| Crumball Rally Limited | Administrative & support | 2006 |
| Crux Publishing Limited | Information & communication | 2011 |
| Crystal Build Ltd | Construction | 2015 |
| Cuberoots Digital Ltd | Information & communication | 2026 |
| Curlew Consultancy Services Limited | Financial services | 2018 |
| Custodian Global Consult Ltd | Professional & scientific | 2023 |
| Custom Car Repair Ltd | Other services | 2013 |
| CW Hack Limited | Professional & scientific | 2011 |
| Cybersandbox Limited | Administrative & support | 2023 |
| Cynicklee Limited | Hospitality | 1977 |
| D & R Carpentry Limited | Construction | 2003 |
| D and T Energy Services Ltd | Construction | 2015 |
| D H & H H Ford Limited | Real estate | 1973 |
| D Hartshorn Ltd | Construction | 2016 |
| D&D Painter and Decorator Limited | Construction | 2025 |
| D&L Security Ltd | Administrative & support | 2019 |
| D&R Plumbing & Heating Services Ltd | Construction | 2017 |
| D.A.T Scaffolding Ltd | Construction | 2021 |
| D.Coomber Plumbing & Heating Ltd | Construction | 2024 |
| D.Jempson Limited | Manufacturing | 2009 |
| D.P.W GAS Services Ltd | Construction | 2021 |
| Dale Economic and Energy Insights Ltd | Professional & scientific | 2026 |
| Dalea Ltd | Wholesale & retail | 2025 |
| Daniel Reilly Ltd | Professional & scientific | 2020 |
| Danny Jones UK Ltd | Construction | 2015 |
| Danoch Global Limited | Hospitality | 2024 |
| Dansie Properties Limited | Real estate | 2023 |
| Dara Furniture Limited | Wholesale & retail | 2016 |
| Daredevil Films Ltd | Information & communication | 2019 |
| Dark Symmetry Ltd | Information & communication | 2015 |
| Datagenix Limited | Administrative & support | 2010 |
| Davbeth Properties Limited | Real estate | 2025 |
| David Jones Personal Training Ltd | Arts & recreation | 2021 |
| David Roberts Hooker Limited | Real estate | 2025 |
| Dawwat Limited | Hospitality | 2023 |
| Day Property Solutions Limited | Construction | 2022 |
| DB Pools and Pipework Limited | Construction | 2026 |
| DB1UK Limited | Wholesale & retail | 2015 |
| Dbfrs Ltd | Professional & scientific | 2022 |
| DBL Controls Ltd | Construction | 2021 |
| DCJ23 Ltd | Real estate | 2023 |
| DE Clifton Consulting Limited | Professional & scientific | 2021 |
| Decopompoms Ltd. | Wholesale & retail | 2012 |
| Delos Bakery Limited | Wholesale & retail | 2009 |
| Delves White Ltd. | Professional & scientific | 2017 |
| Dennis OBI Limited | Information & communication | 2026 |
| Denoras Close Management Limited | Households | 2020 |
| Dent Dude Limited | Wholesale & retail | 2006 |
| Dent Implant LAB Ltd | Manufacturing | 2020 |
| Derca Property Ltd | Real estate | 2025 |
| Design Alchemy UK Limited | Other services | 2025 |
| Devtech IT Consulting Ltd | Information & communication | 2022 |
| Dewi Group Holdings Ltd | Real estate | 2025 |
| DF Architecture Limited | Professional & scientific | 2021 |
| DGB Contractors Limited | Construction | 2025 |
| DGU Glass Ltd | Manufacturing | 2020 |
| DHU Trading Ltd | Administrative & support | 2017 |
| Diabetes Wellness Hub Ltd | Public administration | 2025 |
| Diacon Healthcare Ltd | Health & social care | 2021 |
| Diamalaay Limited | Wholesale & retail | 2006 |
| Diamond Kebab London Ltd | Hospitality | 2019 |
| Diamond Loft Spaces Ltd | Construction | 2018 |
| Diamond Signature Cleaning Service Limited | Administrative & support | 2026 |
| Diamond VIP Cleaning (Surrey) Limited | Administrative & support | 2023 |
| Dickinson Support Services Limited | Professional & scientific | 1994 |
| Different Digital Ltd | Information & communication | 2009 |
| Digital Display Networks Limited | Information & communication | 2020 |
| Digital Specialist Consulting Ltd | Real estate | 2018 |
| Digitox Limited | Information & communication | 2020 |
| Dijo Cafe & Deli Ltd | Wholesale & retail | 2024 |
| Dila & HAN Property Ltd | Real estate | 2026 |
| Diligent Spirit Consultancy Services Ltd | Financial services | 2025 |
| Dimenshong Ltd | Real estate | 2024 |
| Dinn Transport Ltd | Transport & logistics | 2021 |
| Dino Trading Ltd | Wholesale & retail | 2025 |
| Dirty South Power Wash Ltd | Administrative & support | 2023 |
| Display My Bricks Ltd | Wholesale & retail | 2025 |
| Diva Body Sculpting Limited | Other services | 2025 |
| DJJ Ltd | Wholesale & retail | 2017 |
| DLC Building and Property Services Limited | Real estate | 2021 |
| DLW Company Formation Services 0015 Limited | Extraterritorial | 2013 |
| DMG Technological Information Ltd | Information & communication | 2024 |
| DNA Express Couriers Limited | Transport & logistics | 2010 |
| DNA Horticultural Ltd | Administrative & support | 2024 |
| DNA Plumbing and Heating Ltd | Construction | 2020 |
| DNZ Dizayn Ltd | Wholesale & retail | 2022 |
| Dobrev Carpentry & Maintenance Ltd | Manufacturing | 2022 |
| Docendo Limited | Information & communication | 2006 |
| Dodsworth Properties Limited | Construction | 1968 |
| Doerr Dallas Valuations Limited | Other services | 2016 |
| Dog&Drone Limited | Other services | 2017 |
| Dominion Property Partnership Ltd | Real estate | 2021 |
| Door Dash Limited | Wholesale & retail | 2025 |
| Dots Eight Limited | Real estate | 2025 |
| Double Diamond Accountancy Services Limited | Professional & scientific | 2013 |
| Double Glazing Services (Crawley) Ltd | Construction | 2014 |
| Down to a Penny Limited | Professional & scientific | 2020 |
| Drain Brain South East Limited | Water & waste | 2014 |
| Drain Master (SW) Ltd | Water & waste | 2024 |
| Drew Quality Zone Ltd | Wholesale & retail | 2023 |