| THE Gilded Manor Ltd | Other services | 2024 |
| THE Goodkind Agency Limited | Professional & scientific | 1998 |
| THE Greek Orthodox Community the Twelve Apostles Hertfordshire Trust | Other services | 2004 |
| THE Hawthorns (Hatfield) Management Company Limited | Households | 2017 |
| THE Hideout Collective B'N'B CIC | Hospitality | 2025 |
| THE Home PA Company Limited | Administrative & support | 2023 |
| THE Icon Freehold Company Limited | Real estate | 2008 |
| THE Jodhpur Company London Limited | Wholesale & retail | 2014 |
| THE Junction Consulting Ltd | Professional & scientific | 2018 |
| THE Krave Peri Peri Limited | Hospitality | 2023 |
| THE Life Office Ltd | Administrative & support | 2026 |
| THE Line Tech Solutions Limited | Information & communication | 2022 |
| THE Liquor Booze Barn Ltd | Wholesale & retail | 2022 |
| THE London Allergy Clinic Limited | Health & social care | 2016 |
| THE London Knee Doctor Limited | Health & social care | 2019 |
| THE Lovely Little Ltd | Real estate | 2015 |
| THE Machrie Links Hotel Co Ltd | Real estate | 1995 |
| THE Marble Group Developments Ltd. | Extraterritorial | 2011 |
| THE Marble Group Limited | Manufacturing | 2007 |
| THE Medical Recruitment Network Ltd | Administrative & support | 2020 |
| THE Mind Body & Soul Collective CIC | Professional & scientific | 2025 |
| THE Oak House Studio & Therapies Ltd | Professional & scientific | 2020 |
| THE Old Fire Station Management Company Limited | Households | 2002 |
| THE ONE10 Collective Ltd | Professional & scientific | 2025 |
| THE Paint Patch Ltd | Arts & recreation | 2026 |
| THE Paragon Media Company Limited | Information & communication | 1995 |
| THE Penn Medical and Wellness Group Ltd | Health & social care | 2025 |
| THE Pgroup Estates Ltd | Real estate | 2022 |
| THE Phenom Brand Ltd | Information & communication | 2023 |
| THE Portfolio Platform Group Ltd | Construction | 2025 |
| THE Post Room London Ltd | Professional & scientific | 2010 |
| THE Potterells Management Company Limited | Households | 1998 |
| THE Powerhouse Practitioner Ltd | Administrative & support | 2025 |
| THE Pumphouse Residents Company Limited | Households | 2005 |
| THE Real Gran Turismo Ltd | Arts & recreation | 2009 |
| THE Rise Hatfield Limited | Other services | 2023 |
| THE Scaffolding Company Limited | Construction | 1990 |
| THE Shade House Ltd | Wholesale & retail | 2026 |
| THE Shisha MAN Ltd | Hospitality | 2024 |
| THE Sober Sailor Alcohol Free Bar Ltd | Hospitality | 2022 |
| THE Stephenson Consultancy Limited | Professional & scientific | 2022 |
| THE Stephenson Group Partnership Limited | Professional & scientific | 2022 |
| THE Stickleback Fish Company Limited | Manufacturing | 2005 |
| THE Studio Hatfield Ltd | Hospitality | 2021 |
| THE Surface Decor Co Limited | Construction | 2019 |
| THE Surface Decor Franchise Limited | Administrative & support | 2024 |
| THE Systems Innovation and Research International Limited | Information & communication | 2022 |
| THE Technical Trainer Ltd | Arts & recreation | 2021 |
| THE Travel Director Ltd | Administrative & support | 2014 |
| THE Travel Princess Ltd | Administrative & support | 2015 |
| THE True Economist Ltd | Professional & scientific | 2015 |
| THE Vickers (Witchford) Residents Management Company Limited | Households | 2020 |
| THE Visirian Restaurants PVT Ltd | Hospitality | 2025 |
| THE Willows Residential Management Company Limited | Households | 2023 |
| THE Written Reverie Limited | Wholesale & retail | 2026 |
| Thecleanmate Limited | Administrative & support | 2025 |
| Thecrafter Ltd | Manufacturing | 2020 |
| Thema Solutions Ltd | Information & communication | 2023 |
| Themontpelican Ltd | Administrative & support | 2023 |
| Thesemantics Ltd | Wholesale & retail | 2026 |
| Think Forward Group Limited | Information & communication | 2019 |
| Thirteen S&D Limited | Professional & scientific | 2017 |
| Thiru Properties Limited | Real estate | 2025 |
| This IS Myme Limited | Information & communication | 2013 |
| This IS the Life Travel Limited | Administrative & support | 2014 |
| Thomas and Spiers Ltd | Professional & scientific | 2010 |
| Thomas Crown Property Investments Ltd | Real estate | 2025 |
| Thoranmart Limited | Wholesale & retail | 1986 |
| Thornton Capital Limited | Financial services | 2025 |
| Three & Co Estates Limited | Households | 2026 |
| Three Corner Field Development Limited | Construction | 2016 |
| Three Counties Spirits Co Limited | Manufacturing | 2023 |
| Three Health and Wellness Limited | Wholesale & retail | 2025 |
| Three Valleys Water Limited | Extraterritorial | 1993 |
| Tiberone Technologies Limited | Information & communication | 2000 |
| Tickeleye Limited | Wholesale & retail | 2024 |
| Tiling and Masonry Ltd | Construction | 2007 |
| Timeless Creative Studio Limited | Professional & scientific | 2025 |
| Timelogic Ltd | Professional & scientific | 2025 |
| Titan Drivers Ltd | Other services | 2019 |
| Titronics Ltd. | Wholesale & retail | 2025 |
| TJ Tree Ltd | Administrative & support | 2018 |
| TJB Consultants Limited | Professional & scientific | 2009 |
| TJS Accountancy Services Ltd | Professional & scientific | 2009 |
| TJT Consulting Limited | Administrative & support | 2023 |
| TKA Consulting Limited | Professional & scientific | 2013 |
| Tksg Trading Limited | Wholesale & retail | 2025 |
| TM Maintenance Limited | Administrative & support | 2017 |
| Tmcf Ltd | Professional & scientific | 2012 |
| TMJ Electrical Ltd | Construction | 2022 |
| TMZ Post Limited | Wholesale & retail | 2015 |
| Tn&Youhair Ltd | Other services | 2024 |
| Toba Consultants Limited | Professional & scientific | 2026 |
| Toba Group Limited | Financial services | 2026 |
| Today's the Day Limited | Administrative & support | 2007 |
| Tojira Ltd | Professional & scientific | 2026 |
| TOK Clean Ltd | Administrative & support | 2024 |
| Tokpopmart Limited | Wholesale & retail | 2025 |
| Tomescu 76 Limited | Transport & logistics | 2015 |
| Tomiemak Ltd | Health & social care | 2014 |