| D M F Electrical Appliances Limited | Wholesale & retail | 2025 |
| D MAC Security Limited | Public administration | 2026 |
| D N Property Maintenance Limited | Administrative & support | 2012 |
| D Parry Wptc Limited | Wholesale & retail | 2025 |
| D S K Interiors Limited | Construction | 2002 |
| D Simpson Services Ltd | Other services | 2016 |
| D Star Builders Ltd | Construction | 2022 |
| D Street Desserts Limited | Hospitality | 2022 |
| D T Mcgarvey & Co Ltd | Wholesale & retail | 2005 |
| D&A Carpentry and Joinery Limited | Manufacturing | 2025 |
| D&A Fixing Ltd | Construction | 2018 |
| D&A Holding London Ltd | Professional & scientific | 2020 |
| D&A Home&Garden Limited | Manufacturing | 2021 |
| D&A Procurement Limited | Professional & scientific | 2014 |
| D&A Projects Limited | Manufacturing | 2024 |
| D&A Superstore Limited | Wholesale & retail | 2005 |
| D&A Traders Ltd | Wholesale & retail | 2022 |
| D&C Drainage Services Limited | Other services | 2018 |
| D&D Events Ltd | Hospitality | 2015 |
| D&G (M) Ltd | Construction | 2014 |
| D&G Smooth Consulting Limited | Information & communication | 2011 |
| D&L Building Services Ltd | Construction | 2022 |
| D&R Taxis Ltd | Transport & logistics | 2014 |
| D'Amour Muslim Ltd | Information & communication | 2025 |
| D'Cs Engineering Solutions Ltd | Construction | 2019 |
| D'Lujo Carpentry Ltd | Manufacturing | 2025 |
| D'S Pizza Ltd | Hospitality | 2026 |
| D-Drip Shoes Ltd. | Wholesale & retail | 2025 |
| D-Raams Limited | Health & social care | 2023 |
| D. Brice & Co. Limited | Administrative & support | 1988 |
| D. S. Automotive Services Limited | Other services | 2018 |
| D.A.Footwear Limited | Wholesale & retail | 2001 |
| D.D. Coating Ltd | Construction | 2019 |
| D.G. Glass Limited | Extraterritorial | 1994 |
| D.H. Car & Truck Services Limited | Real estate | 2000 |
| D.N Private Ltd | Information & communication | 2022 |
| D.R.Holdings & Investments Limited | Real estate | 2019 |
| D.S.G Cleaning and Consultancy Ltd | Construction | 2020 |
| D.Sully & Son,Limited | Transport & logistics | 1955 |
| D0LLHOUSE Ltd | Health & social care | 2025 |
| D3O Holdings Ltd | Manufacturing | 2015 |
| D3O LAB Limited | Extraterritorial | 2005 |
| D3O Limited | Extraterritorial | 2005 |
| D4B Ltd | Professional & scientific | 2015 |
| D4BCO Ltd | Professional & scientific | 2020 |
| DA Investments Ltd | Real estate | 2023 |
| DA Solutions Ltd | Administrative & support | 2026 |
| DA Vanessa Limited | Hospitality | 2019 |
| DA Vinci Management Limited | Households | 1996 |
| Dabb & Midha Limited | Wholesale & retail | 2013 |
| Dabdo Limited | Professional & scientific | 2004 |
| DAC Sfelectrics Ltd | Wholesale & retail | 2013 |
| Dacommerce Ltd | Wholesale & retail | 2023 |
| DAD Global Ltd | Transport & logistics | 2014 |
| DAD Management Ltd | Administrative & support | 2025 |
| DAD Ventures Ltd | Wholesale & retail | 2011 |
| Daedalus Technology Ltd. | Information & communication | 2015 |
| DAG Food Ltd | Wholesale & retail | 2021 |
| Daggonite Services Ltd | Professional & scientific | 2011 |
| Daily Fresh Supermarket Limited | Wholesale & retail | 2026 |
| Dailystore Care Ltd | Health & social care | 2025 |
| Daisii Ltd | Wholesale & retail | 2025 |
| DAK Property Lettings Ltd | Real estate | 2022 |
| Daken House Limited | Real estate | 2019 |
| Daksa Properties 3 Limited | Real estate | 2025 |
| Dakshinyaa Limited | Extraterritorial | 2020 |
| Dakshya Restaurants Ltd | Hospitality | 2025 |
| Dalbermedia Limited | Information & communication | 2016 |
| Dale Solutions Limited | Information & communication | 2004 |
| Dalex Health Ltd | Public administration | 2021 |
| Daley Signs Ltd | Wholesale & retail | 2019 |
| Daleys ER Limited | Transport & logistics | 2025 |
| Dalia Bradley Limited | Real estate | 2014 |
| Dallow Fish Bar Limited | Hospitality | 2014 |
| Dalon International Limited | Wholesale & retail | 2017 |
| Dals Stores Limited | Administrative & support | 2001 |
| Dalssn Ltd | Administrative & support | 2017 |
| Dalstrade Limited | Real estate | 1998 |
| Dalton Complete Refurbishment and Maintenance Services Ltd | Construction | 2025 |
| Dalton Green Energy Limited | Construction | 2025 |
| Daltrey Trading Limited | Wholesale & retail | 2025 |
| Damage Corp Ltd | Financial services | 2024 |
| Damas Grill Croydon Ltd | Hospitality | 2025 |
| Damascus Desserts Limited | Manufacturing | 2012 |
| Damascus Properties Limited | Manufacturing | 2007 |
| Damaz Management Company Limited | Households | 2003 |
| Damian Pro Deliveries Ltd | Transport & logistics | 2025 |
| Damp & Timber Tech Limited | Professional & scientific | 2010 |
| DAN Box Ltd | Transport & logistics | 2015 |
| DAN Charity Photography Ltd | Professional & scientific | 2006 |
| DAN Studios Ltd | Extraterritorial | 2019 |
| DAN UK Services Ltd | Financial services | 2025 |
| Dana Events Limited | Hospitality | 2025 |
| Danbeth Limited | Health & social care | 2021 |
| Dance Feet CIC | Education | 2025 |
| Dancesport International Limited | Wholesale & retail | 1982 |
| Dancom Advisory Ltd | Information & communication | 2024 |
| Dandec Enterprises Limited | Construction | 2011 |
| Dane House RTM Company Limited | Households | 2021 |
| Danefield Court Residents Association Limited | Households | 1991 |