| AK Bargain Store Limited | Wholesale & retail | 2025 |
| AK REA Consultancy Limited | Information & communication | 2022 |
| AK Wrexham Auto Repairs Limited | Wholesale & retail | 2026 |
| Akanbi Estates Limited | Health & social care | 2024 |
| AL & JE Properties Limited | Real estate | 2024 |
| Alan Rhone Holdings Limited | Financial services | 2016 |
| Alan Rhone Limited | Administrative & support | 2000 |
| Alan W Morris Decorators Limited | Other services | 2015 |
| Alastair Meldrum Limited | Professional & scientific | 2018 |
| Albert Mdawarima Ltd | Construction | 2007 |
| Alberto.Dotolo Ltd | Construction | 2015 |
| Albry Limited | Real estate | 2016 |
| Alex Jones Renovations Limited | Construction | 2019 |
| Alex Rides Ltd | Transport & logistics | 2026 |
| Alexander Real Estate Limited | Real estate | 2016 |
| Alexander's Pharmacies Limited | Wholesale & retail | 2002 |
| Alexsai Properties Limited | Real estate | 2021 |
| ALF Jones Cycles Limited | Wholesale & retail | 1998 |
| Alfagen Limited | Extraterritorial | 2023 |
| Ali's Creationz Ltd | Wholesale & retail | 2021 |
| Alien Innovations Ltd | Professional & scientific | 2020 |
| Alien Scaffold Ltd | Construction | 2023 |
| Alignment Engineering Consultants Limited | Professional & scientific | 2024 |
| Alitura Limited | Wholesale & retail | 2016 |
| ALL About Softplay Ltd | Construction | 2018 |
| ALL Aspects Catering Ltd | Hospitality | 2023 |
| ALL Electric Racing Ltd | Wholesale & retail | 2022 |
| ALL Gym Safety Services Limited | Extraterritorial | 2021 |
| ALL Things Trees Limited | Administrative & support | 2006 |
| Allen Accountancy Limited | Professional & scientific | 2021 |
| Allington Hughes Limited | Professional & scientific | 2011 |
| Allitalia Ltd | Wholesale & retail | 1997 |
| Allpawswalking Ltd | Other services | 2025 |
| Allwood Estate Agencies Limited | Real estate | 1973 |
| Alma DE SOL Ltd | Wholesale & retail | 2024 |
| Almeidacontractor Ltd | Other services | 2025 |
| Almetron Limited | Manufacturing | 1983 |
| Almt Limited | Information & communication | 2025 |
| ALO Eatery Ltd | Hospitality | 2025 |
| ALP Social Care Consultancy Ltd | Health & social care | 2023 |
| Alpha (Wrexham) Windows Ltd | Construction | 2002 |
| Alpha 55 Events Limited | Arts & recreation | 2014 |
| Alpha Advisers Ltd | Professional & scientific | 2017 |
| Alpha Permanent Makeup Academy Limited | Education | 2019 |
| Alphagen Energy Limited | Extraterritorial | 2025 |
| Alpine Engineering Limited | Professional & scientific | 2003 |
| Alpine GAS Engineers Limited | Construction | 2015 |
| ALT Food Safety Limited | Administrative & support | 2014 |
| ALT Steelfixing Ltd. | Construction | 2015 |
| Altaaj Limited | Health & social care | 2025 |
| Altaeros UK Limited | Manufacturing | 2024 |
| Altan Chicken Ltd | Hospitality | 2019 |
| Altcar Solutions Ltd | Administrative & support | 2016 |
| Althrey Hall Farm Barns Management Ltd | Real estate | 2026 |
| Althrey Holdings Limited | Agriculture & fishing | 2018 |
| ALUM8 Specialist Welding Limited | Manufacturing | 2010 |
| Alunox Advanced Tube Engineering Limited | Manufacturing | 2018 |
| Always Rosy Limited | Manufacturing | 2022 |
| Alyn Lodge Limited | Hospitality | 2002 |
| Alyn Projects Services Limited | Professional & scientific | 2022 |
| Alyn Property Limited | Real estate | 2026 |
| Alyn Property Management Limited | Real estate | 2004 |
| AM Medicaid Ltd | Manufacturing | 2020 |
| AM Pryde Properties Limited | Real estate | 2022 |
| AM Utility Services Ltd | Manufacturing | 2014 |
| AM89 Ltd | Education | 2025 |
| Amanda Murphy Limited | Health & social care | 2015 |
| Amasing Arts | Arts & recreation | 2019 |
| Amazing Smiles Ltd | Health & social care | 2022 |
| Ambel Homes Limited | Construction | 2020 |
| American Candy Empire Limited | Real estate | 2019 |
| AMJ Contractors Ltd | Real estate | 2025 |
| Amjoco Limited | Information & communication | 2011 |
| AMP Engineering Solutions Ltd | Construction | 2012 |
| Amptech Electrical Systems Ltd | Construction | 2025 |
| AMR Vehicle Rentals Ltd | Administrative & support | 2024 |
| Amtp Music Ltd | Arts & recreation | 2025 |
| Amts Media Limited | Information & communication | 2023 |
| Amzng Products Ltd | Wholesale & retail | 2024 |
| Ana's Homes Limited | Construction | 2020 |
| Ancka Consulting Limited | Professional & scientific | 2020 |
| Anderton & Davies Ltd | Wholesale & retail | 2021 |
| Andre's Auto Service Ltd | Wholesale & retail | 2022 |
| Andrea Kirkham Hairdressing Limited | Other services | 2013 |
| Andrew Dexter Plumbing & Heating Limited | Construction | 2014 |
| Andrew Laurence Hair Studio Limited | Other services | 2003 |
| Andrew Sanctuary Ltd | Information & communication | 2022 |
| Andrew Wright (Wrexham) Ltd | Other services | 2012 |
| Andy Pritchard Plant Hire & Groundworkers Limited | Construction | 2014 |
| ANG IT Consulting Limited | Information & communication | 2006 |
| Angela Kyte London Ltd | Health & social care | 2007 |
| Angelic Gelato Limited | Hospitality | 2024 |
| Angels Invest Wales Limited | Financial services | 2002 |
| Angelteccies Limited | Professional & scientific | 2015 |
| Anisa (Chirk) Limited | Hospitality | 2018 |
| Anna Buckley Consulting Ltd | Administrative & support | 2025 |
| Anna Dempsey Ltd | Health & social care | 2023 |
| Anna Williams Medical Ltd | Health & social care | 2025 |
| Anne's Hairdressers Limited | Other services | 2003 |
| Annyalla Chicks (UK) Broiler Breeders Limited | Agriculture & fishing | 2015 |