| Churros Garcia Frozen Ltd | Hospitality | 2016 |
| Churros Garcia Ltd. | Hospitality | 2011 |
| Circus Digital Limited | Professional & scientific | 2009 |
| CJJ Electrics Limited | Construction | 2010 |
| CK Draughting and Design Services Ltd | Professional & scientific | 2016 |
| CK Property Management Group Ltd | Real estate | 2024 |
| Cleanline Installations Limited | Information & communication | 1992 |
| Cleanserve ES Ltd | Administrative & support | 2020 |
| Cliffco UK Ltd | Construction | 2022 |
| Clover Group International Limited | Transport & logistics | 1993 |
| CLR Accountancy Services Limited | Professional & scientific | 2012 |
| Codesome Ltd | Information & communication | 2016 |
| Codexitsolutions Limited | Information & communication | 2025 |
| COFFEE4WORK Limited | Wholesale & retail | 2021 |
| Collaborate Future Ready CIC | Education | 2024 |
| Collaborate Sports Ltd | Professional & scientific | 2023 |
| Collaborate Sports Mentoring Ltd | Education | 2024 |
| Collaborative Contracts Limited | Administrative & support | 2021 |
| Comms and Cabling Ltd | Information & communication | 2018 |
| Concise Compliance Ltd | Administrative & support | 2021 |
| Concordia Energy Limited | Mining & quarrying | 2024 |
| Concordia Energy Operations Limited | Mining & quarrying | 2026 |
| Construction Technologies Ltd | Construction | 2025 |
| Contact Centre Designs Limited | Information & communication | 2014 |
| CORE6 Craneswood Ltd | Construction | 2022 |
| Corneilles Heating and Property Services Ltd | Construction | 2010 |
| Cosmo Advisory Ltd | Professional & scientific | 2024 |
| Cottage Peri Peri Chicken Ltd | Hospitality | 2025 |
| Craig Tech Solutions Ltd | Administrative & support | 2009 |
| Creative Making Limited | Education | 2020 |
| Crescendo Systems Limited | Information & communication | 2003 |
| Crescita Associates Ltd | Administrative & support | 2007 |
| Cricket Wisdom Limited | Arts & recreation | 2013 |
| CTS Productions Limited | Information & communication | 2017 |
| CTS UK Properties Limited | Real estate | 2020 |
| Cuffy’S Carpentry Ltd | Construction | 2025 |
| Cultism Limited | Administrative & support | 2013 |
| Custard Cloth Ltd | Manufacturing | 2020 |
| Custard Credits Ltd | Real estate | 2016 |
| D L R Leadwork & Roofing Limited | Construction | 2024 |
| D Williams Carpentry & Building Limited | Construction | 2004 |
| D.A.Y Technical Solutions Limited | Professional & scientific | 2016 |
| DAB Interactive Limited | Professional & scientific | 2019 |
| Dascra Limited | Professional & scientific | 2010 |
| Dashwood Productions Ltd | Information & communication | 2023 |
| Data Frog Analytics Limited | Information & communication | 2024 |
| Datawonders Ltd | Professional & scientific | 2015 |
| Dateinadash Ltd | Other services | 2021 |
| David Seager & Associates Limited | Professional & scientific | 2014 |
| DAW Services Ltd | Professional & scientific | 2026 |
| Day Engineering Services Ltd | Professional & scientific | 2021 |
| DE Haan Properties Limited | Construction | 2013 |
| DE Haan Property Consultants Ltd | Other services | 2021 |
| Dear Construction Limited | Construction | 2024 |
| Delahay Clifford Limited | Information & communication | 2004 |
| Delahay Consulting Ltd | Information & communication | 2019 |
| Deli Terra E Mare Ltd | Hospitality | 2024 |
| Denver Technology (Europe) Limited | Information & communication | 1997 |
| Detail Metalwork Ltd | Manufacturing | 2010 |
| Deus Dedit Ltd | Households | 2024 |
| Deus Eggs Machina Ltd | Information & communication | 2025 |
| DEV Hospitality T/A Harrow Inn Limited | Hospitality | 2023 |
| Developing Resilient Learners Ltd | Education | 2018 |
| Dial House (Shepperton) Limited | Households | 1988 |
| Diamond Decorating Services Limited | Construction | 2018 |
| Diamond Garden Care (Weybridge) Limited | Administrative & support | 2006 |
| Dickersonross Investments Limited | Real estate | 2021 |
| Digi Goose Limited | Professional & scientific | 2024 |
| Digital Politics Ltd | Information & communication | 2025 |
| Digitalopment Limited | Administrative & support | 2020 |
| DIK Gregory Consulting Limited | Professional & scientific | 1995 |
| Dillon Formworks Ltd | Construction | 2016 |
| Dishing the Dirt Plant Hire Ltd | Construction | 2026 |
| DJW SFX Ltd | Information & communication | 2011 |
| DNA Site Management Consultancy Ltd | Professional & scientific | 2021 |
| Dominion Pictures Ltd | Information & communication | 2005 |
| Dovid Construction Ltd | Construction | 2016 |
| Dowling Consulting Ltd | Professional & scientific | 2015 |
| Down 2 Earth Landscape & Ground Designs Ltd | Professional & scientific | 2026 |
| DR Lucy Brazil Neuro-Oncology Ltd | Health & social care | 2024 |
| DR Physique Limited | Arts & recreation | 2013 |
| DREAM4EVER Ltd | Real estate | 2025 |
| DRT Building and Landscaping Limited | Construction | 2022 |
| Drym Ltd | Construction | 2018 |
| DS Air Conditioning Limited | Manufacturing | 2016 |
| DS Associates (UK) Limited | Transport & logistics | 2000 |
| Dspal Ltd | Professional & scientific | 2019 |
| Dunphy & Hayes Limited | Professional & scientific | 1988 |
| Dwlogic Limited | Information & communication | 2021 |
| Dynamic Systems Consulting Limited | Professional & scientific | 2024 |
| Dyos Brothers Haulage Ltd | Transport & logistics | 2024 |
| Eand Investments Ltd | Financial services | 2024 |
| Earthstone Developments Ltd | Construction | 2016 |
| Echelon Club Limited | Arts & recreation | 2025 |
| Echelon Group Holdings Limited | Real estate | 2026 |
| Echelon Group International Limited | Administrative & support | 2014 |
| Ecohelios Limited | Construction | 2026 |
| Ecom Infinite Ltd | Wholesale & retail | 2023 |
| Ecopoint Biomass Ltd | Water & waste | 2026 |
| EDW Homes Ltd | Construction | 2020 |