| 155 Percy Road Ltd | Households | 2000 |
| 3P Technik UK Limited | Wholesale & retail | 2005 |
| 65-66 Elliott's ROW Freehold Limited | Real estate | 2019 |
| 68 and 68A Dornton Road (Freehold) Limited | Real estate | 2025 |
| 86 Larkhall Rise Limited | Administrative & support | 2005 |
| 95 Coningham Road (Residents Association) 2001 Limited | Households | 2001 |
| 956 Consulting Limited | Professional & scientific | 2024 |
| A B Kerr Ltd | Manufacturing | 2004 |
| A Williams Project Management Limited | Professional & scientific | 2016 |
| A.F.Smith & Sons,Limited | Wholesale & retail | 1926 |
| Aberporth Coastal Holiday Bungalows Ltd | Real estate | 2023 |
| Aberporth Curry House Ltd | Hospitality | 2024 |
| Aberporth Holiday Cottages Limited | Hospitality | 2020 |
| Aberporth Wales Holiday Cottages Ltd | Real estate | 2023 |
| Accessary Services Ltd | Professional & scientific | 2014 |
| Adref Construction Ltd | Construction | 2020 |
| Adref Heating & Renewables Limited | Professional & scientific | 2020 |
| Advanced Milking Systems Limited | Manufacturing | 2019 |
| Adventure Powerboats Ltd | Transport & logistics | 2006 |
| AEH Baker Ltd | Hospitality | 2010 |
| Afon Teifi Fairways Limited | Real estate | 2006 |
| Airless Plastering (Wales) Limited | Construction | 2016 |
| AJM Bespoke Construction Limited | Construction | 2019 |
| AJM Properties and Development Limited | Real estate | 2022 |
| ALD. Agri. Limited | Agriculture & fishing | 2004 |
| Algae Saves the World, Consulting Ltd | Professional & scientific | 2017 |
| Ali's Tandoori (Cardigan) Limited | Hospitality | 2009 |
| Aliwdaf Limited | Real estate | 2025 |
| ALL Business Solutions Limited | Professional & scientific | 2020 |
| Allotropical Limited | Information & communication | 1998 |
| Ami-Fidele Ltd | Agriculture & fishing | 2011 |
| Amy's Life Ltd | Information & communication | 2025 |
| Anaharta Properties Ltd | Real estate | 2024 |
| Andy Bever Limited | Information & communication | 2014 |
| Aneurin Mathias Carpentry Roofing and Building Ltd | Construction | 2024 |
| APW Floors and Walls Limited | Construction | 2022 |
| AR Nikolov Ltd | Wholesale & retail | 2025 |
| Archi-Tech Limited | Professional & scientific | 2003 |
| Ardent Account Services Limited | Professional & scientific | 2005 |
| Arnold's PC Services Ltd | Wholesale & retail | 2023 |
| Arnold-Steele Ltd | Construction | 2024 |
| ASD and Sons Construction Ltd | Construction | 2025 |
| Athena AI Ltd | Information & communication | 2026 |
| Athena Worlds Limited | Information & communication | 2024 |
| Aurora Renewables Limited | Professional & scientific | 2003 |
| Autohaus Car Storage Limited | Transport & logistics | 2020 |
| AWC Property Maintenance Ltd | Construction | 2024 |
| AYC North END Limited | Wholesale & retail | 2009 |
| B & S Enterprises Limited | Wholesale & retail | 2002 |
| B.V. Rees Limited | Wholesale & retail | 1990 |
| BCF Medical Limited | Health & social care | 2018 |
| Beachbay Limited | Construction | 1997 |
| Beacon Productivity Limited | Professional & scientific | 2023 |
| BEE Embroidery & Printing Limited | Wholesale & retail | 2023 |
| BEN Truslove Plumbing & Heating Ltd | Construction | 2019 |
| Bigft Construction Limited | Construction | 2001 |
| Bigger Box Limited | Real estate | 2006 |
| Blaendolau Building Services Limited | Construction | 2001 |
| Blaenpant Farm Limited | Agriculture & fishing | 2013 |
| Blankestijn Advocaten LLP | | 2009 |
| Blue Sky Digital Marketing Limited | Professional & scientific | 2014 |
| Blue Stag Property Ltd | Financial services | 2019 |
| Bluegreencymru CIC | Health & social care | 2021 |
| Booking Master Ltd | Information & communication | 2000 |
| BOY Ashore Limited | Hospitality | 2019 |
| Briscwm Farm Limited | Agriculture & fishing | 2008 |
| BRO Preseli Limited | Construction | 2005 |
| Broadleaf (Aberystwyth) Limited | Manufacturing | 2004 |
| Brondesbury Lodge Limited | Health & social care | 2003 |
| Bryn Berwyn Country Holdings Ltd | Hospitality | 2021 |
| Brynonnen Residents Management Limited | Households | 1989 |
| Buildright Building Services Limited | Administrative & support | 2011 |
| Buildwales Limited | Construction | 2017 |
| Bumblebee Tree & Garden Services Ltd | Administrative & support | 2023 |
| Business With Intelligence Ltd | Professional & scientific | 2025 |
| Busy BEE Natural Ltd | Administrative & support | 2017 |
| Bywood Celtic Limited | Extraterritorial | 2005 |
| C M Farms Limited | Agriculture & fishing | 2013 |
| C S J Passant Ltd | Financial services | 2025 |
| Caban Mwnt Limited | Wholesale & retail | 2022 |
| Calon LAN Ltd | Administrative & support | 2018 |
| Canllefaes Ventures Ltd | Hospitality | 2019 |
| Capilano Holdings Ltd | Financial services | 2026 |
| Cardi Building Supplies Limited | Wholesale & retail | 2003 |
| Cardigan and District Agricultural & Maritime Museum | Arts & recreation | 2009 |
| Cardigan Bay Architectural Conservation Limited | Construction | 2023 |
| Cardigan Bay Fish and Chips CEI Ltd | Hospitality | 2022 |
| Cardigan Bay Fish and Chips Ltd | Hospitality | 2021 |
| Cardigan Bay Leisure Vehicle Storage Ltd | Transport & logistics | 2018 |
| Cardigan Brewery Ltd | Administrative & support | 2019 |
| Cardigan Building Preservation Trust | Real estate | 2001 |
| Cardigan Castle Enterprises Limited | Arts & recreation | 2010 |
| Cardigan Climbing CIC | Arts & recreation | 2026 |
| Cardigan Islamic Cultural Centre Ltd | Health & social care | 2011 |
| Cardigan Island Ltd | Arts & recreation | 2015 |
| Cardigan Kitchen & Tile Co Limited | Construction | 2003 |
| Cardigan Marine Services Ltd | Manufacturing | 2025 |
| Cardigan Mercantile Company Limited | Administrative & support | 1875 |
| Cardigan Powdercoating Limited | Manufacturing | 2023 |
| Cardigan Quays Limited | Hospitality | 1999 |