| Commercial Development Projects Limited | Construction | 1970 |
| Communic-A New Renaissance Limited | Professional & scientific | 2002 |
| Compact Software Limited | Information & communication | 1997 |
| Compass Renovation Limited | Construction | 2003 |
| Compliance Inspection Services Limited | Professional & scientific | 2003 |
| Concept Design Realisations Limited | Information & communication | 2006 |
| Concept Learning Limited | Information & communication | 1998 |
| Concept Management Limited | Professional & scientific | 1998 |
| Connelly & Co. Limited | Professional & scientific | 2003 |
| Contactlife Limited | Information & communication | 2001 |
| Contract Furniture Solutions Limited | Manufacturing | 2005 |
| Controline Limited | Manufacturing | 2003 |
| Convenience Distribution Group Limited | Other services | 1996 |
| Cookware Limited | Wholesale & retail | 2025 |
| Cool BED Limited | Wholesale & retail | 2019 |
| Coopers Contract Cleaning Limited | Administrative & support | 2005 |
| Coopers Financial Services Limited | Real estate | 2006 |
| Copley Flats Limited | Households | 1980 |
| Corcoran Gibbons Structural Consultants Limited | Professional & scientific | 2001 |
| Core IT Services Limited | Information & communication | 2006 |
| Coriant UK Limited | Information & communication | 1978 |
| Cornfields Day Nursery Limited | Education | 2007 |
| Corporate & Sporting Events Management Limited | Administrative & support | 2000 |
| Corropages Limited | Extraterritorial | 2000 |
| Country Style Foods Limited | Manufacturing | 1990 |
| Countrywide Fridge Collection Services Limited | Information & communication | 2004 |
| COX Automotive GEO Limited | Professional & scientific | 2022 |
| CR & G Stephenson Limited | Agriculture & fishing | 2004 |
| Craft UK Limited | Manufacturing | 2007 |
| Crantock Developments Limited | Construction | 2004 |
| Crestpond Limited | Construction | 2010 |
| Crimewatch Protection Limited | Construction | 1997 |
| Cross - Forth Limited | Real estate | 1961 |
| Crown Estate Agents Limited | Real estate | 1993 |
| Cryer & Stott Cheesemongers Limited | Hospitality | 2002 |
| Crypto Peerless Limited | Manufacturing | 1996 |
| Crystalstaro Partners Ltd | Wholesale & retail | 2025 |
| CSP Network Ltd | Real estate | 2025 |
| Cummins and Papyrus Limited | Manufacturing | 1980 |
| Cummins Turbo Technologies Limited | Extraterritorial | 1952 |
| Custometal Products Limited | Manufacturing | 1982 |
| CV8 Tennis CIC | Education | 2024 |
| D & H Wooller Limited | Real estate | 1992 |
| D & J Taylor Limited | Extraterritorial | 1998 |
| D & K Joinery Limited | Construction | 2008 |
| D & M Jordan Limited | Other services | 2004 |
| D B Commercial Finance Limited | Financial services | 2007 |
| D B Dental Equipment Limited | Professional & scientific | 1999 |
| D Barrett Skip Hire Limited | Administrative & support | 2005 |
| D Croft & SON Limited | Construction | 2003 |
| D H Transport & Sons Limited | Transport & logistics | 2003 |
| D Hubbard Electrical Limited | Construction | 2005 |
| D L K Fabrications Limited | Manufacturing | 2002 |
| D Mitchell Sales Limited | Wholesale & retail | 2004 |
| D. Benson (Controls) Limited | Manufacturing | 1966 |
| D. R. Welding Limited | Manufacturing | 2006 |
| D. Rayner & SON Limited | Other services | 2003 |
| D.B. Plant Services Limited | Construction | 2007 |
| D.L. Drinks Limited | Wholesale & retail | 1995 |
| D.M.F. (Wakefield) Limited | Manufacturing | 1976 |
| D.M.Keith (Wakefield) Ltd | Wholesale & retail | 1972 |
| Daak Ltd | Manufacturing | 2006 |
| Dacre, SON & Hartley Limited | Real estate | 1995 |
| Dadibhais (Bradford) Limited | Wholesale & retail | 1990 |
| Dahlak Entertainment Centre Ltd | Hospitality | 2014 |
| Daily News Limited | Wholesale & retail | 2004 |
| Dakota Hospitality Limited | Hospitality | 2014 |
| Dandelion Developments Limited | Professional & scientific | 2004 |
| Danny Stead Limited | Real estate | 2004 |
| Danoil Lubricants Limited | Wholesale & retail | 1996 |
| Dantex Group Limited | Professional & scientific | 2006 |
| Daresbury Park Developments Limited | Real estate | 2000 |
| Daresbury Park Management Company Limited | Real estate | 1999 |
| Dargai Medics Ltd | Health & social care | 2024 |
| Data Management Services (Yorkshire) Ltd | Professional & scientific | 2005 |
| David Bagg Limited | Construction | 2007 |
| David Brunskill Properties Limited | Real estate | 2004 |
| David Comyn Limited | Other services | 2007 |
| David GEE Associates Limited | Real estate | 1997 |
| David Jones Accountants Limited | Professional & scientific | 2007 |
| David Lishman Limited | Manufacturing | 1997 |
| Davies & Co. (Environmental) Limited | Professional & scientific | 1962 |
| Davis & Davis Plant Hire Limited | Real estate | 1970 |
| Davison & Robinson Limited | Wholesale & retail | 1999 |
| DB Electrical Wholesale (UK) Ltd | Wholesale & retail | 2006 |
| DB Orthodontics Limited | Health & social care | 1971 |
| Dcsw Ltd | Professional & scientific | 2015 |
| DCV Property LLP | | 2005 |
| DE Lacy Motor Club Limited | Arts & recreation | 1975 |
| DEL SOL Holdings Limited | Professional & scientific | 2007 |
| Delta Park Developments Limited | Real estate | 2000 |
| Denara Holdings Limited | Financial services | 2003 |
| Dencroft Garages Limited | Manufacturing | 1981 |
| Dene Butterfield Limited | Administrative & support | 2007 |
| Denley Hydraulics Limited | Manufacturing | 2000 |
| Dental Care Centre Limited | Health & social care | 2007 |
| Derma Revive Limited | Health & social care | 2007 |
| Desertrose Limited | Wholesale & retail | 2000 |
| Design Management Contracting Limited | Professional & scientific | 1979 |
| Design Powered Ltd | Administrative & support | 2012 |