| Cura Seating Company Ltd | Manufacturing | 2008 |
| Curated Essence & Co Ltd. | Arts & recreation | 2024 |
| Curator Wealth Management Limited | Extraterritorial | 2025 |
| Curlew Consultants Limited | Professional & scientific | 2023 |
| Currax Limited | Transport & logistics | 2020 |
| Current BUN Maternity Ltd | Wholesale & retail | 2021 |
| Curry Byte Limited | Wholesale & retail | 2000 |
| Curry Delight Yaxley Limited | Hospitality | 2024 |
| Curry ENN Ltd | Hospitality | 2025 |
| Curry House Express Ltd | Hospitality | 2025 |
| Curtain Time Entertainment Limited | Professional & scientific | 2009 |
| Curtains & Voiles Ltd | Manufacturing | 2014 |
| Curtis Automated Gate Experts Ltd | Manufacturing | 2022 |
| Curtis Communications Ltd | Professional & scientific | 2023 |
| Curtis Construction Ltd | Extraterritorial | 2017 |
| Curtis-Barden Limited | Professional & scientific | 2001 |
| Curtissfx Ltd | Other services | 2022 |
| Custom Building and Maintenance Ltd | Construction | 2016 |
| Custom Choice Home Improvements Ltd | Construction | 2020 |
| Custom Fencing Limited | Construction | 2004 |
| Custom Intelligence Limited | Professional & scientific | 2020 |
| Customer Faithful Limited | Professional & scientific | 2009 |
| Customers Matter Ltd | Professional & scientific | 2002 |
| Customs Flow Declare Ltd | Wholesale & retail | 2023 |
| Cutting Edge Tech Systems Ltd | Information & communication | 2009 |
| Cutting-Edge Properties Ltd | Real estate | 2022 |
| CWP Rentals Ltd | Real estate | 2021 |
| CWS Sound & Lighting Ltd | Information & communication | 2014 |
| Cxlondon Limited | Wholesale & retail | 2025 |
| CY Gardens Limited | Professional & scientific | 2020 |
| Cyber Overwatch Limited | Information & communication | 2023 |
| Cyber Talks Ltd | Information & communication | 2018 |
| Cyber Ware Limited | Information & communication | 1996 |
| Cyberair Limited | Information & communication | 2008 |
| Cybersecureprojects Ltd | Information & communication | 2023 |
| CYC Ventures Ltd | Financial services | 2023 |
| Cycle Shops Limited | Wholesale & retail | 2015 |
| Cycle Validation Services and Consultancy Ltd | Professional & scientific | 2018 |
| Cygma Property Ltd | Real estate | 2024 |
| Cygnet Cleaning Limited | Administrative & support | 2023 |
| Cygnet Property Maintenance Limited | Administrative & support | 2025 |
| Cygnet Services Group Holdings Limited | Financial services | 2023 |
| Cygnet Services Group Limited | Administrative & support | 2022 |
| Cygnus Marine Boats 2007 Limited | Manufacturing | 2012 |
| Cygnus Marine Boats Limited | Manufacturing | 2008 |
| CYS Group Holdings Limited | Financial services | 2024 |
| Cytal UK Limited | Information & communication | 2020 |
| Cyton Software Limited | Information & communication | 2013 |
| CZ Prints Ltd | Wholesale & retail | 2026 |
| Cztech Solutions Ltd | Construction | 2026 |
| D & a Properties UN Ltd | Real estate | 2018 |
| D & D Trans Ltd | Manufacturing | 2014 |
| D & EC (Cambridge) Ltd | Manufacturing | 2010 |
| D & M Milson Limited | Wholesale & retail | 2016 |
| D & S Lynch Housing Project Ltd | Real estate | 2022 |
| D & S SAI Convenience Store Limited | Wholesale & retail | 2021 |
| D & W Car Sales Ltd | Wholesale & retail | 2023 |
| D + E Architectural Hardware Limited | Wholesale & retail | 1994 |
| D 81 Auto Version Limited | Wholesale & retail | 2018 |
| D a Nonclinical Safety Ltd. | Professional & scientific | 2001 |
| D and J Scafollding Solutions Ltd | Construction | 2026 |
| D C M Wholesale Limited | Extraterritorial | 1986 |
| D Civils Ltd | Construction | 2022 |
| D Fellowes Brickwork Ltd | Construction | 2006 |
| D L Cars Ltd | Wholesale & retail | 2017 |
| D Lyford Roofing Ltd | Construction | 2013 |
| D Lynch Holdings Ltd | Financial services | 2022 |
| D M Groundwork Ltd | Construction | 2018 |
| D Moore and Co UK Limited | Wholesale & retail | 2020 |
| D N Premium Ltd | Real estate | 2015 |
| D Phillips Plumbing & Heating Ltd | Construction | 2020 |
| D S Fleet Maintenance Ltd | Wholesale & retail | 2026 |
| D T Stoves Ltd | Wholesale & retail | 2013 |
| D W Needham Motor Engineer Ltd | Wholesale & retail | 2005 |
| D W Norman Limited | Professional & scientific | 2004 |
| D Wade Ltd | Wholesale & retail | 2022 |
| D&A Ocean Trading Ltd | Financial services | 2015 |
| D&B Autos Ltd | Wholesale & retail | 2023 |
| D&C Electrical Maintenance Ltd | Construction | 2018 |
| D&E Fragrance Ltd | Wholesale & retail | 2026 |
| D&E Recruitment Ltd | Administrative & support | 2024 |
| D&G Resources Ltd | Real estate | 2021 |
| D&H Property Ltd | Real estate | 2015 |
| D&K Automotive Ltd | Wholesale & retail | 2025 |
| D&K Hospitality Limited | Hospitality | 2023 |
| D&L Rapid Property Solutions Limited | Construction | 2026 |
| D&L United Ltd | Wholesale & retail | 2020 |
| D&M Home Improvements Ltd | Construction | 2019 |
| D&M Propertys Inc Limited | Construction | 2023 |
| D&R Lupu Transport Ltd | Construction | 2025 |
| D&S Commercial UK Ltd | Transport & logistics | 2016 |
| D&S Garage PB Ltd | Wholesale & retail | 2023 |
| D&S Transport Solutions Ltd | Transport & logistics | 2025 |
| D'Mur Ltd | Professional & scientific | 2016 |
| D-Lux Cleaning Services Ltd | Administrative & support | 2019 |
| D. Biggs Limited | Financial services | 2016 |
| D. Lynch Services Ltd. | Construction | 2007 |
| D.H.S. Systems Limited | Administrative & support | 1995 |
| D.J Contractors Ltd | Construction | 2023 |
| D.K. Harris Limited | Transport & logistics | 2004 |