| "Underground Livestock" Ltd | Extraterritorial | 2025 |
| 1 to 4 Plas Ystrad Management Company Limited | Households | 2021 |
| 2 Impress Travel Ltd | Transport & logistics | 2017 |
| 2 R Nejazi Limited | Real estate | 2024 |
| 21CFM Ltd | Financial services | 2024 |
| 21CTS Ltd | Professional & scientific | 2020 |
| 21NECONSORTIUM Ltd | Wholesale & retail | 2020 |
| 3 Cord Services Limited | Construction | 2024 |
| 3 J'S Enterprises Limited | Professional & scientific | 1998 |
| 33 Promotions Limited | Arts & recreation | 2020 |
| 333 Design Ltd | Manufacturing | 2021 |
| 360 Electrical Solutions (Wales) Ltd | Construction | 2026 |
| 3D Universe Limited | Wholesale & retail | 2023 |
| 4 IVY Limited | Administrative & support | 2021 |
| 5 2 9 Limited | Hospitality | 2013 |
| 888 CAD Ltd | Professional & scientific | 2021 |
| 9 Life Agency Limited | Wholesale & retail | 2010 |
| 925 Treats Ltd | Wholesale & retail | 2023 |
| A & a Service Solutions Limited | Manufacturing | 2005 |
| A & D Davies | Agriculture & fishing | 2015 |
| A & M Generators Limited | Wholesale & retail | 2006 |
| A & M Griffiths Limited | Agriculture & fishing | 2008 |
| A & M Plant Hire Limited | Administrative & support | 2003 |
| A & N Developments Ltd | Real estate | 2025 |
| A , D & I Farming Ltd | Agriculture & fishing | 2024 |
| A B Vans Limited | Administrative & support | 2014 |
| A Dean Carpets Limited | Wholesale & retail | 2015 |
| A G Price Construction Limited | Construction | 2015 |
| A G Price Properties Limited | Real estate | 2025 |
| A H Therapies Limited | Health & social care | 2014 |
| A Hartley Ltd | Agriculture & fishing | 2003 |
| A J Boyt Ltd | Professional & scientific | 2018 |
| A J Butler Contracting Limited | Construction | 2021 |
| A J T Recycling Limited | Wholesale & retail | 2010 |
| A Perry Plumbing and Heating Ltd | Construction | 2026 |
| A R & H Davies Limited | Wholesale & retail | 2010 |
| A T Howells Agri Services Ltd | Agriculture & fishing | 2019 |
| A W Plastering & Building Services Ltd | Construction | 2014 |
| A&G Training Limited | Professional & scientific | 2022 |
| A&I Evans Limited | Agriculture & fishing | 2012 |
| A1 Concrete Products (Cymru) Limited | Manufacturing | 2003 |
| A40INFOBAHN Ltd | Professional & scientific | 2006 |
| Aaron Smith Construction Limited | Construction | 2015 |
| Aashish Medical Limited | Health & social care | 2023 |
| AB Asset & Property Ltd | Real estate | 2025 |
| AB Campers & Vehicle Conversions Limited | Wholesale & retail | 2024 |
| Abay Dynamic Property Management Ltd | Households | 2026 |
| Abbey Mead Holdings Ltd | Financial services | 2023 |
| ABC Accountancy and Book Keeping Services Limited | Professional & scientific | 2012 |
| ABD SAM Enterprise Ltd | Wholesale & retail | 2022 |
| Aberglasney Enterprises Limited | Wholesale & retail | 2002 |
| Aberglasney Restoration Trust | Other services | 1994 |
| Abraxas Property Limited | Real estate | 2008 |
| Ac-Hb* Services Limited | Information & communication | 2019 |
| Accessible Escapes CBC | Hospitality | 2025 |
| AD Financial Consultancy Ltd | Professional & scientific | 2024 |
| Adam Lewis Carpentry Limited | Construction | 2025 |
| Adh-Me Ltd | Health & social care | 2023 |
| Adorabode Ltd | Real estate | 2026 |
| Advance Sharepoint Ltd | Information & communication | 2013 |
| Aecf Properties Ltd | Real estate | 2021 |
| Aegis Housing Limited | Construction | 2021 |
| Aeron Mobile Homes CYF. | Real estate | 2023 |
| Aesthetics by Eleanor Ltd | Health & social care | 2023 |
| Affinity Financial Management Limited | Financial services | 2020 |
| Affinity Legal Solutions Ltd | Professional & scientific | 2023 |
| AGA Barbers Ltd | Other services | 2025 |
| Agmpower Ltd | Wholesale & retail | 2025 |
| Agri Angels Ltd | Administrative & support | 2008 |
| Agricultural Property Holdings Ltd | Financial services | 2025 |
| AH Carms Ltd | Hospitality | 2022 |
| AI Cleaning Solutions Limited | Administrative & support | 2023 |
| AIM High Busnes Ltd | Administrative & support | 2023 |
| Air B and B @ the View Limited | Hospitality | 2023 |
| Air Quality Testing Limited | Construction | 2017 |
| Air Quality Testing Solutions Limited | Construction | 2022 |
| Airbridge Projects L.P. | | 2018 |
| AJD Carmichael Ltd. | Construction | 2022 |
| AJF Couriers Limited | Transport & logistics | 2025 |
| AKM Telco Solutions Ltd | Information & communication | 2021 |
| Al's Fitness Limited | Arts & recreation | 2018 |
| Alan Davies Electrical Ltd | Other services | 2018 |
| Alche-Me Business Solutions Ltd | Professional & scientific | 2026 |
| Aled Evans Plumbing & Heating Ltd. | Construction | 2025 |
| Aled Morgan Construction Ltd | Manufacturing | 2026 |
| Alex Lewis Motors Ltd | Wholesale & retail | 2024 |
| Alexander Barber I Ltd | Other services | 2023 |
| Alfies Pawsome Parlour Limited | Other services | 2021 |
| Alga (Seaweed) Limited | Agriculture & fishing | 2021 |
| ALL Bits Combined Limited | Construction | 2026 |
| ALL Ears Ltd | Health & social care | 2019 |
| ALL Support Limited | Health & social care | 2022 |
| ALL Trades Supplies Ltd | Wholesale & retail | 2023 |
| Allistairs Holdings Limited | Hospitality | 2017 |
| Allpipes Civils Ltd | Construction | 2022 |
| Allpump Services Limited | Water & waste | 2000 |
| Allsparks Electrical Contractors Limited | Construction | 2012 |
| ALM4G Plant Ltd | Administrative & support | 2024 |
| Alpine Scaffolding Services Limited | Construction | 2025 |
| Altime Care Ltd | Health & social care | 2024 |