| Equitas Legal Limited | Administrative & support | 2018 |
| Equitix Chariot English GP Limited | Financial services | 2019 |
| Equitix Chariot English LP | | 2019 |
| Equitix Cheetah 2021 LLP | | 2021 |
| Equitix Cheylesmore 2021 LLP | | 2021 |
| Equitix Exeter III GP Limited | Real estate | 2016 |
| Equitix Exeter III LP | | 2016 |
| Equitix Exeter III Nominee Limited | Real estate | 2016 |
| Equitix Fire Control (Durham) IV GP Limited | Real estate | 2015 |
| Equitix Fire Control (Durham) IV LP | | 2015 |
| Equitix Fire Control IV (Durham) Nominee Limited | Real estate | 2015 |
| Equitix Fire Control IV GP Limited | Real estate | 2015 |
| Equitix Fire Control IV LP | | 2015 |
| Equitix Fire Control IV Nominee Limited | Real estate | 2015 |
| Equitix Grimsby MA 1 GP Limited | Real estate | 2016 |
| Equitix Grimsby MA 1 LP | | 2016 |
| Equitix Grimsby MA 1 Nominee Limited | Real estate | 2016 |
| Equitix Healthcare (Leeds) Holdings Limited | Financial services | 2009 |
| Equitix Housing 4 Nominee Limited | Real estate | 2015 |
| Equitix Nexus 2021 LLP | | 2021 |
| Equitix Renaissance IV GP Limited | Real estate | 2015 |
| Equitix Renaissance IV LP | | 2015 |
| Equitix Renaissance IV Nominee Limited | Real estate | 2015 |
| Equitix Social Housing (S) IV GP Limited | Real estate | 2016 |
| Equitix Social Housing 4 GP Limited | Real estate | 2015 |
| Equitix Social Housing 4 LP | | 2015 |
| Equitix Tiger English GP Limited | Financial services | 2018 |
| Equitix Tiger English LP | | 2018 |
| Equitix Tiger Limited | Financial services | 2018 |
| Equitix Tiger Nominees Limited | Financial services | 2018 |
| Equity Release Associates Limited | Financial services | 2019 |
| Eqwal Products Limited | Financial services | 2017 |
| ER & GE (UK) Limited | Administrative & support | 1993 |
| ER Entertainment Ltd | Professional & scientific | 2025 |
| ER Healthcare Ltd | Health & social care | 2022 |
| ER Holdings Ltd | Financial services | 2023 |
| ER Installations Limited | Construction | 2022 |
| ER Renovations Ltd | Construction | 2025 |
| Er&Ep Ltd | Real estate | 2019 |
| ER1 Promotions Ltd | Arts & recreation | 2020 |
| Erako Ltd | Administrative & support | 2013 |
| Eranew Limited | Wholesale & retail | 2023 |
| Erbe Medical UK Limited | Manufacturing | 1996 |
| Ercl Limited | Professional & scientific | 2013 |
| ERE Property Holdings Limited | Real estate | 2015 |
| ERE Property Limited | Real estate | 2004 |
| Eres TU Papa Ltd | Information & communication | 2015 |
| Erfan Ltd | Hospitality | 2019 |
| Erfanproperties Ltd | Real estate | 2024 |
| Ergo Counselling and Psychotherapy Ltd | Health & social care | 2016 |
| Ergon Equity Ltd | Real estate | 2023 |
| ERI Red Sea Ltd | Wholesale & retail | 2021 |
| ERI Star Properties Ltd | Real estate | 2023 |
| Eri-Yny Limited | Real estate | 2020 |
| Eric George Limited | Financial services | 2020 |
| Erica & SON Limited | Health & social care | 2019 |
| Erica Jane Limited | Other services | 2011 |
| Erica Marmai Limited | Other services | 2022 |
| Erica Residence Limited | Real estate | 2024 |
| Ericsson Pension Trustee Limited | Financial services | 2011 |
| Erif Investments Limited | Financial services | 2021 |
| Erik Rental Vans Ltd | Transport & logistics | 2023 |
| Erin MAE Limited | Construction | 2017 |
| Erion Plumbing Ltd | Construction | 2016 |
| Eris FX Limited | Financial services | 2004 |
| Erisson Homes Ltd | Real estate | 2025 |
| Erisson Properties Ltd | Real estate | 2025 |
| Eriugena Investments Limited | Financial services | 2017 |
| Eriza Financial Planning Ltd | Administrative & support | 2026 |
| Eriza Ltd | Extraterritorial | 2026 |
| Eriza Wills & Estate Planning Ltd | Other services | 2026 |
| Ernest Bentley & Sons Limited | Wholesale & retail | 1931 |
| Ernest Gunner Holdings Limited | Other services | 1957 |
| Ernest IT Solutions Limited | Administrative & support | 2011 |
| Ernestolorenzo Ltd | Construction | 2021 |
| Ernika Armani Ltd | Real estate | 2025 |
| ERO Homes Ltd | Real estate | 2025 |
| Erobo Ltd | Wholesale & retail | 2025 |
| Erodynamic Training Limited | Arts & recreation | 2023 |
| ERP Solutions Ltd | Information & communication | 2021 |
| Erpadvicecentre Limited | Professional & scientific | 2003 |
| Erre Solutions Limited | Real estate | 2022 |
| Erris Homes (Greetland) Limited | Construction | 2021 |
| Erris Homes (Yorkshire) Limited | Construction | 2009 |
| Erris Homes Limited | Construction | 2009 |
| Erryday Clothing Ltd | Wholesale & retail | 2025 |
| ERS Transition - Trading AS Emed Group Limited | Transport & logistics | 2017 |
| Ersscaffoldingservices Ltd | Construction | 2025 |
| Erteco U.K. Limited | Administrative & support | 1992 |
| Erth Manufacturing Limited | Manufacturing | 2025 |
| Eruss Global Limited | Other services | 2024 |
| ERW Print Finishers Limited | Manufacturing | 2005 |
| ES Developments Ltd | Construction | 2024 |
| ES Health Ltd | Wholesale & retail | 2024 |
| ES Property Management and Lettings Ltd | Real estate | 2024 |
| ES Vinyl and Craft Ltd | Wholesale & retail | 2021 |
| ES2 Family Law Ltd | Information & communication | 2026 |
| ESA Driving School Limited | Administrative & support | 2014 |
| ESA Foundation | Education | 2017 |
| Esafe Global Limited | Information & communication | 2007 |