| DB Plumbing and Heating Services Ltd | Construction | 2023 |
| DB Sunflower Solutions Ltd | Administrative & support | 2021 |
| DB Symmetry Ltd | Construction | 2002 |
| Db.Dee Ltd | Wholesale & retail | 2020 |
| Dbal Computers Limited | Information & communication | 1996 |
| DBE Live Ltd | Arts & recreation | 2018 |
| DBL Access Ltd | Construction | 2026 |
| Dbmc Scaffolding Ltd | Construction | 2025 |
| DBP 33 Limited | Hospitality | 2017 |
| Dbpp Limited | Administrative & support | 2017 |
| Dbvet Ltd | Information & communication | 1997 |
| DC Digital Marketing Ltd | Information & communication | 2023 |
| DC Driver Ltd | Transport & logistics | 2015 |
| DC Engineering and Fabrications Ltd | Manufacturing | 2024 |
| DC Optix Ltd | Health & social care | 2023 |
| DC Property Management & Investment Limited | Real estate | 2022 |
| DC Therapy Ltd | Health & social care | 2022 |
| DC01 PO Limited | Professional & scientific | 2024 |
| DC01 SH Limited | Professional & scientific | 2024 |
| Dcaro Ltd | Other services | 2016 |
| Dcbe Limited | Financial services | 2014 |
| Dcbm Limited | Real estate | 2018 |
| DCD Manufacturing Ltd | Manufacturing | 2009 |
| Dcdp Investments Limited | Real estate | 2023 |
| DCG Contracting Ltd | Professional & scientific | 2019 |
| DCL Firestopping Ltd | Construction | 2025 |
| DCL Holdings Ltd | Financial services | 2025 |
| DCL Northampton Ltd | Transport & logistics | 2016 |
| Dcldaninvest Ltd | Transport & logistics | 2020 |
| DCM Perfect Carpentry Ltd | Manufacturing | 2022 |
| DCM Smart Trans Ltd | Transport & logistics | 2022 |
| Dcmv Ltd | Transport & logistics | 2019 |
| Dcruz Investments Limited | Real estate | 2024 |
| DCT Accounting Services Limited | Professional & scientific | 2005 |
| Dcwd Enterprises Limited | Professional & scientific | 2024 |
| DD Paving & Landscaping Ltd | Administrative & support | 2025 |
| DD Store Ltd | Wholesale & retail | 2026 |
| Ddcconect Ltd | Other services | 2020 |
| Ddee Events Ltd | Hospitality | 2026 |
| DDK Projects Holdings Limited | Financial services | 2026 |
| DDK Projects Limited | Professional & scientific | 2021 |
| DDL MD Ltd | Transport & logistics | 2024 |
| DDN Cleaners&Logistics Ltd | Administrative & support | 2025 |
| DDN Transport Ltd | Transport & logistics | 2022 |
| Ddpv Building Limited | Construction | 2026 |
| DDR Foods Ltd | Hospitality | 2025 |
| DDT Acquisitions Limited | Real estate | 2026 |
| Ddtear Ltd | Health & social care | 2025 |
| DE Banke Properties Ltd | Real estate | 2022 |
| DE Great Company Ltd | Extraterritorial | 2023 |
| DE Healthcare Limited | Professional & scientific | 1989 |
| DE Silva and Sons Ltd | Real estate | 2024 |
| DE Vries Medical Aesthetics Ltd | Other services | 2023 |
| De-Fence Landscaping Limited | Administrative & support | 2016 |
| DEA Logistics Ltd | Transport & logistics | 2023 |
| Deacon&Collectibles Limited | Wholesale & retail | 2025 |
| Deaeva Limited | Health & social care | 2022 |
| Deaker Ltd | Construction | 2019 |
| Deal Dining Limited | Other services | 2018 |
| Dealerfront Ltd | Information & communication | 2010 |
| Deals and Delivery Limited | Wholesale & retail | 2017 |
| DEALZ4U Limited | Other services | 2020 |
| Dean & Sons Building and Construction Limited | Construction | 2023 |
| Dean Advisory Ltd | Professional & scientific | 2026 |
| Dean Gray Carpentry Limited | Manufacturing | 2026 |
| Dean Millers Ltd | Administrative & support | 2024 |
| Dean Real Estate Ltd | Real estate | 2022 |
| Deane Architectural Limited | Construction | 2008 |
| Deane Cladding Limited | Construction | 2008 |
| Deane Roofing and Cladding Ltd | Construction | 2008 |
| Deane Roofing Ltd | Construction | 2008 |
| Deane Roofing Systems Ltd | Construction | 2008 |
| Deans Garden Spaces Drawing & Planning Services Limited | Construction | 2019 |
| Deans Property Maintenance Ltd | Construction | 2025 |
| Dearoot Limited | Construction | 1978 |
| DEB Crouch Consulting Ltd | Administrative & support | 2017 |
| Debannard Ltd | Hospitality | 2024 |
| Debbie King Limited | Professional & scientific | 2020 |
| Debdale Properties Limited | Real estate | 2013 |
| Deborah Needham Consultancy Ltd | Professional & scientific | 2024 |
| Debz Limited | Health & social care | 2013 |
| Deccan Delights Limited | Hospitality | 2025 |
| Dechoker (UK) Limited | Wholesale & retail | 2018 |
| Decolux Ltd | Construction | 2023 |
| Decopex Ltd | Real estate | 2021 |
| Decoration Nation Ltd | Extraterritorial | 2024 |
| Dedhia & Singh Consulting Ltd | Professional & scientific | 2014 |
| Dediservices Ltd | Transport & logistics | 2025 |
| Dedoro Ltd | Health & social care | 2021 |
| DEE Haulage Ltd | Transport & logistics | 2019 |
| DEE Renovation Ltd | Construction | 2025 |
| Deegan Consulting Ltd | Professional & scientific | 2012 |
| Deegold Limited | Administrative & support | 2021 |
| Deelouise Limited | Other services | 2021 |
| Deen Abaya Ltd | Wholesale & retail | 2025 |
| Deen Commercials Ltd | Real estate | 2026 |
| Deen's HFC Ltd | Hospitality | 2025 |
| Deene Farms Ltd | Agriculture & fishing | 2010 |
| Deenside Limited | Manufacturing | 1981 |
| Deep Agentics Ltd. | Information & communication | 2024 |