| THE Outdoor Kitchen Collective Ltd | Manufacturing | 2024 |
| THE Overdraught Ltd | Hospitality | 2020 |
| THE Paddocks at Balby Property Management Limited | Households | 2004 |
| THE Paintstripping Ltd | Other services | 2024 |
| THE Patients Guide Ltd | Wholesale & retail | 2022 |
| THE PAY Index Limited | Information & communication | 2019 |
| THE People Equation UK Limited | Professional & scientific | 2008 |
| THE Perfect POP Co-Op Limited | Arts & recreation | 2015 |
| THE Performers Accountant Ltd | Professional & scientific | 2014 |
| THE Pet POO People Limited | Water & waste | 2020 |
| THE Pharmacy (Bricket Wood) Limited | Professional & scientific | 1997 |
| THE Physio & Wellness Clinic Limited | Other services | 2022 |
| THE Piano Movers Limited | Transport & logistics | 2011 |
| THE Pilates Barns Limited | Arts & recreation | 2025 |
| THE Piper Portfolio Limited | Real estate | 2021 |
| THE Plough ST Albans Limited | Hospitality | 2024 |
| THE Positive English Language School Ltd | Education | 2017 |
| THE Positive Planner Limited | Wholesale & retail | 2017 |
| THE Premium Property Place Ltd | Real estate | 2020 |
| THE Progressive Pilates Studio Limited | Arts & recreation | 2024 |
| THE Public Arts Trust, Milton Keynes Limited | Other services | 2011 |
| THE Puppet Company Limited | Wholesale & retail | 2002 |
| THE PUT Supper Club 1 Ltd | Hospitality | 2021 |
| THE Ramparts Management (1981) Limited | Extraterritorial | 1981 |
| THE Red Lion Developers Limited | Construction | 2006 |
| THE Redbourn Removal Company Ltd | Transport & logistics | 2021 |
| THE Riverside House Hotel Limited | Hospitality | 2010 |
| THE Rock Church UK Ltd | Other services | 2021 |
| THE Rose Thistle Ltd | Other services | 2025 |
| THE Schoolwear Shop Ltd | Wholesale & retail | 2004 |
| THE Scribe and Illustrations Company Ltd | Arts & recreation | 2013 |
| THE Second Loop Ltd | Professional & scientific | 2026 |
| THE Shed Interior Design Ltd | Professional & scientific | 2026 |
| THE Shop on the Hill Ltd | Wholesale & retail | 2013 |
| THE Short Story Official Ltd | Information & communication | 2024 |
| THE Shower Room Ltd. | Construction | 2013 |
| THE Shrubberies RTM Company Ltd | Households | 2010 |
| THE SIM Guys Limited | Information & communication | 2012 |
| THE Small Solar Company Ltd | Construction | 2009 |
| THE Spice Tailor Limited | Hospitality | 2010 |
| THE Sports Coaching Academy Ltd | Arts & recreation | 2020 |
| THE Spotted Ltd | Hospitality | 2024 |
| THE ST. Albans Meter Company Limited | Manufacturing | 1985 |
| THE Steps Initiative CIC | Education | 2026 |
| THE Street Cafe ( ST Albans) Ltd. | Hospitality | 2016 |
| THE Studio Bedford Ltd | Wholesale & retail | 2022 |
| THE Surrey Clinic Limited | Other services | 2019 |
| THE Tape Company Group Limited | Financial services | 2021 |
| THE Taps & Brew Ltd | Hospitality | 2022 |
| THE Temperance Movement Ltd | Information & communication | 2025 |
| THE Thundering Herd Limited | Wholesale & retail | 2007 |
| THE Transformation Bridge Ltd | Other services | 2010 |
| THE Treasures Inside Limited | Wholesale & retail | 2021 |
| THE Tuck Box (Andover) Limited | Manufacturing | 1999 |
| THE Vibrations Music Ltd | Arts & recreation | 2022 |
| THE Voiceover Network Ltd | Arts & recreation | 2015 |
| THE Wellbeing DEN Ltd | Education | 2026 |
| THE Wellness Agency Limited | Other services | 2017 |
| THE Wellness Cabin Ltd | Arts & recreation | 2009 |
| THE Wine Sisters Ltd | Wholesale & retail | 2021 |
| THE Winemaker’S Cellar Limited | Wholesale & retail | 2026 |
| THE Wise Lotus Ltd | Wholesale & retail | 2021 |
| THE Workstation Bellingham House Limited | Real estate | 2014 |
| THE Workstation Claridge CT Ltd | Real estate | 2022 |
| THE Workstation Director General's House Ltd | Real estate | 2018 |
| THE Workstation Holdings Ltd | Real estate | 2013 |
| THE Workstation KHH Ltd | Real estate | 2015 |
| THE Workstation London Road Ltd | Real estate | 2020 |
| THE Workstation Markham House Ltd | Real estate | 2017 |
| THE Workstation Rivers Lodge Limited | Real estate | 2016 |
| THE Workstation Three Gables Ltd | Real estate | 2013 |
| THE Workstation VOS Ltd | Real estate | 2021 |
| THE Wright Investment Group Ltd | Administrative & support | 2008 |
| THE Wymondley House Management Company Limited | Households | 2000 |
| THE Yerba Co. Ltd | Wholesale & retail | 2025 |
| THE Yoga Hall Ltd | Other services | 2003 |
| Thecleaningstopco Ltd | Administrative & support | 2026 |
| Thedoitcompany Ltd | Hospitality | 2023 |
| Thenextsales UK Limited | Information & communication | 2020 |
| Theopop Ltd | Wholesale & retail | 2026 |
| Theorycraft Ltd | Information & communication | 2019 |
| Thepuddingstop Ltd | Hospitality | 2010 |
| Theskinspa Ltd | Other services | 2022 |
| Thetechexpert Ltd | Information & communication | 2022 |
| They'Re NOT My Teeth Limited | Health & social care | 2026 |
| Thiago VF Ltd | Professional & scientific | 2023 |
| Thimba Holdco (UK) Limited | Financial services | 2023 |
| Thimba Midco (UK) Limited | Financial services | 2023 |
| Think Big Computing Ltd | Education | 2016 |
| Think GP Limited | Health & social care | 2026 |
| Think of ME Limited | Professional & scientific | 2009 |
| Thinks Colour Limited | Information & communication | 2010 |
| Third Culture Ventures Ltd | Professional & scientific | 2022 |
| This IS Jungle Holdings Limited | Financial services | 2021 |
| Thompson and Williams Limited | Real estate | 2020 |
| Thompson Meharg Ltd | Real estate | 2025 |
| Thoree TKD Ltd | Arts & recreation | 2019 |
| Thorpe Park Buses Limited | Transport & logistics | 2019 |
| Those Interesting People Limited | Professional & scientific | 2025 |
| Those Wonderful Folks Limited | Professional & scientific | 2025 |