| Dantel Limited | Construction | 2016 |
| Darren Phillips Mechanical (DPM) Limited | Construction | 2015 |
| DAS Finance Ltd | Financial services | 2019 |
| Dasgupta HR Consulting Limited | Administrative & support | 2012 |
| Dash Topco Limited | Administrative & support | 2024 |
| Data Migrator Ltd | Information & communication | 2012 |
| Data Planning Ltd | Extraterritorial | 2012 |
| Data Protection Officers for Education Limited | Professional & scientific | 2020 |
| Datarising Ltd | Professional & scientific | 2023 |
| Datta Advisory Limited | Construction | 2018 |
| Dauntless Boats & Storage Ltd | Transport & logistics | 2018 |
| Dave Keeling Limited | Arts & recreation | 2007 |
| Davey Byrne Limited | Arts & recreation | 2025 |
| David Diack Limited | Other services | 2017 |
| David Forsyth Floors Limited | Construction | 2015 |
| David Gentry Commercial Management Ltd | Construction | 2023 |
| David Jenkinson Design Limited | Professional & scientific | 2005 |
| David Martin Estate Agents Ltd | Real estate | 2019 |
| David Roberts Limited | Wholesale & retail | 2002 |
| David Wilkin Electrical Limited | Construction | 2015 |
| Davis Construction (South East) Limited | Construction | 1997 |
| DAW Facades Ltd | Construction | 2022 |
| DAW Property Investments Limited | Real estate | 2020 |
| Dawbarns Limited | Professional & scientific | 2025 |
| Daygustation Limited | Administrative & support | 2008 |
| DB Audio Solutions Ltd | Professional & scientific | 2017 |
| DB Design and Print (UK) Limited | Manufacturing | 2016 |
| DB LEE & DB LEE Limited | Administrative & support | 2019 |
| DB LOS Enterprises Limited | Manufacturing | 2025 |
| DB Premier Solutions Ltd | Professional & scientific | 2024 |
| DBM Construction Group Limited | Construction | 2019 |
| DC Forex Limited | Information & communication | 2023 |
| DCA BR Ltd | Financial services | 2019 |
| DCC Plumbing Solutions Limited | Construction | 2021 |
| Dclo Property Limited | Real estate | 2020 |
| DD Property Investments Limited | Real estate | 2017 |
| DDB Design & Building Ltd | Construction | 2024 |
| DDR Property Developments Limited | Real estate | 2020 |
| DE Florinier Consulting Ltd | Information & communication | 2007 |
| Dead Bird Ltd | Information & communication | 2012 |
| Deadline Communications Limited | Information & communication | 2004 |
| Deal Bros. Limited | Agriculture & fishing | 2000 |
| Dean & G Ltd | Hospitality | 2024 |
| Dean & Holland Ltd | Administrative & support | 2021 |
| Dean Snell Electrician Ltd | Energy | 2019 |
| Deane Charles Limited | Arts & recreation | 2024 |
| Debbie Jane Limited | Wholesale & retail | 2019 |
| Debt Consultancy London Limited | Professional & scientific | 2022 |
| Decadorn Ltd | Wholesale & retail | 2011 |
| Decadorn Retail Limited | Wholesale & retail | 2022 |
| Decor Ritzy Ltd | Wholesale & retail | 2025 |
| Dedecan Ltd | Hospitality | 2019 |
| Degema Trade Windows Limited | Other services | 2000 |
| DEI Tech Solutions Ltd | Administrative & support | 2025 |
| Deli Espana Limited | Administrative & support | 2014 |
| Delta 4 Real Estates Ltd | Real estate | 2023 |
| Delta 5 Trading Limited | Real estate | 2009 |
| Deltasource Limited | Professional & scientific | 2017 |
| DEM Group Holdings Ltd | Financial services | 2024 |
| Demo One Limited | Construction | 1981 |
| Deprin Management Ltd | Construction | 2022 |
| Derix Limited | Health & social care | 2006 |
| Dermamind Limited | Health & social care | 2022 |
| Deshi World Foods Ltd | Wholesale & retail | 2026 |
| Design Print & Display Ltd | Professional & scientific | 2016 |
| DESIGN33 Interiors Ltd | Professional & scientific | 2022 |
| Designed by Carley Ltd | Other services | 2020 |
| Designwiser Ltd | Professional & scientific | 2011 |
| Desypher Ltd | Financial services | 2021 |
| Detek Fire & Security Services Limited | Public administration | 1995 |
| Deterix Ltd | Information & communication | 2016 |
| DEV Lettings LLP | | 2023 |
| Devarapu Studios Ltd | Manufacturing | 2025 |
| Develop Decisions Consultancy Ltd | Professional & scientific | 2022 |
| Developed Software Limited | Information & communication | 2016 |
| Dewstone Limited | Construction | 2008 |
| DF Investment Properties Limited | Real estate | 2026 |
| DF Products Limited | Wholesale & retail | 2025 |
| DGH Building Services Ltd | Construction | 2022 |
| DGM Auto Repairs Ltd | Wholesale & retail | 2024 |
| DGS Project Services Ltd | Professional & scientific | 2011 |
| Dgstreeservices Limited | Agriculture & fishing | 2025 |
| DGW Building Ltd | Construction | 2022 |
| DH (Romsey) Ltd | Extraterritorial | 2019 |
| Dhawan Limited | Financial services | 2025 |
| Dhawan Real Estate Limited | Real estate | 2025 |
| Diabhi UK Limited | Wholesale & retail | 2020 |
| Diameno Limited | Wholesale & retail | 2024 |
| Diamond Exterior Cleaning Specialists Ltd | Administrative & support | 2024 |
| Diamond Pave and Landscaping Ltd | Administrative & support | 2018 |
| Dietryinclothing Limited | Wholesale & retail | 2013 |
| Digiplat Ltd | Professional & scientific | 2015 |
| Digital Consulting Solutions Limited | Information & communication | 2012 |
| Digital Identity Encryption Device Limited | Information & communication | 2024 |
| Digital States Limited | Information & communication | 2018 |
| Dilara Designs Ltd | Professional & scientific | 2018 |
| Diligent Consultancy Limited | Information & communication | 2013 |
| Direct Cooling Services (London) Limited | Construction | 2017 |
| Direct Media Solutions Limited | Information & communication | 2019 |
| Direct Power Ltd | Construction | 2018 |