| Cutting Edge Barbers Limited | Other services | 2013 |
| CVC Build Ltd | Construction | 2021 |
| CVK Consultancy Ltd | Professional & scientific | 2019 |
| CWG Studios Limited | Information & communication | 2021 |
| CXZ Utilities Ltd | Construction | 2026 |
| Cybald Solutions Limited | Professional & scientific | 2009 |
| Cyber Resilient Consulting Ltd | Information & communication | 2025 |
| Cyber Security Operations Ltd | Information & communication | 2025 |
| Cyberrey Ltd | Information & communication | 2023 |
| Cymex Limited | Information & communication | 2014 |
| CYP Plumbing & Electric Ltd | Households | 2026 |
| Cyprus Family Butchers Ltd | Wholesale & retail | 2020 |
| Cyprus Omega Ltd | Wholesale & retail | 2019 |
| CZ Fitness Ltd | Transport & logistics | 2026 |
| D & a Trading Ltd | Wholesale & retail | 2026 |
| D & J Ceilings Limited | Construction | 2014 |
| D & M Law Ltd | Real estate | 2021 |
| D & S Legal Consultancy Ltd | Professional & scientific | 2025 |
| D & T Property Ltd | Real estate | 2015 |
| D & Toni Investments Limited | Information & communication | 2018 |
| D B L Limited | Wholesale & retail | 1992 |
| D M Facilities H Limited | Manufacturing | 2012 |
| D M Facilities Limited | Manufacturing | 2014 |
| D P Metering Services Ltd | Construction | 2018 |
| D Productions Ltd | Construction | 2023 |
| D&C Counting Ltd | Professional & scientific | 2017 |
| D&E Smart Building Solutions Ltd | Construction | 2022 |
| D&H Investment Properties Ltd | Real estate | 2025 |
| D&H Patel Properties Ltd | Real estate | 2021 |
| D&J Global HSE Consultancy Ltd | Wholesale & retail | 2021 |
| D&K Future House Ltd | Construction | 2021 |
| D&L Essex Limited | Other services | 2023 |
| D&M Fire Protection Limited | Administrative & support | 2010 |
| D&M Worcester Ltd | Hospitality | 2025 |
| D&O Property Service Limited | Construction | 2020 |
| D&R Contracting Ltd | Construction | 2023 |
| D&R Optometry Ltd | Wholesale & retail | 2025 |
| D&T Beauty Limited | Other services | 2022 |
| D&Z Limited | Hospitality | 2026 |
| D'Academy of Beauty Ltd | Education | 2021 |
| D'Marie Project Management Limited | Information & communication | 2016 |
| D-Rey Homes Services Limited | Construction | 2025 |
| D-Triumph Care Ltd | Administrative & support | 2019 |
| D.L.D. Specialists Ltd | Construction | 2019 |
| D.Ramyah Ltd | Wholesale & retail | 2018 |
| D2D LOG Limited | Transport & logistics | 2023 |
| DA Ford Limited | Construction | 2018 |
| Daata Properties Limited | Real estate | 2020 |
| DAB Cleaning 21 Ltd | Administrative & support | 2021 |
| DAB Consulting Ltd | Information & communication | 2010 |
| DAB Incorporated Ltd | Financial services | 2012 |
| DAB Properties Ltd | Real estate | 2012 |
| Dabkeroots Ltd | Education | 2026 |
| Dacre Rail & Construction Ltd | Other services | 2017 |
| DAG Painters and Decorators Limited | Construction | 2026 |
| Dagenham Investments Limited | Other services | 2014 |
| Dagmara Wasilik Limited | Health & social care | 2024 |
| Dagmotors Ltd | Wholesale & retail | 2024 |
| Dairyland Cheese Co. Limited | Wholesale & retail | 2003 |
| Dais LON Limited | Wholesale & retail | 2026 |
| Daisy Blue Global Ltd | Wholesale & retail | 2025 |
| DAISY62 Ltd | Real estate | 2025 |
| Dakota Foods Limited | Hospitality | 2016 |
| Dalasha Ltd | Professional & scientific | 2019 |
| Dali Intelligence Limited | Information & communication | 2026 |
| Dallimore Consulting Ltd | Real estate | 2014 |
| Dalston Meze Grill Ltd | Hospitality | 2024 |
| Damian Szymanski Ltd | Wholesale & retail | 2018 |
| Damida Capital LP | | 2016 |
| Damp Proofing Direct Ltd | Professional & scientific | 2014 |
| Damyil UK Ltd | Wholesale & retail | 2019 |
| DAN 2 YOU Limited | Wholesale & retail | 2018 |
| DAN Grant Homes Ltd | Real estate | 2024 |
| DAN Nails & Beauty Limited | Other services | 2018 |
| DAN Ruane Carpentry Limited | Construction | 2026 |
| DAN Saints Ltd | Manufacturing | 2022 |
| Dance With Raks Limited | Arts & recreation | 2016 |
| Dandelion Care Ltd | Health & social care | 2022 |
| Dane Rashford Ltd | Administrative & support | 2024 |
| Dani Build Ltd | Construction | 2018 |
| Dani Contractors Ltd | Construction | 2013 |
| Dani Drylining Services Limited | Construction | 2007 |
| Daniel Nguyen Limited | Other services | 2022 |
| Daniel&Adrian Limited | Construction | 2016 |
| Daniela Beauty Ltd | Other services | 2021 |
| Daniellaagy Ltd | Health & social care | 2025 |
| Danny SAM Limited | Other services | 2023 |
| Dansab Services Limited | Health & social care | 2013 |
| Dansol Consulting Ltd | Information & communication | 2024 |
| DAP Building Limited | Construction | 2025 |
| DAP Drainage and Plumbing Limited | Construction | 2025 |
| DAP Lettings Ltd | Real estate | 2023 |
| Dapa Services Ltd | Administrative & support | 2025 |
| Dara Jewellery Limited | Manufacturing | 2025 |
| Dara London Loft Conversions Ltd | Construction | 2025 |
| DARIA08 Ltd | Transport & logistics | 2020 |
| Darik Products Ltd | Wholesale & retail | 2026 |
| Darin Autos Limited | Wholesale & retail | 2013 |
| Darnell Bailey Limited | Professional & scientific | 2023 |
| Darnham Limited | Extraterritorial | 2003 |