| Echo Performing Arts Academy Limited | London | 2025 |
| Echo Performing Arts CIC | Brighton | 2018 |
| Echo SET Limited | London | 2015 |
| Echo Seven Limited | Glasgow | 2013 |
| Echo Sixty One Events Ltd | Carshalton | 2022 |
| Echo Sports Fitness Limited | Bedford | 2015 |
| Echo Tourism Development and Consulting Ltd | London | 2025 |
| Echo Youth Theatre C.I.C. | Norwich | 2017 |
| ECHO1867 Limited | Rotherham | 2025 |
| ECHO85 Ltd | High Peak | 2025 |
| Echobronze Ltd | Horsham | 2017 |
| Echoclass Limited | | 1985 |
| Echoes Community Studio Ltd | Hull | 2025 |
| Echoes HU International Entertainment Ltd | London | 2019 |
| Echoes of the Orient Ltd | London | 2026 |
| Echoes Paranormal Ltd | Blackburn | 2023 |
| Echoes Productions Ltd | Stockport | 2018 |
| Echoes Theatre Company Limited | London | 1996 |
| Echoliz Records Ltd | Manchester | 2025 |
| Echoplex Films Limited | Bracknell | 2019 |
| Echouktheatre Limited | London | 2025 |
| Echoverse Studios Limited | Ruislip, | 2026 |
| Echoworks Entertainment CIC | Leeds | 2025 |
| ECI Bespoke Solutions Limited | Nottingham | 2017 |
| Ecila Sport Media Ltd | London | 2025 |
| Eckersley & Co Ltd | Manchester | 2023 |
| Eckohaus Limited | Birmingham | 2024 |
| ECL Limited | London | 2008 |
| ECL Modelling Ltd | London | 2016 |
| ECL Play Ltd | London | 2025 |
| Eclectec Ltd | Bradford-On-Avon | 2019 |
| Eclectic Events Ltd | London | 2019 |
| Eclectic EYE Ltd | London | 2018 |
| Eclectic Gallery Limited | London | 2016 |
| Eclectic Music Ltd | Hull | 2022 |
| Eclectica Drindod Limited | Carmarthen | 2005 |
| Eclectric Music Limited | York | 2017 |
| Eclipse Aerial Collective Ltd | Tamworth | 2026 |
| Eclipse Allstars Cheerleading | Crawley | 2019 |
| Eclipse Body Management Ltd | Lydney | 2010 |
| Eclipse Choice Ltd | Nottingham | 2024 |
| Eclipse Choir Limited | Kingston Upon Thames | 2022 |
| Eclipse Elite Twirlers Ltd | Taunton | 2025 |
| Eclipse Entertainment Ltd | London | 2025 |
| Eclipse Gymnastics Centre Limited | Grimsby | 2014 |
| Eclipse Gymnastics CIC | Southampton | 2016 |
| Eclipse Live Limited | London | 2012 |
| Eclipse Media and Entertainment Ltd | Richmond | 2017 |
| Eclipse Muay Thai Ltd | Glasgow | 2025 |
| Eclipse Promotions Ltd | London | 2024 |
| Eclipse Sports Promotions Limited | Hertfordshire | 2004 |
| Eclipse Sports Racing Club Limited | London | 2018 |
| Eclipse Tanning Ltd | Flint | 2023 |
| Eclipse Theatre Company Ltd | Sheffield | 2010 |
| Eclipsed Pilates Ltd | Crowborough | 2026 |
| ECM Creative Ltd | Hertford | 2016 |
| ECM Events Limited | Maldon | 2017 |
| ECM Scenery Ltd | Uxbridge | 2023 |
| Ecml Events Ltd | Glasgow | 2021 |
| ECN Talent Ltd | Biggleswade | 2024 |
| Eco Capital Limited | Ware | 2025 |
| Eco Fitness Ltd | Doncaster | 2012 |
| Eco Ice Rinks Ltd | Shaw / Oldham | 2026 |
| Eco Project Long Lane Limited | Ware | 2026 |
| Eco Skate Ltd | Spalding | 2023 |
| Eco-Padel Ltd | Manchester | 2024 |
| Ecoartsstudio Ltd | London | 2025 |
| Ecocreations Limited | London | 2015 |
| Ecoexito Ltd | Glasgow | 2026 |
| Ecofetes Ltd | London | 2015 |
| Ecole DE Pole Ltd | Romsey | 2024 |
| Ecolibrium Environmental Contracting Ltd | Melksham | 2020 |
| Ecolink Global Ltd | Portsmouth | 2023 |
| Ecoluxe Decor Ltd | Telford | 2024 |
| Econic Ventures Limited | London | 2019 |
| Econostat Limited | London | 2008 |
| Ecosound CIC | Durham | 2025 |
| Ecosse Events Ltd | Broxburn | 2021 |
| Ecosse XC | Dunbar | 2016 |
| ECP Contracts Limited | Chelmsford | 2006 |
| ECR Limited | Oldbury | 2020 |
| ECR Media Productions Limited | Great Yarmouth | 2007 |
| Ecton Brook Wellbeing Centre CIC | Northampton | 2015 |
| Ecuavolley UK Ltd | London | 2026 |
| Ecurie Ecosse 2000 Limited | Stirlingshire | 2000 |
| Ecurie Royal Oak Motor Club Limited | Congleton | 1979 |
| Ecwfc Limited | Exeter | 2024 |
| ED and Sara Limited | Teddington | 2011 |
| ED Andrews Design & Art Direction Ltd | London | 2013 |
| ED Banditt Ltd | Windsor | 2022 |
| ED Bassett Music Limited | London | 2001 |
| ED Bussey Music Ltd | Princes Risborough | 2025 |
| ED Clews Limited | Selby | 2010 |
| ED Curtis Creative Limited | Stratford-Upon-Avon | 2017 |
| ED Dunlop Racing Ltd | Newmarket | 2006 |
| ED Entertainments Limited | Hull | 2006 |
| ED Essex Ltd | London | 2015 |
| ED Event Ltd | Kirkcaldy | 2024 |
| ED Fornieles Studios Ltd | Petersfield | 2018 |
| ED Hamilton Music Editing Ltd | Milton Keynes | 2024 |