd | Information & communication | 2022 |
| Tomahawk Properties Ltd | Real estate | 2019 |
| Tombstone Limited | Real estate | 1982 |
| Tomlinson Catering Limited | Hospitality | 1982 |
| Tomorrow & Co Productions Ltd | Information & communication | 2016 |
| Tondy’S Doggy Daycare Ltd | Agriculture & fishing | 2025 |
| Tonic Therapy Ltd | Other services | 2017 |
| Tony Allen Direct Cremation Services Limited | Other services | 2025 |
| Tony Clark Sports Limited | Arts & recreation | 1987 |
| TOO Hot Limited | Professional & scientific | 2013 |
| TOO Hot Vintage Limited | Wholesale & retail | 2015 |
| Toolstoleads Ltd | Professional & scientific | 2026 |
| Tooth Path Ltd | Health & social care | 2022 |
| Top Integrated Circuits Ltd | Other services | 2023 |
| Top of the World Property Ltd | Real estate | 2021 |
| Topnotch Hospitality Ltd | Hospitality | 2025 |
| Torbay Dental Limited | Health & social care | 2026 |
| Torbay Dental Property Limited | Real estate | 2026 |
| Torino Ventures Ltd | Information & communication | 2020 |
| Toronto Black Ltd | Information & communication | 2018 |
| Toropito Limited | Health & social care | 2014 |
| Tors Touring LLP | | 2024 |
| Tortoiseshell Kitchens Ltd | Hospitality | 2025 |
| Tosho Limited | Health & social care | 2019 |
| Total Accounts Direct Limited | Professional & scientific | 1999 |
| Total Building & Maintenance Ltd | Construction | 2025 |
| Total Frequency Control Limited | Wholesale & retail | 1988 |
| Totease Mews Freehold Management Limited | Households | 2011 |
| Totease Mews Management Limited | Households | 2011 |
| Totuus Consulting Ltd | Information & communication | 2022 |
| Touche Training Limited | Education | 2011 |
| Touchstone Corporate Limited | Financial services | 2013 |
| Tower Hayes Solar Limited | Energy | 2014 |
| Tower House 9 Ithica Management Ltd | Real estate | 2014 |
| Town & Central Developments Limited | Real estate | 2000 |
| Town & Central Properties Limited | Construction | 1998 |
| Town & City Residential Letting Limited | Real estate | 2013 |
| Town and City Residential Letting and Property Management Ltd. | Real estate | 2015 |
| Town and Country Planning Solutions Limited | Professional & scientific | 2001 |
| Town and Country Property Services Sales Limited | Real estate | 2024 |
| Town Graft Limited | Information & communication | 2025 |
| Town Lighting Consultancy Limited | Other services | 2016 |
| Towns Corner Limited | Wholesale & retail | 2016 |
| Townsman Investments Limited | Real estate | 1954 |
| Toybox Digital Ltd | Other services | 2017 |
| Tozoke Ltd | Wholesale & retail | 2010 |
| TP Dental Limited | Health & social care | 2022 |
| TPA Digital Ltd | Professional & scientific | 2025 |
| TPS Sussex Ltd | Other services | 2012 |
| TRA Property Holdings Limited | Real estate | 2025 |
| Traact Nutrition Kitchen Ltd | Hospitality | 2022 |
| Traact Nutrition Ltd | Hospitality | 2019 |
| Trackgate Properties Limited | Real estate | 2021 |
| Trackside Info Ltd | Administrative & support | 2014 |
| Trade Mark Union Limited | Real estate | 2017 |
| Trade Shutters Wholesale Limited | Wholesale & retail | 2017 |
| Trade Vehicle Services Ltd | Wholesale & retail | 2018 |
| Trading Angel Ltd | Education | 2020 |
| Trail Blazer Pictures Limited | Information & communication | 2009 |
| Tramuntana Solutions Limited | Professional & scientific | 2025 |
| Tranquility Beauty Academy Ltd | Other services | 2025 |
| Translations to Picture Limited | Real estate | 1996 |
| Trapdoor TV Limited | Information & communication | 2025 |
| Traslyn Court Property Management Ltd | Real estate | 2006 |
| Traylings Ltd | Real estate | 2018 |
| Treacle and Ginger Ltd | Wholesale & retail | 2018 |
| Treacy Media Ltd | Information & communication | 2014 |
| Treadaway Financial LLP | | 2022 |
| Tree of Life Centre (Hove) Limited | Real estate | 2015 |
| Tree Sparrow Trade Limited | Wholesale & retail | 2017 |
| Treeaction UK CIC | Professional & scientific | 2019 |
| Trendset Agencies Ltd | Professional & scientific | 2025 |
| Trevor DE Silva Associates Limited | Arts & recreation | 2008 |
| Triassic Stones and Design Private Limited | Wholesale & retail | 2026 |
| Trigwell Interiors Limited | Construction | 2006 |
| Trim and Tonic Hair Ltd | Other services | 2019 |
| Trimmers Hairdressers Ltd | Other services | 2014 |
| Tripamigos Ltd | Administrative & support | 2026 |
| Triple C Hair Salon Ltd | Other services | 2018 |
| Trivista Engineering Limited | Professional & scientific | 2001 |
| Troedyrhiw Productions Ltd | Arts & recreation | 2022 |
| Troika Industries Ltd | Information & communication | 2023 |
| Trojan IP Limited | Other services | 2021 |
| Trojan Services Limited | Professional & scientific | 2000 |
| Tropical Brighton Beach Limited | Administrative & support | 2013 |
| Tropical Sushi Limited | Hospitality | 2015 |
| Tropicalparadisebr Limited | Hospitality | 2024 |
| Trowle Solar Limited | Energy | 2014 |
| TRT Sizinda Camp Ltd | Hospitality | 2022 |
| TRU Growth Advisory Limited | Administrative & support | 2015 |
| TRU Nail Art Ltd | Other services | 2021 |
| True Ideas Limited | Information & communication | 2014 |
| True North Travel Limited | Administrative & support | 2020 |
| True Wellbeing Ltd | Health & social care | 2019 |
| Truman Property Ltd | Real estate | 2019 |
| Trusted Paws Ltd | Information & communication | 2026 |