| Swag Boutique Limited | Wholesale & retail | 2019 |
| Swan-Horton & Balding Limited | Wholesale & retail | 2016 |
| Sweaty Feelings Ltd | Professional & scientific | 2024 |
| Swift Boilers Ltd | Construction | 2017 |
| Swift Medical Supplies Limited | Other services | 2010 |
| Swift Medical Trolleys Limited | Extraterritorial | 2009 |
| SWM Sales Ltd | Real estate | 2025 |
| Synapse Action Learning UK Limited | Information & communication | 2012 |
| Synergy Connect Limited | Administrative & support | 2023 |
| Syrinx Systems Limited | Information & communication | 2011 |
| T & B Blasting Services Limited | Manufacturing | 2004 |
| T H Autos Limited | Wholesale & retail | 2019 |
| T R Scott Estates Limited | Construction | 2018 |
| T R Scott Properties Limited | Construction | 2016 |
| T W Builders Ltd | Construction | 2004 |
| T2N International Limited | Information & communication | 1998 |
| T4EGROUP Ltd | Hospitality | 2025 |
| Tablets 4 Less Limited | Wholesale & retail | 2008 |
| Tadaah Limited | Wholesale & retail | 2016 |
| Tala Holdings Ltd | Financial services | 2024 |
| Talavera Risk Management Ltd | Administrative & support | 2022 |
| Talbot Tyres Ltd | Wholesale & retail | 2011 |
| Tall Orders (Thetford) Ltd | Hospitality | 2022 |
| Talo Takeaway Limited | Hospitality | 2025 |
| TAS Valley Developments Limited | Construction | 2015 |
| Taylors Properties (Thetford) Limited | Real estate | 2023 |
| Taylors Solid Fuels Limited | Administrative & support | 2002 |
| TDL GAS Services Limited | Other services | 2013 |
| Team C Express Logistics Ltd | Transport & logistics | 1997 |
| Team C Logistics Limited | Transport & logistics | 2004 |
| Team Ventures Ltd. | Administrative & support | 2001 |
| Techno Build Properties Limited | Real estate | 2024 |
| Techpoint Group Ltd | Financial services | 2020 |
| Techpoint Shared Services Limited | Manufacturing | 2002 |
| Temis Holding Limited | Financial services | 2024 |
| Temperature Management Group Ltd | Energy | 2018 |
| Tent King Ltd | Administrative & support | 2023 |
| TER Building Energy Ltd | Professional & scientific | 2018 |
| Terry's Butchers Limited | Wholesale & retail | 2006 |
| Textile Fusion Ltd | Manufacturing | 2025 |
| Tfca (2003) Limited | Manufacturing | 2003 |
| THE Batting Bunny Corporation Limited | Wholesale & retail | 2003 |
| THE Beauty Room & Redrocket Studio Ltd | Other services | 2025 |
| THE Bridge Tavern Thetford Limited | Hospitality | 2020 |
| THE Canine Confidant Ltd | Other services | 2023 |
| THE Caxton Trust | Education | 1997 |
| THE Coaching & Therapy Hub CIC | Other services | 2025 |
| THE Electric Widget Company Limited | Manufacturing | 2007 |
| THE FUN Food Family Ltd | Professional & scientific | 2012 |
| THE Gables Passageway Limited | Households | 2020 |
| THE Gingerbread Group Limited | Manufacturing | 2015 |
| THE Glebe Residents Association Limited | Households | 2025 |
| THE Green Property Limited | Real estate | 2024 |
| THE Letton Hall Trust | Other services | 2021 |
| THE Loan Club Limited | Financial services | 2018 |
| THE Lotus Academy Trust Ltd | Education | 2019 |
| THE Mindful Life Group CIC | Health & social care | 2023 |
| THE Norfolk Arborist Ltd | Agriculture & fishing | 2019 |
| THE Norfolk Gift Company Ltd | Wholesale & retail | 2022 |
| THE Norfolk Groom Shed Limited | Other services | 2018 |
| THE Ophelia Collective Ltd | Wholesale & retail | 2023 |
| THE Organic Feed Company Ltd. | Extraterritorial | 1998 |
| THE Organic Horse Feed Company Ltd. | Extraterritorial | 1999 |
| THE Osteopathic Clinic Norfolk Limited | Health & social care | 2020 |
| THE Over 30S Club Ltd | Arts & recreation | 2025 |
| THE PEE Patch Ltd | Manufacturing | 2024 |
| THE Portuguese Offer, International Trade Exchange CIC | Administrative & support | 2024 |
| THE Print Boutique Ltd | Professional & scientific | 2025 |
| THE Regulated Care App Limited | Public administration | 2024 |
| THE Royal George (Barningham) Limited | Hospitality | 2006 |
| THE Thorpe Woodlands Adventure Centre Trust | Education | 2012 |
| THE VA Partnership Limited | Administrative & support | 2009 |
| THE Wayland Partnership Development Trust | Education | 1999 |
| THE White Hart Free House Ltd | Hospitality | 2020 |
| Thetford Autoparts Limited | Wholesale & retail | 2013 |
| Thetford Autos Ltd | Wholesale & retail | 2025 |
| Thetford Car Sales Ltd | Wholesale & retail | 2025 |
| Thetford Caravan Services Ltd | Manufacturing | 2012 |
| Thetford Carpet Warehouse Limited | Wholesale & retail | 2014 |
| Thetford Catering Ltd | Hospitality | 2025 |
| Thetford Compactors Finance Limited | Administrative & support | 1981 |
| Thetford Developments Ltd | Real estate | 2021 |
| Thetford Educational Trustee Limited | Administrative & support | 2020 |
| Thetford Grammar School Limited | Education | 2017 |
| Thetford Guns & Country Clothing Limited | Wholesale & retail | 2009 |
| Thetford Healthcare C.I.C. | Health & social care | 2011 |
| Thetford Heritage Trust | Health & social care | 2026 |
| Thetford Homes Limited | Real estate | 2026 |
| Thetford International Compactors Limited | Manufacturing | 1969 |
| Thetford International Compactors Service Limited | Manufacturing | 1977 |
| Thetford International Limited | Professional & scientific | 2015 |
| Thetford International Products Limited | Wholesale & retail | 1982 |
| Thetford Moulded Products Ltd | Extraterritorial | 1992 |
| Thetford Moulded Products Trustees Limited | Extraterritorial | 1990 |
| Thetford Osteopaths Limited | Health & social care | 2001 |
| Thetford Plant and Tool Hire Limited | Administrative & support | 2024 |
| Thetford Pool Club Ltd | Arts & recreation | 2025 |
| Thetford Property Services Limited | Other services | 2014 |
| Thetford Rugby Club Land Holdings Limited | Real estate | 2020 |
| Thetford Rugby Football Club Limited | Arts & recreation | 2020 |