| Archie's Hardware Ltd | Norwich | 2016 |
| Archiemorpslife Ltd | Ashington | 2024 |
| Archigiano Design Limited | Kenilworth | 2018 |
| Archihope (UK) Ltd | Kenilworth | 2019 |
| Archimed Laboratories Co., Ltd | Beckenham | 2015 |
| Archimedes Pharma UK Limited | London | 1990 |
| Archipelago Azores Limited | Keswick | 2011 |
| Archipelago Consulting Ltd | Cambridge | 2012 |
| Archipelago Global Limited | London | 2014 |
| Architectura Design Limited | Bognor Regis | 2006 |
| Architectural Glass Solutions Limited | Lichfield | 2007 |
| Architectural Intelligence Limited | St. Albans | 2016 |
| Architectural Ironmongery Limited | Abergavenny | 2003 |
| Architectural Joinery Limited | Stockton On Tees | 1976 |
| Architectural Lead & Metal Work Limited | Romford | 2026 |
| Architectural Steel Limited | Manchester | 2025 |
| Architectural Window Tinting Limited | Telford | 2023 |
| Architecture First Ltd | Derby | 2019 |
| Architect’S Tea Limited | London | 2016 |
| Architon Media Graphics Limited | Epsom | 1987 |
| Archive Holdings Ltd | Norwich | 2022 |
| Archiwelt Limited | London | 2016 |
| Archon Innovations Ltd | Sale | 2019 |
| Archreed Limited | Bridgend | 2025 |
| Archstone Investments Ltd | London | 2015 |
| Archus Bidco Limited | Redcliffe | 2023 |
| Archus Holdco Limited | Redcliffe | 2023 |
| Archus Insights Limited | Redcliffe | 2023 |
| Archus the Future of Healthcare Limited | Redcliffe | 2023 |
| Archus the Healthcare Infrastructure Specialist Limited | Redcliffe | 2023 |
| Archway Capital Limited | Christchurch | 2019 |
| Archway Education Limited | Cheadle | 2023 |
| Archway Enterprises Limited | Lancaster | 2006 |
| Archway Ocean UK Limited | Bexhill | 1981 |
| Arclid Computer Services Limited | Siddington Macclesfield | 1999 |
| Arclight Vineyards Ltd | Bristol | 2025 |
| Arco (G.B.) Limited | Hull | 1985 |
| Arco Atholl Limited | Glasgow | 1949 |
| Arco Central Limited | Hull | 1986 |
| Arco Cleveland Limited | Hull | 1964 |
| Arco Gilpins Limited | Newtownabbey | 1940 |
| Arco Group Limited | Hull | 1950 |
| Arco Holdings Limited | Hull | 1953 |
| Arco Hollman Nicholls Limited | Hull | 1951 |
| Arco Humberside Limited | Hull | 1946 |
| Arco Iris UK Ltd | Watford | 2008 |
| Arco MTM Limited | Hull | 1979 |
| Arco Tyne and Wear Limited | Hull | 1957 |
| Arco West Midlands Limited | Hull | 1966 |
| Arcon Limited | Bury | 2021 |
| Arcon Plant Limited | Leeds | 1983 |
| Arcovian Ltd | Alcester | 2026 |
| Arcq Community Interest Company | London | 2017 |
| Arcross Limited | York | 2010 |
| Arcs Automotive Limited | Harrow | 2016 |
| Arctech Innovation Limited | Edinburgh | 2026 |
| Arctic Exotic Invest Limited | London | 2017 |
| Arctic Exotic Limited | London | 2017 |
| Arctic Nominees Limited | Bruton | 2019 |
| Arcticcatblindexperts International Ltd | London | 2019 |
| Arctirion UK Ltd | Essex | 2026 |
| Arctur Yachting Ltd | London | 2023 |
| Arcturus Productions Limited | London | 2015 |
| Arcuatura Ltd | Weymouth | 2023 |
| Arcwave Global Ltd | Crawley | 2025 |
| ARD Lifestyle Ltd | Wolverhampton | 2025 |
| Ardagh (UK) 2017 Trustee Limited | Knottingley | 2015 |
| Ardagh Associates Limited | Ashtead | 2016 |
| Ardani Ltd | London | 2022 |
| Ardban Belfast Limited | Portadown | 2013 |
| Ardbana Services Ltd | Portstewart | 2003 |
| Ardcombe Limited | Salford | 2001 |
| Ardea International Ltd. | Henfield | 2016 |
| Ardeley Faraday Limited | Dunmow | 2020 |
| Arden Chambers Limited | London | 1993 |
| Arden Equities Limited | Manchester | 2018 |
| Arden Footwear Limited | Stratford-Upon-Avon | 2015 |
| Arden Forest Group Ltd | Alcester | 2022 |
| Arden Partners Asset Management Limited | Manchester | 2009 |
| Arden Partners EBT Limited | Manchester | 2004 |
| Arden Racing Limited | Banbury | 2020 |
| Arden Silver Ltd | Plymouth | 2015 |
| Arden Wealth Management Limited | Manchester | 2018 |
| Ardene House VET Practice Ltd | Fife | 2011 |
| Ardenpeak Digital Ltd | Doncaster | 2026 |
| Ardent Capital Ltd | Cheadle | 2022 |
| Ardent Engineers Ltd | London | 2020 |
| Ardent Hawthorne Limited | York | 2026 |
| Ardent Management NO.11 Limited | Waltham Cross | 2022 |
| Ardent People Group Ltd | London | 2021 |
| Ardentia Ltd | Eastbourne | 2018 |
| Ardenton Care Propco Limited | Leeds | 2020 |
| Ardess Demesne Limited | Coleraine | 2006 |
| Ardeus Limited | Manchester | 2021 |
| Ardex Construction Limited | Manchester | 2021 |
| Ardfin Capital Ltd | London | 2023 |
| Ardgonnell Farm Ltd | Armagh | 2022 |
| Ardgowan Developments Limited | Greenock | 2005 |
| Ardilea Investments Ltd | Donacloney | 2012 |
| Ardmhor Limited | Inverness | 2016 |