| Trinity Properties (Bournemouth) Ltd | Real estate | 2012 |
| Trinity Vision Ltd | Arts & recreation | 2025 |
| Triple a Fire & Electrical Limited | Construction | 2006 |
| Triple a GAS Ltd | Construction | 2023 |
| Triple a Property Improvements Ltd | Construction | 2025 |
| Triple Black Limited | Real estate | 2017 |
| Triple C Autos Ltd | Wholesale & retail | 2023 |
| Triple Eight Investments Ltd | Administrative & support | 2006 |
| Triple Helix Limited | Information & communication | 2008 |
| Triple J Consult Ltd | Professional & scientific | 2024 |
| Tristar Recruitment Limited | Administrative & support | 2016 |
| Tritons Sports Tours Ltd | Administrative & support | 2024 |
| Triveni Vastra Ltd | Wholesale & retail | 2026 |
| Trixel Tech Ltd | Information & communication | 2026 |
| TRL 2019 Limited | Extraterritorial | 2019 |
| Troika Developments Limited | Construction | 1970 |
| Troika Eastleigh Properties Limited | Construction | 2013 |
| Troika Estates Limited | Real estate | 1988 |
| Troika Group Limited | Real estate | 1988 |
| Troika Project Management Limited | Real estate | 1986 |
| Troika Properties Limited | Real estate | 1984 |
| Troika Property Holdings Limited | Real estate | 1984 |
| Troy Restaurant Ltd | Administrative & support | 2017 |
| TRS Boutique Limited | Wholesale & retail | 2025 |
| TRS Music Ltd | Information & communication | 2025 |
| True Brands Limited | Wholesale & retail | 2008 |
| True Gents Barbers Limited | Other services | 2018 |
| True Lovers Knot Ltd | Hospitality | 2026 |
| True Medica Limited | Real estate | 2010 |
| True Value Limited | Wholesale & retail | 2024 |
| True Yellowpill Ltd | Wholesale & retail | 2026 |
| Trueline Home Solutions Limited | Construction | 2025 |
| Truetastevzla Ltd | Hospitality | 2024 |
| Trueview Installations Ltd | Construction | 2023 |
| Truly Ethical Homes Limited | Real estate | 2026 |
| Truman 17 Residents Limited | Households | 2019 |
| Truman Management Limited | Hospitality | 2026 |
| Truskawka Ltd | Wholesale & retail | 2025 |
| Trust Parcel Experts Ltd | Transport & logistics | 2018 |
| Trusted Dwelling Ltd | Extraterritorial | 2025 |
| Trustedpartnr Ltd | Construction | 2025 |
| Trusttwinkle Ltd | Arts & recreation | 2024 |
| Truth Leisure Ltd | Hospitality | 2020 |
| TRX Management Ltd | Information & communication | 2020 |
| TS MIA Nails Limited | Other services | 2025 |
| TS N TS Hospitality Limited | Hospitality | 2026 |
| TSD Sports Ltd | Wholesale & retail | 2019 |
| TSP Thai Boxing Ltd | Arts & recreation | 2024 |
| TSR Education Ltd | Administrative & support | 2017 |
| Tstreams Limited | Information & communication | 2021 |
| Tsuri Sushi Ltd | Hospitality | 2025 |
| TT9 Esports Ltd | Arts & recreation | 2021 |
| TTG Portsmouth Limited | Administrative & support | 2023 |
| Tubelight Cleaning Ltd | Administrative & support | 2025 |
| Tuckers & Associates Limited | Professional & scientific | 1999 |
| Tuckton Dental Hygienist/Therapist and Aesthetics Limited | Health & social care | 2024 |
| Tuckton Investments Limited | Real estate | 2023 |
| Tuckton Mews Management Company Limited | Real estate | 2021 |
| Tuckton Pharmacy Limited | Wholesale & retail | 2011 |
| Tuckton Place (Bournemouth) Limited | Households | 2013 |
| Tuckton Superstore Ltd | Wholesale & retail | 2026 |
| Tudalweb Limited | Hospitality | 1978 |
| Tudor Court (21) Management Company Limited | Households | 2006 |
| Tudor Court Management (Bournemouth) Limited | Households | 1993 |
| Tudor Estates Ltd | Real estate | 2021 |
| Tudor Estates Poole Ltd | Real estate | 2024 |
| Tuile.Co.Uk Limited | Wholesale & retail | 2011 |
| Tulip Print Ltd | Manufacturing | 2014 |
| Tulseglen Construction Limited | Construction | 1992 |
| Tumms Prime Ltd | Hospitality | 2025 |
| Tunnel Safe Limited | Professional & scientific | 2011 |
| TUP Holdings Ltd | Financial services | 2024 |
| Tur-Ran Motors Limited | Wholesale & retail | 2026 |
| Turay Commercial Ltd | Wholesale & retail | 2022 |
| Turay Homes Ltd | Hospitality | 2016 |
| Turbine Support (2017) Ltd | Manufacturing | 2017 |
| Turbine Support (IW) Limited | Professional & scientific | 2007 |
| Turbine Support Limited | Manufacturing | 1981 |
| Turbocabs Ltd | Transport & logistics | 2024 |
| Turk Hairline Ltd | Hospitality | 2023 |
| Turn 4 Solutions Ltd | Real estate | 2021 |
| Turnberry Project Management Ltd | Professional & scientific | 2014 |
| Turner Motor Group Ltd | Wholesale & retail | 2025 |
| Turning Point Church | Other services | 2013 |
| Turnpoint Ltd | Professional & scientific | 2016 |
| Turnstone Practice Limited | Real estate | 2021 |
| Turon Limited | Hospitality | 2017 |
| Turquoise Holdings Limited | Financial services | 2018 |
| Turquoise Homes Limited | Construction | 2017 |
| Turtle Group Southern Ltd. | Hospitality | 2019 |
| Tuscany Blinds & Shutters Limited | Other services | 2014 |
| Tusk Group Holdings Limited | Extraterritorial | 1997 |
| Tuxops Ltd | Information & communication | 2025 |
| TVL Cars Ltd | Wholesale & retail | 2026 |
| TWC Developments Limited | Construction | 2007 |
| Twelve Holdings Ltd | Hospitality | 2017 |
| Twen Ltd | Information & communication | 2025 |
| Twenty First Century Leisure Limited | Arts & recreation | 1999 |
| Twenty Twenty Four Properties Limited | Real estate | 2024 |
| TWENTY7TEC Bidco Ltd | Financial services | 2024 |