| Arun Kumar Verma Ltd | Birmingham | 2016 |
| Aruna Accountancy Services Limited | Haslemere | 2010 |
| Aruna Accountants Limited | Haslemere | 2010 |
| Aruna Groups Limited | Haslemere | 2011 |
| Aruna Property Management Limited | Haslemere | 2018 |
| Arunalu Ltd | Wigston | 2014 |
| Arundel 1960 Limited | High Wycombe | 2013 |
| Arundel Lodge RTM Company Limited | Worthing | 2025 |
| Arundel Militaria Limited | Knighton | 2005 |
| Arundel Road 1961 Limited | Birmingham | 2014 |
| Arunlex Limited | London | 1990 |
| Arunpeak Limited | London | 1975 |
| ARV 1964 Ltd | Dunoon | 2012 |
| Arvas Limited | Towcester | 2009 |
| Arvensis Packaging Films Limited | Keighley | 2006 |
| Arvids Servicetjenester Limited | London | 2021 |
| Arvill Limited | Lanarkshire | 1986 |
| Arvin Management Consultants Limited | Ilford | 2013 |
| Arvindson Capital Partners Ltd | Coventry | 2021 |
| Arvor Investments Limited | Great Yarmouth | 2013 |
| Arvun Limited | Wilmslow | 2017 |
| Arvy Construction & Renovations Ltd | Godalming | 2023 |
| ARW Wealth Managers Ltd | Norwich | 2001 |
| Arwa Ahmed Trade Co., Ltd | London | 2024 |
| Arwen Design and Development Limited | Peterborough | 1988 |
| Arxenix Ltd | Bolton | 2015 |
| Arxion Ltd | Wolverhampton | 2025 |
| Arxs Group Ltd. | Wembley | 2016 |
| Ary&Bogdy Trans Limited | Coventry | 2014 |
| Arya Marine Ltd | London | 2022 |
| Arya Yachting Ltd | London | 2024 |
| Aryana Properties Limited | Cardiff | 2012 |
| AS & S Properties Ltd. | Brighton | 2008 |
| AS Fit AS Limited | South Croydon | 2021 |
| AS Formations Ltd | Norwich | 2022 |
| AS Good AS IT Gets (Catering) Ltd | Bicester | 2025 |
| AS Scaffolding (Hire & Sales) Ltd | Glasgow | 2011 |
| AS Seen Online Limited | London | 2004 |
| As.Ii.Am Limited | Dagenham | 2022 |
| AS44445 Ltd | London | 2025 |
| AS7 Group Ltd | Bury St. Edmunds | 2025 |
| Asadify X Limited | Rotherham | 2024 |
| Asaf (Whitby) Ltd | Whitby | 2018 |
| Asami Matsuda Ltd | London | 2013 |
| Asan International Co., Ltd. | Beckenham | 2020 |
| Asan Ltd | Reading | 2014 |
| Asante Bakes Limited | Edgware | 2023 |
| Asante Hiking Limited | Maldon | 2020 |
| Asante-It Limited | London | 2022 |
| Asap Analgesia Ltd | Huddersfield | 2024 |
| Asaryasoft Ltd | London | 2024 |
| Asatis Ltd | London | 2013 |
| Asaurus REX Ltd | Ipswich | 2025 |
| Asbestology Ltd | Rossendale | 2016 |
| Asbestos Action Scotland Limited | Glasgow | 2018 |
| Asbestos Coatings Environmentally Removed Limited | Broadstairs | 2010 |
| Asbestos Consultancy Ltd | Blandford Forum | 2022 |
| Asbestos in Homes Limited | Lincoln | 2010 |
| Asbestos Solutions (North Wales) Limited | Llandudno | 2006 |
| Asbestosurv Ltd | Bristol | 2026 |
| Asbo Performance Ltd | Gravesend | 2023 |
| Asbro Limited | London | 2025 |
| Asbury Harlow Buckley Tax & Accounts Ltd | Alderholt | 2015 |
| ASC Mobility Limited | Preston | 2005 |
| ASC Sixteen Limited | Coventry | 2016 |
| ASC Thirty One Limited | Coventry | 2025 |
| ASC Twenty Eight Limited | Coventry | 2021 |
| ASC Twenty Three Ltd | Coventry | 2020 |
| Ascadina Ltd | London | 2019 |
| Ascendant Consulting Limited | London | 2022 |
| Ascendant Trading Co., Limited | Beckenham | 2015 |
| Ascendia Education Ltd | Doncaster | 2026 |
| Ascendia Enterprises Ltd | London | 2025 |
| Ascending Tribe Limited | Poole | 2022 |
| Ascent Computing Limited | Stockport | 2016 |
| Ascent NLP Ltd. | Livingston | 2002 |
| Ascent Perfumes Ltd | Macclesfield | 2011 |
| Ascenta Capital Limited | London | 2026 |
| Ascenta Group Limited | Beckenham | 2023 |
| Ascenti Wellbeing Limited | Fareham | 2017 |
| Ascentia Learning Limited | Earlswood | 2012 |
| Ascento Trustee Limited | Dronfield | 2021 |
| Ascert Consulting Limited | Halesowen | 2010 |
| Ascerta Consulting Ltd | St. Helens | 2011 |
| Asclepius Global Limited | London | 2012 |
| Asclepius Managed Services Limited | London | 2012 |
| Ascol Limited | Nottingham | 2000 |
| Ascot Capital Partners Limited | Steyning | 2013 |
| Ascot Care (Coach House) Limited | South Shields | 2025 |
| Ascot Celebrity Canines Limited | Woodford Green | 2014 |
| Ascot Consulting (UK) Ltd | Leamington Spa | 2007 |
| Ascot Drummond Directors Limited | Borehamwood | 1999 |
| Ascot Drummond Nominees Limited | Borehamwood | 2001 |
| Ascot Drummond Secretarial Limited | Borehamwood | 1999 |
| Ascot Employees Corporate Member Limited | London | 2012 |
| Ascot Group Investment Company Limited | Liverpool | 2012 |
| Ascot House Limited | Bangor | 1985 |
| Ascot Publishing Limited | Glasgow | 2009 |
| Ascot Villa Limited | Birmingham | 2014 |
| Ascotash Ltd | Wokingham | 2024 |