| A Norton Building Ltd | Construction | 2021 |
| A P Cymru - Creating Opportunities & Celebrating Difference Ltd | Health & social care | 2012 |
| A P Harding Ltd | Transport & logistics | 2015 |
| A P Mechanical Ltd | Construction | 2015 |
| A P Rail Consultancy Limited | Other services | 2014 |
| A Pair of Drips Ltd | Construction | 2025 |
| A Parton Consultancy Limited | Professional & scientific | 2013 |
| A Performance Ltd | Wholesale & retail | 2018 |
| A R Carpenter 1 Limited | Construction | 2019 |
| A R Catering Manchester Ltd | Hospitality | 2016 |
| A R D Haulage Services Limited | Transport & logistics | 2019 |
| A R Landscapers Limited | Administrative & support | 2017 |
| A RAH Locums Ltd | Wholesale & retail | 2025 |
| A Rahman Properties Ltd | Real estate | 2019 |
| A Rapid Response Security Ltd | Other services | 2011 |
| A Recycling Ltd | Water & waste | 2021 |
| A Rose Property Development Limited | Construction | 2021 |
| A S Tiling Limited | Construction | 2018 |
| A Space in the City Ltd | Real estate | 2005 |
| A Star Cafe Ltd | Hospitality | 2024 |
| A Star Music Education Ltd | Education | 2015 |
| A Star Shipping Limited | Transport & logistics | 2025 |
| A Step UP Flooring Ltd | Wholesale & retail | 2023 |
| A Tate Ltd | Health & social care | 2026 |
| A Taxi Rentals Limited | Wholesale & retail | 2026 |
| A Team Fabrications Ltd | Manufacturing | 2012 |
| A Team Insulation Ltd | Construction | 2018 |
| A Thom Ltd | Administrative & support | 2019 |
| A to 1 Limited | Health & social care | 2001 |
| A to B Removals South Wales Ltd | Transport & logistics | 2025 |
| A to F Kitchen Ltd | Hospitality | 2026 |
| A to Z (2021) Limited | Households | 2021 |
| A to Z 110 Autoparts Ltd | Wholesale & retail | 2019 |
| A to Z Logistical Services Ltd | Transport & logistics | 2019 |
| A Touch of Sparkle Ltd | Administrative & support | 2023 |
| A Travellink Limited | Transport & logistics | 2015 |
| A True Product Limited | Professional & scientific | 2005 |
| A U Brothers Limited | Wholesale & retail | 2016 |
| A Watkins Building Services Limited | Construction | 2017 |
| A World of Whiskey Limited | Wholesale & retail | 2020 |
| A Yinglunyougou Ltd | Hospitality | 2024 |
| A Z I Motors Ltd | Wholesale & retail | 2022 |
| A Z Real Estate Holdings Limited | Households | 2023 |
| A&A Development (Cardiff) Limited | Real estate | 2017 |
| A&A Medical Enterprise Limited | Health & social care | 2025 |
| A&A Spedition Ltd | Transport & logistics | 2021 |
| A&A Transport Ltd | Transport & logistics | 2017 |
| A&A.It Ltd | Information & communication | 2019 |
| A&B Dent Ltd | Health & social care | 2017 |
| A&B Property Solutions Ltd | Real estate | 2019 |
| A&B Zephyr Ltd. | Professional & scientific | 2014 |
| A&C Management Services Ltd | Hospitality | 2018 |
| A&D Aesthetics Ltd | Other services | 2023 |
| A&D Mobile Diagnostics Ltd | Wholesale & retail | 2016 |
| A&D Orthopaedics Ltd | Health & social care | 2025 |
| A&D Residence Ltd | Hospitality | 2026 |
| A&D Summers Ltd | Administrative & support | 2013 |
| A&F Traders Ltd | Wholesale & retail | 2019 |
| A&F Vintage Ltd | Wholesale & retail | 2026 |
| A&G Property Management Ltd | Households | 2019 |
| A&G Restaurants Limited | Hospitality | 2017 |
| A&Guerida Ltd | Wholesale & retail | 2025 |
| A&H Digital Ltd | Other services | 2025 |
| A&H Takeaway Ltd | Hospitality | 2019 |
| A&I Accounting Ltd | Other services | 2019 |
| A&I Cars Cardiff Ltd | Wholesale & retail | 2025 |
| A&I Marketing Limited | Professional & scientific | 2017 |
| A&J (UK) International Co., Ltd. | Professional & scientific | 2005 |
| A&J Property Maintenance Ltd | Construction | 2018 |
| A&J Travel Ltd | Administrative & support | 2022 |
| A&Jfields Ltd | Agriculture & fishing | 2025 |
| A&K Construction Group Ltd | Construction | 2015 |
| A&K Management NE Limited | Wholesale & retail | 2018 |
| A&K-Tape Ltd | Construction | 2013 |
| A&L Mobile Tyres Limited | Wholesale & retail | 2024 |
| A&L Tiling Limited | Construction | 2021 |
| A&M Auto Repairs Ltd | Wholesale & retail | 2020 |
| A&M Diamonds Gold Limited | Mining & quarrying | 2021 |
| A&M Group Marine Ltd | Manufacturing | 2025 |
| A&M Hospitality Group Limited | Hospitality | 2021 |
| A&M Painting&Cleaning Ltd | Construction | 2025 |
| A&M Property Investment Holdings Ltd | Real estate | 2025 |
| A&N Print Limited | Manufacturing | 2008 |
| A&N Property Ltd | Real estate | 2011 |
| A&N PVT Ltd | Health & social care | 2023 |
| A&N Sports Ltd | Wholesale & retail | 2025 |
| A&Np Ltd | Health & social care | 2025 |
| A&O Health Clinics Ltd | Health & social care | 2022 |
| A&R Dwellings Ltd | Real estate | 2019 |
| A&R Minibus Hire Ltd | Transport & logistics | 2025 |
| A&S Desserts Limited | Manufacturing | 2025 |
| A&S Foods Services Ltd | Hospitality | 2025 |
| A&S Loft Conversion Limited | Construction | 2023 |
| A&S Sawadeeka Ltd | Hospitality | 2018 |
| A&U Foods Limited | Hospitality | 2025 |
| A&U Investments Ltd | Extraterritorial | 2020 |
| A&V.Construction Ltd | Construction | 2018 |
| A-E-School Transport Limited | Transport & logistics | 2014 |
| A-Eon Technology Ltd | Manufacturing | 2012 |
| A-Limex Ltd | Wholesale & retail | 2025 |