| 'THE 1ST Caergwrle Company of the Boys Brigade Limited | Other services | 2012 |
| 15TWELVE Limited | Professional & scientific | 2024 |
| 1810 Property Limited | Real estate | 2016 |
| 24-7 Monitoring Limited | Extraterritorial | 2006 |
| 313 National Halal Ltd | Manufacturing | 2019 |
| 369 Technical Ltd | Manufacturing | 2021 |
| 3980 Ltd | Other services | 2024 |
| 3R2 Ltd | Professional & scientific | 2025 |
| 4TH Floor Design Ltd | Professional & scientific | 2022 |
| 52 Finance Limited | Financial services | 2010 |
| 7T3SALES Ltd | Wholesale & retail | 2023 |
| A D Williams & Sons Ltd | Transport & logistics | 2015 |
| A J Electrical (Mold) Limited | Construction | 2003 |
| A L Jones & SON Limited | Wholesale & retail | 2011 |
| A Mckinney Ltd | Financial services | 2024 |
| A Perfect World Ltd | Wholesale & retail | 2016 |
| A White Events Limited | Arts & recreation | 2012 |
| A-Z Rack Inspections Ltd | Professional & scientific | 2020 |
| A-Z Storage Systems Ltd | Wholesale & retail | 2005 |
| A. E. Rowlands Plant Hire Limited | Construction | 2006 |
| A. Parry Construction Co Limited | Construction | 1991 |
| A.G.Y. Tasty Food Ltd | Hospitality | 2022 |
| A.Roberts Ltd | Professional & scientific | 2016 |
| A.S Plumbing & Heating (NW) Ltd | Construction | 2018 |
| A1 Clearances (North West) Ltd | Water & waste | 2015 |
| Aarco 254 Limited | Real estate | 2005 |
| AAS Rhydymwyn Ltd | Wholesale & retail | 2013 |
| Abbey Garage Doors (NW) Ltd | Construction | 2011 |
| Abode Properties Ltd | Real estate | 2016 |
| Above & Beyond Heating Solutions Ltd | Construction | 2021 |
| Acclaim Legal Services Limited | Professional & scientific | 2013 |
| Accounting & Bookkeeping Consultancy Ltd | Professional & scientific | 2017 |
| Ace of Sports Ltd | Arts & recreation | 2016 |
| ACORN4MORTGAGES Limited | Financial services | 2001 |
| ACORN4MORTGAGES2 Limited | Financial services | 2020 |
| Acro Squad Ltd | Education | 2021 |
| Activewise Limited | Other services | 1986 |
| Actual Landscapes Ltd | Construction | 2017 |
| Ad-Technologies.Ai Ltd | Information & communication | 2023 |
| Adscaf Access Solutions Ltd | Construction | 2024 |
| Adsum Resource Ltd | Professional & scientific | 2019 |
| Advocacy Services North East Wales Ltd | Health & social care | 2003 |
| Aftermath Courier Services Ltd | Transport & logistics | 2025 |
| AG Digital Consulting Ltd | Information & communication | 2018 |
| AGM Corporation Ltd | Administrative & support | 2021 |
| Agronomic Digital Innovation Ltd | Information & communication | 2023 |
| AGS Holdings Limited | Professional & scientific | 2006 |
| AGS Security Systems Limited | Administrative & support | 2003 |
| AH Plant Hire Limited | Administrative & support | 2003 |
| AI Insights Consulting Limited | Professional & scientific | 2022 |
| Aimstar Support Ltd | Professional & scientific | 2024 |
| Airstorks Ltd | Information & communication | 2013 |
| AJE Landscaping & Groundworks Ltd | Administrative & support | 2016 |
| AJS Property & Developments Ltd | Real estate | 2025 |
| AJT Engineering Services Ltd | Professional & scientific | 2015 |
| Albrite Cleaning Services Limited | Administrative & support | 2012 |
| Alcom Consultancy Cyfyngedig | Information & communication | 2015 |
| Alexander Christian Ltd | Manufacturing | 2010 |
| Aliter Black Limited | Construction | 2022 |
| Aliter Limited | Construction | 2000 |
| Aliter White Limited | Professional & scientific | 2022 |
| ALL About the Home Limited | Wholesale & retail | 2007 |
| ALL Access Roofing Limited | Construction | 2016 |
| ALL for Stone Limited | Manufacturing | 2012 |
| ALL My Waste Ltd | Water & waste | 2022 |
| ALL YOU Hair and Beauty Ltd | Other services | 2022 |
| Allforio Solutions Limited | Administrative & support | 2025 |
| Alltami House Management Ltd | Construction | 2011 |
| Alyn Estates Ltd | Real estate | 2025 |
| Alyn Smile Centre Ltd | Health & social care | 2026 |
| Amelia George Laser Ltd | Other services | 2026 |
| Amelia George Skin Ltd | Education | 2021 |
| AMG Advisory Group Limited | Professional & scientific | 2022 |
| Amoz Group Limited | Construction | 2025 |
| Ampersand Editorial Limited | Information & communication | 2012 |
| Andersons Blinds Limited | Wholesale & retail | 2002 |
| Andrew Holmes Contracting Limited | Agriculture & fishing | 2025 |
| Andrew Williams Limited | Extraterritorial | 2025 |
| Ankerdbrew Ltd | Manufacturing | 2022 |
| ANN Savva Group Ltd | Administrative & support | 2017 |
| Ann's Couriers Ltd | Transport & logistics | 2024 |
| Anna Jones Hair & Beauty Training Academy Ltd | Other services | 2022 |
| Anvilmar Limited | Real estate | 2021 |
| AOD Interiors Ltd | Construction | 2018 |
| AOT Delivery Ltd | Transport & logistics | 2024 |
| Aoto Ltd | Professional & scientific | 2021 |
| Applied Jidoka Limited | Professional & scientific | 2019 |
| Aptech Solids Ltd | Water & waste | 2012 |
| Aquafinity Swimming Liverpool Ltd | Education | 2025 |
| Aquafinity Swimming Ltd | Education | 2022 |
| Aquarius Executive Coaching Limited | Education | 2002 |
| AR Waith Consulting Cyfyngedig | Information & communication | 2025 |
| Arbour Developments Limited | Construction | 2022 |
| Archdale EMW Ltd | Other services | 2015 |
| Archers Green 1967 Limited | Extraterritorial | 2015 |
| Architech North Wales Ltd | Professional & scientific | 2025 |
| Archway Reflexology Limited | Health & social care | 2012 |
| Argoed Hall Farm Limited | Agriculture & fishing | 2013 |
| Arlly Ltd | Households | 2025 |
| Armour Wills & Estate Planning Ltd | Professional & scientific | 2022 |