| Dcsa (Essex) Limited | Wholesale & retail | 2017 |
| DD Autoserve Limited | Wholesale & retail | 2012 |
| DD IPS Limited | Hospitality | 2025 |
| DD Smart Ltd | Transport & logistics | 2025 |
| DDR Paper Products Limited | Wholesale & retail | 2025 |
| DDS Property Ltd | Real estate | 2024 |
| DE Burgh Developments (UK) Limited | Construction | 2002 |
| DE Facto Software Limited | Information & communication | 1989 |
| DE Lege Limited | Professional & scientific | 2012 |
| DE Sudor Investigations Limited | Administrative & support | 2013 |
| De-Luxe Professional Hand Car Wash Ltd | Other services | 2024 |
| Deaco Logistic Ltd | Transport & logistics | 2017 |
| Dealing Direct Solutions Limited | Financial services | 2015 |
| Dealspire Ltd | Wholesale & retail | 2025 |
| Dean Catling (Electrical) Limited | Construction | 2002 |
| Dean Commercial Limited | Administrative & support | 2014 |
| Dean Hopkins Limited | Construction | 2005 |
| Deasy & Pearl Roofing Limited | Construction | 2007 |
| Deasy Property Investments Ltd | Real estate | 2025 |
| Debach Enterprises Limited | Transport & logistics | 1980 |
| Deben Agronomy Ltd | Agriculture & fishing | 2018 |
| Deben Boatyard Holdings Limited | Manufacturing | 2025 |
| Deben Body Repairs Limited | Wholesale & retail | 2003 |
| Deben Boilers Ltd | Construction | 2010 |
| Deben Commercial Finance Limited | Professional & scientific | 2022 |
| Deben Construction Limited | Construction | 2017 |
| Deben Contracts Limited | Other services | 2016 |
| Deben Development Ltd | Real estate | 2022 |
| Deben Diagnostics Limited | Wholesale & retail | 2009 |
| Deben Floors Ltd | Wholesale & retail | 2014 |
| Deben Forestry Ltd | Administrative & support | 2005 |
| Deben Frames Limited | Manufacturing | 2003 |
| Deben Global Logistics Limited | Transport & logistics | 2024 |
| Deben Groundwork Solutions Ltd | Construction | 2020 |
| Deben Horticulture Solutions Ltd | Agriculture & fishing | 2017 |
| Deben Laboratory Supplies Limited | Wholesale & retail | 2021 |
| Deben Mill Business Centre Management Company Limited | Professional & scientific | 2004 |
| Deben Technologies Limited | Information & communication | 2024 |
| Deben Transport Limited | Transport & logistics | 1986 |
| Deben Valley Developments Ltd | Real estate | 2021 |
| Deben Valley Self Storage Limited | Real estate | 2025 |
| Deben Vehicle Repairs Limited | Wholesale & retail | 2003 |
| Deben Willow Care Limited | Health & social care | 2015 |
| Debenham Hall Farms Limited | Agriculture & fishing | 1964 |
| Debenwood Financial Planning Ltd | Financial services | 2010 |
| Debjos Healthcare Limited | Health & social care | 2017 |
| Decent Decoration Services Ltd | Construction | 2022 |
| Decipher Innovation Limited | Information & communication | 2018 |
| Decisiv Ltd | Transport & logistics | 2019 |
| Deck World Limited | Wholesale & retail | 2001 |
| Decode Trading Ltd | Financial services | 2024 |
| Decorateuk.Com Limited | Construction | 2012 |
| Decorator IPS Ltd | Construction | 2020 |
| Decoveo Limited | Information & communication | 2023 |
| Decrystal Ltd | Administrative & support | 2026 |
| Dedham Vale Business Centre (Management) Limited | Real estate | 2007 |
| Dedham Vale Holdings Ltd | Financial services | 2024 |
| Dedy Ltd | Transport & logistics | 2022 |
| Deea T.V.X UK Ltd | Transport & logistics | 2017 |
| Deeanton Ltd | Transport & logistics | 2022 |
| Deej Property Ltd | Real estate | 2018 |
| Deelishus Catering Ltd | Hospitality | 2012 |
| Deemed Ltd | Health & social care | 2022 |
| Deenify Ltd | Wholesale & retail | 2025 |
| Deepblue Associates Limited | Financial services | 2020 |
| Deepblue ROV Ltd | Mining & quarrying | 2025 |
| Deerex Ltd | Manufacturing | 2026 |
| Deesign Dog Arts Limited | Wholesale & retail | 2019 |
| DEF Construction (Ipswich) Ltd | Construction | 2025 |
| Defensive Security Limited | Information & communication | 2008 |
| Defib UK Limited | Other services | 2014 |
| Defining Milestones Limited | Wholesale & retail | 2025 |
| Dehoopsmoto Limited | Wholesale & retail | 2017 |
| Delegate One Limited | Administrative & support | 2010 |
| Delen Auto Ltd | Wholesale & retail | 2022 |
| Delicious Film Catering Ltd | Hospitality | 2012 |
| Delish Restaurant Limited | Hospitality | 2012 |
| Delivery BG Ltd | Transport & logistics | 2020 |
| Delnico Ltd | Construction | 2020 |
| Delta Juliette Charlie Properties Ltd | Financial services | 2021 |
| Delta Property Enterprise Ltd | Real estate | 2022 |
| Delta Risk Management Ltd | Administrative & support | 2025 |
| Delta Secretariat Limited | Administrative & support | 2002 |
| Delta Special Care Ltd | Health & social care | 2016 |
| Deltabus Ltd | Transport & logistics | 2026 |
| Deltanext Limited | Information & communication | 2025 |
| Deltasoft Limited | Information & communication | 1987 |
| Deltatrans Group Ltd | Transport & logistics | 2022 |
| Deluxe Charms Ltd | Wholesale & retail | 2022 |
| Deluxe Metalwork Limited | Manufacturing | 2008 |
| Deluxe Resto Shop Limited | Wholesale & retail | 2013 |
| DEM and DEO Solutions Ltd | Transport & logistics | 2025 |
| Dema Accountancy Ltd | Professional & scientific | 2015 |
| Demand Engineering Limited | Manufacturing | 2011 |
| Demolly Company Limited | Construction | 2018 |
| DEN Mountain Publishing Limited | Information & communication | 2021 |
| Denis Gabriel Construction Ltd | Construction | 2023 |
| Deniz (EN) Ltd | Hospitality | 2017 |
| Dennis Denny Investments Ltd | Extraterritorial | 2017 |
| Dennis Denny Ltd | Real estate | 2009 |