| Curated Consulting Ltd | Professional & scientific | 2023 |
| Cushions & Coordinates Limited | Manufacturing | 2017 |
| Cutlass Recruitment Limited | Administrative & support | 2022 |
| CV Gym Property Limited | Real estate | 2016 |
| Cyber and AI Security Learning Management System Ltd | Education | 2025 |
| Cyber City Taxi Ltd | Extraterritorial | 2026 |
| Cyber Robot Ltd | Information & communication | 2025 |
| Cyber Y Limited | Information & communication | 2014 |
| Cycle Right Limited | Wholesale & retail | 2014 |
| Cypher Consulting Europe Ltd | Administrative & support | 2021 |
| Cypress Garden Services Limited | Administrative & support | 2011 |
| Cyrus Accords Foundation | Other services | 2025 |
| Czerchance Limited | Financial services | 2015 |
| Czgh Corporation Ltd | Financial services | 2023 |
| D & N Technologies Limited | Information & communication | 2001 |
| D C L Hearing Limited | Health & social care | 2002 |
| D J H Limited | Information & communication | 2009 |
| D Kumal Ltd | Professional & scientific | 2026 |
| D M Stones & Tiles Limited | Manufacturing | 2024 |
| D S P Smithys Hotel Ltd | Hospitality | 2016 |
| D&R Capital Partners Ltd | Financial services | 2026 |
| D..B. Trustees Limited | Administrative & support | 1997 |
| Daabon UK Limited | Manufacturing | 2019 |
| Daher Investments Ltd | Real estate | 2020 |
| Dairy Sense International Ltd | Manufacturing | 2026 |
| Damaar Properties Ltd | Real estate | 2021 |
| Damia Investments Ltd | Real estate | 2016 |
| Damson Close Residents Company Limited | Real estate | 2012 |
| Dance Paradise UK Limited | Information & communication | 1999 |
| Dancemyway Limited | Arts & recreation | 2006 |
| Dane END Management Company Limited | Hospitality | 2011 |
| Daneo Homes Ltd | Real estate | 2025 |
| Danobear Ltd | Professional & scientific | 2023 |
| Dante Secure IT Ltd | Information & communication | 2014 |
| Danum Ventures Limited | Real estate | 2017 |
| Dark Management Limited | Real estate | 2013 |
| Dasani Consulting Limited | Professional & scientific | 2015 |
| Dasconsult Ltd | Professional & scientific | 2024 |
| Daspro Ltd | Real estate | 2021 |
| David Alexander DAO Ltd | Real estate | 2019 |
| David Felgate Limited | Arts & recreation | 2010 |
| Davinia Limited | Professional & scientific | 2006 |
| Davos Limited | Manufacturing | 2017 |
| Daxmore Flat Management Company Limited | Households | 1982 |
| DBK20 Limited | Professional & scientific | 2015 |
| Dbvn Contractors Ltd | Construction | 2024 |
| DC Gardening Solutions Ltd | Professional & scientific | 2025 |
| DCL & Sons Limited | Extraterritorial | 2012 |
| DCL Renewables Limited | Construction | 2024 |
| DCW Retail Ltd | Wholesale & retail | 2021 |
| DDM Cars Ltd | Wholesale & retail | 2024 |
| Ddsuk (Holdings) Ltd | Health & social care | 2015 |
| Deal Limited | Wholesale & retail | 1997 |
| Dearing Developments Ltd | Real estate | 2019 |
| Decent Dumplings & Sauces Ltd | Manufacturing | 2024 |
| Dechso Properties Limited | Real estate | 2023 |
| Decobuilds Decorators Ltd | Construction | 2026 |
| Decon Group Limited | Financial services | 2024 |
| Decor Property Development Limited | Administrative & support | 2020 |
| DEE Sparks MEP Ltd | Construction | 2020 |
| Deejay Edward Ltd | Hospitality | 2023 |
| Delacourt (ZS NO 1) Ltd | Real estate | 2020 |
| Delagun Productions Limited | Manufacturing | 2025 |
| Dell Court (Northwood) Limited | Real estate | 2010 |
| Dell Court Management Company Limited | Real estate | 2007 |
| Dell Park Residents Company Limited(The) | Households | 1976 |
| Della Nelson Consultancy Limited | Professional & scientific | 2020 |
| Denewood Place (Northwood) Management Company Limited | Households | 2014 |
| Denham Grove Hotel Limited | Hospitality | 2017 |
| Denhealth Ltd | Professional & scientific | 2011 |
| Denpure Limited | Health & social care | 2026 |
| Denstudio Dental Ltd | Health & social care | 2022 |
| Denturn Ltd | Information & communication | 2015 |
| Denville Hall 2012 | Health & social care | 2012 |
| Deseret AI Limited | Information & communication | 2025 |
| Design Create Build (DCB) Architecture Ltd | Professional & scientific | 2025 |
| Desired Properties Limited | Real estate | 2003 |
| Desktop Computers Limited | Information & communication | 1991 |
| Destinology Limited | Administrative & support | 2001 |
| Detarch Limited | Information & communication | 2011 |
| Devector Consulting Limited | Information & communication | 2025 |
| Devine (Ealing) Limited | Real estate | 2013 |
| Dewji Consultancy Ltd | Information & communication | 2014 |
| Dexter Moren Associates Holdings Limited | Professional & scientific | 2018 |
| Dexter Moren Associates Limited | Professional & scientific | 2022 |
| DG Chartering Limited | Transport & logistics | 2024 |
| Dhami Commercial Property Limited | Construction | 2024 |
| Dhami Dental Limited | Health & social care | 2008 |
| Dhami Property Ltd | Real estate | 2016 |
| Dhami White Property Ltd | Real estate | 2023 |
| Dhanam Investments Ltd | Financial services | 2021 |
| Dhillon Corp Limited | Real estate | 2023 |
| Dhillon Property Limited | Real estate | 2018 |
| Diamondkiss Limited | Wholesale & retail | 2010 |
| Dianosingwithdrnadia Ltd | Health & social care | 2025 |
| Dianthus Connect Limited | Professional & scientific | 2026 |
| Didlington Fisheries Limited | Agriculture & fishing | 1950 |
| Digital Business Trade Ltd | Wholesale & retail | 2026 |
| Digital Legacy Association CIC | Information & communication | 2015 |
| Digital Media Promotions Limited | Information & communication | 1999 |