| Davidco Solutions Ltd | Wholesale & retail | 2021 |
| Daylight 65 Limited | Administrative & support | 2017 |
| Dazcol Property Services Limited | Real estate | 2017 |
| DB IT Transform Ltd | Professional & scientific | 2020 |
| DBT Ropes and Rigs Ltd | Mining & quarrying | 2022 |
| DC Development (Romford) Ltd | Professional & scientific | 2015 |
| DC Gate Fabrication Limited | Construction | 2024 |
| Dcba Enterprises Ltd | Professional & scientific | 2024 |
| DCK Group Limited | Professional & scientific | 2005 |
| DDC Enterprises Limited | Wholesale & retail | 2022 |
| DE Santis Homes Ltd | Households | 2024 |
| DE Santis Paving Ltd | Administrative & support | 2024 |
| Deal 4 YOU Limited | Administrative & support | 2016 |
| Dean Court Management Ltd | Professional & scientific | 2011 |
| Debbie Rich Limited | Administrative & support | 2010 |
| Deben Holdings Limited | Construction | 1982 |
| Deben Properties Limited | Construction | 1994 |
| Decaisive Limited | Information & communication | 2025 |
| Decibel Hearing Ltd | Professional & scientific | 2019 |
| Declan Clarke Consulting Limited | Administrative & support | 2020 |
| Decorant Limited | Professional & scientific | 2012 |
| Decorant Property Limited | Real estate | 2018 |
| Decorative Surfaces Solutions Ltd | Construction | 2015 |
| Delaware Capital Limited | Financial services | 2018 |
| Delex Services Ltd | Construction | 2016 |
| Delightful Communications Ltd. | Professional & scientific | 2019 |
| Delmar Properties LLP | | 2016 |
| Delt Telecoms Ltd | Information & communication | 2025 |
| Dema Healing Ltd | Health & social care | 2026 |
| Demag Marine Projects Limited | Professional & scientific | 2018 |
| Denna Consulting and Advisory Limited | Professional & scientific | 2026 |
| Denstan Property Maintenance Ltd | Households | 2025 |
| Dermaart Aesthetics Ltd | Other services | 2022 |
| Deroda Limited | Real estate | 2003 |
| Design and Consulting Ltd | Professional & scientific | 2020 |
| Designer Home Fragrances Ltd | Wholesale & retail | 2020 |
| Deuce Property Maintenance Ltd | Construction | 2019 |
| Deus Limited | Transport & logistics | 2025 |
| Devconnect Ltd | Administrative & support | 2026 |
| Devenish Limited | Mining & quarrying | 1932 |
| Devine by Design Limited | Extraterritorial | 2004 |
| Devonshire One Limited | Professional & scientific | 2025 |
| Dexter Tunnelling Services Limited | Professional & scientific | 2017 |
| Dgat Investments Limited | Wholesale & retail | 2024 |
| DGB Consulting Limited | Professional & scientific | 2002 |
| DHR Consultancy Ltd | Professional & scientific | 2019 |
| DHR Heating Ltd | Construction | 2009 |
| Diamond Dents Ltd | Wholesale & retail | 2011 |
| Diamond Oaks Joinery Ltd | Manufacturing | 2026 |
| Diamond Private Hire, Essex Ltd | Transport & logistics | 2023 |
| Diamond Shine Essex Ltd. | Administrative & support | 2016 |
| Diamonds & Monsters Ltd | Information & communication | 2022 |
| Diaspora Investment Group Limited | Administrative & support | 2016 |
| Digital Learning Research Ltd | Information & communication | 2022 |
| Digital Rail Consulting Services Ltd | Construction | 2023 |
| Digital ZOO Ltd | Extraterritorial | 2019 |
| Dignified Homecare Limited | Health & social care | 2011 |
| Dilligaf Haulage Services Limited | Transport & logistics | 2013 |
| DIMI15 Ltd | Construction | 2022 |
| Dingleden Vineyards Limited | Administrative & support | 2010 |
| Direct Import UK Limited | Wholesale & retail | 2007 |
| Direwolf Ltd | Professional & scientific | 2024 |
| DIS 4 U Ltd | Health & social care | 2026 |
| Discount Experts Limited | Professional & scientific | 2016 |
| Diverse Design Solutions Ltd | Professional & scientific | 2014 |
| Divo Group Limited | Professional & scientific | 2022 |
| DJ BOU Limited | Arts & recreation | 2019 |
| DJ Markham & SON Ltd | Real estate | 2025 |
| DJJ Projects Ltd | Construction | 2015 |
| DJL & L Limited | Construction | 2026 |
| DJL Tree Surgery Ltd | Administrative & support | 2025 |
| Djls Estates Limited | Construction | 2026 |
| DJN Communications Limited | Information & communication | 2015 |
| DJP Blue Ltd | Real estate | 2019 |
| DJP Red Ltd | Real estate | 2019 |
| DJP Residential Limited | Real estate | 2016 |
| DJP Yellow Ltd | Real estate | 2019 |
| DJS Porsche Mobile Services Ltd | Wholesale & retail | 2021 |
| DJT Electrical Services Ltd | Construction | 2021 |
| DJU Holding Limited | Financial services | 2020 |
| DK Comms Limited | Construction | 2011 |
| DK Florist Ltd | Wholesale & retail | 2017 |
| DK Lettings & Property Management Limited | Real estate | 2021 |
| DKC Communications Limited | Information & communication | 2015 |
| DL Site Engineering Limited | Construction | 2012 |
| DLN Telecom Limited | Information & communication | 2019 |
| DLW Services Essex Limited | Construction | 2023 |
| DM Commercial Consultants Limited | Professional & scientific | 2026 |
| DM Media Productions Limited | Professional & scientific | 2016 |
| DM Retouching Limited | Construction | 2017 |
| DMJ Althorne Ltd | Construction | 2022 |
| DMO IT Solutions Ltd | Information & communication | 2021 |
| DNM Innovations Limited | Professional & scientific | 2012 |
| DOB Cats Ltd | Wholesale & retail | 2021 |
| Dock Road Electrical Limited | Construction | 2025 |
| Dock Road Interiors Ltd | Construction | 2023 |
| Dockside Fitness Limited | Arts & recreation | 2015 |
| Doctorderma Limited | Health & social care | 2019 |
| Domestic Sprinklers Essex Limited | Manufacturing | 2013 |
| Dominic Harlow Estates Limited | Real estate | 2013 |