| Enerserv Limited | Professional & scientific | 2011 |
| Enersights Limited | Professional & scientific | 2025 |
| Enertech Completions Limited | Mining & quarrying | 2026 |
| Enertech Synergies Ltd. | Professional & scientific | 2014 |
| Enes North Sea Limited | Mining & quarrying | 2007 |
| ENG Resources Ltd | Other services | 2010 |
| Engage Offshore Ltd | Professional & scientific | 2023 |
| Engage PR Limited | Professional & scientific | 2008 |
| Engage Talent Partners Ltd | Administrative & support | 2018 |
| Engect Limited | Extraterritorial | 2017 |
| Engending Ltd | Professional & scientific | 2018 |
| Engineering Artisan Ltd | Professional & scientific | 2020 |
| Engineering Innovation & Design Limited | Mining & quarrying | 2003 |
| Engineering Insights Limited | Mining & quarrying | 1998 |
| Engineeringpals Ltd | Manufacturing | 2025 |
| Enhanced Drilling UK Ltd | Administrative & support | 2014 |
| Enhanced Hybrid Geothermal Ltd | Professional & scientific | 2025 |
| ENI Hewett Limited | Mining & quarrying | 1984 |
| ENI in Amenas Limited | Mining & quarrying | 1991 |
| ENI TNS Limited | Mining & quarrying | 1974 |
| Enigma Expansion Services Limited | Administrative & support | 2017 |
| Enigma Project Resolution Consulting Limited | Professional & scientific | 2014 |
| Enjoy Group Ltd | Wholesale & retail | 2019 |
| ENK Commercial Ltd | Administrative & support | 2025 |
| Enko Developments Limited | Real estate | 2019 |
| Enko Engineering Limited | Other services | 2011 |
| Enlim Properties Ltd | Real estate | 2025 |
| Enneco Ltd | Mining & quarrying | 2020 |
| Enovate Systems Limited | Administrative & support | 2001 |
| Enovateq Limited | Professional & scientific | 2019 |
| Enrg Dynamic Operational Consultancy Ltd | Professional & scientific | 2025 |
| Ensco 243 Limited | Construction | 2008 |
| Ensco 307 Limited | Construction | 2010 |
| Ensco 330 Limited | Construction | 2010 |
| Ensco 367 Limited | Construction | 2011 |
| Enship Limited | Extraterritorial | 2004 |
| Ensonify Limited | Professional & scientific | 2022 |
| Enspire Property Investments Limited | Professional & scientific | 2021 |
| Entergaia Technologies Ltd | Manufacturing | 2018 |
| Enteron Services Ltd | Professional & scientific | 2012 |
| Enterprise North East Trust Limited | Other services | 2001 |
| Enterprise Ship Stores Limited (the) | Professional & scientific | 1972 |
| Entertainment Technology Ltd | Manufacturing | 2017 |
| Entrion Wind UK Limited | Professional & scientific | 2026 |
| Entropic Management Consultants Ltd | Professional & scientific | 2024 |
| Enventure International (UK) Limited | Mining & quarrying | 2018 |
| Envertiz Academy Ltd | Education | 2023 |
| Envertiz Consultancy Limited | Information & communication | 2014 |
| Envertiz Group Ltd | Financial services | 2021 |
| Envertiz Housing Ltd | Real estate | 2020 |
| Envertiz International Limited | Administrative & support | 2020 |
| Envertiz Training Ltd | Education | 2025 |
| Environmental Consultancy Services Ltd | Professional & scientific | 2021 |
| Environmental Processes Limited | Administrative & support | 2005 |
| Envirovolt Renewables Limited | Professional & scientific | 2025 |
| Envisage INNOV8 Limited | Professional & scientific | 2024 |
| Envolve Ventures Limited | Professional & scientific | 2026 |
| Envoy & Partners Limited | Administrative & support | 2018 |
| Envoy Capital Management Limited | Administrative & support | 2015 |
| Envoy Estates Holdings I Limited | Financial services | 2026 |
| Envoy Estates Limited | Administrative & support | 2023 |
| Envoy Group Holdings Limited | Administrative & support | 2022 |
| Envoy Growth Partners Limited | Administrative & support | 2022 |
| Envoy Investco I Limited | Financial services | 2026 |
| Envoy Pathways Limited | Financial services | 2026 |
| Envoy Trading Group Limited | Financial services | 2026 |
| Envtech UK Ltd | Other services | 2022 |
| Enzco Ltd | Professional & scientific | 2023 |
| Eodex Caledonian Ltd | Professional & scientific | 2022 |
| EOS Technix Limited | Mining & quarrying | 2018 |
| EP Communications Ltd | Professional & scientific | 2025 |
| Epalanga Ltd | Hospitality | 2023 |
| EPC Consulting Ltd | Professional & scientific | 2018 |
| EPC Management Ltd | Professional & scientific | 2025 |
| Epcb Limited | Professional & scientific | 2012 |
| Epeus Limited | Administrative & support | 2002 |
| Epeus Management Limited | Administrative & support | 2009 |
| Epic Leisure Aberdeen Ltd | Hospitality | 2024 |
| Epic Properties (Scot) Ltd | Real estate | 2024 |
| Epic Property Services Ltd | Other services | 2018 |
| Epic Subsea Limited | Professional & scientific | 2019 |
| Epidote Holdings Limited | Mining & quarrying | 2012 |
| Epidote Limited | Information & communication | 1999 |
| Epinoia Ltd | Professional & scientific | 2025 |
| Epit Group Limited | Other services | 2011 |
| Epitychia Consulting Services Ltd | Professional & scientific | 2021 |
| Epsilon Energy Solutions Ltd | Mining & quarrying | 2018 |
| Epsilon Experts Limited | Professional & scientific | 2005 |
| Epsilon Geoscience Ltd | Professional & scientific | 2021 |
| Eqobrush Limited | Manufacturing | 2019 |
| Equinus Ltd | Professional & scientific | 2012 |
| Equipoise Energy Limited | Professional & scientific | 2021 |
| Equipshift Ltd | Manufacturing | 2018 |
| Equity Lighthouse Ltd | Education | 2024 |
| Equiworld Club Limited | Administrative & support | 2002 |
| ER Physiotherapy Ltd | Health & social care | 2022 |
| Eranders Ltd | Wholesale & retail | 2024 |
| Erbil Repair Limited | Other services | 2019 |
| Eriaid Limited | Professional & scientific | 2023 |
| Ericstef Ltd | Transport & logistics | 2019 |