| Creating Beyond Imagination Ltd | Education | 2023 |
| Credence Wealth Management Ltd | Financial services | 2021 |
| Cremad Ltd | Construction | 2016 |
| Crestview Property Limited | Real estate | 2017 |
| Crewmen Ltd | Construction | 2014 |
| Cricket Products Ltd | Wholesale & retail | 2024 |
| Cris Builders Ltd | Construction | 2020 |
| Cris+Ar Ltd | Transport & logistics | 2024 |
| Crisd & Company Ltd | Transport & logistics | 2019 |
| Crispy Fried Chicken Grays Ltd | Hospitality | 2025 |
| Cristal Cris Ltd | Health & social care | 2016 |
| Cristeel Ltd | Professional & scientific | 2023 |
| Cristi MOX Limited | Transport & logistics | 2015 |
| Cristian SAY Ltd | Transport & logistics | 2017 |
| Cristoloveanu's Ltd | Transport & logistics | 2015 |
| Criticalcare Services Ltd | Health & social care | 2019 |
| Critrans Ltd | Transport & logistics | 2019 |
| CRM Property Invest Ltd | Real estate | 2025 |
| Croftdell Holdings Limited | Professional & scientific | 1983 |
| Cromwell & Grays Ltd | Wholesale & retail | 2025 |
| Crondall Place (Property Services) Ltd | Real estate | 2020 |
| Crondall Place Ltd | Financial services | 2019 |
| Crow Auto Services Limited | Wholesale & retail | 1968 |
| Crown Grooming Limited | Other services | 2016 |
| Crown Hair Salon Ltd | Other services | 2023 |
| Crown Properties Real Estate Limited | Real estate | 2025 |
| Crowngate Consulting Limited | Administrative & support | 2016 |
| Crownguard Security Services Ltd | Administrative & support | 2019 |
| Crownhustle Ltd | Professional & scientific | 2026 |
| Crusely Trailer Engineering Limited | Wholesale & retail | 1977 |
| Crystal Clear Sound Ltd. | Information & communication | 2013 |
| Crystal Gold Care and Support Services Ltd | Administrative & support | 2025 |
| CS & L Group Limited | Transport & logistics | 2021 |
| CS Burgers and Wings Ltd | Hospitality | 2025 |
| CS Executive Chauffeur Services Limited | Transport & logistics | 2022 |
| CS Keystone Ltd | Professional & scientific | 2025 |
| CS Southend Ltd | Hospitality | 2025 |
| CS Team Ltd | Construction | 2015 |
| Csep Edmund Ltd | Transport & logistics | 2015 |
| CSG Worldwide Logistics Ltd | Transport & logistics | 2022 |
| CSJ Roofing Ltd | Construction | 2025 |
| CSM Haulage Contractors Limited | Transport & logistics | 1984 |
| CSM Storage & Archives Limited | Administrative & support | 2002 |
| CSP Building & Groundworks Ltd | Construction | 2023 |
| CST Elite Basketball Ltd | Education | 2026 |
| CTA Construction Services Ltd | Construction | 2013 |
| CTL Transport Limited | Transport & logistics | 2014 |
| Cube STM Limited | Construction | 2011 |
| Cuddle Cloud Ltd | Wholesale & retail | 2024 |
| Cullen Communications Limited | Other services | 2025 |
| Cultural Fashion Legacy CIC | Administrative & support | 2026 |
| Culturise Limited | Administrative & support | 2009 |
| Cumbers Trading Ltd | Financial services | 2011 |
| Curae Technologies Limited | Manufacturing | 2018 |
| Custom Grays Limited | Hospitality | 2026 |
| Custom Kitchen Solutions Ltd | Construction | 2024 |
| CVP Prime Logistic Ltd | Transport & logistics | 2026 |
| CWR Bar Group Ltd | Hospitality | 2024 |
| Cyberbyte Technologies Ltd | Information & communication | 2024 |
| Cybernova IT Ltd | Information & communication | 2025 |
| Cybrix 360 AI Limited | Information & communication | 2024 |
| Cybrus IT Limited | Administrative & support | 2021 |
| Cyclone Air Management Ltd | Construction | 2025 |
| Cygflare Ltd | Information & communication | 2022 |
| Cynosure Homes Ltd | Hospitality | 2019 |
| Cytro Ltd | Transport & logistics | 2018 |
| Czar Global Alliance Limited | Information & communication | 2025 |
| D & C Glass & Glazing Limited | Construction | 2008 |
| D & D Pointing Ltd | Construction | 2019 |
| D & M Transport (UK) Ltd | Transport & logistics | 2014 |
| D & R & M Construction Limited | Construction | 2024 |
| D & V Electrical Ltd | Construction | 2022 |
| D - Luca Transport Limited | Transport & logistics | 2026 |
| D a Massett Ltd | Manufacturing | 2017 |
| D Auto Art Limited | Wholesale & retail | 2016 |
| D Barstys Ltd | Real estate | 2020 |
| D Chapman Electrical Services Ltd | Construction | 2014 |
| D G F Training Limited | Education | 2016 |
| D Garage Ltd | Wholesale & retail | 2021 |
| D H Kennett Ltd | Other services | 2018 |
| D J Karlettis Ltd | Construction | 2025 |
| D J Nash Ltd | Construction | 2023 |
| D R Finance Change Solutions Ltd | Financial services | 2018 |
| D Russell Engineering Limited | Manufacturing | 2017 |
| D S Duhra Ltd | Financial services | 2015 |
| D&A Auto Selling Ltd | Wholesale & retail | 2023 |
| D&A Drywall Ltd | Construction | 2021 |
| D&A HD Property Services Ltd | Real estate | 2025 |
| D&B Serv Ltd | Transport & logistics | 2020 |
| D&D Solutions PVT Ltd | Information & communication | 2021 |
| D&K Scaffolding Ltd. | Construction | 2026 |
| D&L Transport LA Limited | Transport & logistics | 2025 |
| D&L Travel Ltd | Transport & logistics | 2025 |
| D&P Cleaning Services Ltd | Administrative & support | 2010 |
| D'Tripple T Limited | Wholesale & retail | 2026 |
| D. Bond Properties Ltd | Real estate | 2021 |
| D. Griffiths Ltd | Real estate | 2004 |
| D.I.B Consultancy Limited | Professional & scientific | 2024 |
| D.W. Interiors (London ) Limited | Professional & scientific | 2015 |
| D1CED Ltd | Wholesale & retail | 2025 |