| THE Sun Network Cambridgeshire and Peterborough Community Interest Company | Health & social care | 2018 |
| THE Systems Connective Ltd | Other services | 2025 |
| THE Tapastry Limited | Manufacturing | 2014 |
| THE Tasty Grove Ltd | Hospitality | 2025 |
| THE Terra Nova Precision Ltd | Wholesale & retail | 2026 |
| THE Toy Chest by DH CIC | Wholesale & retail | 2025 |
| THE Traditional Jolly Sailor Ltd | Hospitality | 2024 |
| THE Udder Pre-School Day Nursery Limited | Education | 2014 |
| THE Ultimate Big KID Ltd | Wholesale & retail | 2024 |
| THE Unity Media Private Limited | Professional & scientific | 2022 |
| THE Unknown Lifestyle Ltd | Arts & recreation | 2024 |
| THE Vineries Management Company Limited | Households | 1988 |
| THE Warboys Fade Ltd | Other services | 2026 |
| THE Warthog Real Estates Ltd | Real estate | 2024 |
| THE White Horse Press LLP | | 2016 |
| THE Willingale Shop Limited | Wholesale & retail | 2020 |
| THE Windowmen Limited | Construction | 2025 |
| THE Wolves DEN A.B.C CIC | Education | 2025 |
| THE Yard Pringle Farm Ltd | Wholesale & retail | 2021 |
| Theia Solutions Limited | Professional & scientific | 2020 |
| Thenotebookco Limited | Financial services | 2008 |
| Thephoenixgrps Ltd | Wholesale & retail | 2025 |
| Therapy 4 Backs Limited | Health & social care | 2011 |
| Therapy Avenue Ltd | Public administration | 2022 |
| Thermal Scope Ltd | Professional & scientific | 2023 |
| Thhc Group Ltd | Health & social care | 2021 |
| Thhc Huntingdon Ltd | Administrative & support | 2019 |
| Thhc ST Neots Ltd | Administrative & support | 2021 |
| Thin Film Solutions Ltd | Professional & scientific | 2001 |
| Think Joinery Ltd | Extraterritorial | 2020 |
| Thinking 4 Limited | Information & communication | 2011 |
| Thomas Brown Project Services Ltd | Administrative & support | 2019 |
| Thomas Development & Construction Consultancy Ltd | Professional & scientific | 2021 |
| Thomaswilliamfitness Ltd | Extraterritorial | 2024 |
| Thompson DRY Lining Company Limited | Construction | 1974 |
| Thompson RIG and Welding Services Limited | Mining & quarrying | 2016 |
| Thorney Rugby Union Football Club Limited | Arts & recreation | 2019 |
| Three Sail Limited | Information & communication | 2011 |
| Thrive Financial Coaching Limited | Education | 2025 |
| Thrive Therapy Ltd | Professional & scientific | 2023 |
| Thriving Together Community C.I.C. | Health & social care | 2025 |
| Tiana's Desserts Ltd | Manufacturing | 2025 |
| TIC Construction Group Ltd | Construction | 2026 |
| TIC Electrical Ltd | Construction | 2019 |
| Tickle & Whybrow Ltd | Households | 2022 |
| Tide Services Limited | Professional & scientific | 2018 |
| Tiger Kitchens Limited | Wholesale & retail | 2014 |
| Tile Merchants Distribution Limited | Financial services | 2016 |
| Tile Merchants Limited | Wholesale & retail | 2005 |
| Tileweb Limited | Wholesale & retail | 2015 |
| Tillson Auto Services Ltd | Wholesale & retail | 2022 |
| TIM Bryson Consultancy Services Ltd. | Professional & scientific | 2012 |
| TIM Ireland Construction Limited | Construction | 2018 |
| Timber Press, Inc. | | 1993 |
| Timbro Holdings Ltd | Manufacturing | 2022 |
| Timely Recruitment Ltd | Administrative & support | 2018 |
| Timespace Technology Ltd. | Manufacturing | 1997 |
| Timios Waste Services Ltd | Water & waste | 2020 |
| Timothy Stone Finance Limited | Professional & scientific | 2018 |
| Timtrans. Limited | Transport & logistics | 2024 |
| Tineg Limited | Health & social care | 2023 |
| Tirnoa Ltd | Information & communication | 2024 |
| Titan Boat Canopies Limited | Manufacturing | 2010 |
| Tizana Limited | Hospitality | 2025 |
| TK Swan Ltd | Real estate | 2025 |
| TK Transport Solutions Ltd | Transport & logistics | 2021 |
| TMA Trans Ltd | Transport & logistics | 2022 |
| TMT Seafood Ltd | Hospitality | 2021 |
| Tobi Services Ltd | Health & social care | 2015 |
| Today I Ltd | Professional & scientific | 2022 |
| Together WE Lift CIC | Other services | 2025 |
| Toit Fishing Ltd | Wholesale & retail | 2021 |
| Tokyo Glitch Co. Ltd | Wholesale & retail | 2026 |
| Toltas Logistics Ltd | Wholesale & retail | 2024 |
| TOM Allerton Consulting Ltd | Professional & scientific | 2024 |
| Tom's Cakes (ELY) Ltd | Manufacturing | 2019 |
| Tom's Cakes Limited | Manufacturing | 2005 |
| Tonerate Limited | Wholesale & retail | 2023 |
| Toni Hunter Limited | Professional & scientific | 2012 |
| Tonksyart Ltd | Arts & recreation | 2023 |
| TOO & Associates Ltd | Hospitality | 2024 |
| TOO Fast Media Group Ltd | Administrative & support | 2015 |
| Toolriffic Limited | Wholesale & retail | 2019 |
| Top Field Farms Limited | Agriculture & fishing | 2007 |
| Top HEX Limited | Manufacturing | 2002 |
| Top Supplement Limited | Wholesale & retail | 2015 |
| Toplast Auto Solutions Ltd | Wholesale & retail | 2024 |
| TOSHY2018 Ltd | Transport & logistics | 2018 |
| Total Pallets Limited | Wholesale & retail | 2025 |
| Total Property Investors Ltd | Real estate | 2018 |
| Total Skin Health Ltd | Other services | 2023 |
| Totally Virtual Limited | Professional & scientific | 2006 |
| Tough Tyres Ltd | Wholesale & retail | 2024 |
| Tower Farms Barns Holme Limited | Agriculture & fishing | 2020 |
| Towpath Digital Ltd | Information & communication | 2025 |
| Toy Brokers Holdings Limited | Manufacturing | 2009 |
| Toy Brokers Limited | Wholesale & retail | 1996 |
| Toyer Consulting Ltd | Professional & scientific | 2023 |
| TP Protection Ltd | Administrative & support | 2025 |
| TPG Consults Ltd | Information & communication | 2023 |