| Terriman Holdings Ltd | Financial services | 2016 |
| Terriman Limited | Construction | 2003 |
| Terry Bulley Property Services Ltd | Real estate | 2025 |
| Terry Grant Properties Limited | Real estate | 2017 |
| Terry Grant Stunts Limited | Arts & recreation | 2017 |
| Testguard Limited | Information & communication | 2024 |
| Testplay Limited | Professional & scientific | 1997 |
| Tevcc Limited | Construction | 2019 |
| TEX Media PT Limited | Administrative & support | 2010 |
| Tezz Electrical Limited | Construction | 2025 |
| Tforce Fabrication Ltd | Construction | 2022 |
| Tfward Construction Ltd | Construction | 2024 |
| TGI Taverns Limited | Construction | 2009 |
| Tgpp Autocare Ltd | Wholesale & retail | 2024 |
| Thaddeus Productions Limited | Arts & recreation | 2019 |
| Thames Coldstore Installation Limited | Construction | 2003 |
| Thames Coldstore Insulation Limited | Construction | 1994 |
| Thames Heliport Limited | Extraterritorial | 2015 |
| Thatahmedkhan Limited | Information & communication | 2025 |
| Thatcher Services Ltd | Transport & logistics | 2021 |
| THE 23 Group Limited | Real estate | 2021 |
| THE Abilities in ME CIC | Education | 2026 |
| THE Afro Traveller Ltd | Information & communication | 2019 |
| THE Airmen Group Limited | Financial services | 2024 |
| THE Amazing Devil Limited | Arts & recreation | 2023 |
| THE Anthems Agency Ltd | Arts & recreation | 2018 |
| THE Ashby PUB Ltd | Hospitality | 2026 |
| THE Aston Alpacas Ltd | Education | 2025 |
| THE Audience Magnet Limited | Arts & recreation | 2015 |
| THE Balloon Wall Ltd | Wholesale & retail | 2018 |
| THE Beaute Experience Ltd | Health & social care | 2025 |
| THE Beehive Public House Ltd | Hospitality | 2009 |
| THE Big Fisch Company Limited | Manufacturing | 2005 |
| THE Big Kick Company Limited | Administrative & support | 1999 |
| THE Big Kick Group Limited | Professional & scientific | 2009 |
| THE Big Vending Company Limited | Hospitality | 2012 |
| THE Bottle and Board Stevenage Limited | Hospitality | 2024 |
| THE Brewing CUP Limited | Hospitality | 2018 |
| THE Brook Support Services Ltd | Health & social care | 2022 |
| THE Card Show UK Ltd | Wholesale & retail | 2025 |
| THE Chapel Stockbrokers Limited | Financial services | 2024 |
| THE Chequers Alehouse Ltd | Hospitality | 2026 |
| THE Claxton Trust | Education | 2016 |
| THE Clean TEAM915 Ltd | Administrative & support | 2024 |
| THE Coach House Management Co (Chapmore END) Limited | Households | 2022 |
| THE Coaching Corner Ltd | Education | 2021 |
| THE Courtyard (Bishop's Stortford) Management Company Limited | Real estate | 2008 |
| THE Cozy Corner I Ltd | Hospitality | 2025 |
| THE Curators! Ltd | Information & communication | 2021 |
| THE Cutter Barbershop Ltd | Other services | 2014 |
| THE Definitive Laser Company Limited | Professional & scientific | 1997 |
| THE Devel Box Ltd | Information & communication | 2019 |
| THE Devision Business Performance Management Limited | Administrative & support | 2018 |
| THE East London Care Group Limited | Health & social care | 2018 |
| THE Ehco Limited | Hospitality | 2014 |
| THE Employability Partnership Limited | Administrative & support | 2012 |
| THE Engine Room Films Limited | Information & communication | 2020 |
| THE Fernley Foundation CIC | Education | 2021 |
| THE Fiduciary Limited | Professional & scientific | 2005 |
| THE Five Percent Group Ltd | Arts & recreation | 2024 |
| THE Flowerpot Stevenage Ltd | Wholesale & retail | 2021 |
| THE Follett Office Limited | Administrative & support | 2011 |
| THE Food Ingredients Group Limited | Professional & scientific | 2003 |
| THE for Baby's Sake Trust | Other services | 2008 |
| THE Forum (Stevenage) Limited | Real estate | 2013 |
| THE Fourway Group Limited | Professional & scientific | 1997 |
| THE Frogmore Group Ltd | Financial services | 2026 |
| THE GHK Company Corporation Ltd | Wholesale & retail | 2026 |
| THE GK Group Limited | Administrative & support | 2020 |
| THE Good Housekeeping Agency Limited | Other services | 2009 |
| THE Goodfather Ltd | Information & communication | 2020 |
| THE Graffiti Removal Company (Southern) Ltd | Administrative & support | 2025 |
| THE Grange (Old Stevenage) Management Company Limited | Households | 1999 |
| THE Grange Stevenage (Freehold) Ltd | Real estate | 2010 |
| THE Graphics Guys Ltd | Other services | 2024 |
| THE Grist Wood Ltd | Professional & scientific | 2025 |
| THE Hang OUT - Activities and Events Ltd | Health & social care | 2016 |
| THE Happy DOC Company Ltd | Health & social care | 2014 |
| THE Hart Schools Trust Ltd | Education | 2011 |
| THE Hertfordshire Card Show Limited | Wholesale & retail | 2024 |
| THE Hertfordshire Roofing Co. Ltd | Construction | 2017 |
| THE Highbrow Collective Limited | Other services | 2022 |
| THE Highbrow Hitchin Limited | Other services | 2022 |
| THE Hormone Clinic & Psychiatry Co Ltd | Health & social care | 2022 |
| THE Horsebox UK Limited | Hospitality | 2015 |
| THE House of Belgravia Ltd | Other services | 2012 |
| THE Human Codex Limited | Administrative & support | 2017 |
| THE Hyde Newsagents Shop Limited | Wholesale & retail | 2019 |
| THE I'M Fine Line Ltd. | Professional & scientific | 2025 |
| THE Inclusion Project Franchising Ltd | Health & social care | 2017 |
| THE Inclusion Project ST Albans Limited | Health & social care | 2019 |
| THE Internet Traveller Limited | Administrative & support | 2025 |
| THE IT People (Home) Limited | Other services | 2011 |
| THE IT People (Notts) Limited | Information & communication | 2016 |
| THE IT People Group Ltd | Other services | 2023 |
| THE IVY Florist Ltd | Wholesale & retail | 2014 |
| THE Jupiter Singers Amersham Limited | Arts & recreation | 2023 |
| THE Jupiter Singers Frinton-On-Sea Limited | Arts & recreation | 2023 |
| THE Jupiter Singers Hemel Hempstead Limited | Arts & recreation | 2023 |
| THE Jupiter Singers Letchworth Limited | Arts & recreation | 2023 |