| Experience Vintage Events Limited | Huddersfield | 2016 |
| Experienceco Limited | London | 2008 |
| Experienced Audio Ltd. | Northwich | 2019 |
| Experiences Direct Limited | Leicester | 2019 |
| Experiences Everywhere Ltd | Macclesfield | 2022 |
| Experiential Reactive Audiovisual Artists Limited | Redditch | 2016 |
| Experiential/H Limited | Bromsgrove | 2023 |
| Experimental Escape Ltd | Leamington Spa | 2016 |
| Experimental Experience C.I.C. | London | 2014 |
| Expert Death Ltd | London | 2026 |
| Expert Entertainment & Event Solutions Limited | Beckenham | 2016 |
| Expert Fitness Gym Limited | Henley-On-Thames | 2018 |
| Expert Fitness Studios Limited | Henley-On-Thames | 2005 |
| Expert Leisure 1 Limited | Great Yarmouth | 2016 |
| Expial Atrocious Ltd | Dudley | 2023 |
| Explodink Tattoo Ltd | Edinburgh | 2019 |
| Exploits BHS | London | 2023 |
| Explora 2026 Ltd | Bromsgrove | 2026 |
| Explore Activity and Education Centre Limited | Camberley | 2011 |
| Explore Colour Limited | Reading | 2019 |
| Explore Design Ltd | Manchester | 2023 |
| Explore Ensemble Limited | London | 2021 |
| Explore Pilates Ltd | London | 2019 |
| Explorer IAN Motorcycle Tours Limited | Kington | 2016 |
| Explorerjc.Com Limited | Nottingham | 2002 |
| Explorethearch Theatre Company Ltd | St. Leonards-On-Sea | 2017 |
| Exploring Senses Community Interest Company | Brighton | 2011 |
| Explosive Boxing Ltd | Canterbury | 2024 |
| Explosive Entertainments (Worldwide) Ltd | Manchester | 2009 |
| Explosive SFX Limited | Hailsham | 2023 |
| Explosive Solutions Limited | Suffolk | 2008 |
| Exposed Talent Ltd | London | 2026 |
| Exposition Productions Ltd | London | 2022 |
| Exposure Wrestling Academy CIC | Newport | 2026 |
| Expra Music Limited | Greenford | 2018 |
| Express Classes Ltd | Bristol | 2019 |
| Express Leisure (Newark) Limited | Newark | 2003 |
| Express Performing Arts Academy Ltd | Liverpool | 2020 |
| Express Produce Ltd | Sheffield | 2014 |
| Express Signs (Bristol) Ltd | Bristol | 2006 |
| Expressing Scotland CIC | Laurencekirk | 2024 |
| Expression Records Limited | London | 1987 |
| Expression Sound and Lighting Ltd | Liverpool | 2022 |
| Expressions Academy C.I.C. | Hemel Hempstead | 2011 |
| Expressions Cheerleading Academy CIC | Goole | 2023 |
| Expressions LDN Ltd | London | 2025 |
| Expressions Through Art CIC | London | 2025 |
| Expressions TV and Media Productions CIC | London | 2018 |
| Expressive Sounds CIC | Purley | 2023 |
| Exquiseat Events Limited | Harlow | 2018 |
| Exquisite Limited | Bristol | 2024 |
| Exquisite Model Management CIC | London | 2024 |
| Exquisite Pool Ltd | Wishaw | 2017 |
| Exquisite Tours Limited | Bury | 2017 |
| Exquisitive Limited | London | 2021 |
| EXS Management Ltd | Stratford-Upon-Avon | 2013 |
| Exsilium Ltd | Poole | 2023 |
| Exsim Ltd | Swadlincote | 2011 |
| Exsportise Limited | Redhill | 1988 |
| Exspressions Limited | Wolverhampton | 2018 |
| Exsto 361 Ltd | Belfast | 2016 |
| Exsto Apparel Limited | Belfast | 2016 |
| Extant | London | 2004 |
| Extend Dance (London) Ltd | Wallington | 2019 |
| Extension Dance Academy Ltd | Thurnscoe | 2021 |
| Extent Stage Productions Ltd | South Ockendon | 2023 |
| Extnddntwrk Ltd | Burton-On-Trent | 2017 |
| Extour Ltd | London | 2019 |
| Extra Curricular Sports Activities Ltd | Rickmansworth | 1998 |
| Extra Hallam Limited | Newtown | 2025 |
| Extra Mile Athletes Ltd | Doncaster | 2022 |
| Extra Mile Fitness Ltd | Sheffield | 2020 |
| Extra Mile Scholarships Limited | London | 2025 |
| Extra Normal Music Ltd. | Ramsgate | 2017 |
| Extra Time Development Ltd | Kingston Upon Thames | 2022 |
| Extra Time Sports (UK) Ltd | Bedford | 2013 |
| Extra Time Sports Group Limited | Bedford | 2025 |
| Extra Time Sports Management Limited | Formby | 2024 |
| Extra(Ordinary) Women in Enterprise Ltd | London | 2024 |
| Extra-Medium Magazine Ltd | Enfield | 2026 |
| Extracredit Ltd | Halifax | 2025 |
| Extract International Ltd | Hornchurch | 2026 |
| Extrafit Limited | Waterlooville | 2000 |
| Extraordinary Events Ltd | Ross-On-Wye | 2018 |
| Extraordinary Expeditions Limited | Polegate | 2017 |
| Extraordinary US CIC | Coventry | 2022 |
| Extravaganza Productions Ltd | Boston | 2007 |
| Extreeme Ltd | King`S Lynn | 2005 |
| Extreme Amusements Limited | Brighton | 2025 |
| Extreme Bike Battle Ltd | Paignton | 2020 |
| Extreme Challenges and Adventures Ltd | Bristol | 2014 |
| Extreme Conditioning Ltd | Huddersfield | 2013 |
| Extreme Cool Limited | Worcester | 2005 |
| Extreme Dance Company Limited | Lancaster | 2024 |
| Extreme Dance London Ltd | Edgware | 2024 |
| Extreme Duck Racing C.I.C. | Liverpool | 2014 |
| Extreme Energy Limited | Chesham | 2009 |
| Extreme Engineering INT Ltd | Sandhurst | 2014 |
| Extreme Entertainment Limited | London | 2014 |
| Extreme Events Ltd | Ivybridge | 2023 |