| Crown Perfect Limited | Other services | 2021 |
| Crown Trading Limited | Wholesale & retail | 1987 |
| Crusader Films Limited | Information & communication | 2025 |
| Cryotomy Ltd | Health & social care | 2018 |
| Crystal Place Management Limited | Households | 2011 |
| CSM Catering Ltd | Hospitality | 2024 |
| CTD Advisors Ltd | Professional & scientific | 2018 |
| Ctsf Ltd | Real estate | 2020 |
| Cube Group Services Ltd | Wholesale & retail | 2019 |
| Cube Impact Limited | Information & communication | 2012 |
| Curran Properties Limited | Construction | 2008 |
| Cutting Zone Limited | Other services | 2002 |
| Cwst Ltd | Professional & scientific | 2026 |
| Cycle Power Limited | Wholesale & retail | 2007 |
| Cycle Strength Ltd | Health & social care | 2023 |
| D & G Property Maintenance (Commercial) Limited | Construction | 2006 |
| D & G Property Maintenance Limited | Administrative & support | 2002 |
| D Lawrence Plumbing and Heating Ltd | Construction | 2019 |
| D.Carpenter Solutions Limited | Construction | 2021 |
| Da.Care Islands Ltd | Wholesale & retail | 2023 |
| Daag Limited | Professional & scientific | 2012 |
| DAB Technical Limited | Administrative & support | 2013 |
| DAB Technical Recruitment Limited | Administrative & support | 2006 |
| Daleway Solutions Limited | Information & communication | 2011 |
| Dalmeny Developments Surrey Ltd | Construction | 2018 |
| Damasca Ltd | Hospitality | 2016 |
| Damogo Ltd. | Professional & scientific | 2019 |
| Danchard Ltd | Hospitality | 2016 |
| Dancos Construct Ltd | Construction | 2019 |
| Dancos Construct Maintainance Ltd | Construction | 2022 |
| Dani's AD Services Ltd | Administrative & support | 2016 |
| Danielle Donaldson Consulting Limited | Professional & scientific | 2016 |
| Dansi Property Management Ltd | Real estate | 2025 |
| Danton Progm Ltd | Professional & scientific | 2018 |
| Dark Child Ltd | Other services | 2017 |
| Dark Thistle Film and TV Rigging Ltd | Information & communication | 2022 |
| Dasla IT Ltd | Information & communication | 2025 |
| Datadynamo Ltd | Information & communication | 2021 |
| David Simpson Gardens Ltd | Administrative & support | 2016 |
| Davidson Enterprises Limited | Professional & scientific | 2005 |
| DAW Building Services (London) Ltd | Real estate | 2015 |
| DB PA Services Limited | Administrative & support | 2022 |
| DC Gardens Ltd | Professional & scientific | 2022 |
| DE Silva Solutions Limited | Other services | 2015 |
| Decor House London Ltd | Construction | 2014 |
| Dedelyanov Ltd | Construction | 2013 |
| DEI Volente Ltd | Administrative & support | 2010 |
| Delicious Sushi Ltd | Hospitality | 2026 |
| Delighthouse Investments Ltd | Construction | 2024 |
| Delta Tech Global Limited | Information & communication | 2012 |
| Denvin Ltd | Other services | 2019 |
| Deplogy Ltd | Information & communication | 2013 |
| Desca Limited | Wholesale & retail | 2020 |
| Design in London Limited | Professional & scientific | 2015 |
| Desired Construction Ltd | Construction | 2023 |
| Desired Plumbing LLP | | 2021 |
| Devalor Consulting Ltd | Professional & scientific | 2026 |
| Devco Property Ltd | Construction | 2025 |
| DGD Accounts Services Limited | Professional & scientific | 2002 |
| Dhwarika Limited | Information & communication | 2012 |
| Digital Data Mind Ltd | Information & communication | 2024 |
| Diligenta QA Services Ltd | Information & communication | 2013 |
| Dill Ministries Limited | Other services | 2014 |
| DIME2 Limited | Real estate | 2021 |
| Dimensions Specialist Recruitment Ltd | Administrative & support | 2022 |
| Direct Sports Consulting Ltd | Administrative & support | 2010 |
| Dirt Nurse Ltd | Manufacturing | 2022 |
| Disha Associates Ltd | Health & social care | 2014 |
| Dispensamor Ltd | Hospitality | 2021 |
| Diverse Technology Ltd | Information & communication | 2007 |
| Diversity Maintenance Services Limited | Other services | 2018 |
| Diversity Property Services Ltd | Construction | 2025 |
| Dividend Analysis Limited | Information & communication | 1999 |
| Divine Count Limited | Wholesale & retail | 2022 |
| Divine Homes(Uk) Ltd | Real estate | 2022 |
| Dixon Brothers Media Ltd | Arts & recreation | 2016 |
| DJ Sales & Design Consultancy Ltd | Information & communication | 2014 |
| Djaoo Ltd | Information & communication | 2017 |
| DM IT Consultants Ltd | Information & communication | 2014 |
| Dmpd Services Ltd | Information & communication | 2022 |
| Dmufti Ltd | Wholesale & retail | 2025 |
| Docmal Limited | Health & social care | 2010 |
| Dogoodfilms Limited | Information & communication | 2012 |
| DON Snack Hub Ltd | Wholesale & retail | 2026 |
| Dongho Limited | Hospitality | 2019 |
| Donnington Freehold Company Limited | Extraterritorial | 2019 |
| Doontec Plumbing and Heating Limited | Construction | 2025 |
| Dora's Greek Food Ltd | Hospitality | 2023 |
| Dorchester Property Developments Ltd | Other services | 2019 |
| Dorienpalm Company Limited | Construction | 2012 |
| Dosanis (2005) Limited | Professional & scientific | 2005 |
| Doughies Limited | Hospitality | 2009 |
| DR Haider Health Concierge Ltd | Health & social care | 2022 |
| DR Poonam Pingle Ltd | Health & social care | 2024 |
| DR Sindhu Pathma Ltd | Health & social care | 2022 |
| DR. Roofing Service Ltd | Construction | 2010 |
| Dreamsteaders Ltd | Professional & scientific | 2023 |
| Drishi Properties Ltd | Real estate | 2023 |
| Drishi Solutions Ltd | Information & communication | 2022 |
| Drive Online UK Ltd | Administrative & support | 2026 |