| Credentia Consultants Ltd | Administrative & support | 2016 |
| Crescent Construction Limited | Construction | 2021 |
| Cress & Wolfe Limited | Professional & scientific | 2024 |
| Crewplumbers Limited | Construction | 2011 |
| Crimewatch Ltd | Administrative & support | 2015 |
| Cris Plumbing Ltd | Construction | 2019 |
| Crispcycle Ltd | Water & waste | 2025 |
| Croc&Sons Ltd | Transport & logistics | 2019 |
| Cronin Consulting Limited | Professional & scientific | 2026 |
| Crown & Ridge Ltd | Other services | 2025 |
| CS Dental Laboratory Ltd | Manufacturing | 2021 |
| CS Training & Consultancy Ltd | Public administration | 2021 |
| CTZ Landscapes Ltd | Administrative & support | 2025 |
| Cuig Group Holdings Limited | Financial services | 2012 |
| Cult Solutions Ltd | Construction | 2022 |
| Cultural Agenda Limited | Professional & scientific | 2008 |
| Cumberland Court Limited | Hospitality | 1997 |
| Cunningham Properties Limited | Construction | 1961 |
| Curiosity Square Limited | Information & communication | 2025 |
| Curious & Curiouser Alice Holdings Ltd | Wholesale & retail | 2024 |
| Custom Fitt Ltd | Construction | 2018 |
| CVM Properties Limited | Real estate | 2026 |
| CW Financial Services Limited | Financial services | 2026 |
| Cwain Ltd | Information & communication | 2012 |
| CWR Management RTM Company Limited | Extraterritorial | 2014 |
| CXI Ltd | Wholesale & retail | 2025 |
| Cyanic Capital Ltd | Real estate | 2022 |
| Cyclic Ltd | Wholesale & retail | 2021 |
| D & D Retail One Ltd | Wholesale & retail | 2026 |
| D & M Freedman Limited | Wholesale & retail | 2012 |
| D & R Technical Data Solutions Ltd | Other services | 2013 |
| D & Y Holdings Ltd | Real estate | 2022 |
| D G Tailors UK Limited | Manufacturing | 2011 |
| D Mcgrath Limited | Arts & recreation | 2008 |
| D Nitu Haulage Ltd | Wholesale & retail | 2017 |
| D&E Cars Ltd | Wholesale & retail | 2022 |
| D&M Brothers Ltd | Real estate | 2025 |
| D&S Four Seasons Ltd | Wholesale & retail | 2023 |
| D&S Property Renovation Services Limited | Other services | 2024 |
| D.L.K Consultancy Ltd | Construction | 2021 |
| D.S. Tiling Services Limited | Construction | 2005 |
| D.U.H.Y Insulate Ltd | Construction | 2021 |
| D.W. Building Solutions Limited | Construction | 2011 |
| D1ST Ltd | Real estate | 2022 |
| D2ST Ltd | Real estate | 2022 |
| DA Commercial Cleaning Company Ltd | Administrative & support | 2019 |
| DA Commercial Cleaning Extra Ltd | Administrative & support | 2021 |
| Daboyzzpr Ltd | Arts & recreation | 2024 |
| Dado Supplies UK Ltd | Wholesale & retail | 2018 |
| Daebes Ness Ltd | Administrative & support | 2025 |
| Daes Trading Ltd | Wholesale & retail | 2026 |
| Daily Car Service Ltd | Wholesale & retail | 2026 |
| Daksh Global Ltd | Manufacturing | 2021 |
| Daleham Farming Limited | Agriculture & fishing | 2017 |
| Daleham Finance Limited | Financial services | 2015 |
| Dalston Restaurant Ltd | Hospitality | 2026 |
| Damaskino Ltd | Wholesale & retail | 2017 |
| Damian Velasco Montavez Ltd | Administrative & support | 2025 |
| DAN Chesnut Group Ltd | Construction | 2017 |
| Daniel Heartman Ltd | Professional & scientific | 2025 |
| Daniel Hutton & SON Limited | Construction | 2025 |
| Danly DIE & Mould Sets Limited | Extraterritorial | 1986 |
| Danly U.K. (Holdings) Limited | Financial services | 1989 |
| Danly UK Limited | Manufacturing | 1989 |
| Danny Deco Contracts Ltd | Construction | 2020 |
| Danny Deco Limited | Construction | 2007 |
| Danny Deco Properties Ltd | Real estate | 2021 |
| Danube Properties Limited | Real estate | 2024 |
| Daplumbingandheating Ltd | Construction | 2022 |
| Darbona Restaurant and Cafe Ltd | Hospitality | 2023 |
| Dargold Properties Limited | Construction | 1988 |
| Dark Clouds of London Limited | Information & communication | 2010 |
| Darshaa Ltd | Wholesale & retail | 2010 |
| DAS Direct Construction UK Ltd | Construction | 2018 |
| Data System Solutions Limited | Information & communication | 2014 |
| Datara Consultancy Ltd | Information & communication | 2009 |
| DAV Rigging and Automation Ltd | Arts & recreation | 2022 |
| Dave-Trans Ltd | Wholesale & retail | 2020 |
| David Noel Construct 1 Ltd | Administrative & support | 2021 |
| Davired Limited | Information & communication | 2025 |
| Davis Advisors Limited | Other services | 2015 |
| Daxal Store Ltd | Wholesale & retail | 2024 |
| Dayal Control Systems Limited | Mining & quarrying | 2013 |
| Dayal Property Developers Ltd | Construction | 2023 |
| Dazoz Ltd | Information & communication | 2024 |
| DB Advanced Carpentry & Joinery Ltd | Manufacturing | 2006 |
| DB Electrical & Plumbing Ltd | Construction | 2026 |
| DBP Mart Ltd | Wholesale & retail | 2026 |
| DBZ Events Boutique Limited | Hospitality | 2011 |
| DC & EC Property Limited | Real estate | 2024 |
| DC Directions Ltd | Transport & logistics | 2025 |
| DCM Property Investments Ltd. | Real estate | 2017 |
| Dcre Asset Management Limited | Real estate | 2022 |
| Dcruz Trading Ltd | Professional & scientific | 2025 |
| DCS Cars Ltd | Administrative & support | 2019 |
| DDJ Productions Ltd | Information & communication | 2025 |
| DDR Machinery Sales & Service Limited | Manufacturing | 2025 |
| DDS Flexcap Investments Limited | Transport & logistics | 2025 |
| DE Technology Consulting Limited | Information & communication | 2016 |
| Deacon Decorators Ltd | Construction | 2012 |