| Crevar Limited | Hospitality | 2011 |
| Crew Trade Limited | Wholesale & retail | 2001 |
| Croft Homes Limited | Construction | 1978 |
| Crofton Capital Partners Ltd | Financial services | 2024 |
| Crown Barber 27 Ltd | Other services | 2026 |
| Crystal Diamond Events | Arts & recreation | 2011 |
| CTL Services Ltd | Administrative & support | 2026 |
| Cunningham Essex Limited | Real estate | 2024 |
| Curran Communications Ltd | Professional & scientific | 2018 |
| Currentvolt Electrical Ltd | Construction | 2026 |
| Curtis Metal Designs Limited | Construction | 2006 |
| Cutting Edge Software Limited | Information & communication | 1993 |
| Cutting Edges Contract Maintenance Limited | Administrative & support | 2002 |
| Cybersquad Kids Ltd | Education | 2023 |
| CYK Epping Ltd | Hospitality | 2026 |
| D O Rail Consultancy Ltd | Administrative & support | 2020 |
| D W M Motors Limited | Wholesale & retail | 2022 |
| D&C Property Investors Ltd | Financial services | 2024 |
| D.P.L Construction Limited | Construction | 2018 |
| Daav Trading UK Ltd | Hospitality | 2025 |
| Dale Carpentry Ltd | Construction | 2018 |
| Daletrent Limited | Real estate | 2002 |
| Damfino Productions Ltd | Arts & recreation | 2020 |
| Dan-Tex Vapes Ltd | Wholesale & retail | 2025 |
| Daniel James Services Limited | Transport & logistics | 2018 |
| Danleigh Consulting Ltd | Professional & scientific | 2009 |
| Dapper Pet Products Ltd | Wholesale & retail | 2012 |
| Dash Q Ltd | Information & communication | 2015 |
| Dasiem Ltd | Wholesale & retail | 2022 |
| Daylighting Limited | Administrative & support | 2009 |
| Dcsr Limited | Administrative & support | 2002 |
| DE Juan Englund Investments Ltd | Real estate | 2020 |
| DE Souza Enterprises Limited | Real estate | 2013 |
| Deadloss Properties Limited | Real estate | 1992 |
| Dean FOX Illustration Limited | Arts & recreation | 2014 |
| Dear Health Care Ltd | Health & social care | 2024 |
| Decent Properties Limited | Professional & scientific | 2014 |
| Decent Roofing Ltd | Construction | 2014 |
| Delacroix Jewellery Limited | Manufacturing | 2019 |
| Delara Stretch Tents Ltd | Administrative & support | 2026 |
| Deltabridge Limited | Information & communication | 2018 |
| Deltx Ltd | Construction | 2015 |
| Demens Felis Limited | Hospitality | 2019 |
| Demetriou Property & Asset Management Limited | Real estate | 2016 |
| Dent FX Ltd | Wholesale & retail | 2024 |
| Dermar Holdings Limited | Real estate | 2015 |
| Design & Print Limited | Manufacturing | 1995 |
| Desire Avenue Limited | Wholesale & retail | 2021 |
| Dets Estate Ltd | Real estate | 2024 |
| Dextro AI Limited | Information & communication | 2025 |
| DI Tecco Engineering Limited | Professional & scientific | 2024 |
| Digital Mailing Solutions Limited | Administrative & support | 2017 |
| Digital Pathways Limited | Information & communication | 1996 |
| Digital Swift Ltd | Information & communication | 2022 |
| Digitec Security Limited | Administrative & support | 2014 |
| Dinu Real Estate Limited | Real estate | 2025 |
| Diptimantam Ltd | Wholesale & retail | 2019 |
| Dire Wolf International Ltd | Administrative & support | 2018 |
| Dixon & French - Landscaping & Property Services Ltd | Construction | 2023 |
| DJM Electrical Installations Limited | Energy | 2016 |
| DJW Travel Ltd | Administrative & support | 2026 |
| DKF Developments Ltd | Construction | 2021 |
| Dkma Ltd | Information & communication | 2019 |
| DLJ Lighting Limited | Information & communication | 2022 |
| Dmcindustries Ltd | Wholesale & retail | 2023 |
| DMI Security Group Limited | Manufacturing | 2010 |
| DNC Legal Limited | Professional & scientific | 2023 |
| Dolls House Days Limited | Wholesale & retail | 2024 |
| Domi Projects Ltd | Construction | 2025 |
| Domivid Ltd | Administrative & support | 2026 |
| Doug Hunt Sound & Light Limited | Administrative & support | 2011 |
| DOW Operations Ltd | Hospitality | 2025 |
| Dower House Investments Ltd | Real estate | 2020 |
| Down to Science Limited | Wholesale & retail | 2016 |
| DP Fire Alarm Systems Inst. Ltd | Construction | 2025 |
| DPX74 Ltd | Real estate | 2017 |
| DR Gadgets Epping Ltd | Wholesale & retail | 2024 |
| Driveline Logistics Limited | Transport & logistics | 2025 |
| Driveline Vehicle Diagnostics Limited | Wholesale & retail | 2026 |
| DRO Surveying & Consultancy Ltd | Professional & scientific | 2024 |
| Dronetor Limited | Professional & scientific | 2018 |
| DSN Creative Design Ltd | Professional & scientific | 2025 |
| Duldzin Dragpa Kadampa Buddhist Centre | Other services | 2008 |
| Duma Construction Ltd | Construction | 2013 |
| Duraan Ltd | Wholesale & retail | 2025 |
| DV Beauty & Clinic Ltd | Wholesale & retail | 2025 |
| Dwhr Ltd | Administrative & support | 2019 |
| Dworniak Music Limited | Other services | 1989 |
| Dynamic Springs UK Limited | Manufacturing | 2011 |
| E & M Building & Decorating Ltd | Construction | 2010 |
| E.E.C. (UK) Limited | Other services | 2003 |
| E15 Airspace Ltd | Construction | 2025 |
| Eagle Automation Systems Limited | Construction | 1997 |
| Eagle Motion Engineering Ltd | Manufacturing | 2023 |
| East London Capital Investments Ltd | Real estate | 2017 |
| East London Property Investment Management Ltd | Real estate | 2014 |
| East Seven Properties Limited | Real estate | 2005 |
| Easy Waste Clearance Ltd | Water & waste | 2021 |
| EAT Nourish and Glow Ltd | Health & social care | 2021 |
| EAW Logistics Limited | Wholesale & retail | 2019 |