| Eprocess Limited | Harrow | 2020 |
| Eprocessor Accountants Ltd | Harrow | 2019 |
| EPS Building Services Limited | Bristol | 1986 |
| EPS Fitout Limited | Stevenage | 2011 |
| EPS Interiors Limited | Stevenage | 2011 |
| EPS Management Ltd | Virginia Water | 2015 |
| EPS Transfers Ltd. | Halesworth | 2001 |
| Epsilon 3 Ltd | Salford | 2011 |
| Epsilon Delta Ltd. | Minworth | 2004 |
| Epsilon for Trading & Services Ltd | Manchester | 2026 |
| Epsilon Partitioning Systems Limited | Wetherby | 2001 |
| Epsilon Polymers Limited | Cirencester | 2000 |
| Epsilus Limited | Chichester | 2003 |
| Epsom Assets (NO 2) Limited | Manchester | 2014 |
| Epsom Assets Limited | Manchester | 2014 |
| Epsom Motor Group Limited | Devon | 1982 |
| EPT Services Ltd | Coalville | 2015 |
| Epwin Secretaries Limited | Solihull | 2012 |
| Epworth 1959 Limited | Belfast | 2013 |
| EQ Equip Assist Ltd | Bristol | 2025 |
| EQ Exchange Ltd | York | 2025 |
| EQ Global Limited | London | 2011 |
| EQ Services & Consultancy Limited | Bicester | 2011 |
| EQ Ventures Limited | London | 2015 |
| Eq-Iq Limited | Suffolk | 2003 |
| Eqcul Group Ltd | London | 2025 |
| Eqiewi Limited | Angmering | 2009 |
| Equalfilter Limited | Essex | 1986 |
| Equalmulti Limited | Royston | 1990 |
| Equals Ltd | Rickmansworth | 2009 |
| Equanimity Interiors Limited | Canterbury | 2022 |
| Equans E&S UK Limited | Newcastle Upon Tyne | 2011 |
| Equans Engineering Services Limited | Newcastle Upon Tyne | 1986 |
| Equans Fabricom UK Limited | North East Lincolnshire | 1974 |
| Equans Services Trustee Limited | Newcastle Upon Tyne | 2017 |
| Equem Ltd | London | 2018 |
| Equestrian North East Limited | Crawcrook | 2014 |
| Equi-Sense Limited | Shaftesbury | 1996 |
| Equi-Tex Fashion & Apparels Ltd | London | 2022 |
| Equichic Limited | Coleford | 2011 |
| Equichoice Ltd | Spalding | 2021 |
| Equicon Europe Holding Ltd | York | 2018 |
| Equifest Limited | Huntingdon | 2013 |
| Equilibria Research Limited | London | 2003 |
| Equilibrium Coaching Ltd | Hull | 2009 |
| Equilibrium Designs Limited | Cheltenham | 2017 |
| Equilibrium Holdings Limited | Liss | 2016 |
| Equilius Limited | Watford | 2024 |
| Equine Ambulance Services Ltd | Kington | 2014 |
| Equine Careers Limited | Boston | 2014 |
| Equine Dental Care Limited | Ashford | 2011 |
| Equine Dentistry UK Ltd | Christchurch | 2010 |
| Equine Restore Ltd | Leiston | 2016 |
| Equiniti Solutions Limited | Worthing | 1997 |
| Equinox Accountants Limited | Harrow | 2026 |
| Equinox ARC Limited | London | 2021 |
| Equinox Exhibitions Ltd | Leeds | 2005 |
| Equinoxed Accounting Ltd | Norwich | 2025 |
| Equip Afrique Ltd | London | 2018 |
| Equip Limited | Buxton | 2009 |
| Equipe Limited | Lancing | 2004 |
| Equiply Limited | Lower Darwen | 2023 |
| Equipment Rental Ltd | London | 2025 |
| Equishare Associates Ltd | High Wycombe | 2024 |
| Equisys UK Limited | London | 1998 |
| Equit IT Limited | Bolton | 2013 |
| Equita Recovery & Collections Limited | Dartford | 2008 |
| Equitable 1961 Limited | Halstead | 2014 |
| Equiteach Limited | Gorebridge | 2019 |
| Equitex Export-Import Company Ltd | London | 2022 |
| Equitex Limited | London | 2022 |
| Equities First Europe Limited | London | 2015 |
| Equitique Services Limited | Guildford | 2009 |
| Equitis Limited | London | 2020 |
| Equitivo Limited | Macclesfield | 2018 |
| Equitraka Limited | Lincoln | 2014 |
| Equitum Corporation Limited | London | 2019 |
| Equity 55 Limited | Nottingham | 2021 |
| Equity and Debt Limited | Chatham | 2019 |
| Equity Ltd | London | 2009 |
| Equity Partners Ltd | London | 2004 |
| Equity Peak Investment Limited | Manchester | 2026 |
| Equity Productions Ltd | Bristol | 2015 |
| Equity Providers Limited | Blymhill | 2023 |
| Equity Release Advisor Ltd | Leicestershire | 2021 |
| Equity Release Line Limited | Peterborough | 2017 |
| Equity Release Scotland Limited | Edinburgh | 2017 |
| Equity School Ltd | Bristol | 2011 |
| Equorian Limited | Dumfriesshire | 1987 |
| Equus Environmental Limited | Bury St. Edmunds | 2008 |
| Equus Livery Limited | Stockton-On-Tees | 2014 |
| Equus Publishing Limited | London | 1989 |
| Equus Works Design Limited | Wantage | 2015 |
| ER & Sons Consultancy Ltd | Liverpool | 2024 |
| ER Health Media Ltd | Wakefield | 2018 |
| ER Limited | Saffron Walden | 2007 |
| Er&Der Ltd | London | 2025 |
| ER1C Ltd | Harrogate | 2018 |
| ER1K Limited | Mildenhall | 2022 |
| ERA Group Investment Limited | London | 2024 |