| Crouch Valley Performance Ltd | Professional & scientific | 2026 |
| Crouch Valley Property Ltd | Extraterritorial | 2026 |
| Crownhunter Ltd | Information & communication | 2023 |
| Crowstone Complementary Clinic Limited | Health & social care | 2017 |
| Crundale Farms Limited | Extraterritorial | 2011 |
| Crystal Lead Limited | Health & social care | 2013 |
| CSG Contractors Ltd | Construction | 2026 |
| CT Climate Solutions Limited | Construction | 2010 |
| CTL Holdings Limited | Professional & scientific | 2008 |
| CTL Medical (UK) Limited | Manufacturing | 2001 |
| CTR Properties Limited | Real estate | 2017 |
| Ctzn Supplies Ltd | Wholesale & retail | 2025 |
| CUE the Change Ltd | Administrative & support | 2023 |
| Culldan Property Management Limited | Real estate | 2019 |
| Cummins Consultancy Ltd | Professional & scientific | 2019 |
| Cunning Thermal Limited | Construction | 1999 |
| Curry Mahal Hove Ltd | Hospitality | 2016 |
| Custom Home Automations Ltd | Construction | 2018 |
| Customshub Ltd | Wholesale & retail | 2021 |
| Cut-Inn Limited | Other services | 2013 |
| CW & IW Engineering Ltd | Other services | 2019 |
| Cycool Ltd | Manufacturing | 2020 |
| Cysterapp Ltd | Health & social care | 2025 |
| D & G Carpentry Ltd | Construction | 2014 |
| D & J Franklin Holdings Ltd | Financial services | 2023 |
| D and D Miller Property Investments Ltd | Real estate | 2025 |
| D C Coley Plumbing and Heating Limited | Construction | 2011 |
| D D C Holdings (Essex) Limited | Professional & scientific | 2006 |
| D Gibson Heating Essex Ltd | Administrative & support | 2014 |
| D H Hamilton Limited | Professional & scientific | 2013 |
| D K Hair of Hockley Limited | Other services | 2015 |
| D P Albany Limited | Construction | 2017 |
| D P R Autos Limited | Wholesale & retail | 2023 |
| D Piper Motors Limited | Wholesale & retail | 2002 |
| D Squared Contracts Limited | Construction | 2025 |
| D W Groundworks (Essex) Ltd | Construction | 2008 |
| D&H Property Developments Ltd | Real estate | 2025 |
| D&I Heating Engineers Limited | Construction | 2017 |
| D&I Oakwood Escape Ltd | Real estate | 2022 |
| D&M Steel 2020 Ltd | Other services | 2023 |
| D&N Blom Limited | Real estate | 2016 |
| D&R Landscapes and Tree Surgery Limited | Administrative & support | 2024 |
| D&R Property Rental Ltd | Real estate | 2023 |
| D.B. Marr Limited | Information & communication | 2007 |
| D.C. Donovan Group Limited | Construction | 2003 |
| D.C.D. Group Limited | Construction | 2009 |
| D.C.D. Plant Hire Limited | Administrative & support | 2005 |
| D.D.C. Builders Limited | Construction | 1971 |
| D.F. Miller Construction Limited | Construction | 2001 |
| D.G.K Decorating Ltd | Construction | 2014 |
| D.L.V. UK Limited | Extraterritorial | 2001 |
| D.M.G. Industrial Roofing Limited | Construction | 2007 |
| D.M.R. Heating Limited | Construction | 2002 |
| D.T. Independent Foods Limited | Wholesale & retail | 2014 |
| D.T. Tiling Limited | Construction | 2002 |
| DA Silva Prime Developments Ltd | Construction | 2025 |
| DA Waywise Ltd | Construction | 2024 |
| Daedalus Servicing Ltd | Other services | 2025 |
| Dahlen House Ltd | Arts & recreation | 2021 |
| Dake Holdings Ltd | Real estate | 2024 |
| Daleview Building Contractors Ltd | Construction | 2015 |
| Daleview Property Holdings Limited | Real estate | 2021 |
| Damian Packer Engineering Limited | Professional & scientific | 2006 |
| Dance Trix Merchandise Limited | Wholesale & retail | 2022 |
| Dani Sleep Sanctuary Ltd | Education | 2025 |
| Daniel Brewer Estate Agents Limited | Real estate | 2014 |
| Daniel Brewer Lettings Limited | Real estate | 2018 |
| Daniel Shayes Consulting Limited | Wholesale & retail | 2015 |
| Danielle Françoise Ltd | Health & social care | 2021 |
| Danlaw Estate Solutions Limited | Other services | 2018 |
| Danlaw Limited | Construction | 1981 |
| Danrea Limited | Real estate | 2025 |
| Danstar Associates Limited | Professional & scientific | 2015 |
| DAR Catering Ltd | Hospitality | 2020 |
| Dare Computing Limited | Information & communication | 1997 |
| Dare to Gleam Ltd | Administrative & support | 2021 |
| DAS Automotive (Essex) Ltd | Wholesale & retail | 2016 |
| Dash and Cash Ltd | Transport & logistics | 2023 |
| Data Centre Installers Ltd | Construction | 2014 |
| Data Centre IT Ltd | Administrative & support | 2019 |
| DAV Homes Ltd | Real estate | 2018 |
| Davdia Ltd | Administrative & support | 2022 |
| David C. COX & Company Limited | Professional & scientific | 1988 |
| David Platt Equine Limited | Professional & scientific | 2014 |
| Dawson Developments Limited | Construction | 2004 |
| Dayne Services Ltd | Other services | 2023 |
| Dazadogan Property Ltd | Real estate | 2025 |
| DB Damp Ltd | Construction | 2026 |
| DBR Accounts Limited | Professional & scientific | 2004 |
| DBS Thermal Insulations Limited | Construction | 2015 |
| DC Cars Group Limited | Wholesale & retail | 2025 |
| DC United Horizon Ltd | Financial services | 2023 |
| DCC Electrical Limited | Construction | 2016 |
| DCL Tuning Ltd | Wholesale & retail | 2020 |
| DCS Parts and Services Ltd | Manufacturing | 2018 |
| Dcsps Holdings Limited | Financial services | 2022 |
| DDB Commercials Ltd | Wholesale & retail | 2026 |
| Deanpond Limited | | 1981 |
| Debmeg's Company Limited | Health & social care | 2016 |
| Debut Aesthetics Ltd | Education | 2025 |