| A & E Maintenance Services Ltd | Extraterritorial | 2016 |
| Acugrip Ltd | Professional & scientific | 2023 |
| Albrs Ltd | Information & communication | 2020 |
| Andrew Wright Management Services Ltd | Real estate | 2014 |
| Anna Roughley International Consulting Limited | Education | 2015 |
| Anthony Campbell Creative Ltd | Information & communication | 2020 |
| Art Marketing Limited | Manufacturing | 1980 |
| Ashton & Clark Ltd | Construction | 2013 |
| Berkeley Private Finance Limited | Financial services | 2000 |
| Bitesize Safety Ltd | Professional & scientific | 2022 |
| Black Eyewear Ltd | Health & social care | 1979 |
| Bluedaisy Marketing Ltd | Administrative & support | 2010 |
| Bondi Rise Limited | Arts & recreation | 2022 |
| Broughton Commercial Management Ltd | Professional & scientific | 2019 |
| Charlotte Benjamin Ltd | Real estate | 2022 |
| Creative Managed Solutions Limited | Information & communication | 2009 |
| Cricks Bars Ltd | Hospitality | 2026 |
| D.K Heating and GAS Ltd | Construction | 2022 |
| Dark Matter Composites Limited | Manufacturing | 2005 |
| Datalogic Real Estate UK Limited | Real estate | 1982 |
| DBM Components Ltd | Professional & scientific | 2018 |
| DCC Carpentry Limited | Construction | 2013 |
| Deans Holding Limited | Financial services | 2022 |
| Diamond Bodycraft Ltd | Wholesale & retail | 2016 |
| Dovetail Construction Ltd | Construction | 2014 |
| Ectech Ltd | Professional & scientific | 2017 |
| EJM Investments Limited | Financial services | 2023 |
| Elephant Shack Ltd | Hospitality | 2014 |
| Enivob 26 Limited | Professional & scientific | 1999 |
| Expert Resin Ltd | Construction | 2021 |
| FAB PR Limited | Administrative & support | 2013 |
| Fides Works Limited | Professional & scientific | 2026 |
| Fine & Country Redbourn Ltd | Real estate | 2020 |
| FOX Project Consulting Ltd | Information & communication | 2016 |
| Garland Digital Ltd | Wholesale & retail | 2018 |
| Genevieve Louis Limited | Professional & scientific | 2000 |
| Ggggggggg Ltd | Professional & scientific | 2021 |
| GRP Property Services Ltd | Construction | 2023 |
| Harborough Court Management Company Ltd | Households | 2016 |
| Harwood Consultancy Limited | Administrative & support | 2016 |
| Henex Consulting Ltd | Professional & scientific | 2025 |
| Herts County Showground Ltd | Arts & recreation | 2005 |
| Hertsbrewco Ltd | Manufacturing | 2025 |
| IEN Limited | Information & communication | 2008 |
| Instalectric Company Limited | Real estate | 1973 |
| IO Test & Validation Ltd | Information & communication | 2000 |
| J P Electrical Limited | Construction | 2002 |
| J Sears Electrical Services Limited | Construction | 2003 |
| Jensen Smith Properties Limited | Real estate | 2025 |
| K & H Care Ltd | Health & social care | 2025 |
| Keywing Computer Services Limited | Information & communication | 1995 |
| Leach-Electrics Limited | Construction | 2010 |
| Line OUT Developments Ltd | Construction | 2019 |
| Lljw Limited | Administrative & support | 2012 |
| Lynnford Properties Limited | Real estate | 2025 |
| Manse Properties Limited | Households | 1985 |
| Merope ATE Limited | Manufacturing | 2017 |
| Mintdesignsuk Ltd | Information & communication | 2020 |
| Mitchell Property Holdings Ltd | Real estate | 2020 |
| Nigel Rayment Limited | Manufacturing | 1994 |
| Nogg Ltd | Extraterritorial | 2010 |
| Old Bell Court (Hemel Hempstead) Limited | Construction | 1987 |
| Oomahutt Ltd | Hospitality | 2018 |
| Prime Environmental Services Ltd | Administrative & support | 2010 |
| Principal Security Consultants Limited | Administrative & support | 2011 |
| R S Harding Ltd | Professional & scientific | 2010 |
| Raybuild Limited | Real estate | 1965 |
| Redbourn MOT Test Centre Limited | Wholesale & retail | 2023 |
| Rural Environment Management Limited | Other services | 2002 |
| S Johnston Properties Ltd | Real estate | 2023 |
| Sean Rayment Ltd | Wholesale & retail | 2001 |
| Shuzu Ltd | Wholesale & retail | 2014 |
| Square Circle Engineering Ltd | Professional & scientific | 2015 |
| Stanbridge Farms LLP | | 2024 |
| Stephen Johnson Therapy Ltd | Health & social care | 2022 |
| Stuart Henley and Partners Limited | Professional & scientific | 2008 |
| Sustainability on TAP Ltd | Administrative & support | 2025 |
| T&C Caddington Ltd | Financial services | 2020 |
| T&C Edlesborough Ltd | Financial services | 2020 |
| T&C Markyate Ltd | Financial services | 2020 |
| T&C Redbourn Ltd | Financial services | 2020 |
| Team Safety Services Limited | Administrative & support | 2009 |
| THE Industrial Door Company (Southern) Limited | Wholesale & retail | 2000 |
| THE Legal Press Ltd | Administrative & support | 2016 |
| THE Stem Property Group Limited | Financial services | 2020 |
| Think IT Services Limited | Information & communication | 2002 |
| Town & Country Caddington Ltd | Real estate | 2020 |
| Triumph Logistics Ltd | Transport & logistics | 2023 |
| ULA Ltd | Administrative & support | 2017 |
| Victory Solutions Ltd | Professional & scientific | 2021 |
| Watford Injury Clinic Ltd | Health & social care | 2025 |
| WM Interiors and Construction Ltd | Real estate | 2023 |
| X-Digital Ltd | Information & communication | 2010 |
| YAS Kitchen Ltd | Hospitality | 2026 |