| Claire Henley Limited | Arts & recreation | 2002 |
| Clare's Hair & Beauty Limited | Other services | 2002 |
| Classic & Prototype Panels Limited | Manufacturing | 2007 |
| Classics Hair & Beauty Limited | Other services | 1996 |
| Clavesar Limited | Information & communication | 2003 |
| Claydon Horse Exercisers Limited | Agriculture & fishing | 1999 |
| Claydon Limited | Agriculture & fishing | 2005 |
| Claytex Services Limited | Information & communication | 1998 |
| Cleavers Removals Ltd | Transport & logistics | 2014 |
| Cliffview Properties Limited | Hospitality | 1982 |
| Cloudclevr Holdings Limited | Information & communication | 2022 |
| Cloudclevr Investments Ltd | Information & communication | 2023 |
| Coach House Swim School Limited | Arts & recreation | 2003 |
| Cobham Green Management Company Limited | Households | 2004 |
| Colcanbun Limited | Information & communication | 2005 |
| Coles Construction & Facilitating Services Limited | Construction | 2025 |
| Coleshill Laboratories Limited | Professional & scientific | 1990 |
| Coleshill Aluminium (Swarf) Limited | Wholesale & retail | 1971 |
| Coleshill Van and Truck Ltd | Wholesale & retail | 2025 |
| Colmit Design and Construction Limited | | 1979 |
| Cologne & Cotton Limited | Wholesale & retail | 1989 |
| Comis Group Limited | Hospitality | 1993 |
| Compton Lane Nurseries | | 1990 |
| Connollys Tapas Bar Limited | Hospitality | 2007 |
| Consulting Lines Ltd | Professional & scientific | 2006 |
| Cooper Adams Limited | Professional & scientific | 1999 |
| Coral Electrical Services Limited | Construction | 2006 |
| Core Viewpoint Limited | Information & communication | 2002 |
| Coton Legal Ltd | Professional & scientific | 2006 |
| Cotswold Windows & Doors Ltd | Construction | 2025 |
| Coupland Bell Limited | Professional & scientific | 1997 |
| Courageous Success Limited | Information & communication | 2003 |
| Coventry Acupuncture Limited | Health & social care | 2007 |
| Crabb Curtis Property Services Limited | Real estate | 1982 |
| Creative Touch Design Limited | Professional & scientific | 1987 |
| Critique Limited | Professional & scientific | 2003 |
| Crucian Limited | Real estate | 2003 |
| Crystal Accounting Solutions Limited | Professional & scientific | 1998 |
| CSX Advertising Ltd | Information & communication | 2025 |
| Curry MAX Ltd | Hospitality | 2020 |
| Custom Chrome Limited | Manufacturing | 1979 |
| CV R&D LLP | | 2007 |
| Cyril Clifton Limited | Professional & scientific | 2002 |
| D & L Plant (Campden) Limited | Construction | 1992 |
| D C Flooring Limited | Construction | 2003 |
| D C Leake Limited | Wholesale & retail | 1952 |
| D E Q Interiors Limited | Construction | 2002 |
| D. Walker Limited | Wholesale & retail | 2005 |
| D. Wilson Plant Hire Limited | Construction | 2005 |
| D.C.M. Drillquip Limited | Manufacturing | 1994 |
| D.F.J. Hewer Limited | Real estate | 1979 |
| Daisykins Limited | Education | 2002 |
| Daniel Bedson Services Limited | Construction | 2004 |
| Dare Group Ltd | Manufacturing | 2017 |
| Dark Lane Freehold Management Company Limited | Real estate | 2005 |
| Datchet Securities (NO. 23) | | 1979 |
| David Emsley Limited | Information & communication | 1987 |
| David FOY Sales & Marketing Limited | Wholesale & retail | 2003 |
| Davies Industrial & Welding Supplies Ltd | Wholesale & retail | 2007 |
| Dbsr Travels Ltd | Administrative & support | 2007 |
| DCA Design International Limited | Professional & scientific | 1986 |
| Dean Chater Haulage Limited | Transport & logistics | 2002 |
| Deanoworld Limited | | 1986 |
| Dearnsdale Fruit | Agriculture & fishing | 2004 |
| Definition Media Limited | Administrative & support | 2007 |
| Delstree Limited | Information & communication | 2006 |
| Deman Systems Limited | Information & communication | 1998 |
| Designers Choice Upholstery Limited | Water & waste | 1984 |
| Devo Engineering Limited | Information & communication | 2002 |
| Devonstar Properties Limited | | 1982 |
| Dhiraj Solutions Limited | Information & communication | 2007 |
| Digital Namespace Limited | Information & communication | 2006 |
| Dinora Developments Ltd | Construction | 2017 |
| Direct Premium Finance Limited | Financial services | 2003 |
| Divarex Limited | Real estate | 2003 |
| Divine Imports Limited | Wholesale & retail | 2024 |
| DJH Consulting Limited | Other services | 1999 |
| DKB Solutions Limited | Information & communication | 2004 |
| DNA Property Developments Limited | Construction | 2002 |
| Dobergo UK Limited | Wholesale & retail | 2005 |
| Dojo Community Project | Other services | 2004 |
| Dovecote Care at Home Ltd | Administrative & support | 2022 |
| DP Concepts Limited | Information & communication | 2007 |
| Drains ARE US Limited | Construction | 1998 |
| DSM Limited | Professional & scientific | 2007 |
| DUE North Consultancy Limited | Professional & scientific | 2024 |
| Dunmore East Limited | Professional & scientific | 2004 |
| Dunsmore Investments Limited | Professional & scientific | 2003 |
| Durkopp Adler (UK) Limited | Transport & logistics | 1983 |
| E & H Tubes Limited | Manufacturing | 1978 |
| Eastaugh Ltd | Information & communication | 2014 |
| Easy Parking Solutions Limited | Real estate | 2000 |
| Edwards, Pearson & White LLP | | 2004 |
| Elevex Stages Limited | Professional & scientific | 2025 |
| Elizabeth Ayers Bridalwear Limited | Manufacturing | 2003 |
| Elmpark Consultancy Services Ltd | Professional & scientific | 2007 |
| Emmerson Press Limited | Manufacturing | 1981 |
| Energized Ltd | Construction | 2005 |
| Engineering GB Ltd | Professional & scientific | 2003 |
| EP Claris Propco LLP | | 2026 |