| Tarchy Freight Solutions Ltd | Transport & logistics | 2024 |
| Target Action Supplies Ltd | Wholesale & retail | 2016 |
| Target Cars PB Ltd | Transport & logistics | 2024 |
| Target HR and Training Limited | Administrative & support | 2012 |
| Target UK Holdings Limited | Financial services | 2024 |
| Tarifiq Foods Ltd | Wholesale & retail | 2021 |
| Tarka Coombe Landkey Management Company Limited | Households | 2025 |
| Tarlok Limited | Real estate | 2025 |
| Tarma Transport Ltd | Transport & logistics | 2017 |
| Tarnya’S Ltd | Other services | 2025 |
| Tartariadreams Publishing Ltd | Wholesale & retail | 2025 |
| TAS Electrical Services Limited | Construction | 2012 |
| Tash Cuisine Limited | Hospitality | 2021 |
| Task Force (UK) Limited | Administrative & support | 2003 |
| Tasksium Company Ltd | Health & social care | 2023 |
| Taste of Spice MEH Ltd | Hospitality | 2025 |
| Taste of Spice Online Ltd | Hospitality | 2024 |
| Tastegrid Ltd | Hospitality | 2026 |
| Tasty House 2023 Ltd | Hospitality | 2023 |
| Tate & Morgan Limited | Construction | 2015 |
| Tatetawa Limited | Health & social care | 2024 |
| Tathea Ltd | Wholesale & retail | 2020 |
| Tatius Limited | Information & communication | 2012 |
| Tattset Ltd | Information & communication | 2026 |
| Tatu TMT Ltd | Construction | 2024 |
| Taurean Consulting Limited | Professional & scientific | 2015 |
| Taurus Onsite Vehicle Services Ltd | Wholesale & retail | 2024 |
| Tautrimas Medical Consulting Ltd | Health & social care | 2016 |
| Tavan Limited | Hospitality | 2023 |
| Tax Buddy Ltd | Professional & scientific | 2018 |
| Tax Fella Ltd | Professional & scientific | 2024 |
| Taxhive Digital Limited | Information & communication | 2025 |
| Taxi Direct School Transport Ltd | Transport & logistics | 2021 |
| Taxsmart Solutions Limited | Education | 2024 |
| Taxwise Peterborough Limited | Professional & scientific | 2021 |
| Taye Onthego Limited | Hospitality | 2024 |
| Taygo Bren Ltd | Professional & scientific | 2018 |
| Taylor and King Ltd | Real estate | 2021 |
| Taylor Hargreaves Holdings Ltd | Financial services | 2016 |
| Taylor Hargreaves Limited | Financial services | 2001 |
| Taylor Merch Ltd | Wholesale & retail | 2026 |
| Taylor Real Estate Investment Limited | Real estate | 2019 |
| TAZ Beauty London Limited | Other services | 2025 |
| Taze Records Ltd | Wholesale & retail | 2026 |
| TB Investments Ltd | Real estate | 2024 |
| TB Management Accounts Ltd | Professional & scientific | 2025 |
| TB Oaks Ltd | Wholesale & retail | 2023 |
| TB Trans Services Ltd | Transport & logistics | 2019 |
| TB Vivid Kitchens Ltd | Manufacturing | 2015 |
| Tbees Ltd | Other services | 2021 |
| TBQ Nutrition Ltd | Wholesale & retail | 2025 |
| TBS Developments Ltd | Construction | 2015 |
| TC Bidco Limited | Professional & scientific | 2020 |
| TC Bulley Davey Limited | Professional & scientific | 2008 |
| TC CH Limited | Professional & scientific | 2023 |
| TC CH Partnership LLP | | 2023 |
| TC Contracting Specialist Services Limited | Professional & scientific | 2008 |
| TC Craigs Limited | Professional & scientific | 2021 |
| TC East Midlands Limited | Professional & scientific | 2017 |
| TC Topco Limited | Financial services | 2021 |
| TC Traction Limited | Wholesale & retail | 2013 |
| TCAG100 Ltd | Administrative & support | 2024 |
| Tcbd Holdings Limited | Financial services | 2025 |
| Tcct Holdings UK Limited | Administrative & support | 2011 |
| TCG Food Ltd | Hospitality | 2025 |
| Tcgh Holdings Limited | Administrative & support | 2013 |
| TCK Engineering & General Services Ltd | Construction | 2019 |
| TCN Holding Limited | Financial services | 2023 |
| Tcpr Limited | Professional & scientific | 2025 |
| TD Holdings (Peterborough) Limited | Financial services | 2025 |
| TD Hunter Transport Limited | Transport & logistics | 2025 |
| TD Plant Hire Limited | Administrative & support | 2023 |
| TDA Development Limited | Education | 2007 |
| TDA Services Inc Ltd | Administrative & support | 2024 |
| TDG Properties Ltd | Real estate | 2015 |
| TDN Tools Holdings Limited | Financial services | 2021 |
| TDS Contracts (UK) Ltd. | Construction | 2006 |
| TE Peterborough Limited | Construction | 2018 |
| Tea @ 18 Ltd | Hospitality | 2021 |
| Teacher Play Ltd | Education | 2019 |
| Teak & Teak Furniture Ltd | Wholesale & retail | 2026 |
| Teal Cleaning Ltd | Administrative & support | 2019 |
| Team 7 Building Contractors Ltd. | Construction | 2019 |
| Team Flow Analytics Ltd | Information & communication | 2025 |
| Team Gamma Force Limited | Arts & recreation | 2016 |
| Team PIE Properties Limited | Real estate | 2024 |
| Team Plant Limited | Administrative & support | 1979 |
| Team Sportex Ltd | Education | 2021 |
| TEAMCS1 Ltd | Information & communication | 2023 |
| Teapot Music Limited | Arts & recreation | 2007 |
| Tech Admin DK Limited | Information & communication | 2020 |
| Tech Avian Ltd | Wholesale & retail | 2025 |
| Tech Consortium Group Ltd. | Wholesale & retail | 2025 |
| Tech Cross IT Ltd | Information & communication | 2021 |
| Tech Remarket Limited | Wholesale & retail | 2018 |
| Tech Vista Limited | Information & communication | 2023 |
| Tech World Limited | Wholesale & retail | 2024 |
| Tech-Serv Audio Consultants Limited | Arts & recreation | 2003 |
| Techelex Limited | Construction | 2024 |
| Techhive Electronics Ltd | Wholesale & retail | 2026 |