| Digital View Limited | Manufacturing | 1995 |
| Disciple London Ltd | Professional & scientific | 2019 |
| DJ Monk Limited | Wholesale & retail | 2026 |
| Doorstep Solutions Limited | Professional & scientific | 2025 |
| Doug Mckenna Safety Services Ltd | Information & communication | 2021 |
| Doyle Boyle Limited | Professional & scientific | 2020 |
| DR Apollo Ltd | Health & social care | 2022 |
| Drapers Material Handling Ltd | Manufacturing | 2013 |
| Drapur Ltd | Real estate | 2025 |
| Dvsi Group Ltd | Financial services | 2023 |
| Dvsi Limited | Wholesale & retail | 2008 |
| E Vehicle Power Sports Limited | Wholesale & retail | 2026 |
| Eagman Services Ltd | Health & social care | 2022 |
| Easter Trees Community Interest Company | Other services | 2026 |
| Ecrips Wholesale Ltd | Wholesale & retail | 2022 |
| Eecj Homecare Limited | Health & social care | 2024 |
| Eecj Prestige Care Workforce Limited | Administrative & support | 2026 |
| Elan Properties (Hlse) Limited | Financial services | 2017 |
| Elder & Thorn Limited | Manufacturing | 2025 |
| Elley London Ltd | Public administration | 2022 |
| Elley Ltd | Health & social care | 2016 |
| Ellyn Iacovou Ltd | Professional & scientific | 2025 |
| Elmtime Ltd | Wholesale & retail | 2004 |
| EO Projects Limited | Professional & scientific | 2009 |
| Ethos Home Living Ltd | Wholesale & retail | 2026 |
| Eventzing Limited | Extraterritorial | 2010 |
| EVER3 Ltd | Hospitality | 2024 |
| Fadra Homes Ltd | Real estate | 2020 |
| FAT Cat Claims Ltd | Administrative & support | 2024 |
| Fencam Limited | Financial services | 2022 |
| Fenchurch (Hertfordshire) Limited | Construction | 2011 |
| FGS Building and Decorating Contractors Limited | Construction | 2001 |
| Figoura Ltd | Education | 2014 |
| Fire for Christ Church Ltd | Other services | 2026 |
| Fire for Christ Ministry Ltd | Health & social care | 2021 |
| Fitboo Limited | Manufacturing | 2021 |
| Forbidden Theatre Company | Arts & recreation | 1996 |
| Frikkx Consultancy Ltd | Professional & scientific | 2019 |
| Games of Skill Limited | Information & communication | 1982 |
| Garden Court (Woolmer Green) Residents Ltd | Households | 2002 |
| GAS Advertising Ltd | Professional & scientific | 2011 |
| Gazey and Partners LLP | | 2003 |
| Ginger & Blue Ltd | Information & communication | 2014 |
| Global 54 Aviation Ltd | Transport & logistics | 2022 |
| Globe Associates UK Limited | Education | 1999 |
| Goodhome Limited | Wholesale & retail | 2002 |
| Gwyndolyn Gibson Radmed Ltd | Hospitality | 2021 |
| H Bryant Consulting Ltd | Professional & scientific | 2018 |
| Haven Developments Limited | Construction | 1988 |
| Heartwood Support Limited | Administrative & support | 2022 |
| Helms Capital Ltd | Real estate | 2022 |
| Helms Developments Ltd | Construction | 2024 |
| Helms Group Holdings Ltd | Financial services | 2024 |
| Helms Regeneration Ltd | Construction | 2024 |
| Help Internet Limited | Information & communication | 2001 |
| Hertford Tree Care Ltd | Agriculture & fishing | 2025 |
| Hertfordshire Golf Limited | Arts & recreation | 2017 |
| Herts & London Electrical Limited | Construction | 1997 |
| Herts Anaesthesiacare LLP | | 2015 |
| Herts Microsuction Ltd | Health & social care | 2023 |
| Hestia Phoenix Property Ltd | Construction | 2019 |
| High Flying Finance Limited | Construction | 2008 |
| Hoka Limited | Professional & scientific | 2011 |
| Homeful Properties Ltd | Hospitality | 2026 |
| Hytec Communications Ltd | Professional & scientific | 2002 |
| ID Compliance Experts Ltd | Wholesale & retail | 2024 |
| Information Miners Limited | Information & communication | 2017 |
| Inky Design Graphics Ltd | Professional & scientific | 2010 |
| Innovative Ventilation Solutions Limited | Construction | 2019 |
| Interact Group Ltd | Financial services | 2021 |
| Interact Marketing Ltd | Professional & scientific | 2021 |
| Ipcress Limited | Information & communication | 2013 |
| IRP Services Ltd. | Information & communication | 2019 |
| Jackdavidsonlogistics Ltd | Arts & recreation | 2025 |
| Jaylex Property Maintenance Ltd | Construction | 2025 |
| JCN Consultancy Limited | Professional & scientific | 2020 |
| JHT Chopra & Sons Limited | Real estate | 2021 |
| JLJ Scientific Services Limited | Administrative & support | 2021 |
| JPA Invest Limited | Real estate | 2015 |
| Jprop Limited | Real estate | 2004 |
| JPW Sound Ltd | Information & communication | 2016 |
| Kapoor Properties Investment Limited | Real estate | 2017 |
| Kawarau Consulting Limited | Information & communication | 2015 |
| KGS Landscaping & Ground Works Ltd | Administrative & support | 2026 |
| Kirby Wakefield Property Limited | Real estate | 2018 |
| Kitchen Bathroom & Tile Co Limited | Wholesale & retail | 2023 |
| Knebworth Food and Wine Ltd | Wholesale & retail | 2025 |
| Knebworth Golf Club (the) Limited | Arts & recreation | 1929 |
| Knebworth Limited | Wholesale & retail | 2013 |
| Knebworth Nail Bar Ltd | Other services | 2017 |
| Knebworth Pilates Studio Ltd | Arts & recreation | 2020 |
| Knebworth Refinishing Limited | Wholesale & retail | 2026 |
| Knebworth Village Store Ltd | Wholesale & retail | 2014 |
| Knudge Limited | Wholesale & retail | 2012 |
| L'Essentiel Ltd | Wholesale & retail | 2020 |
| Lbros Limited | Transport & logistics | 2020 |
| LCS Investments Ltd. | Real estate | 2015 |
| Learner Driver Services Ltd | Education | 2021 |
| Lessiters Limited | Manufacturing | 1977 |
| Little Surprises Ltd | Wholesale & retail | 2021 |