| THE Baskerville Estates Partnership | | 2003 |
| THE Beacon Lodge Charitable Trust | Health & social care | 1937 |
| THE Beautiful Distribution Company Ltd | Wholesale & retail | 2014 |
| THE Beckh Company Limited | Professional & scientific | 2020 |
| THE Bell Stoke Mandeville Ltd | Other services | 2018 |
| THE Bell Tring Limited | Hospitality | 2017 |
| THE BEN Holden Group Ltd | Financial services | 2023 |
| THE Best Disco in Town Ltd | Administrative & support | 2016 |
| THE Best Floor Sanding Ltd | Construction | 2023 |
| THE Big Marquee Company Ltd | Other services | 2017 |
| THE Bike Shop (Watford) Limited | Wholesale & retail | 2021 |
| THE Bloom Parlour Ltd | Wholesale & retail | 2026 |
| THE Blue Iris Partnership Limited | Professional & scientific | 2019 |
| THE Board Accelerator Limited | Professional & scientific | 2015 |
| THE Board Shack Ltd | Professional & scientific | 2019 |
| THE Boarding Company Limited | Wholesale & retail | 2005 |
| THE Bourdon I Partnership | | 2002 |
| THE Bourdon II Partnership | | 2002 |
| THE Bourdon III Partnership | | 1997 |
| THE Bourdon IV Partnership | | 2000 |
| THE Bravo Gallego and Co Ltd | Professional & scientific | 2025 |
| THE Bridghts Ltd | Professional & scientific | 2018 |
| THE British Band Instrument Company Limited | Administrative & support | 2008 |
| THE British Polio Fellowship | Administrative & support | 2004 |
| THE Cafe in the Park (Rickmansworth) Limited | Hospitality | 2008 |
| THE Callanders Management Company Limited | Households | 1988 |
| THE Camera Department Limited | Administrative & support | 2011 |
| THE Capsule Productions Limited | Information & communication | 2024 |
| THE Carp Firm Limited | Wholesale & retail | 2011 |
| THE Castle of Unicorns Ltd | Professional & scientific | 2026 |
| THE Cavallari Company Limited | Real estate | 2019 |
| THE Cedar ARK Limited | Wholesale & retail | 2025 |
| THE Cedars (Tring) Management Company Ltd | Real estate | 2016 |
| THE Cell Strategy Limited | Professional & scientific | 2009 |
| THE Change Makers Academy Limited | Administrative & support | 2024 |
| THE Chantries Management Company (Stanmore) Limited | Real estate | 2007 |
| THE Cheeky Chimps Books Limited | Administrative & support | 2015 |
| THE City Financial & Co Limited | Financial services | 2014 |
| THE Claims Centre Kenya Ltd | Professional & scientific | 2025 |
| THE Classic Sovereign Partnership Limited | Real estate | 1999 |
| THE Clay Club Ltd | Manufacturing | 2022 |
| THE Clever Move Limited | Financial services | 2005 |
| THE Cloth Collective Ltd | Wholesale & retail | 2025 |
| THE Coldridge Collection Limited | Manufacturing | 2021 |
| THE Collection Service Limited | Professional & scientific | 1999 |
| THE Combined Services Provider Limited | Administrative & support | 1990 |
| THE Copy Studio Ltd | Professional & scientific | 2019 |
| THE Corcoran Partnership Limited | Construction | 2007 |
| THE Corporate Consortium Limited | Administrative & support | 1996 |
| THE Cosmetic Hygienist Ltd | Health & social care | 2023 |
| THE Creates Group Ltd | Professional & scientific | 2023 |
| THE Cultured Collective Limited | Wholesale & retail | 2018 |
| THE Curvy Club Ltd | Wholesale & retail | 2020 |
| THE DAN Tien Limited | Education | 2011 |
| THE Dawn Foundation Limited | Education | 2019 |
| THE Declutter Nutter Limited | Other services | 2023 |
| THE Deionised Water Company Ltd | Manufacturing | 2019 |
| THE DEN Strength and Conditioning CIC | Arts & recreation | 2020 |
| THE Diabetic Pregnancy Study Group | Health & social care | 2016 |
| THE Dick Whittington Ltd | Hospitality | 2020 |
| THE Digital Recruitment Company Limited | Administrative & support | 2018 |
| THE Dinky Kids App Ltd | Information & communication | 2025 |
| THE Door Guys Ltd | Manufacturing | 2023 |
| THE Dunes & Flame Project Limited | Wholesale & retail | 2025 |
| THE Earth Factory Ltd | Extraterritorial | 2020 |
| THE East India Dock Partnership | | 2000 |
| THE Easy Marketing Company Limited | Information & communication | 2025 |
| THE Eclipse Industrial Centre (Watford) Management Company Limited | Real estate | 2010 |
| THE Elementary Estates Partnership | | 2003 |
| THE Elms Group Limited | Arts & recreation | 1989 |
| THE Empowerment Centre Ltd | Education | 2008 |
| THE Eternal OM Ltd | Real estate | 2022 |
| THE Exchange Residents Company Limited | Hospitality | 2015 |
| THE Exodus Corporate Ltd | Administrative & support | 2022 |
| THE EYE Shop Ltd | Wholesale & retail | 2008 |
| THE Fable Fund Limited | Professional & scientific | 2010 |
| THE Fabric Cave Ltd | Wholesale & retail | 2017 |
| THE Fabric Hub Ltd | Wholesale & retail | 2026 |
| THE Film Feast Ltd | Hospitality | 2025 |
| THE Finiq Group Ltd | Transport & logistics | 2022 |
| THE Finishing Team Ltd | Construction | 2024 |
| THE Fit Flamingo London Ltd | Arts & recreation | 2018 |
| THE Fone Shop (Hertfordshire) Ltd | Wholesale & retail | 2015 |
| THE Forest Bench Ltd | Hospitality | 2026 |
| THE Fountains (Management) Limited | Real estate | 1991 |
| THE Freehold Group Limited | Real estate | 1999 |
| THE Friends of Nascot Ltd | Extraterritorial | 2022 |
| THE G Lounge Ltd | Hospitality | 2020 |
| THE Galleries Residents' Association Limited | Real estate | 1998 |
| THE Gateway SPV Ltd | Real estate | 2016 |
| THE George Street Management Company Limited | Hospitality | 1987 |
| THE Giving Cube Ltd | Manufacturing | 2024 |
| THE Glen Sied Ltd | Construction | 2021 |
| THE Golden Attic Ltd | Wholesale & retail | 2026 |
| THE Good Global Lifestyle Limited | Wholesale & retail | 2015 |
| THE Gossamers 1971 Limited | Extraterritorial | 2014 |
| THE Great Generation | Administrative & support | 2005 |
| THE Green Shop Watford Ltd | Manufacturing | 2023 |
| THE Greyhound Tring Ltd | Hospitality | 2017 |
| THE Griots Theatre Ltd | Administrative & support | 2026 |