| (Jwxmt) Ltd | Other services | 2022 |
| 12 Electronics Ltd | Other services | 2023 |
| A & a Electrical Contractor Services Ltd | Construction | 2019 |
| A Battrick Podiatrist Limited | Health & social care | 2006 |
| A&Jp Developments Ltd | Real estate | 2025 |
| Access Lean Limited | Professional & scientific | 2010 |
| Access Renewable Energy Ltd | Professional & scientific | 2014 |
| Adapt Three Nine Ltd | Professional & scientific | 2016 |
| Adiyaman Limited | Hospitality | 2026 |
| Advance Property Management Ltd | Administrative & support | 2011 |
| Affinity International Development Ltd | Education | 2025 |
| Agrirentals Ltd | Real estate | 2012 |
| Aledaphna Limited | Hospitality | 2005 |
| ALL Seasons Gardening and Landscape Services Ltd | Administrative & support | 2021 |
| Allison's of Llanmaes Ltd | Real estate | 2021 |
| Allwedd Analytics Limited | Information & communication | 2025 |
| Amergin Ltd | Professional & scientific | 2017 |
| Ancora Equestrian Ltd | Wholesale & retail | 2018 |
| Anderson Contract Services Ltd. | Construction | 2021 |
| Andrew Allen GAS & Plumbing Limited | Construction | 2012 |
| Andrew Dawson Brown Group Ltd | Transport & logistics | 2026 |
| Anthony Brown Estate Agents Limited | Real estate | 2002 |
| Antur Llain Limited | Arts & recreation | 2018 |
| Aquaguard Services Limited | Wholesale & retail | 1990 |
| Arborscapes Ltd | Manufacturing | 2019 |
| Arborwood Tree Care Limited | Agriculture & fishing | 2014 |
| Arries Plumbing Ltd | Construction | 2025 |
| Atlantic College Enterprises Limited | Education | 2011 |
| Atlantic Pacific International Rescue Limited | Other services | 2016 |
| Austin Accountancy Services Ltd | Professional & scientific | 2016 |
| Avant Hire (South Wales) Ltd | Administrative & support | 2010 |
| Awen Collaborative Limited | Information & communication | 2015 |
| Barefoot Trading Limited | Wholesale & retail | 2006 |
| Bart Motors Llantwit LLP | | 2018 |
| Bart Motors Ltd | Wholesale & retail | 2015 |
| Bay Cars Limited | Extraterritorial | 2006 |
| Beauty by Shan Limited | Other services | 2023 |
| Big SAM Ltd | Hospitality | 2018 |
| Bikelawyer Limited | Professional & scientific | 2010 |
| Biscof Transport Limited | Water & waste | 2025 |
| Blanc Hair and Beauty Limited | Other services | 2022 |
| Bonny Tiler Ltd | Construction | 2014 |
| Boomriderstudios Ltd. | Information & communication | 2011 |
| Boswell Analytical Limited | Professional & scientific | 2026 |
| Breezy Media Ltd | Professional & scientific | 2021 |
| Brighter Moves Limited | Real estate | 2011 |
| Brycon (UK) Limited | Wholesale & retail | 1994 |
| Buckhurst Marketing Ltd | Professional & scientific | 2022 |
| Buckhurst Property Group Ltd | Financial services | 2022 |
| Buckhurst Property Investment Ltd | Real estate | 2021 |
| Buckhurst Property Trading Ltd | Real estate | 2021 |
| BXU Consulting Ltd | Professional & scientific | 2023 |
| BXU Ltd | Real estate | 2020 |
| C2 Business Centre Ltd | Real estate | 2012 |
| Caramella Homes Ltd | Real estate | 2019 |
| Carbon Coyote Ltd | Professional & scientific | 2022 |
| Cardiff Airport Taxis Limited | Extraterritorial | 2005 |
| Cardiff Driving School Ltd | Education | 2025 |
| Carian Consultancy Services Ltd | Professional & scientific | 2024 |
| Celtic Composite Consultancy Ltd | Professional & scientific | 2016 |
| Celtic Estates Limited | Real estate | 1956 |
| CG Technical Services Ltd | Administrative & support | 2016 |
| Christopher Designs (Furniture) Ltd | Manufacturing | 2003 |
| Clack and Thompson General Builders Ltd | Construction | 2024 |
| Climbing Collective Ltd | Arts & recreation | 2020 |
| Cnlcm Properties Ltd | Real estate | 2017 |
| Coasts Cafe & Bakers Limited | Hospitality | 2007 |
| Coded Limited | Professional & scientific | 2004 |
| Coffi Kava Ltd | Hospitality | 2024 |
| Colhuw Cafe Ltd | Hospitality | 2019 |
| Collyer & Coates (Holdings) Ltd | Real estate | 2023 |
| Colston Lettings Limited | Real estate | 2005 |
| Complete Office Moves Limited | Administrative & support | 2007 |
| Coniston Consulting Services Limited | Professional & scientific | 2023 |
| Continuum Motion Technologies Ltd | Manufacturing | 2026 |
| Cosy FOX Ltd | Wholesale & retail | 2017 |
| Countryside Management Services (CMS) Limited | Manufacturing | 2016 |
| CS Property & Landscapes Ltd | Administrative & support | 2021 |
| Ctlg Property Holdings Limited | Real estate | 2022 |
| Cute Club Limited | Wholesale & retail | 2020 |
| Cyclinglawyer Limited | Professional & scientific | 2020 |
| D Liscombe Aggregates Limited | Construction | 2018 |
| D MAC Sales Ltd | Wholesale & retail | 2023 |
| D R & E G Davies Limited | Agriculture & fishing | 2008 |
| D:Vision Design Limited | Professional & scientific | 2010 |
| Daffodil Mediation Services Limited | Administrative & support | 2025 |
| Dalmanutha Ministries Cymru | Other services | 2025 |
| Darwin Restaurants Limited | Hospitality | 2023 |
| Datod Consulting Ltd | Professional & scientific | 2019 |
| Davies Carpentry Developments Limited | Construction | 2019 |
| DAW Property Maintenance Ltd | Construction | 2017 |
| Day Trip Media Limited | Information & communication | 2013 |
| Dean Page Carpentry Ltd | Construction | 2012 |
| Defigo Finance Limited | Professional & scientific | 2009 |
| Dentethics Limited | Wholesale & retail | 2022 |
| DFD Finance Services Limited | Professional & scientific | 2014 |
| Dimlands Farm Riding School Limited | Arts & recreation | 2003 |
| DLM Aero Ltd | Manufacturing | 2022 |
| Dragon Tackle International Limited | Wholesale & retail | 2002 |
| Dragon Tears Limited | Health & social care | 2005 |