| Datatrak Limited | Information & communication | 2024 |
| Datavation Limited | Information & communication | 1999 |
| Datum Attitude Brewing Co Limited | Manufacturing | 2020 |
| Davcom Limited | Wholesale & retail | 2024 |
| Davenport Installations Limited | Construction | 2008 |
| Davey and Company London Limited | Wholesale & retail | 1910 |
| Davey's Property Limited | Financial services | 2016 |
| Davey's Wholesale Limited | Wholesale & retail | 2002 |
| Davi Lettings Limited | Real estate | 2022 |
| David and Partners Financial Services Limited | Financial services | 2024 |
| David and Partners Limited | Real estate | 2023 |
| David Bros Logistics Ltd | Other services | 2022 |
| David Gibbs Ltd | Professional & scientific | 2006 |
| David JON Doran Limited | Construction | 2016 |
| David Mann Ltd | Construction | 2014 |
| David Martin Mile END Limited | Real estate | 2012 |
| David Oliver Creative Limited | Wholesale & retail | 2011 |
| David Page Associates Limited | Professional & scientific | 2008 |
| David Paul Automotive Ltd | Wholesale & retail | 2015 |
| David Rogers Estate Limited | Households | 2022 |
| David Rose Packaging Solutions Limited | Professional & scientific | 2016 |
| David Ticquet Limited | Agriculture & fishing | 2007 |
| David Watson Transport Limited | Transport & logistics | 2008 |
| Davies & Davies Medical Services Ltd | Health & social care | 2023 |
| Davies & Davies Property Ltd | Real estate | 2025 |
| Davies Management Holdings Co Ltd | Real estate | 2021 |
| Davies Partners Ltd | Professional & scientific | 2019 |
| Davis Simpson & Davis Limited | Manufacturing | 1999 |
| Davis Solutions Limited | Information & communication | 2007 |
| Davonport Furniture Limited | Manufacturing | 2002 |
| Davonport Limited | Wholesale & retail | 2012 |
| Dawid Experts Services Ltd | Transport & logistics | 2019 |
| Dawid Transport Services Ltd | Wholesale & retail | 2020 |
| Dawnford Court Management Limited | Households | 1978 |
| Daws Heath Properties Ltd | Real estate | 2021 |
| Dawson Fairey Communications Limited | Professional & scientific | 1996 |
| Dawsons Way Management Company Limited | Households | 2020 |
| Day-Impex Holdings Limited | Financial services | 2020 |
| Day-Impex Limited | Manufacturing | 1946 |
| Dayball Limited | Hospitality | 2019 |
| Daybar Limited | Construction | 2021 |
| Daybooks Essex Ltd | Administrative & support | 2016 |
| Dayzychain Ltd | Health & social care | 2023 |
| Dazzle and Shine Exterior Cleaning Ltd | Administrative & support | 2021 |
| Dazzle DRY Cleaners Limited | Other services | 2013 |
| DB Attenuation Limited | Professional & scientific | 2001 |
| DB Brickwork and Carpentry Ltd | Construction | 2025 |
| DB Consultation Limited | Professional & scientific | 2007 |
| DB Deputy Services Ltd | Professional & scientific | 2015 |
| DB Farmer Construction Ltd | Construction | 2026 |
| DB Marine (Essex) Ltd | Manufacturing | 2014 |
| DB Partners Ltd | Administrative & support | 2025 |
| DB Prime Logistics Ltd | Transport & logistics | 2026 |
| DBL Contracts Ltd | Construction | 2016 |
| DC BDS Limited | Health & social care | 2025 |
| DC Media Limited | Information & communication | 2022 |
| DC Surfacing Ltd | Construction | 2024 |
| Dc&H Holdings Limited | Professional & scientific | 2011 |
| DC2AC Solutions Ltd | Construction | 2024 |
| DCA Associates Limited | Professional & scientific | 2004 |
| DCB Building Services Ltd | Construction | 2014 |
| DCC Fleming Limited | Professional & scientific | 2019 |
| DCC Surgery Ltd | Professional & scientific | 2023 |
| Dcca Investments Ltd | Professional & scientific | 2014 |
| Dchp Properties Limited | Real estate | 2023 |
| Dcinnovation Cinematography Ltd | Professional & scientific | 2025 |
| DCL DEV Limited | Information & communication | 2013 |
| DCM Associates Ltd | Hospitality | 2017 |
| Dcqs Limited | Professional & scientific | 2012 |
| DD Vehicle Styling Ltd | Wholesale & retail | 2024 |
| Ddbps Limited | Administrative & support | 2020 |
| DE Barra's Ltd | Health & social care | 2020 |
| DE Dancefloors Ltd | Other services | 2019 |
| DE Estate UK Ltd | Real estate | 2015 |
| DE Facto Limited | Professional & scientific | 2023 |
| DE Graaf Poultry UK Ltd | Wholesale & retail | 2021 |
| DE Grey Management Limited | Construction | 2000 |
| DE Grove Limited | Construction | 2024 |
| DE Lara-Bell Properties LLP | | 2012 |
| DE Traders UK Limited | Wholesale & retail | 2023 |
| DE Veres (Earls Colne) Management Limited | Households | 1987 |
| De-Young Consultancy Ltd | Professional & scientific | 2022 |
| Deacs Financial Services Ltd | Construction | 2014 |
| Deacs Track Limited | Construction | 2025 |
| Dead Horse Limited | Professional & scientific | 2026 |
| Dealerbot Limited | Information & communication | 2026 |
| Dealerfleet Ltd | Administrative & support | 2026 |
| Dean Bennell Ltd | Financial services | 2025 |
| Dean J Last Wealth Management Ltd | Financial services | 2011 |
| Deangate Limited | Water & waste | 1995 |
| Deans Cleans Limited | Administrative & support | 2024 |
| Dear Dogs Ltd | Other services | 2025 |
| Debbies Aesthetics Ltd | Other services | 2025 |
| Debeaubien Care Limited | Professional & scientific | 2024 |
| Deben Engineering Consultancy Limited | Information & communication | 2013 |
| Deben Meadows Property Management Ltd | Administrative & support | 2021 |
| Deben Shipping Ltd | Wholesale & retail | 2020 |
| Debenfield Ltd | Financial services | 2020 |
| Debire Limited | Wholesale & retail | 2025 |
| Debit Solutions Limited | Other services | 2023 |