| THE Juicy Marketer Limited | Professional & scientific | 2025 |
| THE King's School, ELY | Education | 1989 |
| THE Light Blue Group Ltd | Professional & scientific | 2022 |
| THE Little Mobile Bar Company Limited | Wholesale & retail | 2020 |
| THE Malabarikh Atelier Ltd. | Hospitality | 2024 |
| THE Masked Repairer Ltd | Wholesale & retail | 2025 |
| THE Micron Group Limited | Professional & scientific | 2001 |
| THE Modified Side Ltd | Wholesale & retail | 2025 |
| THE Ness Club Limited | Arts & recreation | 2023 |
| THE New Indian Garden (Littleport) Ltd | Hospitality | 2024 |
| THE Old Dispensary ELY Limited | Real estate | 2024 |
| THE Old Flour Mills Limited | Households | 2004 |
| THE Old Hall ELY Limited | Hospitality | 2015 |
| THE Old Warehouse ELY Limited | Hospitality | 2023 |
| THE Orchards (Paddock Wood) Limited | Households | 2022 |
| THE Original Wall of Death Ltd | Arts & recreation | 2009 |
| THE Pits Management Company Limited | Households | 2019 |
| THE Pole Shed Ltd | Arts & recreation | 2022 |
| THE Poor's Houses (Woodbridge) | Health & social care | 2023 |
| THE Potato Link Limited | Agriculture & fishing | 2015 |
| THE Rewarding Results Company Ltd | Education | 2012 |
| THE Rock Solid Community Hub C.I.C. | Health & social care | 2023 |
| THE Rock Solid Community Limited | Health & social care | 2021 |
| THE Schoolhouse Management Company (Calverley Street) Limited | Real estate | 2004 |
| THE Soothing Company Limited | Other services | 2007 |
| THE Stable Coffee Limited | Hospitality | 2019 |
| THE Stock Shop Limited | Wholesale & retail | 1992 |
| THE Sycamores Haddenham Management Company Limited | Households | 2004 |
| THE Undercover Workshop Ltd | Manufacturing | 2021 |
| THE White Pheasant Limited | Hospitality | 2015 |
| THE Wilburton Residents' Management Company Limited | Households | 2022 |
| THE Woodmakers (Littleport) Limited | Wholesale & retail | 2016 |
| Theatre KID Live Ltd | Arts & recreation | 2023 |
| Thefunctionalphysio Ltd | Health & social care | 2026 |
| Theoquest Ltd | Professional & scientific | 2025 |
| Thermokil Limited | Professional & scientific | 2001 |
| Thod's Bazaar Limited | Wholesale & retail | 2011 |
| Thomas Mews Management Ltd | Households | 2012 |
| Thomas SK Law Limited | Construction | 2022 |
| Thorlabs Limited | Manufacturing | 2004 |
| Thoroughbred Developments Limited | Real estate | 2006 |
| Thorwood (Construction) Limited | Construction | 2016 |
| Three Blind Mice Brewery Ltd | Manufacturing | 2013 |
| Three DEE Cards Ltd | Wholesale & retail | 2024 |
| Thriving Edge Limited | Professional & scientific | 2023 |
| Through Faith Missions | Other services | 1989 |
| Thurlow Nunn (Motor Vehicles) Limited | Extraterritorial | 2004 |
| Thurlow Nunn (MV) Limited | Extraterritorial | 2014 |
| Tiec Group Ltd | Other services | 2018 |
| Tillship Chartering Ltd | Transport & logistics | 2019 |
| TIM Howard Engineering Ltd | Manufacturing | 2000 |
| Timber Wood and Construction Ltd | Wholesale & retail | 2025 |
| Timelord Watch Repairs Limited | Other services | 2023 |
| Times Performance Limited | Wholesale & retail | 2026 |
| Timestack Ltd | Information & communication | 2025 |
| TIN Shed Mushrooms Ltd | Agriculture & fishing | 2026 |
| Tina Barsby Limited | Professional & scientific | 2021 |
| Tiny Revolutions Group Ltd | Education | 2025 |
| TIP Photography Limited | Professional & scientific | 2014 |
| Tiptree Marina Limited | Other services | 2025 |
| Titanium Racket Sports Limited | Financial services | 2025 |
| Tixevery Ltd | Information & communication | 2026 |
| TK Capital Ltd | Financial services | 2025 |
| TK Property Solutions Limited | Real estate | 2020 |
| TK Total Fitness Limited | Arts & recreation | 2014 |
| TLC Groundwork & Construction Ltd | Construction | 2011 |
| Tlepsh Ltd | Professional & scientific | 2021 |
| Tmeecs Ltd | Construction | 2018 |
| TNP Guild Limited | Wholesale & retail | 2013 |
| Today Management Ltd | Professional & scientific | 2006 |
| Together Culture CIC | Education | 2021 |
| TOM Parish Plumbing and Heating Supplies Ltd | Construction | 2017 |
| Tomorrow Homes Ltd | Construction | 2021 |
| Tompsett Growers Limited | Agriculture & fishing | 2000 |
| Tompsett Holdings Limited | Agriculture & fishing | 2002 |
| Top Farms International Holdings Limited | Financial services | 2015 |
| Top Farms International Limited | Financial services | 1972 |
| Top Property Holdings Limited | Financial services | 2026 |
| Top Store Grocery Ltd | Wholesale & retail | 2025 |
| Topcat Metrology Limited | Professional & scientific | 2008 |
| Toppers Hair Designs Limited | Other services | 2011 |
| Topping & Company Booksellers Limited | Wholesale & retail | 2002 |
| Topping Test Services Limited | Professional & scientific | 2010 |
| Total Care Advisory Limited | Professional & scientific | 2024 |
| Total Data Quality Limited | Information & communication | 2013 |
| Total Hoist Solutions Ltd | Administrative & support | 2017 |
| TOTS2TEENS Allergies Limited | Education | 2025 |
| Touch My World CIC | Other services | 2024 |
| Tower Commercials Ltd | Wholesale & retail | 2025 |
| Townsend Mews Management Ltd | Households | 2020 |
| Townsend Paddock Limited | Real estate | 2005 |
| Townsend Solutions Ltd | Construction | 2012 |
| Toxik Software Ltd | Information & communication | 2026 |
| Toytopiauk Ltd | Wholesale & retail | 2025 |
| Tozer Seeds Holdings Limited | Financial services | 2024 |
| Tozer Seeds Limited | Other services | 1998 |
| TP Services & Traffic Solutions Ltd | Construction | 2019 |
| Tradedesign Integration Ltd | Professional & scientific | 2013 |
| Traditional Ferris Wheel Company Ltd | Arts & recreation | 2023 |
| Trai Property Services Ltd | Real estate | 2020 |