| Cosy Living Housing Ltd | Real estate | 2024 |
| Coure DA Napoli Ltd | Hospitality | 2026 |
| CR Rooflng Ltd | Construction | 2025 |
| Cragmore Limited | Construction | 1987 |
| CRF Brickworks Ltd | Construction | 2020 |
| CRX Automotive Ltd | Wholesale & retail | 2023 |
| Crynto Dynamics Limited | Real estate | 2025 |
| CTB Construction Limited | Construction | 2021 |
| Cwhl Holdings Limited | Real estate | 2019 |
| D D Thomas Limited | Information & communication | 2021 |
| D W Nute Associates Limited | Professional & scientific | 2006 |
| D.Ebden Engineering Limited | Construction | 1999 |
| Daaks Surya Limited | Real estate | 2018 |
| Daband Ltd | Construction | 2026 |
| Dairy Way Residents Company Limited | Real estate | 1996 |
| Data Decor Limited | Other services | 2014 |
| Deltec Ltd | Information & communication | 2016 |
| Democycle Limited | Water & waste | 2019 |
| DEN Helder Ltd | Professional & scientific | 2023 |
| Dena Growth Ltd | Administrative & support | 2024 |
| Dewsbury Road Property Estates Limited | Real estate | 2020 |
| Ditr Ltd | Information & communication | 2023 |
| Djnservices Ltd | Construction | 2013 |
| DKV Advisors Limited | Financial services | 2015 |
| Dlshqg Limited | Education | 2025 |
| Domestic Care and Repair Ltd | Other services | 2021 |
| Dotz Ltd | Manufacturing | 2024 |
| Dougie's Buggies Ltd | Administrative & support | 2025 |
| DP Office Supplies Ltd | Administrative & support | 2020 |
| DP Trading (UK) Limited | Wholesale & retail | 2012 |
| Drofdar Limited | Wholesale & retail | 2016 |
| DV Interiors Ltd | Construction | 2016 |
| Dyslexic Way Ltd | Education | 2024 |
| East Barnet Road Limited | Professional & scientific | 2025 |
| EDJ Travel Ltd | Administrative & support | 2021 |
| Edwards & Edwards Construction Ltd | Construction | 2008 |
| Electric Promotions Limited | Administrative & support | 2009 |
| Elevate Solutions (Group) Limited | Administrative & support | 2024 |
| Elite Green Leaf Tree Care Ltd | Professional & scientific | 2021 |
| Emchai Barnet Limited | Hospitality | 2015 |
| Emma Sills Coaching Limited | Education | 2024 |
| Entec Facilities Ltd | Manufacturing | 2021 |
| Entec Facilities Management Ltd | Construction | 2002 |
| Equality Focus Ltd | Education | 2012 |
| ETC... Everything Tea and Coffee Ltd | Hospitality | 2014 |
| ETCH13 Capital Ltd | Financial services | 2025 |
| Evolve Adaptations Ltd | Construction | 2026 |
| Evolve Install Ltd | Manufacturing | 2016 |
| Evolve Power Ltd | Construction | 2025 |
| Excellence & Growth Partners Ltd | Information & communication | 2025 |
| Exoriacars Ltd | Wholesale & retail | 2022 |
| Expert Electrical Engineering Ltd | Construction | 2021 |
| Express Stairs Limited | Manufacturing | 2007 |
| Expression Topco Limited | Hospitality | 2026 |
| EYH Holdings Limited | Professional & scientific | 2020 |
| EZ Shelters Ltd | Real estate | 2025 |
| Fava Developments Limited | Real estate | 2019 |
| Film and TV Works Limited | Information & communication | 2020 |
| Firefox IT Ltd | Information & communication | 2024 |
| Five Star Enterprise Limited | Wholesale & retail | 2012 |
| Fmgc Solutions Ltd | Wholesale & retail | 2025 |
| Focus TSP Ltd | Wholesale & retail | 2016 |
| Foyer Green Ltd | Wholesale & retail | 2023 |
| Foyer Green Stays Ltd | Real estate | 2025 |
| Fresh Capital Ltd | Professional & scientific | 2025 |
| Fresh Interior Solutions Ltd | Professional & scientific | 2023 |
| Fresh Wave Ltd | Wholesale & retail | 2020 |
| Friends of Tariro | Health & social care | 2013 |
| Friern Barnet Road Limited | Professional & scientific | 2025 |
| Funeral Car Support Limited | Transport & logistics | 2023 |
| G & K Developments & Properties Ltd | Construction | 2021 |
| G&G General Building Ltd | Construction | 2021 |
| Garratts Damp & Timber Limited | Construction | 2008 |
| Geard Project Management Ltd | Professional & scientific | 2026 |
| Genova Life Limited | Health & social care | 2025 |
| Giannone Ltd | Professional & scientific | 2026 |
| GID Kitchens and Bathrooms Ltd | Construction | 2024 |
| Ginger Solutions (Digital Solutions) Limited | Information & communication | 2024 |
| Gogaming Limited | Information & communication | 2004 |
| Golden East Ltd | Hospitality | 2023 |
| Gollins Holdings Ltd | Financial services | 2019 |
| Good Movement Ltd | Wholesale & retail | 2020 |
| Goody's Media Limited | Other services | 2026 |
| GP Building Services Ltd | Construction | 2013 |
| Graeme Acting and Consulting Ltd | Professional & scientific | 2023 |
| Great Northern Locomotives Limited | Transport & logistics | 1997 |
| Grove Beech Limited | Real estate | 1999 |
| Groveridge Limited | Households | 2006 |
| GSL Products Ltd | Manufacturing | 2021 |
| Hamilton Barnes Group Limited | Construction | 2026 |
| Handbuilt by Robots Limited | Professional & scientific | 2019 |
| Haydon Hill Paving Limited | Administrative & support | 2013 |
| Hd-Hr Legal Services Ltd | Administrative & support | 2024 |
| Herga Folk Club Community Interest Company | Arts & recreation | 2023 |
| Hertfordshire Opera Limited | Education | 2025 |
| Herts Building & Landscaping Ltd | Construction | 2026 |
| HH Paving Ltd | Administrative & support | 2024 |
| Hickey Ltd | Construction | 2002 |
| Hinks Propco Limited | Real estate | 2026 |
| Hitch MD Ltd | Transport & logistics | 2022 |