| Crosswood Joinery Ltd | Manufacturing | 2011 |
| Crowdpreneur Limited | Administrative & support | 2017 |
| Crown Properties Investment Ltd | Real estate | 2019 |
| Crowned Kids Nursery Limited | Education | 2009 |
| Crystalclearjets Limited | Administrative & support | 2025 |
| CSW Homes Limited | Real estate | 2016 |
| CSW Lettings Limited | Real estate | 2023 |
| CT Scaffolding Services Ltd | Construction | 2020 |
| Curtis-Beard Limited | Administrative & support | 1994 |
| Curve Wake Park Limited | Arts & recreation | 2015 |
| Curve Water Activities CIC | Arts & recreation | 2025 |
| Cushway Limited | Construction | 2018 |
| Célianne Luxury Property Services Limited | Administrative & support | 2025 |
| D & F Engineering Limited | Manufacturing | 2005 |
| D & T Services (UK) Ltd | Transport & logistics | 2013 |
| D and B Roofing Ltd | Construction | 2026 |
| D B Darts Ltd | Wholesale & retail | 2013 |
| D C Transport and Engineering Limited | Construction | 2011 |
| D J Car Sales Limited | Wholesale & retail | 2024 |
| D S Keil Properties Limited | Real estate | 2025 |
| D&L Group Properties Ltd | Real estate | 2025 |
| D&M Drainage Ltd | Professional & scientific | 2025 |
| D&N Pearce Properties Ltd | Real estate | 2025 |
| D.C Elite Cleaners Ltd Ltd | Administrative & support | 2025 |
| D.J. Snell Builders Limited | Construction | 1988 |
| D.Rowe Limited | Construction | 2014 |
| D3 (Essex) Ltd | Other services | 2025 |
| Dailybuy Ltd | Wholesale & retail | 2014 |
| Dairy Diary Limited | Information & communication | 2026 |
| Daisy Elizabeth Health Ltd | Professional & scientific | 2022 |
| Damar Investments Ltd | Financial services | 2021 |
| Damien Madden Architectural Ltd | Professional & scientific | 2026 |
| Dance Fever Promotions Ltd | Arts & recreation | 2022 |
| Dance OFF Events Ltd | Arts & recreation | 2025 |
| Danno Financial Consultants Ltd | Professional & scientific | 2025 |
| Dantha Limited | Administrative & support | 1999 |
| Darren Styles Limited | Information & communication | 2010 |
| Dasilva & Sons Recovery Ltd | Other services | 2023 |
| Dat-Ess Ltd | Construction | 2025 |
| Dataport Comms Ltd | Information & communication | 2018 |
| Dayal Group Ltd | Hospitality | 2015 |
| Dayal Inn Ltd | Hospitality | 2022 |
| Dayla Utilities Ltd | Construction | 2026 |
| DB Inns Limited | Hospitality | 2013 |
| DB Logistics Services Ltd | Transport & logistics | 2016 |
| DC Elite Ltd | Wholesale & retail | 2023 |
| DC Holdings (Essex) Ltd | Real estate | 2023 |
| DE Property and Construction Ltd | Construction | 2024 |
| Dead COW Limited | Information & communication | 2005 |
| Dead Pretty Limited | Information & communication | 2025 |
| Decena Services Limited | Wholesale & retail | 2026 |
| Delk Ltd | Transport & logistics | 2025 |
| Delta Car Service Ltd | Other services | 2018 |
| Deltah Group Ltd | Construction | 2024 |
| Denco (Clacton) Limited | Manufacturing | 1993 |
| Desilt & Drainage Solutions Ltd | Water & waste | 2023 |
| Detaildrive Auto Care Ltd | Wholesale & retail | 2026 |
| DHW Property Group Ltd | Other services | 2021 |
| Diamond Nails & Beauty Clacton Ltd | Other services | 2026 |
| Diamond Nails (Clacton) Ltd | Other services | 2017 |
| Diamondcore Drilling Ltd | Construction | 2021 |
| Didi Metodieva Limited | Health & social care | 2016 |
| Diego Mayor Ltd | Construction | 2020 |
| Dillon Probart Limited | Construction | 2018 |
| Direct Number Plates Ltd | Wholesale & retail | 2024 |
| Discount Windows & Conservatories Ltd | Construction | 2017 |
| Distinctive Heating Limited | Construction | 2022 |
| Distinguished.World Ltd | Administrative & support | 2020 |
| Dlow Construction Ltd | Construction | 2020 |
| DMB Developers Ltd | Construction | 2024 |
| DME Roofing Ltd | Construction | 2018 |
| DMK Windows and Doors Ltd | Construction | 2022 |
| Doctor of Electrics Limited | Construction | 2007 |
| DOE Metal Recycling (Clacton) Limited | Wholesale & retail | 2008 |
| Dolgani Limited | Wholesale & retail | 2022 |
| Dollhaus London Limited | Other services | 2013 |
| DON D Foods Store Ltd | Wholesale & retail | 2024 |
| Donrod Limited | Wholesale & retail | 2022 |
| Doolan Property Investments Ltd | Real estate | 2023 |
| Dough DEN Ltd | Hospitality | 2025 |
| DP GAS Ltd | Construction | 2025 |
| Dragon Inn 999 Ltd | Hospitality | 2024 |
| Dragonfly Property Group Limited | Real estate | 2021 |
| DRC Building & Construction Ltd | Construction | 2025 |
| Dreamy Petz Ltd | Manufacturing | 2018 |
| Dressedtorule Ltd | Wholesale & retail | 2021 |
| Driverdm Ltd | Transport & logistics | 2025 |
| Driving RM Ltd | Extraterritorial | 2019 |
| DRS Essex Ltd | Transport & logistics | 2026 |
| Dryden Freehold Ltd | Real estate | 2025 |
| DT Silvertown Solutions Ltd | Agriculture & fishing | 2025 |
| Duck Soup Designs Ltd | Manufacturing | 2013 |
| Duneshots Regenfi Ltd | Education | 2026 |
| Dura Composites Limited | Manufacturing | 1996 |
| Dura Group Limited | Administrative & support | 2008 |
| Dura Loop Limited | Manufacturing | 2026 |
| Dura Property Limited | Professional & scientific | 1987 |
| Dura Upcycling Limited | Wholesale & retail | 2015 |
| Durecas Ltd | Financial services | 2025 |
| Durley Co (Essex) Ltd | Households | 2022 |