| DJ Harj Limited | Transport & logistics | 2010 |
| DJN Group Holdings Limited | Financial services | 2025 |
| DJN Group Limited | Financial services | 2018 |
| DJN Limited | Manufacturing | 2001 |
| DJS Construction NE Limited | Construction | 2024 |
| DLR Newco Limited | Financial services | 2024 |
| DMG Control Systems Limited | Manufacturing | 1998 |
| Dmkt Couriers Ltd | Transport & logistics | 2022 |
| Dob-Fab Ltd | Professional & scientific | 2021 |
| Dockzen Limited | Information & communication | 2025 |
| Dome Mews Watford RTM Company Limited | Real estate | 2025 |
| Dominic Wilcox Studio Ltd | Information & communication | 2015 |
| Donnelly Capital Ltd | Financial services | 2021 |
| Donwell Chippy Ltd | Hospitality | 2023 |
| Donwell One Chippy Ltd | Hospitality | 2026 |
| Door Supply Limited | Manufacturing | 2021 |
| Download Artwork Limited | Wholesale & retail | 2021 |
| Dreamlane Limited | Wholesale & retail | 2005 |
| Drew Homes Ltd | Real estate | 2023 |
| Drtv Enterprises Ltd | Wholesale & retail | 2022 |
| Drum Stars Ltd. | Education | 2017 |
| DT Security and Risk Management Ltd | Professional & scientific | 2023 |
| DUO Photo Limited | Professional & scientific | 2010 |
| Durham Barbering Limited | Other services | 2019 |
| Durham Events Limited | Hospitality | 2021 |
| Durham Property & Investments Limited | Real estate | 2024 |
| Durham Retail Displays Limited | Manufacturing | 2013 |
| DVC Holdings Limited | Financial services | 2020 |
| DVC Roofing & Building Limited | Construction | 2009 |
| DW Heating Solutions Ltd | Construction | 2022 |
| Dynamic Access and Rigging Solutions Ltd | Construction | 2024 |
| DZ JAZ Ltd | Wholesale & retail | 2013 |
| E & I Solutions Limited | Professional & scientific | 2012 |
| E & J Property Management Limited | Real estate | 2018 |
| E Spoors Roofing & Cladding Services Limited | Construction | 2019 |
| EAB UK, LLC | | 2019 |
| EAJ Group Ltd | Households | 2023 |
| EAR Clear Hearing Care Ltd | Health & social care | 2021 |
| Earlsway Developments Limited | Construction | 2017 |
| Earlsway Estates Ltd | Real estate | 2014 |
| Earsdon Properties LLP | | 2003 |
| East Rainton Cricket Club Limited | Arts & recreation | 2015 |
| East West Property Limited | Real estate | 2020 |
| Eastside Traders Limited | Financial services | 2023 |
| Easy Seal UK Limited | Construction | 2001 |
| Eazi Fit Blinds Online Limited | Wholesale & retail | 2024 |
| Eco Energy Innovation and Management Ltd | Administrative & support | 2025 |
| Eco Funding for Homes Ltd | Construction | 2022 |
| Eco Home Improvements Ltd | Construction | 2011 |
| Eddison Chef Limited | Hospitality | 2024 |
| Eden Piling Services Ltd | Construction | 2020 |
| Edu-Sci Ltd | Wholesale & retail | 2006 |
| Edway Property Group Limited | Real estate | 2024 |
| EDY Trans 2015 Ltd | Transport & logistics | 2018 |
| EFS Fire Solutions Ltd | Construction | 2024 |
| EI. WHS Limited | Extraterritorial | 2013 |
| EIG Energy Fund XIV (Scottish Feeder), L.P. | | 2007 |
| EIG Energy Fund XVI (Scotland), L.P. | | 2013 |
| EIG Energy Fund Xvii (Scotland), L.P. | | 2017 |
| EIG Energy Investors XV (Scotland), L.P. | | 2010 |
| EIG Energy Xvii Holdings (Breakwater), L.P. | | 2023 |
| EIG Energy Xvii Holdings (Matador), L.P. | | 2023 |
| EIG Energy Xvii Holdings (Scotland), L.P. | | 2023 |
| EIG ETF Investments, L.P. | | 2022 |
| EIG Fidra Energy Aggregator, L.P. | | 2024 |
| EIG Fidra Energy, L.P. | | 2024 |
| EIG Fund Xviii-A (Scotland), L.P. | | 2022 |
| EIG Fund Xviii-B (Scotland), L.P. | | 2022 |
| EIG Olivares Aggregator, L.P. | | 2022 |
| EIG Sunray Co-Investment, L.P. | | 2023 |
| Electric Vehicle Systems Limited | Manufacturing | 1980 |
| Eleven Eleven Limited | Arts & recreation | 2026 |
| Elite Doner Kebabs Ltd | Hospitality | 2020 |
| Elite EV & Electrical Solutions Ltd | Construction | 2024 |
| Elite Learning Opportunities Ltd | Education | 2024 |
| Elite PE and Wellbeing Ltd | Education | 2021 |
| Elite Precision Engineering Limited | Manufacturing | 2009 |
| Elite Property Acumen Ltd | Real estate | 2016 |
| Elite Property Holdings (North East) Ltd | Other services | 2020 |
| Elite Property Power Ltd | Real estate | 2019 |
| Elite Recruitment Executive Ltd | Wholesale & retail | 2018 |
| Elite Science Tutoring Limited | Education | 2018 |
| Eliteautoplates Ltd | Manufacturing | 2025 |
| Elliott NE Services Ltd | Professional & scientific | 2025 |
| ELM Tree Farm Garden Centre Ltd | Agriculture & fishing | 2025 |
| ELM Tree Farm Garden Nursery Limited | Agriculture & fishing | 2012 |
| ELM Tree Farm Tea Room Limited | Hospitality | 2016 |
| Emmerce Ltd | Wholesale & retail | 2024 |
| Encore Envelopes Limited | Professional & scientific | 2000 |
| Encore Packaging Solutions Limited | Professional & scientific | 2013 |
| Encore Print Solutions Limited | Professional & scientific | 1998 |
| END Holdco UK Limited | Financial services | 2024 |
| END. Clothing Limited | Wholesale & retail | 2016 |
| Energy Procurement Group Limited | Administrative & support | 2020 |
| Energy Professionals Group Limited | Administrative & support | 2017 |
| Enlighting Limited | Construction | 2010 |
| Envelope World Limited | Professional & scientific | 2001 |
| Envirowatch Limited | Administrative & support | 2009 |
| Epsilon Inspections Ltd | Construction | 2013 |
| EQL Brand Ltd | Wholesale & retail | 2026 |