| Ccfd (Hull) Limited | Professional & scientific | 2003 |
| CDY 2021 Ltd | Financial services | 2021 |
| CDY Ceilings & Partitions Limited | Construction | 2003 |
| Centurion Place Management Company Limited | Households | 2006 |
| Chaingate Limited | Professional & scientific | 1978 |
| Chamber Acorn Fund (Humber) Ltd | Administrative & support | 2004 |
| Chamber Property (Humber) Ltd | Administrative & support | 1993 |
| Chempro Engineering Solutions Ltd | Professional & scientific | 2023 |
| Cherrys Country Hardware Limited | Wholesale & retail | 2004 |
| Chris Wright & Co. Limited | Professional & scientific | 2003 |
| Clark Weightman Limited | Professional & scientific | 1999 |
| Classic Interiors (East Yorkshire) Limited | Wholesale & retail | 1990 |
| Clear Interior Projects Ltd | Construction | 2015 |
| Clenham Limited | Extraterritorial | 1976 |
| Cleveland Car Sales Limited | Wholesale & retail | 2001 |
| Cliffe House Nursery School | Education | 2004 |
| Clifford Engineering (Hull) Limited | Professional & scientific | 2006 |
| Clothes for Little People Limited | Wholesale & retail | 2003 |
| Clucas Diving & Marine Engineering Limited | Manufacturing | 1998 |
| Coletta and Tyson Retail Limited | Wholesale & retail | 2006 |
| Comm Services Limited | Extraterritorial | 1999 |
| Complete Coatings (UK) Limited | Wholesale & retail | 2002 |
| Complete Drylining Limited | Construction | 2002 |
| Coolspec Limited | Professional & scientific | 2006 |
| Cooper Electrical Services (Northern) Limited | Construction | 2000 |
| Core Electrical Services Limited | Manufacturing | 2002 |
| Corner Groundworks & Plant Limited | Construction | 1999 |
| Cosford House Limited | Health & social care | 1998 |
| Cottingham (King Street) Holdings Limited | Households | 1975 |
| Cottingham MOT Centre Ltd | Wholesale & retail | 2003 |
| CRF Storage (Brantingham) Limited | Transport & logistics | 2001 |
| Croda Application Chemicals Limited | Professional & scientific | 1896 |
| Croda Bowmans Chemicals Limited | Professional & scientific | 1905 |
| Croda CE Limited | Professional & scientific | 1899 |
| Croda Cosmetics (Europe) Limited | Professional & scientific | 1987 |
| Croda Enterprises Limited | Professional & scientific | 2005 |
| Croda Europe Limited | Manufacturing | 1920 |
| Croda Food Services Limited | Professional & scientific | 1964 |
| Croda Foundation | Health & social care | 2020 |
| Croda Polymers International Limited | Professional & scientific | 1946 |
| Croda World Traders Limited | Professional & scientific | 1919 |
| Cuando Limited | Information & communication | 2002 |
| D & D Taylor Engineering Limited | Construction | 2002 |
| D.A. Giles (Electrical) Limited | Construction | 1998 |
| D.L. Barr & Sons Limited | Other services | 2002 |
| Daco Solutions Limited | Manufacturing | 2001 |
| Daifuku Airport UK Ltd. | Manufacturing | 1995 |
| Daimler & Lanchester Limited | Extraterritorial | 2005 |
| Dale Leisure Supplies Limited | Manufacturing | 2002 |
| Dalton Spire Limited | Manufacturing | 2006 |
| Damac Bulk Handling Limited | Transport & logistics | 1986 |
| Damac Transporters Ltd | Transport & logistics | 1976 |
| Data Capture & Apply Technology Limited | Information & communication | 2003 |
| Dave Rogers Construction Consultancy Limited | Administrative & support | 2007 |
| David Woodcock Limited | Agriculture & fishing | 2011 |
| Daynes (Melton) Limited | Administrative & support | 2007 |
| Dchem Limited | Professional & scientific | 1990 |
| Dean's Tugs & Workboats Limited | Transport & logistics | 1996 |
| Deans Marine Services Ltd | Transport & logistics | 2007 |
| Deep Developments Limited | Construction | 1998 |
| Delta Caravans Holdings Limited | Manufacturing | 2003 |
| Delta Caravans International Limited | Manufacturing | 2000 |
| Delta Caravans Limited | Manufacturing | 1993 |
| Delta Insulation Services Limited | Construction | 2003 |
| Dencap Limited | Health & social care | 2005 |
| Denman Instrumentation Limited | Construction | 1995 |
| Designs on YOU Limited | Other services | 2004 |
| Desmond House Limited | Health & social care | 2003 |
| Dewhirst Holdco Limited | Professional & scientific | 2024 |
| Discernment Limited | Professional & scientific | 2005 |
| Dobson Cleaning Services Limited | Administrative & support | 2006 |
| Document Management Consultants Limited | Information & communication | 1998 |
| Domizar Limited | Professional & scientific | 2005 |
| Double "C" Hire & Repair Limited | Administrative & support | 2003 |
| Doug Jennings (Town Planning) Limited | Professional & scientific | 2003 |
| Dove House Trading Limited | Wholesale & retail | 1995 |
| Driven Sporting Limited | Wholesale & retail | 2020 |
| Duesbury Court (Beverley) Management Limited | Households | 2004 |
| E C Professionals Limited | Professional & scientific | 2003 |
| E W Higgins & SON Limited | Financial services | 2007 |
| E&D Homes Limited | Professional & scientific | 2005 |
| E. Batty (Contractors) Limited | Manufacturing | 1956 |
| East Coast Pest Control Limited | Professional & scientific | 2003 |
| East Hull Cars Limited | Transport & logistics | 2006 |
| East Riding Event Furniture Hire Limited | Administrative & support | 2002 |
| East Riding Properties Ltd | Real estate | 2002 |
| East Riding Wholesalers Limited | Wholesale & retail | 1996 |
| East Yorkshire Concrete Products Limited | Administrative & support | 2003 |
| East Yorkshire Print Services Limited | Manufacturing | 2003 |
| Eastfield Residential Home Limited | Health & social care | 1998 |
| Easyselfstore Ltd | Transport & logistics | 2007 |
| Eddie Beedle Limited | Manufacturing | 2001 |
| EGE Properties Holdings Limited | Financial services | 2025 |
| Elite Marketing Limited | Extraterritorial | 1915 |
| Elite Office Furniture (UK) Ltd. | Manufacturing | 1997 |
| Elizabeth Jayne Limited | Wholesale & retail | 2002 |
| Elleteq Limited | Water & waste | 1996 |
| EMF Plumbing and Heating Limited | Construction | 2008 |
| Emih Limited | Real estate | 1998 |
| Energy Assessors Limited | Professional & scientific | 2007 |