| Delwar Properties Ltd | Real estate | 2023 |
| Demari Property Investment Limited | Real estate | 2014 |
| Demimason Rigging Ltd | Information & communication | 2025 |
| Democratic Socialists Ltd | Other services | 2026 |
| Demoxis Ltd | Information & communication | 2025 |
| DEN Construction Ltd | Construction | 2026 |
| Denova Residential Limited | Construction | 2010 |
| Dentacare Growth Ltd | Health & social care | 2023 |
| Designers Build Ltd | Construction | 2010 |
| Desirer Limited | Wholesale & retail | 2019 |
| Destination Management Consultants USA Ltd | Administrative & support | 2022 |
| Detlev Auvermann Rare Books Limited | Wholesale & retail | 2015 |
| Develco Asset Ltd | Real estate | 2026 |
| Develco Holdings Ltd | Financial services | 2026 |
| Developnet Limited | Real estate | 1999 |
| Dexter Capital Group Limited | Financial services | 2001 |
| DFO Management Services Ltd | Professional & scientific | 2025 |
| Diamond Hand Auditors Ltd | Professional & scientific | 2021 |
| Diamond IT Consultancy Limited | Information & communication | 2024 |
| Diaval Ltd | Construction | 2018 |
| Dickinsons Accountancy Services Limited | Professional & scientific | 1996 |
| Dickinsons Computer Services Limited | Information & communication | 2002 |
| Dickinsons Trustees Limited | Administrative & support | 2014 |
| Digimaxco Ltd | Information & communication | 2025 |
| Digital Benchmark Limited | Information & communication | 2022 |
| Digital Potential Limited | Professional & scientific | 2010 |
| Digsci Solutions Ltd | Information & communication | 2025 |
| Dimiati Inc Limited | Professional & scientific | 2016 |
| Dimiauto Ltd | Wholesale & retail | 2020 |
| Dira Investments Ltd | Financial services | 2025 |
| Dira Solutions Ltd | Information & communication | 2025 |
| Direct Solutions Consultancy Ltd | Information & communication | 2024 |
| Distinctive Confectionery Limited | Wholesale & retail | 2018 |
| Djire Limited | Transport & logistics | 2020 |
| DJK Solutions Ltd | Professional & scientific | 2010 |
| DK UK Trading Ltd | Wholesale & retail | 2026 |
| DLP Management Limited | Hospitality | 2009 |
| Dmfs Consulting Ltd | Professional & scientific | 2020 |
| DMS Landscaping & Building Ltd | Construction | 2022 |
| DNA Estates Limited | Construction | 2015 |
| DO Talk Therapy Ltd | Health & social care | 2025 |
| Docwra Properties LLP | | 2026 |
| Docwra Property Management Limited | Construction | 1997 |
| Dog Colla Limited | Wholesale & retail | 2022 |
| Dogology Ltd | Other services | 2019 |
| Dogviz Limited | Information & communication | 2025 |
| Dollings Yard Management Limited | Households | 2014 |
| Dollsie Ltd | Wholesale & retail | 2023 |
| Dominic Haulage Ltd | Transport & logistics | 2022 |
| Donald Leslie & Company Limited | Other services | 2006 |
| Donaldson Energy Ltd | Professional & scientific | 2015 |
| Doppel Gang Limited | Information & communication | 2025 |
| Dorchester House Limited | Households | 1990 |
| DOT Day Limited | Information & communication | 2015 |
| Douglas Walton Energy Group Limited | Construction | 2021 |
| DOW Jones Architects Ltd | Professional & scientific | 2012 |
| Dozer Ltd | Information & communication | 2019 |
| DR a K Sandhu Ltd | Health & social care | 2025 |
| DR Emily Alteirac Psychology Ltd | Health & social care | 2020 |
| Drakes Court Residents' Association Limited | Households | 1991 |
| Dramatic Measures Ltd | Wholesale & retail | 2025 |
| Draper Projects Limited | Construction | 2007 |
| Drbikes Limited | Wholesale & retail | 2014 |
| Dreamflight | Other services | 2006 |
| Dreamsearch Ltd | Administrative & support | 2007 |
| Dresscode Fashion Limited | Administrative & support | 2013 |
| Drewsen Special Papers Limited | Wholesale & retail | 1985 |
| Dreyfus Designs Limited | Professional & scientific | 2025 |
| Drinks-On-Draught Limited | Manufacturing | 1997 |
| Drive Power Ltd | Construction | 2025 |
| Drug Safety Consultancy Limited | Health & social care | 2016 |
| Ds&K Investments Ltd | Financial services | 2020 |
| DSC Environmental Services Ltd | Administrative & support | 2017 |
| DSG Consulting Limited | Professional & scientific | 2020 |
| DSG Enterprises Limited | Hospitality | 2024 |
| DSM Local Ltd | Wholesale & retail | 2019 |
| Dtsh Solutions Limited | Administrative & support | 2020 |
| DU Chatelet Ltd | Construction | 2025 |
| Ducoci Builder Ltd | Construction | 2025 |
| Dulieu Builders Limited | Construction | 2017 |
| Dulieu Developments Limited | Construction | 2024 |
| Dulieu Homes Ltd | Construction | 2024 |
| Duncan Labour & Trades Ltd | Administrative & support | 2025 |
| Dusek Limited | Professional & scientific | 2013 |
| Dymd Ltd | Financial services | 2019 |
| Dynamic Design Limited | Professional & scientific | 2001 |
| Dynamic Project Management Ltd | Professional & scientific | 2025 |
| Dynamite Grips Limited | Information & communication | 2025 |
| E-Strategix Limited | Information & communication | 2002 |
| E. Bradshaw Consulting Ltd | Professional & scientific | 2017 |
| E.J.S.Electrical. Limited | Construction | 2014 |
| Ealing Physio Ltd | Health & social care | 2017 |
| Eames Family Holdings Ltd | Professional & scientific | 2022 |
| Eames Horticulture Ltd | Administrative & support | 2021 |
| Early Help Hub CIC | Education | 2026 |
| Earth Productions T/A Berkeley & Brown Limited | Professional & scientific | 2005 |
| EAS GAS Limited | Construction | 2023 |
| EAST2 Technology Ltd | Information & communication | 2019 |
| Eastmore Marketing Limited | Administrative & support | 2006 |
| Eazyplumb Ltd | Construction | 2005 |