| T&T Embroidery Solutions Limited | Manufacturing | 2009 |
| T.W.H.Clarke and SON(1954)LIMITED | Agriculture & fishing | 1954 |
| T2C Limited | Professional & scientific | 2024 |
| TA International Limited | Wholesale & retail | 2002 |
| TAB Architecture Limited | Professional & scientific | 2016 |
| Tabletop Quests Ltd | Arts & recreation | 2025 |
| Talos Tech Services Ltd | Wholesale & retail | 2021 |
| Tamrec Limited | Wholesale & retail | 2018 |
| Tamzie Ltd | Health & social care | 2023 |
| Tang Inclusion Ltd | Information & communication | 2019 |
| Target 51 Limited | Education | 2015 |
| Target Broadcast Systems Ltd | Information & communication | 2012 |
| Target Print Limited | Manufacturing | 2003 |
| Tate Holdings Group Ltd | Financial services | 2021 |
| Tax Research LLP | | 2005 |
| Taxattack Ltd | Professional & scientific | 2008 |
| Taylor Farms Industries Ltd | Agriculture & fishing | 2012 |
| Taylor Livestock Limited | Agriculture & fishing | 2020 |
| Taylor Potatoes Limited | Transport & logistics | 2016 |
| Taylor's Fenland Potatoes Limited | Wholesale & retail | 1976 |
| Taylor-Shaw Properties Limited | Construction | 2003 |
| Taylors of Soham Limited | | 1980 |
| Taywell Properties Limited | Real estate | 2025 |
| TB Construction (East Anglia) Limited | Construction | 2014 |
| TB Construction Investments Ltd | Real estate | 2019 |
| TD Carpentry Ltd | Manufacturing | 2018 |
| TE 566 Limited | Transport & logistics | 2020 |
| Techminds Advisory Ltd | Professional & scientific | 2025 |
| Techneat Engineering Limited | Manufacturing | 1984 |
| Techneat Holdings Limited | Construction | 2017 |
| Techniche Sales Ltd | Wholesale & retail | 2024 |
| Techtoniq Limited | Information & communication | 2008 |
| Teeny Tiny Chef Limited | Manufacturing | 2013 |
| Tela Collections Limited | Wholesale & retail | 2005 |
| Tele M4U Limited | Other services | 2004 |
| Telecom Risk Consulting Limited | Information & communication | 2006 |
| Temper Theatre Ltd | Arts & recreation | 2022 |
| Terence Place (Fordham) Management Company Limited | Real estate | 2023 |
| Termofol Limited | Other services | 2020 |
| TERRA8 Limited | Real estate | 2023 |
| Terravost Group Limited | Professional & scientific | 2021 |
| Terravost Limited | Professional & scientific | 2010 |
| Terry Cooper Group Ltd | Administrative & support | 2015 |
| Test & Research Centre Holdings Ltd | Financial services | 2018 |
| Test & Research Centre Ltd | Professional & scientific | 2018 |
| Test & Research Group Ltd | Financial services | 2024 |
| Teviot Labs Limited | Information & communication | 2026 |
| TFP Ventures Limited | Agriculture & fishing | 2014 |
| TGB Restaurants Ltd | Hospitality | 2023 |
| Tgowing Group Limited | Financial services | 2025 |
| TH60 Limited | Hospitality | 2025 |
| Thackray UK Limited | Construction | 2014 |
| Thai Plough Ltd | Hospitality | 2025 |
| Thalassic Engineering Limited | Professional & scientific | 2019 |
| Thalasso Dream Ltd | Real estate | 2025 |
| Tharp Arms (2018) Limited | Hospitality | 2018 |
| Thatch & Roses Ltd | Wholesale & retail | 2023 |
| Thatchers Wood Residents Company Limited | Real estate | 2000 |
| THE Angel Brewery Company Limited | Manufacturing | 2007 |
| THE Apollonian EYE Ltd | Information & communication | 2025 |
| THE ARK Isleham | Other services | 2007 |
| THE Balloon Emporium Ltd | Other services | 2016 |
| THE Barkery of Littleport Ltd | Wholesale & retail | 2026 |
| THE Beauty Loft ELY Ltd | Other services | 2016 |
| THE Boat Haven Limited | Real estate | 2020 |
| THE Bookkeeping Company (ELY) Limited | Professional & scientific | 2011 |
| THE Brambles (Soham) Limited | Health & social care | 2011 |
| THE Brew Project Cafe Limited | Hospitality | 2023 |
| THE British Hanoverian Horse Society | Other services | 1999 |
| THE Cambridge Joiner Ltd | Manufacturing | 2018 |
| THE Cambridge Pringle Group | Health & social care | 1993 |
| THE Cambridge Property Practice Ltd | Real estate | 2002 |
| THE Cambridge Swimming Company Ltd | Wholesale & retail | 2021 |
| THE Classic Barge Company Limited | Manufacturing | 2004 |
| THE Cookware Company UK & Ireland Limited | Wholesale & retail | 2009 |
| THE Copier Warehouse Limited | Wholesale & retail | 1994 |
| THE Diocese of ELY Educational Trust | Education | 2013 |
| THE Dock Service Company Limited | Administrative & support | 1996 |
| THE Dog House Solution Ltd | Professional & scientific | 2012 |
| THE Dog Lounge Limited | Other services | 2026 |
| THE Drnk Group Ltd | Wholesale & retail | 2020 |
| THE Earthlings Retreat Ltd | Education | 2025 |
| THE East Anglian Heights Trading Company Limited | Real estate | 2011 |
| THE ELY Planning Company Ltd | Professional & scientific | 2009 |
| THE Farm Shop (ELY) Ltd | Wholesale & retail | 2024 |
| THE FEN Pack Ltd | Arts & recreation | 2026 |
| THE Finsbury Plan Limited | Financial services | 2018 |
| THE Forge . Soham CIC | Hospitality | 2026 |
| THE Giving Ticket Ltd | Arts & recreation | 2025 |
| THE Golf DEN Ltd | Administrative & support | 2023 |
| THE Green (Little Thetford) Management Company Limited | Households | 2020 |
| THE Green Kitchen Limited | Wholesale & retail | 2023 |
| THE Guest House (ELY) Ltd | Hospitality | 2017 |
| THE Hoist Management Company Limited | Administrative & support | 2010 |
| THE Home 2008 Limited | Real estate | 2008 |
| THE Home Loan Lady Ltd | Financial services | 2026 |
| THE Homemakery Limited | Wholesale & retail | 2013 |
| THE Houseplant People Ltd | Wholesale & retail | 2020 |
| THE Impossible IS Possible Ltd | Professional & scientific | 2020 |
| THE Investable Group Ltd. | Professional & scientific | 2020 |