| Apex Cybersecurity Ltd | Information & communication | 2026 |
| Apex Logic Limited | Manufacturing | 2012 |
| Apex Plastering Cotswolds Limited | Construction | 2026 |
| Apex Strategy Group Ltd | Professional & scientific | 2025 |
| Apex Wheels Ltd | Wholesale & retail | 2018 |
| APF Behavioural Ltd | Professional & scientific | 2023 |
| Apolo Sustainability Group Ltd | Financial services | 2023 |
| Aposiopesis Limited | Construction | 2020 |
| Apostrophe Restaurants Limited | Hospitality | 2000 |
| Appdirect U.K. Limited | Administrative & support | 2014 |
| Apple Orchard Close Residents Association Limited | Households | 1997 |
| Applecartlive Ltd | Information & communication | 2011 |
| Appletree Court Northway MC Limited | Real estate | 2014 |
| Applevale Limited | Agriculture & fishing | 2002 |
| Applewoods Holdings Ltd | Real estate | 2025 |
| Appliance Care Service Plan Ltd | Other services | 2026 |
| Applied Approaches Ltd | Information & communication | 2016 |
| Applied Executive Selection Limited | Administrative & support | 1989 |
| Appointees Gloucestershire Ltd | Health & social care | 2023 |
| Appollo Engineering Ltd | Manufacturing | 2006 |
| Approved Letting Scheme Limited | Other services | 1998 |
| Apptigent Limited | Information & communication | 2015 |
| Apricotonline Ltd | Education | 2011 |
| Apriori Technologies UK, Limited | Information & communication | 2015 |
| Apson Holdings Ltd | Financial services | 2024 |
| Apson Limited | Real estate | 2010 |
| Aptitude Fitness and Wellbeing Ltd | Education | 2020 |
| Apts - 109/111 Bath Road Ltd | Real estate | 2025 |
| APW Legal Limited | Professional & scientific | 2020 |
| AQ Insights Limited | Information & communication | 2017 |
| AQA Labs (International) Ltd | Wholesale & retail | 2015 |
| Aqua Detailing Ltd. | Administrative & support | 2015 |
| Aqua Guard Solutions Ltd | Construction | 2024 |
| Aqua Marine & Aviation Ltd | Professional & scientific | 2017 |
| Aqua Operations Limited | Other services | 2020 |
| Aqua T LLP | | 2009 |
| Aquaplane Holdings Limited | Manufacturing | 2021 |
| Aquarius Centre (Management) Limited | Real estate | 2006 |
| Aquarius Ground Support Solutions Ltd | Wholesale & retail | 2021 |
| Aquascape Swimming Pools (Holdings) Limited | Financial services | 2021 |
| Aquascape Swimming Pools Limited | Construction | 1994 |
| Aquatots International Limited | Administrative & support | 2010 |
| Aquatots Limited | Wholesale & retail | 2009 |
| Aqueosoft Limited | Information & communication | 2021 |
| Aquerne Solutions Limited | Information & communication | 2011 |
| AR Management Ltd | Hospitality | 2025 |
| ARA Estates Limited | Real estate | 2019 |
| Arabela Group Limited | Real estate | 2025 |
| Araka Holdco 5 Limited | Financial services | 2021 |
| Araka Holdco 6 Limited | Financial services | 2021 |
| Araka Investco 5 Limited | Financial services | 2021 |
| Araka Investco 6 Limited | Financial services | 2021 |
| Aras Investments Ltd | Real estate | 2022 |
| Arbaltech Ltd | Information & communication | 2022 |
| Arblaster & Clarke Holdings Limited | Financial services | 2014 |
| Arblaster & Clarke Wine Tours Limited | Administrative & support | 1994 |
| Arb’S Barber Shop Ltd | Other services | 2023 |
| ARC & Co. Accountants Limited | Professional & scientific | 2016 |
| ARC Construction (Cheltenham) Ltd | Construction | 2024 |
| ARC Recovery Limited | Wholesale & retail | 2003 |
| Arcadia Design and Construction Limited | Construction | 1989 |
| Arcasma Limited | Professional & scientific | 2010 |
| Arcc Project Consultancy Limited | Other services | 2026 |
| Archer Commodities Ltd | Wholesale & retail | 2021 |
| Archer Recycling Limited | Water & waste | 2012 |
| Archer Training Ltd. | Professional & scientific | 2001 |
| Archers Law (Healthcare) Ltd | Professional & scientific | 2018 |
| Archetypal Software Limited | Information & communication | 2015 |
| Architectural Heritage Limited | Wholesale & retail | 1985 |
| Archstone Ambrosden Limited | Real estate | 2015 |
| Arcopro Ltd | Construction | 2025 |
| Arcrent Properties Limited | Real estate | 1998 |
| Arcs Developments Limited | Real estate | 2024 |
| Arctic Quest Limited | Arts & recreation | 2013 |
| Arctic Warbler Ltd | Arts & recreation | 2001 |
| Arcturus Creative Limited | Professional & scientific | 2020 |
| Ardagh Management Limited | Construction | 2015 |
| Ardagh Property Limited | Real estate | 2022 |
| Ardent Costs Limited | Professional & scientific | 2012 |
| Ardent Global Risks Holdings Limited | Financial services | 2022 |
| Ardent Global Risks Limited | Financial services | 2022 |
| Ardillafoods Limited | Wholesale & retail | 2018 |
| Ardour Logistics Ltd | Transport & logistics | 2020 |
| Argonaut Ventures Limited | Manufacturing | 2025 |
| Argonautilus Limited | Professional & scientific | 2009 |
| Argwyn Ltd | Professional & scientific | 2024 |
| Ariah Properties Ltd | Households | 2025 |
| Arkell & Wills Ltd | Wholesale & retail | 2016 |
| Arkke Ltd | Manufacturing | 2025 |
| Arkle House Limited | Hospitality | 2010 |
| Arkon Services Limited | Manufacturing | 2016 |
| Arlo Homes (Woodville) Limited | Real estate | 2023 |
| Arlo Homes Limited | Real estate | 2009 |
| Arlo Land Limited | Construction | 2017 |
| Arlow & Officer Ltd. | Administrative & support | 2016 |
| Armagedon Clothing Ltd | Wholesale & retail | 2024 |
| Armastone Limited | Households | 1983 |
| Armorum International Limited | Administrative & support | 2015 |
| Armstone Limited | Real estate | 2025 |
| Armstrong Bardin Ltd | Financial services | 2010 |