| Custodian Solutions Ltd | Information & communication | 2013 |
| Custom Club Gear Ltd | Wholesale & retail | 2025 |
| Custom Paintworx Ltd | Wholesale & retail | 2022 |
| Custom Range Services Ltd | Professional & scientific | 2022 |
| Customer Plus Limited | Professional & scientific | 2018 |
| Customer Satisfaction UK Limited | Professional & scientific | 2019 |
| Customised Building Solutions Limited | Construction | 2026 |
| CUT and Vape Limited | Wholesale & retail | 2018 |
| Cutbook Ltd | Administrative & support | 2022 |
| Cutte Innovations Ltd | Professional & scientific | 2022 |
| Cutte Trading Platform Ltd | Professional & scientific | 2020 |
| Cutting Hedge Gardening Services Derby Limited | Administrative & support | 2013 |
| CVS Planet Limited | Wholesale & retail | 2023 |
| CVT Derby Ltd | Wholesale & retail | 2018 |
| CW Construction (Midlands) Ltd | Construction | 2025 |
| Cwmorthin Slate Quarry 1994 Company Limited | Extraterritorial | 1994 |
| CWS Financial Limited | Professional & scientific | 2019 |
| CWS5 Ltd | Hospitality | 2024 |
| Cwt-Y-Bugail Slate Quarries,Limited(The) | Extraterritorial | 1923 |
| CX Ninjas Ltd | Information & communication | 2022 |
| Cyan (Eco) Ltd | Agriculture & fishing | 2021 |
| Cyan Management Company Limited | Real estate | 2008 |
| Cyan Skies Ltd | Real estate | 2021 |
| Cybearnet Software Limited | Information & communication | 2025 |
| Cyber Cert UK Ltd | Information & communication | 2016 |
| Cyber Katana Limited | Information & communication | 2023 |
| Cyber Spartans Limited | Information & communication | 2021 |
| Cygnet Cyber Ltd | Information & communication | 2022 |
| Cygnet Information Projects Ltd | Information & communication | 2012 |
| Cygnus Court Management Company Limited | Professional & scientific | 2005 |
| Cygnus Edutours Limited | Administrative & support | 2023 |
| CYK Holdings Ltd | Financial services | 2021 |
| CYK Ltd | Professional & scientific | 2019 |
| Cyllene Associates Limited | Administrative & support | 2014 |
| CYQ Property Ltd | Real estate | 2023 |
| Cyrus Carhire Ltd | Transport & logistics | 2024 |
| D & D Associates Ltd | Real estate | 2022 |
| D & H Properties (East Midlands) Limited | Real estate | 2007 |
| D & I Civils Limited | Construction | 2024 |
| D & M Groundworks Limited | Construction | 2014 |
| D & M Resins Limited | Construction | 2020 |
| D & R Solutions Limited | Professional & scientific | 2012 |
| D & S Optical Ltd | Wholesale & retail | 2026 |
| D & T W Services Ltd | Information & communication | 2018 |
| D a Hall Trading Limited | Hospitality | 2000 |
| D and S Restaurants Ltd | Hospitality | 2020 |
| D Bayliss Consulting Limited | Professional & scientific | 2002 |
| D D T Property Investments Limited | Real estate | 2022 |
| D Doman Civils Ltd | Construction | 2026 |
| D Fitzhughs Ltd | Construction | 2018 |
| D H C Heating Limited | Manufacturing | 2013 |
| D H Engineering (Derby) Ltd | Manufacturing | 2010 |
| D Hallett Limited | Manufacturing | 2017 |
| D Harvey Media Ltd | Information & communication | 2024 |
| D Healthy Lifestyle Limited | Households | 2019 |
| D J Coleman Construction Ltd | Construction | 2018 |
| D K International (UK) Limited | Wholesale & retail | 2013 |
| D Khunkhuna Limited | Financial services | 2021 |
| D L Security Ltd | Administrative & support | 2001 |
| D M Lock Limited | Professional & scientific | 2005 |
| D Mann Engineering Services Ltd | Professional & scientific | 2025 |
| D Mcdonald Site Services Limited | Construction | 2023 |
| D Merry Roof Tiling & Slating Ltd | Construction | 2003 |
| D P Morrow Services Ltd | Manufacturing | 2015 |
| D R K Holdings Limited | Real estate | 2018 |
| D S Colchester (Properties) Limited | Real estate | 2019 |
| D S Lounge Ltd | Hospitality | 2025 |
| D Simmonds Consulting Ltd | Information & communication | 2026 |
| D Square Studio Ltd | Professional & scientific | 2024 |
| D Street Properties Ltd | Construction | 2013 |
| D V Estates Limited | Real estate | 2006 |
| D Ward Property Solutions Limited | Construction | 2023 |
| D Wright Electrical Services Ltd | Wholesale & retail | 2008 |
| D&B Contractors Ltd | Construction | 2016 |
| D&B Loft Conversions Ltd | Construction | 2026 |
| D&D Business Consulting Limited | Information & communication | 2025 |
| D&E Holdings Limited | Financial services | 2020 |
| D&F Transport Ltd | Transport & logistics | 2026 |
| D&G Capital Ltd | Real estate | 2024 |
| D&H Properties and Investment Limited | Real estate | 2021 |
| D&K Property Group Holdings Limited | Financial services | 2025 |
| D&K Property Group Limited | Households | 2025 |
| D&K Wong Ltd | Financial services | 2021 |
| D&Kh Ltd | Other services | 2025 |
| D&O Property Management Services Ltd | Households | 2025 |
| D&R Humphries Limited | Financial services | 2026 |
| D&S Robinson Holdings Limited | Financial services | 2025 |
| D&Z Property Solutions Ltd | Construction | 2025 |
| D-Shahwar Limited | Administrative & support | 2019 |
| D-Squared Health and Safety Ltd | Professional & scientific | 2025 |
| D. & K. Bennett Limited | Wholesale & retail | 2016 |
| D. & M. International Transport Limited | | 1994 |
| D.A.I. Driveways & Landscaping Limited | Administrative & support | 2003 |
| D.A.R.R.K Property Ltd | Real estate | 2025 |
| D.A.T 24/7 Ltd | Wholesale & retail | 2025 |
| D.A.V Productions Ltd | Information & communication | 2020 |
| D.D Brickwork Specialists Limited | Construction | 2005 |
| D.E Network Ltd | Construction | 2025 |
| D.G. Controls Limited | Manufacturing | 1967 |
| D.I.P.T. Holdings Limited | Professional & scientific | 2005 |