| Craig & Paul Management Limited | Real estate | 2020 |
| Cranham Village Bakery Limited | Wholesale & retail | 2009 |
| Crazy Frog Transport Ltd | Transport & logistics | 2021 |
| CRB Topco Limited | Financial services | 2025 |
| CRC Maldon Ltd | Construction | 2026 |
| CRE8 Scaffolding Limited | Construction | 2018 |
| Creative Hairstyle LU Limited | Other services | 2024 |
| Creative Squirrel Limited | Information & communication | 2017 |
| Crescent Cards Ltd | Wholesale & retail | 2026 |
| Croatian Language School Limited | Professional & scientific | 2010 |
| Cromwell Hall (Maldon) Limited | Education | 2015 |
| Cromwell House Property Limited | Financial services | 2026 |
| Cromwell Lakes Development Limited | Construction | 2019 |
| Crown Tree Services Limited | Agriculture & fishing | 2013 |
| Crownstone Decorators Limited | Construction | 2018 |
| CRS Marine Ltd. | Manufacturing | 2000 |
| Crystal Heaven Ltd | Extraterritorial | 2011 |
| Crystal Shack Ltd | Wholesale & retail | 2022 |
| CT (East) Holdings Ltd | Real estate | 2018 |
| CT (East) Limited | Real estate | 2005 |
| Culture Construction Ltd. | Construction | 2017 |
| Cuppa COS Ltd | Hospitality | 2025 |
| Curtis O'Boyle Lettings Ltd | Real estate | 2012 |
| Curtis O'Boyle(Maldon) Ltd | Real estate | 2012 |
| Customised Business Programmes Ltd | Other services | 2009 |
| Cute Cuts Grooming Ltd | Administrative & support | 2014 |
| Cute Dog Consulting Ltd | Education | 2005 |
| CV Finance Limited | Financial services | 2001 |
| CVI Solutions Limited | Information & communication | 2011 |
| CVP Engineering Limited | Professional & scientific | 2021 |
| CW London Limited | Real estate | 2019 |
| CYC Holdings Ltd | Financial services | 2025 |
| Cypress Moon Solutions Ltd | Professional & scientific | 2021 |
| D & a Construction (Essex) Limited | Construction | 2020 |
| D & D Engineering Ltd | Manufacturing | 2005 |
| D & H Management Services Limited | Construction | 2024 |
| D & S Legal Limited | Professional & scientific | 2015 |
| D G a Surfacing Ltd | Construction | 2022 |
| D J French Limited | Construction | 2006 |
| D M Dixon & SON Limited | Construction | 1972 |
| D Thurston Networks Limited | Construction | 2002 |
| D W Clark & Sons Holdings Limited | Financial services | 2022 |
| D W Clark & Sons Limited | Transport & logistics | 1984 |
| D&S Haulage (Aylesford) Limited | Transport & logistics | 2018 |
| D'Arcy Court (Maldon) Freehold Limited | Real estate | 2009 |
| D'Arcy Court (Maldon) Management Company Limited | Households | 2006 |
| D'Arcy Equestrian Limited | Arts & recreation | 1995 |
| D'Arcy Furniture Limited | Manufacturing | 2011 |
| D. a. Ashcroft & SON Limited | Agriculture & fishing | 2013 |
| D. E. Robinson Landscapes Limited | Administrative & support | 2018 |
| D.A. Rudd Limited | Construction | 2001 |
| D.B.N & Sons Ltd | Transport & logistics | 2016 |
| D.C. Electronics Motorsport Specialist Limited | Manufacturing | 1998 |
| D.S.P Window Opening Controls Ltd | Manufacturing | 2018 |
| D2BW Bestwick Limited | Information & communication | 2022 |
| D4G Consultancy Limited | Information & communication | 2013 |
| Dada Enterprises Limited | Other services | 2009 |
| Daisy Automation Ltd | Information & communication | 2025 |
| Damo's Locks Ltd | Other services | 2023 |
| Daniel Robert Hurd Limited | Construction | 2023 |
| Danny Hyams Ltd | Wholesale & retail | 2013 |
| Dantherm Group Limited | Manufacturing | 1994 |
| Danvia Travel Ltd | Transport & logistics | 2020 |
| Dan’S Detailing UK Ltd | Extraterritorial | 2025 |
| Darling Cars Limited | Professional & scientific | 2011 |
| Data Vista Ltd | Professional & scientific | 2023 |
| Datacoms System Solutions Limited | Construction | 2019 |
| Datum Garden Design Limited | Administrative & support | 2015 |
| David Lamb (UK) Limited | Professional & scientific | 2014 |
| David Morris Ltd | Wholesale & retail | 2018 |
| David Turner Installations Ltd | Manufacturing | 2008 |
| Day Two VFX Ltd | Information & communication | 2023 |
| Dayv Business Support Ltd | Professional & scientific | 2019 |
| DB Sealants Ltd | Construction | 2023 |
| Dborhas Well Limited | Information & communication | 2013 |
| DCB Brickwork Limited | Construction | 2025 |
| DCH Travel Ltd | Transport & logistics | 2022 |
| DD Online Ltd | Hospitality | 2025 |
| DDG Construction Services Ltd | Construction | 2019 |
| Deal Foods Limited | Hospitality | 2005 |
| Dean Tobin Limited | Wholesale & retail | 2013 |
| Deange Limited | Wholesale & retail | 2018 |
| Debut Residents Management Company Limited | Households | 2004 |
| Debway Transport Ltd | Transport & logistics | 2019 |
| Decidevision Limited | Manufacturing | 1996 |
| Decor Painting Contractors Limited | Construction | 2002 |
| Dedman Developments Ltd | Real estate | 2024 |
| Dekology Limited | Construction | 2023 |
| Deli and Fizz Limited | Hospitality | 2022 |
| Dellar Property Ltd | Real estate | 2014 |
| Dellwood Homes (Bury) Limited | Construction | 2017 |
| Dellwood Homes Limited | Construction | 2015 |
| Delph Solutions 2020 Limited | Extraterritorial | 2008 |
| Deltacom Managed Services Ltd | Information & communication | 2023 |
| DEM Foils Limited | Manufacturing | 2008 |
| Demirci Property Ltd | Real estate | 2021 |
| DEN to MAR Ltd | Hospitality | 2025 |
| Dengie Scaffolding Ltd | Construction | 2018 |
| Dengie Waste Management Limited | Water & waste | 2022 |
| Deniz OZ Limited | Other services | 2013 |