| 80 Alexandra House Ltd | Health & social care | 2026 |
| 92 Gladstone Street Limited | Households | 2017 |
| A & C Turkeys Limited | Agriculture & fishing | 2016 |
| A & Co Accountancy and Taxation Services Limited | Professional & scientific | 2026 |
| A & G Mobile Accessories Limited | Wholesale & retail | 2015 |
| A & J Houghton Properties Limited | Construction | 2002 |
| A & L Tree Services Ltd | Agriculture & fishing | 2025 |
| A & M Harris Nursery Limited | Extraterritorial | 2013 |
| A & N Plumbing and Heating Limited | Construction | 2004 |
| A & S Formwork Limited | Construction | 2017 |
| A & S Trading (Blackwood) Limited | Wholesale & retail | 2008 |
| A & S Trading (Wales) Limited | Wholesale & retail | 2003 |
| A & Walker Property Group Limited | Real estate | 2025 |
| A B Demolition (SW) Limited | Professional & scientific | 1997 |
| A Baker Wind Consultancy Ltd | Manufacturing | 2023 |
| A Bros Properties Ltd | Real estate | 2022 |
| A Cause for Paws CIC | Other services | 2025 |
| A Clean Services Limited | Administrative & support | 2004 |
| A D Power Building Services Ltd | Construction | 2014 |
| A D Precision Engineering Limited | Manufacturing | 1998 |
| A Dixon Fencing Contractors Limited | Construction | 2014 |
| A Edwards Roofing Limited | Construction | 2019 |
| A F Thomas Holdings Limited | Financial services | 2025 |
| A Goode Sport Ltd | Arts & recreation | 2010 |
| A Greener Vale Ltd | Administrative & support | 2024 |
| A H Cross & Co Limited | Professional & scientific | 2004 |
| A Hotel Designer Ltd | Professional & scientific | 2025 |
| A I Industries Ltd | Manufacturing | 2015 |
| A J Auto Repairs Limited | Wholesale & retail | 2009 |
| A J Flook Window Cleaning Ltd | Administrative & support | 2018 |
| A J Fouweather Heating & Plumbing Ltd | Construction | 2002 |
| A J Plant Hire & Rentals Ltd | Administrative & support | 2024 |
| A Lleshi Buy & Sell Cars Ltd | Wholesale & retail | 2020 |
| A M Builders IW Ltd | Construction | 2015 |
| A P Day & Sons Ltd | Agriculture & fishing | 2019 |
| A P Tiling Limited | Construction | 2014 |
| A P Walsh Ltd | Wholesale & retail | 2021 |
| A Plus Couriers Ltd | Transport & logistics | 2023 |
| A Print & Design Ltd | Manufacturing | 2003 |
| A Quality Service Ltd | Administrative & support | 2011 |
| A S Consultants Ltd | Professional & scientific | 2009 |
| A S Management Ltd | Wholesale & retail | 2024 |
| A S Store Ltd | Wholesale & retail | 2014 |
| A Smith Electrical (IOW) Ltd | Construction | 2020 |
| A Spooner Builders Limited | Construction | 2009 |
| A Stroke of Genius Limited | Information & communication | 2013 |
| A T Hair Limited | Other services | 2023 |
| A Thomas Property Development Limited | Construction | 2024 |
| A to a Design Consultancy Ltd | Professional & scientific | 2014 |
| A to Z (NPT) Limited | Wholesale & retail | 2023 |
| A Transport Services Ltd | Transport & logistics | 2020 |
| A Z a Security Ltd | Administrative & support | 2025 |
| A&A Bodega Ltd | Wholesale & retail | 2025 |
| A&A Chandra Ltd | Real estate | 2024 |
| A&A DIY Ltd | Construction | 2025 |
| A&A MOT Limited | Wholesale & retail | 2025 |
| A&A Trade in Property Ltd | Real estate | 2021 |
| A&D Sisman Construction Ltd | Construction | 2022 |
| A&E 4X4 Prestige Cars Limited | Wholesale & retail | 2019 |
| A&J Collective Ltd | Hospitality | 2025 |
| A&J Parry Investment Ltd | Real estate | 2022 |
| A&M Harris Ltd | Wholesale & retail | 2017 |
| A&N Food Group Ltd | Manufacturing | 2023 |
| A&P LOW Ltd | Hospitality | 2021 |
| A&R Foods Ltd | Hospitality | 2021 |
| A&S Holdings (Wales) Ltd | Wholesale & retail | 2011 |
| A&S Kotecha Limited | Health & social care | 2015 |
| A&S Road Haulage Ltd | Transport & logistics | 2008 |
| A-O Brewing Company Limited | Manufacturing | 2019 |
| A-Ply Carpentry & Building Limited | Construction | 2008 |
| A-Z Luxury Wigs Limited | Wholesale & retail | 2025 |
| A. K. Shimla Ltd | Hospitality | 2018 |
| A. Schulman Inc. Limited | Manufacturing | 1952 |
| A.B Payne Ltd | Construction | 2019 |
| A.C. Compliance Ltd | Professional & scientific | 2018 |
| A.C. Coolpro Engineering Systems Ltd. | Agriculture & fishing | 1993 |
| A.C.T. Financial Services Ltd | Professional & scientific | 2003 |
| A.Clements Building Limited | Construction | 2018 |
| A.D. Turner & Sons Limited | Wholesale & retail | 2017 |
| A.E. Brown (Farms) Limited | Agriculture & fishing | 1948 |
| A.E. Brown (Holdings) Limited | Professional & scientific | 2021 |
| A.E.T. Extraction Limited | Manufacturing | 2005 |
| A.F. Thomas & Sons Limited | Wholesale & retail | 1960 |
| A.I.O.W. Limited | Manufacturing | 2011 |
| A.J.G. Transport Limited | Transport & logistics | 2002 |
| A.L.P Care & Support CYF | Health & social care | 2020 |
| A.N.T. Aerials & Satellites Ltd | Information & communication | 2006 |
| A.North Blade Repairs Ltd | Manufacturing | 2024 |
| A.O.Locke Securities and Transportation Ltd | Transport & logistics | 2019 |
| A.S Business Solutions Ltd | Wholesale & retail | 2021 |
| A.W.E. (Anderson Water Equipment) Limited | Construction | 1983 |
| A1 Abaya & Sewing Services Ltd | Administrative & support | 2023 |
| A1 Blinds Limited | Administrative & support | 2012 |
| A1 Executive South Wales Limited | Transport & logistics | 2023 |
| A1 Group Holdings Ltd | Real estate | 2020 |
| A1 Vision Limited | Health & social care | 2002 |
| A2B Audio Visual Ltd | Construction | 2022 |
| A2B Cars (Newport) Limited | Other services | 2024 |
| A2B Same Day Services Limited | Transport & logistics | 2013 |
| A2BRESTAURANTS Ltd | Hospitality | 2008 |