| D&S Properties Services Limited | Real estate | 2025 |
| D&S Western Ltd | Hospitality | 2025 |
| D&V Engineering Ltd | Professional & scientific | 2026 |
| D&V Tilingpro Ltd | Construction | 2020 |
| D'Arce Media Ltd | Professional & scientific | 2026 |
| D'Jots Ltd | Hospitality | 2022 |
| D'Mandalia Limited | Manufacturing | 2026 |
| D'Onghia Ltd | Health & social care | 2022 |
| D'S Cakes Leicester Limited | Manufacturing | 2025 |
| D-Bit Technology Consulting Ltd | Information & communication | 2023 |
| D-Mart Group (U.K) Ltd | Wholesale & retail | 2021 |
| D-Rex Group Ltd | Professional & scientific | 2025 |
| D. C. E. L. Systems Ltd | Administrative & support | 2023 |
| D. Jones Lift Services Limited | Construction | 2008 |
| D. R. Measom Ltd | Construction | 2017 |
| D. Tallis Hire Limited | Administrative & support | 1978 |
| D.A.L. (Business Consultants) Limited | Professional & scientific | 1988 |
| D.A.S Enterprise Couriers Ltd | Transport & logistics | 2026 |
| D.A.W. Finance Co. Limited | Professional & scientific | 1961 |
| D.Ashleigh Installations Ltd | Administrative & support | 2024 |
| D.Ashleigh Vinyl Installations Ltd | Administrative & support | 2025 |
| D.B.C. Clinic Limited | Extraterritorial | 2025 |
| D.B.Q. Focus Ltd | Transport & logistics | 2008 |
| D.D.I. Systems Limited | Information & communication | 1988 |
| D.D.S. Limited | Professional & scientific | 2009 |
| D.G.N. Design Limited | Manufacturing | 1992 |
| D.G.R. Builders Ltd | Construction | 2019 |
| D.G.T. Transport Ltd | Transport & logistics | 2002 |
| D.H.S Specialised Haulage Limited | Transport & logistics | 2018 |
| D.H.S. Tool Supply Co. Limited | Wholesale & retail | 1982 |
| D.I.PROMOTION1985 Ltd. | Administrative & support | 2025 |
| D.L.B. Logistics Limited | Information & communication | 2004 |
| D.Lomax Services Limited | Professional & scientific | 1971 |
| D.M Xpress Services Ltd | Transport & logistics | 2018 |
| D.M.H. Pharm Ltd | Wholesale & retail | 2000 |
| D.P.Soft Furnishings Ltd | Manufacturing | 2019 |
| D.R. Measom Contractors Ltd | Extraterritorial | 2025 |
| D.S.P. Limited | Real estate | 1994 |
| D.T. Developments Limited | Administrative & support | 2003 |
| D.W Automation Ltd | Construction | 2024 |
| D/Vine Trading Group Limited | Wholesale & retail | 2023 |
| D1F Limited | Construction | 2025 |
| D2 KNR Ltd | Health & social care | 2020 |
| D2T Services Limited | Construction | 2024 |
| D3C Electrical Limited | Construction | 2024 |
| D3C Properties Limited | Real estate | 2024 |
| D4UD Bookkeeping Services Limited | Professional & scientific | 2023 |
| D@C Ltd | Construction | 2017 |
| DA Capo Limited | Manufacturing | 1990 |
| DA Clothing Limited | Manufacturing | 2022 |
| DA Engliscan Gesidas (the English Companions) | Education | 2000 |
| DA Homes Management Limited | Real estate | 2025 |
| DA Landscapes Ltd | Administrative & support | 2022 |
| DA Smile Ltd | Health & social care | 2026 |
| DA Spot (Derby) Ltd | Real estate | 2022 |
| DA Spot Properties Ltd | Real estate | 2019 |
| DA Vinci Procurement Ltd | Households | 2018 |
| DA21 Consultancy Ltd | Financial services | 2022 |
| DAA Developments Limited | Real estate | 2020 |
| DAA Investments Ltd | Financial services | 2019 |
| Daal & Bass Ltd | Wholesale & retail | 2025 |
| Daalap Ltd | Real estate | 2025 |
| Daana Paani Indian Cuisine Ltd | Hospitality | 2019 |
| Daas Convenience Store Ltd | Wholesale & retail | 2023 |
| DAB Civil Engineering Contractors Limited | Construction | 2000 |
| DAB Healthcare Ltd | Wholesale & retail | 2012 |
| DAB Management Solutions Ltd | Professional & scientific | 2025 |
| DAB Medical Limited | Health & social care | 2023 |
| DAB Plant Hire & Sales Limited | Wholesale & retail | 2008 |
| Dabbagh Saleha Auto Maintenance Company Ltd | Wholesale & retail | 2025 |
| Dabbofficial Ltd | Arts & recreation | 2023 |
| Dabs Investments Limited | Real estate | 2020 |
| DAC Enterprises Limited | Wholesale & retail | 2003 |
| Daciro Property Solutions Ltd | Real estate | 2019 |
| Daciro Trans Ltd | Transport & logistics | 2019 |
| Dacoy Limited | Wholesale & retail | 2019 |
| DAD Club Holdings Ltd | Wholesale & retail | 2025 |
| Dada Group Ltd | Professional & scientific | 2019 |
| Dadge Ltd | Arts & recreation | 2019 |
| Daditee Ltd | Health & social care | 2013 |
| Dadmy Ltd | Transport & logistics | 2026 |
| DAE Clothing Limited | Wholesale & retail | 2024 |
| Daedalus Engineering Ltd | Administrative & support | 2018 |
| Daewoo International (Europe) Ltd. | Wholesale & retail | 2001 |
| DAF Holdings Limited | Financial services | 2026 |
| Daffern Enterprises Limited | Administrative & support | 2017 |
| Daffodil Supported Living Limited | Health & social care | 2024 |
| Daggers Media Limited | Information & communication | 2014 |
| Dagwood Joinery Ltd | Manufacturing | 2022 |
| DAH Investments Limited | Financial services | 2023 |
| DAH Solutions Ltd | Information & communication | 2026 |
| Dahi Holdings Limited | Financial services | 2023 |
| Dahira Jeuzbul Xulob CIC | Extraterritorial | 2021 |
| Dahlia Publishing Ltd | Information & communication | 2010 |
| Dahya Pharma Limited | Wholesale & retail | 2021 |
| Dail Tiger Barber Ltd | Other services | 2025 |
| Daily Beauty Essence Ltd | Wholesale & retail | 2024 |
| Daily Deals Online Ltd | Wholesale & retail | 2017 |
| Daily Event Hire Ltd | Administrative & support | 2025 |
| Daily FIX Ltd | Wholesale & retail | 2024 |