| Exlisville Holding Ltd | Financial services | 2025 |
| Exluvera Ltd | Wholesale & retail | 2025 |
| Exodus HOS Ltd | Professional & scientific | 2025 |
| Exodus Market Research & Strategic Planning Ltd | Professional & scientific | 2002 |
| Exoflo Limited | Administrative & support | 2022 |
| Exon One Limited | Education | 2015 |
| Exonums.Com Ltd | Other services | 2024 |
| Exoplanet Ltd | Wholesale & retail | 2020 |
| Exora Global Ltd | Wholesale & retail | 2025 |
| Exorate Ltd | Information & communication | 2025 |
| Exorion Business Ltd | Wholesale & retail | 2025 |
| Exoshell UK Ltd | Wholesale & retail | 2018 |
| Exoshock Limited | Information & communication | 2015 |
| Exotic Villas Ltd | Financial services | 2020 |
| Exotica Cardiff Ltd | Wholesale & retail | 2018 |
| Expand & Build Ltd | Construction | 2021 |
| Expand Assets Global Limited | Financial services | 2021 |
| Expand Digital Media Limited | Information & communication | 2017 |
| Expect Results Agency Ltd | Professional & scientific | 2019 |
| Expedian Limited | Administrative & support | 2020 |
| Expedite Building Services (Wales) Limited | Administrative & support | 2024 |
| Expedite Design Services Limited | Administrative & support | 2014 |
| Expedite Engineering Services Ltd | Administrative & support | 2015 |
| Expedite Holding Group Ltd | Financial services | 2016 |
| Expedite Planning Limited | Administrative & support | 2023 |
| Expedite Project Services Limited | Administrative & support | 2013 |
| Expedite Tax Depreciation Limited | Professional & scientific | 2019 |
| Expedited Machining Co., Ltd | Manufacturing | 2025 |
| Expedition Group Ltd | Wholesale & retail | 2018 |
| Expedition Roofing UK Limited | Construction | 2021 |
| Expedition Tours Ltd. | Administrative & support | 2018 |
| Experience Away Ltd | Hospitality | 2024 |
| Experience Bars Ltd | Hospitality | 2020 |
| Experimental Science Ltd | Education | 2024 |
| Expermedia Ltd | Other services | 2025 |
| Expert Agence LLP | | 2023 |
| Expert Cargo Limited | Transport & logistics | 2025 |
| Expert Cover Ltd | Other services | 2022 |
| Expert Orthotists Ltd | Health & social care | 2022 |
| Expert Property Maintenance Limited | Construction | 2021 |
| Experticom Ltd | Information & communication | 2013 |
| Expertlevel Ltd | Wholesale & retail | 2024 |
| Experts&Talents Ltd | Transport & logistics | 2025 |
| Expertus Britannia Cyfyngedig | Professional & scientific | 2005 |
| Explaw Consulting Ltd | Administrative & support | 2014 |
| Explore Campers Ltd | Administrative & support | 2025 |
| EXPLOREWITHUS2K23 Limited | Administrative & support | 2024 |
| Expo'R WAL Goch C.B.C. | Administrative & support | 2020 |
| Expoflow Ltd | Wholesale & retail | 2021 |
| Export Drinks Ltd | Professional & scientific | 2021 |
| Export Trading Group Limited | Administrative & support | 2019 |
| Exposcale Consulting LLP | | 2025 |
| Expremental Ltd | Construction | 2026 |
| Expres Claims Ltd | Financial services | 2010 |
| Express 24/7 Ltd | Other services | 2019 |
| Express Auto Buildingrepairs Ltd | Administrative & support | 2016 |
| Express Autos London Ltd | Other services | 2019 |
| Express Car Care Limited | Wholesale & retail | 2011 |
| Express Cleaning Ltd | Administrative & support | 2019 |
| Express Esta EU Ltd | Hospitality | 2019 |
| Express Global Solutions Limited | Transport & logistics | 2010 |
| Express Hairdresser Ltd | Other services | 2022 |
| Express Imaging Limited | Wholesale & retail | 2008 |
| Express Indian Cuisine Delivered Ltd | Hospitality | 2015 |
| Express Indian Cuisine Ltd | Hospitality | 2013 |
| Express Labels Limited | Manufacturing | 2005 |
| Express Line an Ltd | Transport & logistics | 2013 |
| Express Media Ltd | Information & communication | 2024 |
| Express Medico Legal Ltd | Health & social care | 2016 |
| Express Mobile Kitchens Limited | Hospitality | 2021 |
| Express Print Services Limited | Manufacturing | 2022 |
| Express Route (UK) Limited | Transport & logistics | 1996 |
| Express Services 247 Ltd | Administrative & support | 2019 |
| Express Steels & Fabrications Limited | Manufacturing | 1998 |
| Express Trading Solutions Limited | Wholesale & retail | 2015 |
| Express Van Hire Limited | Administrative & support | 2025 |
| Express Vehicle Services (Barry) Limited | Wholesale & retail | 2015 |
| Express Vehicle Services Limited | Wholesale & retail | 2010 |
| Express Visa Consulting Ltd | Education | 2025 |
| Expressmed Diagnostics & Research Ltd | Professional & scientific | 2023 |
| Expressmerch Ltd | Wholesale & retail | 2023 |
| Exquisite Hospitality Ltd | Hospitality | 2025 |
| Exrec Mouldings Limited | Manufacturing | 1982 |
| Exsbrz Mart Ltd | Wholesale & retail | 2025 |
| Extend Construction Ltd | Construction | 2025 |
| External Affairs Consulting Ltd | Professional & scientific | 2024 |
| External-Design-System Limited | Construction | 2014 |
| Extra Eleven Ltd | Wholesale & retail | 2025 |
| Extra Growth Ltd | Professional & scientific | 2026 |
| Extra Hand (London) Limited | Administrative & support | 2010 |
| Extra Time Events Ltd | Administrative & support | 2018 |
| Extrabudget Resident Management Limited | Households | 1986 |
| Extraordinary Partners Limited | Financial services | 2021 |
| Extreme Heating Ltd | Construction | 2017 |
| Extreme Supplies Ltd | Wholesale & retail | 2013 |
| Exuberant Sulay & Co Limited | Wholesale & retail | 2025 |
| Exulentra Ltd | Wholesale & retail | 2025 |
| Exxenbet Limited | Information & communication | 2025 |
| Exxie Edwards Limited | Wholesale & retail | 2025 |
| Exxo Capital & Futures PTY Ltd | Financial services | 2015 |