| 4RWAITH CYF | Administrative & support | 2016 |
| A12 Limited | Administrative & support | 2017 |
| Aase Property Ltd | Construction | 2024 |
| Aase Rentals Ltd | Real estate | 2024 |
| Aber Photonics Limited | Manufacturing | 2020 |
| Acute Detection Ltd | Construction | 2011 |
| Adrian Thomas Limited | Wholesale & retail | 2003 |
| Adve Law Limited | Professional & scientific | 2012 |
| Aeron Sports and Fishing Tackle Limited | Real estate | 2007 |
| Afanc Software Solutions Ltd | Information & communication | 2025 |
| Agpar Ltd | Construction | 2022 |
| AI Inctrl (UK) Ltd | Information & communication | 2024 |
| Aimco Software Ltd | Information & communication | 2020 |
| AJ & FL Davies CYF | Real estate | 2025 |
| Aled Godfrey Ltd | Construction | 2012 |
| Alveway Limited | Construction | 2002 |
| AM QS Services Ltd | Professional & scientific | 2020 |
| Annette Beattie Analytical Consultancy Limited | Professional & scientific | 2013 |
| Archaeodomus Ltd | Professional & scientific | 2025 |
| ASH Percy & Jackson Lettings Ltd | Real estate | 2016 |
| ASH Percy & Jackson Ltd | Real estate | 2012 |
| Ashcombe Apparel Ltd | Wholesale & retail | 2023 |
| Aurelia Talent Group Limited | Arts & recreation | 2025 |
| Aureum Academy of Dance Limited | Education | 2025 |
| Aureum Productions Limited | Arts & recreation | 2025 |
| Avan Group Ltd | Wholesale & retail | 2023 |
| Avicenna Herbal Products Limited | Manufacturing | 2016 |
| Awel YR Awen Ltd | Hospitality | 2021 |
| Awelteifi Ltd | Hospitality | 2017 |
| BAR1875 CYF | Hospitality | 2024 |
| Barcud Coch Ltd | Construction | 2020 |
| Becca Bach Ltd | Agriculture & fishing | 2021 |
| Beceapa Ltd | Information & communication | 2013 |
| Bergen Foods Ltd | Hospitality | 2025 |
| Bevan's Property Management Limited | Real estate | 2025 |
| Beyond Grid Energy Ltd | Information & communication | 2025 |
| Bikewise & Run Ltd. | Wholesale & retail | 2026 |
| BIO Vault Archive Limited | Professional & scientific | 2025 |
| Blackwell Property Portfolio Ltd | Real estate | 2023 |
| Blue Sapphire Films Limited | Information & communication | 2014 |
| Bombay Talkies Limited | Professional & scientific | 2025 |
| Bozeat Building Services Ltd | Construction | 2020 |
| Bplw Limited | Wholesale & retail | 2011 |
| Bricks N Stones Construction Ltd | Construction | 2015 |
| Brierley Audio Ltd | Professional & scientific | 2023 |
| British Harness Racing Club | Arts & recreation | 1987 |
| Brodyr Thomas Ltd | Construction | 2023 |
| Brondeifi Garage Limited | Wholesale & retail | 2007 |
| Brynog Mansion Ltd | Hospitality | 2024 |
| Bullnose Hoop Records Limited | Information & communication | 2014 |
| Business Athlete Limited | Education | 2004 |
| Bwlch Y Person Cottages Ltd | Hospitality | 2003 |
| C&T Site Services Limited | Construction | 2017 |
| C3LD Limited | Agriculture & fishing | 2017 |
| Caben CYF | Real estate | 2025 |
| Cadfador Construction Ltd | Construction | 2020 |
| Caffi'R HEN Ysgol Ltd | Hospitality | 2022 |
| Cameron Frye Ltd | Arts & recreation | 2010 |
| Cardi CYF | Real estate | 2022 |
| Carleasingbargains Co UK Ltd | Wholesale & retail | 2006 |
| Cartref Properties Ltd. | Real estate | 2023 |
| Cbff Ltd | Arts & recreation | 2019 |
| Celaeron Equestrian Ltd | Agriculture & fishing | 2026 |
| Celaeron Glamping Limited | Hospitality | 2017 |
| Cerdd Crescendo Cyfyngedig | Information & communication | 2025 |
| Ceredigion Osteopaths Ltd | Health & social care | 2020 |
| Ceredigion Plumbing Supplies Ltd | Wholesale & retail | 2003 |
| Chetwynd Farms Ltd | Agriculture & fishing | 1999 |
| Chiron Equestrian Clothing Ltd | Wholesale & retail | 2019 |
| Cilcennin Cyntaf | Other services | 2007 |
| Cilgwyn Golf Club Cyfyngedig | Arts & recreation | 1986 |
| Cilgwyn Members' Golf Club | Arts & recreation | 2012 |
| Circular Drinks Limited | Manufacturing | 2024 |
| City Trail Publishing Limited | Information & communication | 2008 |
| CJ Machinery Ltd | Wholesale & retail | 2025 |
| Claws N' Roars Ltd | Manufacturing | 2024 |
| Clwb Rygbi Llambed Cyfyngedig | Arts & recreation | 2005 |
| Cocoon Emporium Ltd | Hospitality | 2016 |
| Cocoon Retreats Ltd | Hospitality | 2013 |
| Coed Camddwr Limited | Agriculture & fishing | 2007 |
| Coedwig Gymunedol Long Wood Community Woodland | Agriculture & fishing | 2004 |
| Cogniosynthesis Portal Ltd | Information & communication | 2025 |
| Conti's Cafe and Wine Bar Limited | Hospitality | 2016 |
| Coombs Tree Services Limited | Agriculture & fishing | 2026 |
| Craig Randell Carpentry & Roofing Ltd | Construction | 2020 |
| Creative Cove Stationery and Gifts Limited | Wholesale & retail | 2025 |
| CTH Homes Ltd | Real estate | 2019 |
| Custom Bull Ltd | Construction | 2025 |
| Cwmni Cydweithredol Troed-Y-Rhiw CYF | Arts & recreation | 2008 |
| Cymru Agricultural and Rural Advice Ltd | Administrative & support | 2005 |
| Cyngor AR Bopeth Ceredigion Citizens Advice Bureau | Other services | 1997 |
| Cysgod-Y-Gaer Management Company Limited | Water & waste | 2007 |
| D B Construction CB Ltd | Construction | 2025 |
| D C Evans Developments Limited | Construction | 2000 |
| D C Evans Plant Hire Limited | Administrative & support | 2000 |
| D J Dudley & SON Ltd | Construction | 2016 |
| D. Jenkins & SON Limited | Transport & logistics | 2000 |
| D.D.Evans & Sons Limited | Wholesale & retail | 1962 |
| D.G.Davies Plumbing and Heating Ltd. | Construction | 2024 |
| DAI Evans Highway Services Ltd | Construction | 2018 |