| ET Art - EVA Trabszo Ltd | London | 2018 |
| ET Pole Limited | Liverpool | 2022 |
| ET Sports Ltd | Billericay | 2021 |
| ET Sports Management Limited | Cardiff | 2003 |
| ET Ventures Ltd | Oldham | 2008 |
| ET7 Ltd | Formby | 2021 |
| Etage London Ltd | London | 2025 |
| Etapuwa Limited | London | 2025 |
| ETC Records Limited | London | 2017 |
| ETC Touring Limited | London | 2012 |
| ETC Training & Games Limited | Cardiff | 2026 |
| Etca Media Ltd | Sheffield | 2020 |
| Etcetera Sunetra Productions Ltd | London | 2014 |
| Etch & CUT Ltd | Blackpool | 2020 |
| Etch Attic Ltd | London | 2008 |
| Etch Audio Limited | Brighton | 2021 |
| Etch Entertainment Ltd | London | 2024 |
| Etch Limited | Lewes | 2003 |
| Etched in Glass Colourworks Ltd | Ashford | 2015 |
| Eterna Wellness LAB Ltd | East Grinstead | 2025 |
| Eternal 12 Films Ltd | London | 2025 |
| Eternal Athletic Ltd | Beckenham | 2023 |
| Eternal Dance Media Limited | London | 2011 |
| Eternal Embroidery Limited | Loughborough | 2015 |
| Eternal Fitness Coach Ltd | Harrow | 2018 |
| Eternal Harmony Ltd | West Bromwich | 2024 |
| Eternal Hope Ltd | Blackwood | 2023 |
| Eternal Light Music Limited | East Grinstead | 2012 |
| Eternal Magic Touring Limited | London | 2015 |
| Eternal Sound Production Ltd | Birmingham | 2025 |
| Eternal Soup Ltd | London | 2023 |
| Eternal Voiceovers Ltd | Wisbech | 2023 |
| Eternal Wedding Decor Ltd | Uxbridge | 2023 |
| Eternia Ltd | Northampton | 2021 |
| Eternity Productions Limited | London | 2006 |
| Eternity Tattoo Studio Ltd | Sutton-In-Ashfield | 2018 |
| Etfc Ltd | Enfield | 2001 |
| Ethan 17 Limited | Southsea | 2019 |
| Ethan Salm Coaching Limited | Sowerby Bridge | 2024 |
| Ethannn Limited | Orpington | 2026 |
| Etharla Entertainments Ltd | Newry | 2025 |
| Ethel (One) Limited | London | 2022 |
| Ethel Dares (Aviation) Limited | London | 2022 |
| Ethel Dares Group Limited | London | 2022 |
| Ethel Rose Limited | Dorchester | 2020 |
| Ethel Walker Ltd | Tarbert | 2003 |
| Etherbriar Limited | Newthorpe | 1992 |
| Ethereal Colour Artistry Limited | Stockport | 2025 |
| Ethereal Image Limited | St. Helens | 2025 |
| Ethereal Maison Limited | London | 2025 |
| Ethereal Solutions Limited | Colchester | 2022 |
| Etherton Enterprises Limited | London | 2021 |
| Ethical Festival Ltd | Loughborough | 2013 |
| Ethical Fitness Ltd | Eastbourne | 2018 |
| Ethical Productions Ltd | Bridport | 2025 |
| Ethics Leisure Ltd | Wilmslow | 2013 |
| Ethik Creative Studios Ltd | Petworth | 2022 |
| Ethiopian Athletes UK Limited | London | 2023 |
| Ethiro Productions Limited | London | 1957 |
| Ethno VOX Limited | London | 2006 |
| Ethnostar Union Limited | Kington | 2025 |
| Ethos Cheshunt Ltd | Barnet | 2026 |
| Ethos Collective Ltd | Edgware | 2021 |
| Ethos Design & Decor Ltd | London | 2016 |
| Ethos Gym Limited | London | 2020 |
| Ethos Health & Fitness Limited | Newcastle Upon Tyne | 2005 |
| Ethos Hertford Ltd | Barnet | 2026 |
| Ethos Hoddesdon Ltd | London | 2026 |
| Ethos I.T. Limited | Poole | 2014 |
| Ethos Jiujitsu Barnet Ltd | Waltham Cross | 2025 |
| Ethos Wellbeing Ltd | Fleet | 2026 |
| Ethos Yoga Limited | Holywood | 2022 |
| ETI Group Holdings Limited | Hythe | 2004 |
| ETI Group Limited | Hythe | 2003 |
| Etim Arts Limited | London | 2018 |
| Etinon Touring Limited | London | 2022 |
| Etiquette Studio Ltd | London | 2025 |
| Eton Community CIC | Windsor | 2019 |
| Eton Manor Rugby Football Club 1928 Bar Subsidiary Limited | Billericay | 2021 |
| Eton Manor Rugby Football Club 1928 Limited | Billericay | 2021 |
| Eton Manor Rugby Football Club Limited | Billericay | 1995 |
| Eton Mission Rowing Club Limited | London | 1998 |
| ETON66 Design Limited | Woodbridge | 2006 |
| Etpf UK Ltd | Huddersfield | 2025 |
| ETR Music Ltd | Worthing | 2025 |
| ETR Sport Ltd | Northampton | 2025 |
| Etruria Industrial Museum | Newcastle | 2011 |
| ETS Events Ltd | Newbury | 2020 |
| ETT Industries Limited | Norwich | 2015 |
| Ettecon Limited | Deal | 2019 |
| Ettg Holdings Limited | Manchester | 2024 |
| Ettie a Holland Ltd | North Shields | 2018 |
| Etto Productions Ltd | Darlington | 2021 |
| Ettore Bugatti Automobiles Limited | Cheltenham | 1977 |
| Etwall Alpacas Limited | Nottingham | 2021 |
| Etwall Cricket Club Trustees Ltd | Etwall | 2017 |
| EU Tickets Limited | London | 2016 |
| Euan Hankey Motor Sport Limited | Tiverton | 2005 |
| Euan Lawrence Ltd | Edinburgh | 2022 |
| Euclid Trading Limited | Dundee | 2009 |