| "Lady Fair" (Llandudno) Limited | Real estate | 1964 |
| 10 Kings Road Management Company Limited | Professional & scientific | 2000 |
| 1250 Limited | Wholesale & retail | 2015 |
| 138 Abergele Road RTM Company Limited | Households | 2009 |
| 14 Sparkles Ltd | Administrative & support | 2023 |
| 18 Upper Promenade Management Company Limited | Other services | 2017 |
| 2 Claughton Road Management Company Limited | Households | 2016 |
| 2 Rivieres Avenue RTM Company Ltd | Extraterritorial | 2014 |
| 20 Wynnstay Road Limited | Real estate | 2017 |
| 22 Cadwgan Road Management Company Limited | Households | 2017 |
| 25 Woodland Road West Management Limited | Hospitality | 2012 |
| 2512 Developments Limited | Construction | 2020 |
| 28 Applause Ltd | Arts & recreation | 2023 |
| 2SK Care Homes Ltd | Health & social care | 2017 |
| 35 Marine Drive Management Company Limited | Real estate | 2015 |
| 3D on Demand Ltd | Manufacturing | 2021 |
| 3X Software Limited | Information & communication | 1984 |
| 43 Lawson Road Limited | Real estate | 2004 |
| 5 A&B Management Team Ltd | Households | 2023 |
| 57 Greenfield Road RTW Company Ltd | Households | 2025 |
| 75POINT3 Financial Planning LLP | | 2012 |
| 75POINT3 Limited | Financial services | 2002 |
| 7X19 Consultancy Limited | Professional & scientific | 2018 |
| 9 Mostyn Road (Colwyn Bay) Management Company Limited | Households | 2016 |
| 9/11 Arvon Avenue Management Company Limited | Administrative & support | 2004 |
| A Carroll Ltd | Information & communication | 2022 |
| A Pike Industries Ltd | Transport & logistics | 2025 |
| A Place for Everything Limited | Extraterritorial | 2008 |
| A&L Access Ltd. | Construction | 2016 |
| A1A Trading Ltd | Wholesale & retail | 2021 |
| A55 Car Keys Ltd | Wholesale & retail | 2024 |
| AB Lifting Operations Ltd | Construction | 2017 |
| ABC Auto Electrical Spares CYF | Wholesale & retail | 2018 |
| ABC Computing Limited | Information & communication | 1997 |
| Aberconwy Cooling Limited | Construction | 2024 |
| Aberconwy Marine & Mechanics Limited | Wholesale & retail | 2011 |
| Aberconwy Scaffolding Ltd | Construction | 2018 |
| Abrasive Technology Limited | Manufacturing | 1993 |
| Absolute Precision Auto Detailing Ltd | Wholesale & retail | 2020 |
| Absolute Sound and Lighting Solutions Limited | Wholesale & retail | 2008 |
| Ace Close Protection Agency and Security Services Ltd | Administrative & support | 2006 |
| Adare Electrical Limited | Construction | 2024 |
| Adferiad Recovery Limited | Health & social care | 1992 |
| ADK Consultancy (NW) Ltd | Financial services | 2026 |
| Adrian P Jones Ltd | Information & communication | 2023 |
| Adshead Properties Ltd | Administrative & support | 2023 |
| Advance Autoparts Ltd | Wholesale & retail | 2002 |
| Adventure Heaven Ltd | Education | 2022 |
| Adventuretoursnowdonia Ltd | Administrative & support | 2018 |
| AEL Capital Ltd | Administrative & support | 2013 |
| AFM Wealth Management Ltd | Professional & scientific | 2020 |
| Agata Ryszewska Ltd | Professional & scientific | 2025 |
| Agata Traders Ltd | Wholesale & retail | 2026 |
| Ahmed & Nasir Healthcare Limited | Health & social care | 2022 |
| Aingarth Rest Home Limited | Health & social care | 2013 |
| Airmodels Ltd | Wholesale & retail | 2018 |
| Ajet Ventures Ltd | Financial services | 2020 |
| AJW Renewables Ltd | Professional & scientific | 2025 |
| AK Dental Limited | Health & social care | 2024 |
| Akin Coffee Limited | Hospitality | 2025 |
| AL Shamas (N.W) Ltd | Wholesale & retail | 2013 |
| Alaly Noor Traders Ltd | Wholesale & retail | 2025 |
| ALG Security Ltd | Administrative & support | 2017 |
| ALG Training Academy Ltd | Education | 2023 |
| Aligned Building Consultancy Ltd | Extraterritorial | 2025 |
| Aligned by Design Ltd | Health & social care | 2025 |
| Aljezza Limited | Information & communication | 2013 |
| ALL About the Admin Ltd | Information & communication | 2024 |
| ALL in One Interiors Ltd | Wholesale & retail | 2020 |
| All-Star Stickers Limited | Wholesale & retail | 2024 |
| Allenby and Scott Ltd | Wholesale & retail | 2024 |
| Alohapack UK Ltd | Wholesale & retail | 2020 |
| Alpha Business Centre Limited | Wholesale & retail | 1982 |
| Alpha Hector Ltd | Professional & scientific | 2018 |
| Alphyn Ltd | Administrative & support | 2008 |
| Alpine Cars Limited | Wholesale & retail | 2008 |
| Altar BOY Music UK Limited | Information & communication | 2017 |
| Alternative Cleaning Solutions (NW) Ltd | Administrative & support | 2016 |
| Altrin Limited | Extraterritorial | 2012 |
| Alwyn R Electrical Ltd | Construction | 2022 |
| Ambermere Limited | Professional & scientific | 2017 |
| AMG Oncology Limited | Health & social care | 2018 |
| AMK Indian Takeaway Ltd | Hospitality | 2020 |
| Andersson Media Ltd | Information & communication | 2021 |
| Angel Property Investments Group Limited | Real estate | 2026 |
| Angle Commercial Services Limited | Professional & scientific | 2021 |
| Angle Surveys Limited | Professional & scientific | 2013 |
| Anglesey Commercial Services Limited | Real estate | 2023 |
| Anitas Living Limited | Real estate | 2021 |
| Antioch (North Wales) | Other services | 2003 |
| APE Libation & Co Ltd | Hospitality | 2026 |
| Apex Prime Locations Ltd | Real estate | 2021 |
| Apph (NW) Ltd | Construction | 2023 |
| Approval Removal Limited | Water & waste | 2021 |
| Approved Resin Franchise Ltd | Construction | 2020 |
| APT Security NW Limited | Administrative & support | 2009 |
| Aqua Safe Fire Sprinkler System Ltd | Other services | 2021 |
| Aram Consulting Limited | Professional & scientific | 2025 |
| Arty Expressions Ltd | Administrative & support | 2026 |
| Ashe Renewables Ltd | Construction | 2023 |