| Trojan Property Investment Management (Lpim) LLP | | 2019 |
| Trojan Property Investments 1 Limited | Financial services | 2019 |
| Trojan UK Property Investments 1 LP | | 2019 |
| Trol Ltd | Information & communication | 2009 |
| Trol Properties Ltd | Real estate | 2024 |
| Trophy Pet Foods Peterborough & District Ltd | Wholesale & retail | 2016 |
| Tropical Tans 2023 Ltd | Other services | 2023 |
| Trowell Stores Ltd | Wholesale & retail | 2024 |
| Troylin Hands of Hope and Mental Wellbeing CIC | Education | 2025 |
| TRS Builders Ltd | Construction | 2025 |
| Trsao Limited | Wholesale & retail | 2024 |
| Trsdigital Limited | Information & communication | 2012 |
| Trubuild Group Ltd | Construction | 2020 |
| Trucare Community Care Ltd | Health & social care | 2023 |
| Trucare Medical Partners Ltd | Health & social care | 2024 |
| Truck (UK) Limited | Administrative & support | 2009 |
| Truck Logic Limited | Professional & scientific | 2022 |
| Truck Radio Limited | Information & communication | 2022 |
| Truck World (UK) Ltd | Wholesale & retail | 2011 |
| Trucklink Commercials Limited | Real estate | 1973 |
| Trucklink Solutions Ltd | Transport & logistics | 2014 |
| True Gents Ltd | Other services | 2022 |
| True North Accounting Solutions Ltd | Financial services | 2025 |
| True North Adventure Vans Ltd | Administrative & support | 2025 |
| True Profit Ltd | Professional & scientific | 2024 |
| True Skin and Laser Limited | Other services | 2023 |
| Truglaze Windows and Doors Limited | Construction | 2017 |
| Trumland House Estates Limited | Real estate | 2003 |
| Truopne Ltd | Transport & logistics | 2023 |
| Trusley Property Group Ltd | Real estate | 2019 |
| Trust Cars Cambs Ltd | Wholesale & retail | 2025 |
| Trust Faith IT Limited | Information & communication | 2016 |
| Trust Homecare Solution Peterborough Ltd | Health & social care | 2023 |
| Trust Point Recruitment Limited | Administrative & support | 2025 |
| TRUST2MAID Ltd | Administrative & support | 2016 |
| Trymyryde Ltd | Transport & logistics | 2016 |
| TS Building Contractors Limited | Construction | 2009 |
| TS PB Ltd | Wholesale & retail | 2025 |
| TS Speed Ltd | Transport & logistics | 2022 |
| TSA Spalding Ltd | Hospitality | 2020 |
| Tsuk Education Services | Education | 2019 |
| TT Sales Ltd | Professional & scientific | 2024 |
| TT Trackway Limited | Administrative & support | 2022 |
| Tt&A Limited | Real estate | 2022 |
| TTB Cleaning Service Ltd | Administrative & support | 2021 |
| Ttcarandvansales Ltd | Wholesale & retail | 2025 |
| TTM Lunga Ltd | Health & social care | 2019 |
| TTN Global Express PVT Ltd | Real estate | 2025 |
| TU Danse Academy Limited | Education | 2025 |
| TU Danse Studios (UK) Limited | Education | 2015 |
| Tuana Oundle Ltd | Hospitality | 2025 |
| Tudor Prestige Ltd | Wholesale & retail | 2022 |
| Tudor Progressions Ltd | Real estate | 2023 |
| Tudor Properties (Peterborough) Ltd | Mining & quarrying | 2003 |
| Tudor Reach Residents Management Company Limited | Households | 2020 |
| Tuesdays (Midco) Limited | Hospitality | 2014 |
| Tuity Ltd | Education | 2024 |
| Tukas Limited | Transport & logistics | 2015 |
| Tulaa Travel Concierge Services Limited | Administrative & support | 2025 |
| Tulia West Cape Ltd | Wholesale & retail | 2021 |
| Tulinga Couriers Ltd | Transport & logistics | 2015 |
| Tulip Dental Ltd | Health & social care | 2023 |
| Tulip Garden Ltd | Transport & logistics | 2024 |
| Tulpe Limited | Transport & logistics | 2024 |
| Tunaria Investments Unlimited | Financial services | 2024 |
| Tundra Cold Stores & Freezers Ltd | Administrative & support | 2021 |
| Tungsten Tales Ltd | Professional & scientific | 2024 |
| Tunnel.Bee Ltd | Wholesale & retail | 2025 |
| Tunns Yard Management Company Limited | Real estate | 2001 |
| TUP Properties Ltd | Construction | 2022 |
| Turans Ltd | Transport & logistics | 2018 |
| Turing Technology Solutions Limited | Information & communication | 2017 |
| Turkish KP Ltd | Hospitality | 2024 |
| Turner Bespoke Homes Ltd | Construction | 2025 |
| Turner Commercials Ltd | Wholesale & retail | 2021 |
| Turner Enterprises Limited | Construction | 1982 |
| Turner Powertrain Systems Limited | Administrative & support | 1995 |
| Turner Towers Ltd | Real estate | 2026 |
| Turning American LLP | | 2026 |
| Turton Actuarial Services Ltd | Professional & scientific | 2025 |
| Turton Property Services Ltd | Households | 2025 |
| Turves Farms Limited | Agriculture & fishing | 2017 |
| Tusense Holdings Ltd. | Information & communication | 2016 |
| Tushingham Holdings Ltd | Manufacturing | 2021 |
| Tushingham Steel Fabricators Ltd | Manufacturing | 2013 |
| Tustorr Properties Ltd | Real estate | 2021 |
| TW Dental Services Limited | Health & social care | 2022 |
| TWB Cambs Ltd | Other services | 2024 |
| TWC the Window Cleaner Limited | Administrative & support | 2021 |
| Twelve Facilities Limited | Administrative & support | 2018 |
| TWELVE19STYLES Collectives Ltd | Wholesale & retail | 2026 |
| TWELVE32 Ltd | Information & communication | 2026 |
| Twelvecare Medicals Ltd | Health & social care | 2026 |
| Twenty Seven Solutions Limited | Information & communication | 2020 |
| TWENTY47 Group Limited | Financial services | 2015 |
| TWENTY87 Limited | Administrative & support | 2025 |
| TWG Electrical Solutions Ltd | Construction | 2026 |
| Twice Trendy Limited | Wholesale & retail | 2025 |
| Twigden-Kaye Joinery and Construction Limited | Construction | 2016 |
| Twin Flame Heating Ltd | Energy | 2025 |