| 109TH Avenue Ltd | Information & communication | 2026 |
| 220 Specialist Commodity Services Ltd | Professional & scientific | 2025 |
| 3NA Properties Ltd | Real estate | 2024 |
| 90NINE Ltd | Wholesale & retail | 2026 |
| 96 Cathedral Road Management Company Limited | Households | 2011 |
| A J LIA Painting & Decorating Ltd | Construction | 2022 |
| A-Z Mobile & Repair Hub Ltd | Wholesale & retail | 2025 |
| A1 Tree Care Services Ltd | Administrative & support | 2022 |
| AA Pharma Ltd | Wholesale & retail | 2026 |
| AAA and Friends Ltd | Hospitality | 2025 |
| Aabc Limited | Information & communication | 2001 |
| AAENTERPRISES0 Ltd | Wholesale & retail | 2026 |
| Aalk Property Ltd | Real estate | 2025 |
| Aaps Surgical Ltd | Health & social care | 2023 |
| AB Consulting & Technologies Ltd | Information & communication | 2020 |
| ABC Labs Ltd | Information & communication | 2026 |
| ABK Constructions Services Ltd | Construction | 2023 |
| ABOD2SS Ltd | Transport & logistics | 2026 |
| ABZ Drops Ltd | Transport & logistics | 2026 |
| Ace Delivery Ltd | Transport & logistics | 2026 |
| Aearn Assets Ltd | Real estate | 2026 |
| Aeasa Ltd | Health & social care | 2025 |
| Aeromap Delta Planning Ltd | Professional & scientific | 2025 |
| Afridi Transportation Ltd | Wholesale & retail | 2026 |
| Aimaya Co Ltd | Wholesale & retail | 2026 |
| AJ Fire Ltd | Construction | 2025 |
| Ajuwa Ltd | Health & social care | 2025 |
| Alisahal Ltd | Transport & logistics | 2026 |
| Almair CYF | Professional & scientific | 2013 |
| Almaiyah Clinic Ltd | Other services | 2025 |
| Alorena Ltd | Wholesale & retail | 2025 |
| Alpha Waste Removal Ltd | Construction | 2026 |
| Ammarskitchenn Ltd | Hospitality | 2026 |
| Anna Maria Delivery Ltd | Transport & logistics | 2026 |
| Antar Hamood Ltd | Transport & logistics | 2026 |
| Apex Logistics Group Ltd | Transport & logistics | 2025 |
| APM Cardiff Ltd | Real estate | 2025 |
| AR Delivery Ltd | Transport & logistics | 2026 |
| ARC Fire Sprinklers Ltd | Professional & scientific | 2026 |
| Archway Software Limited | Information & communication | 2026 |
| Argentum Global Ltd | Wholesale & retail | 2020 |
| Aristos Fundraising Ltd | Professional & scientific | 2026 |
| Ashley Drake Publishing Ltd | Information & communication | 1994 |
| Astwinz Properties Ltd | Real estate | 2025 |
| Atlas Relay Ltd | Wholesale & retail | 2026 |
| Atura Studios Ltd | Wholesale & retail | 2025 |
| Audiolyx Ltd | Wholesale & retail | 2025 |
| Aura Sphere Events Ltd | Hospitality | 2026 |
| Authority Limited | Extraterritorial | 2015 |
| Autowheelsdetailing Ltd | Administrative & support | 2025 |
| Avenue Creative Ltd | Professional & scientific | 2021 |
| Awpm Ltd | Professional & scientific | 2026 |
| AWS Legacy Ltd | Real estate | 2025 |
| Ayman TLC Limited | Health & social care | 2022 |
| B0XD-CDF Ltd | Hospitality | 2024 |
| BAB AL Yemen Cardiff Ltd | Hospitality | 2026 |
| Baruh Ltd | Transport & logistics | 2026 |
| Base Worx Ltd | Manufacturing | 2024 |
| Beauty & Aesthetic’S by Sammie-Lou Limited | Other services | 2025 |
| Beckinsale-Uk Ltd | Construction | 2025 |
| Belle Direct Ltd | Wholesale & retail | 2026 |
| Benedict DE LA Pays Ltd | Wholesale & retail | 2024 |
| Berganioai Limited | Professional & scientific | 2026 |
| Bgriffiths Trades Ltd | Wholesale & retail | 2024 |
| Bhinneka Ltd | Hospitality | 2026 |
| Bigtymer Record and Entertainment Ltd | Administrative & support | 2026 |
| Black & White PIG Company Ltd | Manufacturing | 2015 |
| Blackline Clothing Ltd | Wholesale & retail | 2024 |
| Bleddyn Rhys CYF | Information & communication | 2013 |
| Bloomorbit Ltd | Information & communication | 2026 |
| Blossom Concepts Limited | Hospitality | 2026 |
| Bluebird Marketing Ltd | Professional & scientific | 2026 |
| Brecon Shop Ltd | Wholesale & retail | 2025 |
| Broken Barn Ltd | Information & communication | 2023 |
| Bubustreats Ltd | Wholesale & retail | 2026 |
| Building Authority Limited | Extraterritorial | 2021 |
| C W Courier Ltd | Transport & logistics | 2026 |
| CAFE02 Ltd | Hospitality | 2024 |
| Cakery and Foodies Ltd | Wholesale & retail | 2026 |
| Candylion Limited | Information & communication | 2016 |
| Capital Mega Multi-Services Ltd | Transport & logistics | 2026 |
| Cardiff Clean Service Ltd | Administrative & support | 2026 |
| Cardiff Consulting Ltd | Construction | 2022 |
| Cardiff IF ITS Property Maintenance Ltd | Construction | 2023 |
| Cardiff Maintenance Services Ltd | Construction | 2023 |
| Care & Kindness Recruitment Limited | Administrative & support | 2024 |
| Cares International Ltd | Health & social care | 2021 |
| Cavessia Ltd | Wholesale & retail | 2025 |
| Ceddr Infrastructure Partners Ltd | Real estate | 2025 |
| CF3 Plumbing & Heating Ltd | Construction | 2026 |
| CF5 Media CYF | Information & communication | 2020 |
| Cinnamon Treforest Ltd | Hospitality | 2021 |
| CJ Vertex Group Ltd | Wholesale & retail | 2026 |
| CL Tuning Ltd | Wholesale & retail | 2025 |
| Classic Sportswear Ltd | Wholesale & retail | 2026 |
| Click Central Ltd | Professional & scientific | 2026 |
| Cloud 22 Skincare Sanctuary Ltd | Wholesale & retail | 2025 |
| Codecraft IT Ltd | Information & communication | 2026 |
| Commercial Vision Ltd | Wholesale & retail | 2026 |
| Cook’S Heating and Cooling Ltd | Construction | 2023 |