| AFR Consulting Limited | Information & communication | 2014 |
| Africa Diasporas Property Ltd | Construction | 2025 |
| Afridi Associates Ltd | Health & social care | 2025 |
| Afrifest Newport CIC | Administrative & support | 2025 |
| Afrimak CYF | Wholesale & retail | 2019 |
| Afrin Kebab Ltd | Hospitality | 2018 |
| Afro Cenedi CIC | Arts & recreation | 2025 |
| Afro Lounge Bristol Ltd | Hospitality | 2025 |
| Afro Lounge Ltd | Hospitality | 2022 |
| Afro Wight Ltd | Wholesale & retail | 2024 |
| Afsearch Ltd | Administrative & support | 2019 |
| After Premise Ltd | Information & communication | 2014 |
| After YOU Gwent Limited | Hospitality | 2024 |
| AGB Holdings (South Wales) Ltd | Other services | 2024 |
| AGD Healthcare Limited | Health & social care | 2021 |
| AGE Concern Isle of Wight | Administrative & support | 2007 |
| AGF Logistics Ltd | Transport & logistics | 2026 |
| Agg-Fix Maintenance Limited | Manufacturing | 2019 |
| Agile Kinetic Limited | Information & communication | 2016 |
| Agile Link Limited | Administrative & support | 2015 |
| Agile Software Consultancy Ltd | Information & communication | 2018 |
| Agile Testing SW Ltd | Information & communication | 2015 |
| Agria Control Limited | Professional & scientific | 2021 |
| AH Consultants (AHC) Ltd | Health & social care | 2026 |
| Ah&K Ltd | Administrative & support | 2022 |
| AH10 Promotions Ltd | Arts & recreation | 2020 |
| AHD Group Ltd | Construction | 2025 |
| Aherne GAS & Renewables Ltd | Construction | 2025 |
| AHF PAT Testing Wales Limited | Professional & scientific | 2026 |
| Ahmi Limited | Wholesale & retail | 2025 |
| Ahroma Ltd | Wholesale & retail | 2025 |
| AHS Medical Services Ltd | Health & social care | 2019 |
| AHU (SW) Limited | Wholesale & retail | 2024 |
| AI Tools Ltd | Extraterritorial | 2023 |
| Aiprotrix Ltd | Information & communication | 2021 |
| Air Berlin Holding Limited | Transport & logistics | 2007 |
| Airbond Limited | Manufacturing | 2002 |
| Airborne Consulting Ltd | Professional & scientific | 2023 |
| Airbus Defence Limited | Public administration | 2026 |
| Airbus Endeavr Wales | Professional & scientific | 2010 |
| Airbus Protect Limited | Professional & scientific | 2011 |
| Airens Group Ltd | Information & communication | 2026 |
| Airfreedom Cleaning Services Ltd | Administrative & support | 2024 |
| Airfreedom Property Investment Ltd | Real estate | 2024 |
| Airlease Aviation Services Ltd | Manufacturing | 2022 |
| Airmails Limited | Wholesale & retail | 2016 |
| Aironix Ventilation Ltd | Construction | 2025 |
| Airport Expert Ltd | Transport & logistics | 2021 |
| Airport Transfers (Wales) Ltd | Transport & logistics | 2014 |
| Airport Van Luxury Ltd | Transport & logistics | 2025 |
| Airtech Ventilation Limited | Construction | 1986 |
| Aisle of Style Barber Ltd | Other services | 2019 |
| AJ (Isle of Wight) Limited | Construction | 2019 |
| AJ Homes Property Management Ltd | Real estate | 2025 |
| AJ Majer Limited | Administrative & support | 2025 |
| AJ O'Neill Wealth Consultancy Ltd | Professional & scientific | 2026 |
| AJ Planning and Development Ltd | Professional & scientific | 2016 |
| AJ Renovations & Developments Ltd | Real estate | 2025 |
| AJ Total Sourcing Ltd | Professional & scientific | 2025 |
| AJ Wells & Sons Group Limited | Financial services | 2020 |
| Aj's Kickboxing Academy Limited | Arts & recreation | 2021 |
| AJA Group Holdings Ltd | Financial services | 2023 |
| AJB Urology Limited | Health & social care | 2022 |
| Ajbrewster Ltd | Construction | 2026 |
| AJC ISO Solutions Ltd | Professional & scientific | 2025 |
| AJCC99 Ltd | Arts & recreation | 2023 |
| AJD Properties and Developments Ltd | Households | 2023 |
| AJG Services Ltd | Manufacturing | 2022 |
| Ajjcentral Ltd | Wholesale & retail | 2026 |
| AJK Civil Engineering Ltd | Professional & scientific | 2023 |
| AJK Maintenance Ltd | Construction | 2025 |
| AJK Network Engineering Ltd | Professional & scientific | 2023 |
| AJK Telecoms & Civils Limited | Information & communication | 2019 |
| Ajke Geotechnical Limited | Professional & scientific | 2026 |
| AJM (IOW) Limited | Administrative & support | 2015 |
| AJM Embroidery and Print Limited | Manufacturing | 2019 |
| AJM Haulage Ltd | Transport & logistics | 2022 |
| AJP Embroidery & Sportswear Ltd | Wholesale & retail | 2016 |
| AJP Financial Consultancy Limited | Professional & scientific | 2016 |
| AJS Superstore (NPT) Ltd | Wholesale & retail | 2020 |
| Ajsw Holdings Ltd | Financial services | 2025 |
| AJW Property Services Limited | Administrative & support | 2017 |
| AJY Construction Ltd | Construction | 2023 |
| AK Contract Furniture Ltd | Wholesale & retail | 2023 |
| AK Motors Mots, Servicing and Repairs Limited | Wholesale & retail | 2024 |
| AK Transport Consulting Limited | Professional & scientific | 2025 |
| Ak-Kur Furniture & Fitting Ltd | Wholesale & retail | 2018 |
| AK84 Properties Limited | Real estate | 2026 |
| Akasia J4 Limited | Real estate | 2021 |
| Akcr Limited | Financial services | 2024 |
| Akerman Automotive Limited | Wholesale & retail | 2023 |
| AKO Removals Ltd | Transport & logistics | 2026 |
| Akpin Limited | Professional & scientific | 2004 |
| Akprettypudsnewport Ltd | Manufacturing | 2024 |
| AKR 330 Limited | Real estate | 2021 |
| AKV Home Improvements Ltd | Construction | 2026 |
| AL Mukh Ltd | Wholesale & retail | 2025 |
| AL Shifa Project CIC | Health & social care | 2026 |
| AL Usra Ltd | Education | 2017 |
| Al-Hamdan Properties Ltd | Real estate | 2022 |