| Curtis Robb Ltd | Health & social care | 2018 |
| Curzn Alloys Limited | Water & waste | 1997 |
| Curzonscm Ltd | Administrative & support | 2019 |
| Custom Fabrications International Ltd | Manufacturing | 2020 |
| Custom Filled Aerosols Ltd | Wholesale & retail | 2026 |
| Custom Machine and Grinding Limited | Administrative & support | 2010 |
| Custom Made Home Design Ltd | Manufacturing | 2018 |
| Custom Wood Products Limited | Manufacturing | 2017 |
| Customate Europe Limited | Manufacturing | 2015 |
| Customer 1ST Logistics Ltd | Transport & logistics | 2023 |
| CUT the Mustard (Holdings) Limited | Information & communication | 2003 |
| Cuttdifferent Ltd | Wholesale & retail | 2024 |
| Cvousden Ltd | Other services | 2026 |
| Cyber Eaze Solutions Ltd | Information & communication | 2025 |
| Cyberians Group Limited | Information & communication | 2024 |
| Cybernautix Limited | Professional & scientific | 2008 |
| Cybersekure Ltd | Information & communication | 2017 |
| Cygnus Consultancy Ltd | Professional & scientific | 2020 |
| Cyl-Press Limited | | 1980 |
| Cynart Properties Ltd | Real estate | 2025 |
| Cynarth Enterprise Ltd | Professional & scientific | 2022 |
| Cyples Limited | Administrative & support | 2015 |
| Cyrus Haulage Ltd | Transport & logistics | 2026 |
| Cyrus the Great Ltd | Wholesale & retail | 2024 |
| Cytex Chemicals Ltd | Manufacturing | 1987 |
| D & S Brassington Meats Ltd | Wholesale & retail | 2017 |
| D & a Rhead Transport Limited | Transport & logistics | 2008 |
| D & B Cleaning Services Ltd | Administrative & support | 2017 |
| D & D Group Holdings Limited | Financial services | 2022 |
| D & G BUS Limited | Transport & logistics | 2009 |
| D & J Moseley Limited | Agriculture & fishing | 2015 |
| D & K Bourne Limited | Construction | 2014 |
| D & L Builders (Stoke) Ltd | Construction | 2021 |
| D & L Food and Wine Ltd | Wholesale & retail | 2022 |
| D & M Goods Ltd | Wholesale & retail | 2026 |
| D & S Brassington Limited | Real estate | 2006 |
| D a C (UK) Ltd | Professional & scientific | 2004 |
| D and L Jarvie Consultancy Limited | Professional & scientific | 2014 |
| D and R Skilton Limited | Real estate | 2024 |
| D B Alarms Ltd | Construction | 2022 |
| D B G Consulting Limited | Administrative & support | 2018 |
| D B Plumbing and Heating Limited | Construction | 2007 |
| D Baddeley Electrical & Fire Ltd | Construction | 2007 |
| D Bains Properties Limited | Real estate | 2012 |
| D Bickerton Ltd | Construction | 2016 |
| D Emery Plant Hire Ltd | Administrative & support | 2021 |
| D F Property Developments Limited | Construction | 2015 |
| D Heap Plant Hire Ltd | Administrative & support | 2010 |
| D J B Installation Services Limited | Construction | 2018 |
| D J Property Developers Ltd | Real estate | 2013 |
| D K Logistics Limited | Transport & logistics | 2002 |
| D K Specialist Logistics Limited | Extraterritorial | 2017 |
| D MAX Maintenance Ltd | Wholesale & retail | 2025 |
| D N Capper Plastering Limited | Construction | 2004 |
| D O S Transport Limited | Transport & logistics | 2015 |
| D Price Group Ltd | Construction | 2021 |
| D W Harrison Electrical Limited | Construction | 2018 |
| D W P & Sons Limited | Transport & logistics | 2013 |
| D Wardle Brickwork Ltd | Construction | 2024 |
| D&A Coffee Limited | Hospitality | 2025 |
| D&A Essentials Ltd | Wholesale & retail | 2026 |
| D&A Solutions Ltd | Transport & logistics | 2014 |
| D&B Services Ltd | Construction | 2025 |
| D&L Woolliscroft Limited | Construction | 2019 |
| D&M Carpentry and Joinery (Staffordshire) Ltd | Construction | 2022 |
| D&N Drainage & Groundwork Ltd | Construction | 2018 |
| D&P Security Solutions Ltd | Administrative & support | 2014 |
| D&S Autos Ltd | Wholesale & retail | 2019 |
| D&S Perfect Finish Ltd | Construction | 2025 |
| D&V Logistics & Trading Ltd | Wholesale & retail | 2025 |
| D&Z Installation Services Limited | Construction | 2020 |
| D'Signs & Graphix Ltd | Manufacturing | 2006 |
| D-Fabs Ltd | Manufacturing | 2016 |
| D-Sebastian Ionita Ltd | Wholesale & retail | 2023 |
| D. & G. Builders (Stoke) Limited | Construction | 1981 |
| D.A. PAK Holdings Limited | Financial services | 2021 |
| D.A. PAK Limited | Administrative & support | 1998 |
| D.B.C Sales Limited | Wholesale & retail | 2015 |
| D.B.N 01 Ltd | Transport & logistics | 2023 |
| D.C. Car Repairs Limited | Wholesale & retail | 2002 |
| D.C.H Catering Limited | Hospitality | 2026 |
| D.D. Wright Transport Services Ltd | Transport & logistics | 2007 |
| D.D.C Medical Services Ltd | Professional & scientific | 2025 |
| D.E.C Group Holdings Limited | Financial services | 2025 |
| D.J. Auto Electrical Limited | Wholesale & retail | 1996 |
| D.J.Davies Ltd | Wholesale & retail | 2020 |
| D.M.K. Installations Limited | Construction | 2018 |
| D.P. Transport Ltd | Manufacturing | 2016 |
| D.R Plant Hire Ltd | Administrative & support | 2022 |
| D.R. Collins Limited | Real estate | 1990 |
| D.R.C Contracting Ltd | Professional & scientific | 2019 |
| D.W.M Plastering & Damp Specialists Ltd | Construction | 2020 |
| D20-ONE Property Ltd | Real estate | 2026 |
| D20-ONE Structural Design Ltd | Professional & scientific | 2023 |
| D2D Electrical Solutions Ltd | Construction | 2025 |
| DA & LM Developments Limited | Real estate | 2025 |
| DA Nova Travel Limited | Administrative & support | 2022 |
| DA Windows, Doors, Conservatories Ltd | Construction | 2023 |
| Daas Construction Ltd | Construction | 2014 |
| Daata Limited | Information & communication | 2024 |