| Suriyan Limited | Real estate | 2020 |
| Suzanne Pool Services Limited | Professional & scientific | 2016 |
| Svenwerk Ltd | Manufacturing | 2012 |
| SW Cleaning Ltd | Administrative & support | 2022 |
| Swan Astro Limited | Arts & recreation | 1994 |
| Sweatroom Beauty Limited | Other services | 2016 |
| Swim With B Ltd | Education | 2024 |
| Symmetry Construction Limited | Construction | 2014 |
| Sympatico Joinery Ltd | Manufacturing | 2013 |
| Symphony Audio Ltd | Wholesale & retail | 2013 |
| Syncity AI Ltd | Information & communication | 2025 |
| Syncity Ltd | Information & communication | 2019 |
| Synergista Project Services Limited | Information & communication | 2011 |
| Sytechs IT Limited | Information & communication | 2020 |
| T & J Tyres Limited | Wholesale & retail | 2024 |
| T H Kenyon Holdings Limited | Real estate | 1996 |
| T J Autocentre Ltd | Wholesale & retail | 2024 |
| T&S Shop Fitting Ltd | Construction | 2021 |
| T. Reed & SON Ltd | Wholesale & retail | 2008 |
| T17 Ltd | Arts & recreation | 2022 |
| Tacoman Limited | Hospitality | 2022 |
| TAG Performance Ltd | Health & social care | 2014 |
| TAK Consulting Ltd | Professional & scientific | 2025 |
| Talcy Ltd | Professional & scientific | 2026 |
| Talents Home & Gift Limited | Wholesale & retail | 2026 |
| Talk UK Telecom Limited | Wholesale & retail | 2009 |
| Talks Media Group Limited | Administrative & support | 2021 |
| Talons Falconry Limited | Arts & recreation | 2026 |
| Tamarisk Events Limited | Administrative & support | 2023 |
| Tandem Vehicle Solutions Ltd | Financial services | 2026 |
| Tang & Co Home Limited | Administrative & support | 2018 |
| Tang & Yeung Co Ltd | Manufacturing | 2026 |
| Tangerine Telecom Limited | Information & communication | 2018 |
| Tank Handmade Limited | Manufacturing | 2013 |
| Tankwatch Limited | Professional & scientific | 2012 |
| Targit Communications Limited | Professional & scientific | 2016 |
| TAU Property Venture Ltd | Real estate | 2025 |
| Tavener Building & Landscapes Ltd | Construction | 2025 |
| Tayler Bradshaw FEE Warranty Services Limited | Financial services | 2000 |
| Tayler Bradshaw Limited | Professional & scientific | 2000 |
| Taylor Westbrook Ltd | Manufacturing | 2024 |
| Taylormade Signs Limited | Arts & recreation | 2022 |
| TCS Computing Limited | Information & communication | 1990 |
| Tea Engineering Ltd. | Information & communication | 2017 |
| TECH4TECH Limited | Information & communication | 2016 |
| Temple of Sound Ltd | Wholesale & retail | 2024 |
| Tenancy Transition Solutions Ltd. | Real estate | 2015 |
| Tendring Physical Testing Limited | Wholesale & retail | 2018 |
| Tenison Lodge Ltd | Real estate | 2025 |
| Terminal Precision Ltd | Manufacturing | 2026 |
| Terra Motion Holdings Limited | Professional & scientific | 2019 |
| Terra Motion UK Limited | Professional & scientific | 2025 |
| Terranova Environmental Group Limited | Water & waste | 2025 |
| Tesscon Ltd | Financial services | 2024 |
| Tethys Aquaculture Limited | Agriculture & fishing | 2011 |
| Tetris Pharma Ltd | Wholesale & retail | 2020 |
| Text Into English Ltd | Professional & scientific | 2021 |
| Tgan Ltd | Construction | 2023 |
| TGM Advisory Services Limited | Professional & scientific | 2024 |
| Thacker Partnerships Limited | Professional & scientific | 2023 |
| Thaxted Builders Limited | Construction | 1965 |
| Thaxted Investments Limited | Hospitality | 2004 |
| THE Activity Superstore Limited | Wholesale & retail | 1997 |
| THE Apprenticeship Candidate Limited | Information & communication | 2026 |
| THE Audley Inn Limited | Hospitality | 2014 |
| THE Bawdsey Project Ltd | Professional & scientific | 1992 |
| THE Bedside Curator Limited | Wholesale & retail | 2026 |
| THE Bonhunt Press Ltd | Information & communication | 2016 |
| THE Bowood Rooms Ltd | Health & social care | 2020 |
| THE Byte Group Limited | Information & communication | 2017 |
| THE Cambridge Gift Shop Limited | Administrative & support | 2009 |
| THE Clavering Gym Limited | Arts & recreation | 2015 |
| THE Clean Food Co Ltd | Manufacturing | 2023 |
| THE Code GUY Limited | Information & communication | 2015 |
| THE Code Zone Ltd | Information & communication | 2019 |
| THE Code Zone North Essex Ltd | Information & communication | 2022 |
| THE Coir POT Company Ltd | Wholesale & retail | 2020 |
| THE Condensation Shop Limited | Manufacturing | 1993 |
| THE Council for Voluntary Service Uttlesford | Other services | 2003 |
| THE Cricket Draft Ltd | Information & communication | 2021 |
| THE CS Edit Ltd | Extraterritorial | 2025 |
| THE Culley Property Collective Ltd | Real estate | 2025 |
| THE Curious Group Ltd | Professional & scientific | 2017 |
| THE Dark Stars (Warwick) Limited | Real estate | 2017 |
| THE Dharma Trust | Hospitality | 2001 |
| THE Every Child Swims Foundation CIC | Arts & recreation | 2025 |
| THE Executive Support Agency Ltd | Administrative & support | 2023 |
| THE Fairycroft House Community Interest Company | Other services | 2014 |
| THE Followship Ltd | Professional & scientific | 2022 |
| THE Font Climbing Ltd | Arts & recreation | 2019 |
| THE Fred Production Company Limited | Information & communication | 2005 |
| THE Full Stop Community CIC | Other services | 2023 |
| THE Gaffer Group Limited | Professional & scientific | 2019 |
| THE Game Zone Cambridge Ltd | Information & communication | 2024 |
| THE Garden Guru and Associates Limited | Professional & scientific | 2005 |
| THE Granaries Mgmnt Company Limited | Real estate | 2022 |
| THE Green Garages (Newport) Limited | Wholesale & retail | 2021 |
| THE Green House Group Ltd | Administrative & support | 2019 |
| THE Halkin Partnership Limited | Administrative & support | 2008 |
| THE Holding Zone Ltd | Financial services | 2024 |