| D.D-R. Joinery Limited | Construction | 1997 |
| D.D. Tyres Limited | Wholesale & retail | 1999 |
| D.E.K. Design Ltd | Wholesale & retail | 2020 |
| D.G. Payne Plumbing and Heating Limited | Construction | 2014 |
| D.J. & M.P. Murray (Properties) Limited | Other services | 1967 |
| D.J.M. Site Installations Ltd. | Manufacturing | 2015 |
| D.N.B (Private Clients) Limited | Administrative & support | 1970 |
| D.S. Bloodstock Ltd | Agriculture & fishing | 2023 |
| D1 Estates Limited | Construction | 2022 |
| D2 Engineering Limited | Professional & scientific | 2018 |
| D2 Properties (Yorkshire) Ltd | Real estate | 2017 |
| D2E (UK) Ltd | Real estate | 2024 |
| D3 Estates Limited | Construction | 2023 |
| DA Services (Midlands) Limited | Other services | 2020 |
| DAB Auto Ltd | Wholesale & retail | 2024 |
| DAB Entertainment Ltd | Arts & recreation | 2023 |
| Dabrowski Services Ltd | Administrative & support | 2025 |
| Dacia Wolves Limited | Transport & logistics | 2024 |
| Dack Automotive Ltd | Other services | 2018 |
| Dacks Holdings Limited | Financial services | 2003 |
| Dacre Engineering Limited | Construction | 2016 |
| Dadesley Crafting CIC | Information & communication | 2021 |
| Dado Cafe Limited | Hospitality | 2024 |
| DAE Traffic Ltd | Construction | 2022 |
| Dafa Group Ltd | Manufacturing | 2018 |
| Dafern Limited | Health & social care | 2014 |
| Daily Food & Wine Ltd | Wholesale & retail | 2022 |
| Dainty Doris Ltd | Hospitality | 2016 |
| Daisy Belton PMU Ltd | Wholesale & retail | 2023 |
| Daisy BSL Limited | Professional & scientific | 2018 |
| Daisytrends Limited | Wholesale & retail | 2026 |
| DAK Aesthetics Limited | Health & social care | 2022 |
| Dakin Logistics Ltd | Transport & logistics | 2017 |
| Dale Enterprises Limited | Real estate | 2022 |
| Dale Pitt Lakes & Lodges Ltd. | Hospitality | 2025 |
| Dale Steel Buildings Ltd | Construction | 2025 |
| Dalip Property Limited | Real estate | 2022 |
| Dalkilic Properties Ltd | Real estate | 2025 |
| DAM Electrical & Security Limited | Construction | 2002 |
| Damaac Property Ltd | Construction | 2026 |
| Damat Holding Limited | Financial services | 2021 |
| Dames Properties Ltd | Real estate | 2024 |
| Damian Slack Transport Ltd | Transport & logistics | 2016 |
| Damian Smyth Consulting Ltd | Administrative & support | 2025 |
| Damian&Sons Ltd | Transport & logistics | 2022 |
| Damp MAN Dave Ltd | Professional & scientific | 2025 |
| Dampuj Ltd | Transport & logistics | 2025 |
| DAN Gosling 32 Limited | Arts & recreation | 2009 |
| DAN Gosling 32 Properties Limited | Real estate | 2019 |
| DAN Hunt Financial Planning Limited | Financial services | 2026 |
| Danaqua Ltd | Professional & scientific | 2025 |
| Danby Plumbing and Heating Ltd | Construction | 2025 |
| Dance ETC Ltd | Wholesale & retail | 2012 |
| Dancemode Company Ltd | Education | 2025 |
| Danco Haulage Ltd | Transport & logistics | 2025 |
| Dancoy Ltd | Manufacturing | 2016 |
| Daney Finance Holding Limited | Financial services | 2025 |
| Daniel Cairns TM Ltd | Public administration | 2025 |
| Daniel Driving Solutions Ltd | Transport & logistics | 2025 |
| Daniel LEE Robinson Ltd | Other services | 2023 |
| Daniel Oprea Ltd | Transport & logistics | 2026 |
| Daniel Velizarie Ltd | Construction | 2024 |
| Daniel-Mirel Ltd | Transport & logistics | 2023 |
| Daniela Lisita UK Ltd | Construction | 2019 |
| Danielle Tabor Properties Ltd | Real estate | 2026 |
| Daniels Digital Ltd | Professional & scientific | 2025 |
| Danifem Limited | Wholesale & retail | 2021 |
| Dannat BMS Limited | Construction | 2022 |
| Dannix Limited | Information & communication | 2006 |
| Danny Adams Rope Techniques Ltd | Construction | 2017 |
| Danny Cowell Golf Ltd | Education | 2024 |
| Danny M Rentals Ltd | Real estate | 2025 |
| Danomey Ltd | Hospitality | 2022 |
| Dans Garden Care Ltd | Administrative & support | 2026 |
| Dansova Glory Limited | Health & social care | 2026 |
| Dantom (Homes) Developments Limited | Construction | 1992 |
| Danube Courier Services Ltd | Wholesale & retail | 2014 |
| Danum Air Conditioning and Refrigeration Ltd | Manufacturing | 2006 |
| Danum Aluminium Limited | Manufacturing | 2011 |
| Danum Cars Limited | Wholesale & retail | 2023 |
| Danum Civil Engineering Limited | Construction | 2016 |
| Danum Consulting Ltd | Professional & scientific | 2024 |
| Danum Couplings Ltd | Manufacturing | 2014 |
| Danum Daisies Daycare Limited | Health & social care | 2014 |
| Danum Energy Services Limited | | 1984 |
| Danum Engineering Limited | Professional & scientific | 2024 |
| Danum Excavations Ltd | Construction | 2025 |
| Danum Farming Limited | Agriculture & fishing | 2006 |
| Danum Filmworks Limited | Information & communication | 2024 |
| Danum Fire Systems Limited | Construction | 2018 |
| Danum Food Store Ltd | Wholesale & retail | 2025 |
| Danum Fulfilment Services Ltd | Administrative & support | 2022 |
| Danum Global Ltd | Transport & logistics | 2025 |
| Danum Group Ltd | Wholesale & retail | 2025 |
| Danum Holding Company One Ltd | Financial services | 2024 |
| Danum Holding Company Two Ltd | Financial services | 2024 |
| Danum Homecare Ltd | Health & social care | 2008 |
| Danum Homes Limited | Construction | 2018 |
| Danum Investment Company Limited | Real estate | 1990 |
| Danum Investment Solutions Ltd | Professional & scientific | 2022 |