| Thetford Takeout Limited | Hospitality | 2021 |
| Thetford Test Centre Ltd | Wholesale & retail | 2015 |
| Thetford Tyres Limited | Wholesale & retail | 2025 |
| Thetford Windows Ltd | Construction | 2025 |
| Thoroughbred Limited | Wholesale & retail | 2026 |
| Tidy Construction Ltd | Construction | 2004 |
| Tiger East Anglia Ltd | Hospitality | 2022 |
| Tikke's Ltd | Transport & logistics | 2024 |
| TIM Soar Gallery Limited | Professional & scientific | 2003 |
| Timberlines (Anglia) Limited | | 1986 |
| Tipsy Toad Taverns Limited | Hospitality | 1989 |
| Titanic Films Limited | Arts & recreation | 1998 |
| Title Merchandise Ltd | Manufacturing | 2021 |
| TJB Carpentry Ltd | Construction | 2016 |
| TKV Transport Ltd | Transport & logistics | 2021 |
| TNS Trans Ltd | Transport & logistics | 2025 |
| TNT Civils Ltd | Construction | 2015 |
| Toffee Properties Limited | Real estate | 2024 |
| TOM & G'S Ltd | Hospitality | 2024 |
| TOM T TM Limited | Construction | 2024 |
| Tomage Properties Ltd | Real estate | 2025 |
| Tomco Limited | Construction | 1998 |
| Top Cook Foods Limited | Extraterritorial | 2004 |
| Top Garage and MOT Centre Ltd | Wholesale & retail | 2022 |
| Top Gear Auto Repairs Ltd | Wholesale & retail | 2025 |
| Topper Software Ltd | Information & communication | 2022 |
| Tornado Event Hire Ltd | Wholesale & retail | 2010 |
| Total Eco Services Ltd | Administrative & support | 2025 |
| Total Traffix Solutions Ltd | Construction | 2023 |
| Total Transport Management Ltd | Transport & logistics | 2017 |
| Tower Crane Asset Management Holdings Limited | Administrative & support | 2006 |
| TP TEC Solutions Ltd | Professional & scientific | 2023 |
| Trademate Windows Limited | Construction | 2001 |
| Trafford Tiling Limited | Construction | 2003 |
| Tramlines Agritech Limited | Professional & scientific | 2024 |
| Transformita Ltd | Information & communication | 2023 |
| Transport G Ltd | Transport & logistics | 2025 |
| Transylvania Food Store Ltd | Wholesale & retail | 2020 |
| Traquinas Club Limited | Health & social care | 2022 |
| Traquinas Holdings Limited | Financial services | 2019 |
| Traquinas Limited | Health & social care | 2012 |
| Traquinas Mulberry Ltd | Health & social care | 2026 |
| TRC Roofing Limited | Construction | 2001 |
| Treecreeper Rustics Ltd | Arts & recreation | 2021 |
| Trell Contractors (Watton) Limited | Construction | 1976 |
| Trell Developments Ltd | Construction | 2015 |
| Trell Energy Construction UK Ltd | Construction | 2024 |
| Trell Farms Ltd | Agriculture & fishing | 2017 |
| Trell Properties Limited | Construction | 2018 |
| Trevor Vaughan Ltd | Manufacturing | 2015 |
| Tricell Solutions Limited | Wholesale & retail | 2023 |
| Trio Nest Ventures Limited | Real estate | 2025 |
| Troy London Merchandise Limited | Manufacturing | 2013 |
| TRU Transport Ltd | Wholesale & retail | 2023 |
| Trucore Solutions Ltd | Wholesale & retail | 2025 |
| Truelight Electrical Ltd | Construction | 2026 |
| TSK IT Solutions Ltd | Wholesale & retail | 2023 |
| Tudorel Construction Ltd | Other services | 2012 |
| Tuffa Footwear Ltd | Wholesale & retail | 2013 |
| Twelve Trees Leisure Ltd | Arts & recreation | 2024 |
| Tyger Construction Ltd | Construction | 2015 |
| Tyges Ltd | Wholesale & retail | 2018 |
| Tyrrell & Company Independent Financial Advisers LLP | | 2007 |
| U R One in a Million Limited | Extraterritorial | 2013 |
| Ubique Engineering Services Limited | Professional & scientific | 2022 |
| Ubuntu Learning Ltd | Education | 2020 |
| UK Butterfly Ltd | Education | 2014 |
| Unimpossible Consultants Limited | Information & communication | 2022 |
| Unique Computers Norfolk Ltd | Wholesale & retail | 2015 |
| Unique Orders Ltd | Wholesale & retail | 2019 |
| United Flyball - Outdoor Limited | Education | 2025 |
| United Kingdom Firefighters Sailing Championship | Public administration | 2023 |
| Urban Blooms East Anglia Ltd | Administrative & support | 2026 |
| Urban Dog Adventures Ltd | Other services | 2026 |
| Utopia Care Limited | Health & social care | 2022 |
| Utopia Care Thurrock Ltd | Health & social care | 2023 |
| UUF Ltd | Hospitality | 2018 |
| V J Commercials Transport Ltd | Transport & logistics | 2020 |
| V&M Smartaccess Ltd | Construction | 2025 |
| Vani Sankar Limited | Health & social care | 2026 |
| Vanquishinvest Ltd | Real estate | 2020 |
| Vaping Heaven Ltd | Wholesale & retail | 2021 |
| Vehicle Technology Limited | Manufacturing | 1983 |
| Ventura Builders Limited | Construction | 2014 |
| Vertexa Ltd | Wholesale & retail | 2025 |
| Vertumno Ltd | Wholesale & retail | 2024 |
| Vickers Motors Limited | Wholesale & retail | 2006 |
| Victory Auto Repair Ltd | Wholesale & retail | 2026 |
| Viking Global Financials Limited | Financial services | 2018 |
| Virginijus M Limited | Administrative & support | 2025 |
| Viribus Holdings Limited | Financial services | 2018 |
| Vision Rise Fitness Ltd | Health & social care | 2025 |
| Visionista Collective Ltd | Real estate | 2026 |
| Vitela Direct Ltd | Wholesale & retail | 2021 |
| Vmip Wholesale Ltd | Wholesale & retail | 2025 |
| Voronina Limited | Other services | 2018 |
| W.Stainforth & Son,Limited | Real estate | 1946 |
| W3 Analytics Ltd | Information & communication | 2026 |
| Wadd Scaffolding Ltd | Construction | 2024 |
| Waddingham Developments Ltd | Construction | 2023 |