| Ewart Property Investments Limited | Real estate | 2020 |
| Ewenny Industrial Estate Management Company Limited | Households | 2024 |
| Ewhurst Ltd | Transport & logistics | 2021 |
| Ewing Trading Ltd | Wholesale & retail | 2015 |
| Ewinkel Ltd | Wholesale & retail | 2025 |
| Ewooke Ltd | Wholesale & retail | 2026 |
| EWS Software Ltd | Information & communication | 2018 |
| Ewtank Cedars Ltd | Wholesale & retail | 2024 |
| EX Machina Marketing Ltd | Professional & scientific | 2020 |
| EX Nihil Ltd | Information & communication | 2020 |
| Ex-Auto Parts Ltd | Water & waste | 2025 |
| Exact BMS Limited | Construction | 2017 |
| Exact Enterprises Ltd | Transport & logistics | 2024 |
| Exactbuild Developments Ltd | Construction | 2020 |
| Exactfit Computer Ltd | Wholesale & retail | 2025 |
| Exalt West Wales CIC | Education | 2026 |
| Exaltare Business Consultancy Limited | Financial services | 2020 |
| Exaport Limited | Wholesale & retail | 2011 |
| Excalibur Recruitment Ltd | Administrative & support | 2019 |
| Excav Systems Limited | Administrative & support | 2010 |
| Excb Ltd | Professional & scientific | 2005 |
| Exceed Homecare Ltd | Health & social care | 2023 |
| Excel Driving Ltd | Administrative & support | 2025 |
| Excel Education and Child Psychology Services Ltd | Professional & scientific | 2012 |
| Excel Energy Electricity Ltd | Administrative & support | 2015 |
| Excel Energy GAS Ltd | Administrative & support | 2015 |
| Excel Energy Solutions Limited | Administrative & support | 2011 |
| Excel Estates (UK) Limited | Real estate | 2006 |
| Excel IT Solutions Ltd | Information & communication | 2022 |
| Excel Management Consultants Limited | Information & communication | 2013 |
| Excelerate Security Solutions Limited | Manufacturing | 2006 |
| Excelion Development Group Ltd | Professional & scientific | 2016 |
| Excella Removals Ltd | Transport & logistics | 2019 |
| Excellence Corner Trading Limited | Wholesale & retail | 2025 |
| Excellence in Orthodontics Limited | Health & social care | 2024 |
| Excellence MK Limited | Information & communication | 2023 |
| Excellence Mobile Valeting Ltd | Administrative & support | 2022 |
| Excellence Staffing Systems Ltd | Administrative & support | 2025 |
| Excellence Store Limited | Information & communication | 2025 |
| Excellence Teacher Education Academy Ltd | Education | 2020 |
| Excellent Business Profi Ltd | Wholesale & retail | 2022 |
| Excellent Finish Solutions Ltd | Administrative & support | 2024 |
| Excellent Wages Ltd | Administrative & support | 2025 |
| Excelword Ltd | Information & communication | 2025 |
| Exceptionaire UK Ltd | Manufacturing | 2004 |
| Exchange Buildings Llanelli Management 1 Limited | Real estate | 2006 |
| Exchange Leisure Ltd | Hospitality | 2020 |
| Exchange Limited | Construction | 2022 |
| Exchangehousenewtown Ltd | Hospitality | 2018 |
| Excital Limited | Administrative & support | 2019 |
| Excite Events UK Ltd | Administrative & support | 2019 |
| Excited Much Ltd | Professional & scientific | 2013 |
| Exclusive Bazaar Ltd | Wholesale & retail | 2025 |
| Exclusive Branding Ltd | Wholesale & retail | 2023 |
| Exclusive Brands Limited | Wholesale & retail | 2018 |
| Exclusive Images Limited | Information & communication | 2023 |
| Exclusive Performance Ltd | Wholesale & retail | 2016 |
| Exclusive Tuition Limited | Education | 2020 |
| Exclusive Watches Limited | Wholesale & retail | 2013 |
| Exclusivelyplus Ltd | Manufacturing | 2016 |
| Exclusives Ltd | Wholesale & retail | 2025 |
| Excursion Vision Ltd | Transport & logistics | 2024 |
| Excuss Logistics UK Ltd | Transport & logistics | 2026 |
| Exdi Ltd | Wholesale & retail | 2024 |
| EXE Business Solutions Limited | Professional & scientific | 2025 |
| EXE Estates Ltd | Real estate | 2017 |
| Exec Visuals Ltd | Information & communication | 2025 |
| Execflats.Com Ltd | Administrative & support | 2007 |
| Executive Acumen Limited | Other services | 1998 |
| Executive Corporate Hospitality Ltd | Other services | 2018 |
| Executive Drivers Wales Ltd | Transport & logistics | 2023 |
| Executive Growth Agency Ltd | Professional & scientific | 2025 |
| Executive HR Ltd | Administrative & support | 2025 |
| Executive JET Management Limited | Administrative & support | 2006 |
| Executive JET Solutions Ltd | Transport & logistics | 2003 |
| Executive Learning Solutions Limited | Education | 2025 |
| Executive Lets Cardiff Limited | Real estate | 2018 |
| Executive Lodgings Ltd | Hospitality | 2024 |
| Executive MOT Service Ltd | Wholesale & retail | 2020 |
| Executive Practice Management Ltd | Administrative & support | 2017 |
| Executive Swift Travel Ltd | Transport & logistics | 2018 |
| Executives Ltd | Financial services | 2022 |
| Exeicom Ltd | Information & communication | 2007 |
| Exemplar Benefit Limited | Wholesale & retail | 2020 |
| Exemplaris Consulting Ltd | Professional & scientific | 2004 |
| Exentrique Limited | Wholesale & retail | 2016 |
| Exeqt Ltd | Information & communication | 2026 |
| Exeter Foods Limited | Hospitality | 2016 |
| Exhempt Ltd | Manufacturing | 2018 |
| Exhibita Exhibitions Limited | Construction | 2011 |
| Exicx Ltd | Wholesale & retail | 2024 |
| Exim Technologies Ltd | Information & communication | 2018 |
| Eximia Services Ltd | Households | 2020 |
| Eximum Coaching Ltd | Arts & recreation | 2025 |
| Exins Technologies Ltd | Information & communication | 2020 |
| Exista Holding PC | | 2016 |
| Exista Trade PC | | 2016 |
| Exitus Childrens Care Ltd | Health & social care | 2016 |
| EXL Private Services Ltd | Financial services | 2018 |
| Exley Financial Planning Ltd | Administrative & support | 2020 |