| Artefact Design Ltd | Farnham | 2019 |
| Arteixo Limited | London | 2014 |
| Artek National Engineering Consultancy Ltd | Doncaster | 2015 |
| Artemis Access Scaffolding Limited | Uxbridge | 2019 |
| Artemis Accountants Limited | London | 2013 |
| Artemis Aviation Limited | Cullompton | 2024 |
| Artemis Construction Limited | Uxbridge | 2019 |
| Artemis Praesepe Productions Ltd | Bury St. Edmunds | 2025 |
| Artemis Resources & Investments Ltd | London | 2022 |
| Artemis Unit Trust Managers Limited | Edinburgh | 1997 |
| Artex-Blue Hawk Limited | Leicestershire | 1945 |
| Artful Investments Limited | London | 2022 |
| Arthouse Direct Holdings Ltd | Colchester | 2015 |
| Arthritis Matters Ltd | London | 2016 |
| Arthropredictx Ltd | Oxford | 2024 |
| Arthur Black (General Smiths) Limited | Leicester | 2014 |
| Arthur Brett Limited | Birmingham | 2021 |
| Arthur Cambrey Limited | Nottingham | 2005 |
| Arthur Denyer Limited | Sutton Coldfield | 1945 |
| Arthur G. Whitehead (Westminster) Limited | Sutton Coldfield | 1937 |
| Arthur Gresty Limited | Nottingham | 1963 |
| Arthur House (NO 6) Limited | London | 1980 |
| Arthur International Ltd | Beckenham | 2016 |
| Arthur J. Nash Limited | Sutton Coldfield | 2012 |
| Arthur John & Co. Limited | South Glam | 1978 |
| Arthur LEE & Sons (Hot Rolling Mills) Limited | Mitcham | 1948 |
| Arthur Place 1965 Limited | Cowdenbeath | 2014 |
| Arthur S. Nixon and Company | York | 1945 |
| Arthur Wheeler & Co. Limited | Norwich | 2018 |
| Arthut Limited | London | 1999 |
| Artic Blue Waves Ltd | London | 2021 |
| Artic Navigation Holding Limited | London | 2024 |
| Artic Navigation Limited | London | 2024 |
| Artic Wolf Ventures Ltd | London | 2025 |
| Artica Galleries Limited | Birmingham | 2006 |
| Article Holdings Ltd | Norwich | 2021 |
| Article Scout Ltd | London | 2024 |
| Artiem Limited | Wolverhampton | 2023 |
| Artifex Gold Limited | Worthing | 2015 |
| Artifex Systems Limited | Birmingham | 2026 |
| Artificial Grass Company Limited | Newtownards | 2010 |
| Artificial Software Solutions Ltd | Ilford | 2024 |
| Artiko Design Co. Ltd | London | 2025 |
| Artil Limited | London | 2022 |
| Artilligence Ltd | Edgware | 2013 |
| Artindsgn Ltd | Sheffield | 2012 |
| Artios Insights Ltd | Belfast | 2015 |
| Artis Bohemiae Amicis Ltd | London | 2013 |
| Artis UK Limited | Beaconsfield | 2016 |
| Artisan Abode Limited | Bovey Tracey | 2012 |
| Artisan Accountancy Services Limited | London | 2014 |
| Artisan Barfi Limited | Birmingham | 2021 |
| Artisan Business Services Ltd | Swansea | 2001 |
| Artisan Business Software Limited | Croydon | 1997 |
| Artisan Coffee Solutions Ltd | Stratford-Upon-Avon | 2014 |
| Artisan Flooring Design Ltd | Paignton | 2022 |
| Artisan Ginyard Ltd | Poole | 2017 |
| Artisan Group Limited | Harrogate | 2025 |
| Artisan International Limited | London | 2005 |
| Artisan Lane Limited | Morecambe | 2024 |
| Artisan Loaf Co. Ltd | Doncaster | 2026 |
| Artisan Surveyors Limited | Fareham | 2020 |
| Artisanary Ltd | Walsall | 2023 |
| Artism Vista Ltd | Rayleigh | 2022 |
| Artison Forklifts Ltd | Stourbridge | 2006 |
| Artist Charter Limited | Malton | 2018 |
| Artist Logic Ltd | London | 2025 |
| Artist Management Group Limited | London | 1997 |
| Artistique Club Limited | Kington | 2005 |
| Artists in Burnt Clay Limited | Ilford | 2018 |
| Artists in Stone Limited | Ferring | 2004 |
| Artists Rifles Clubhouse Ltd | Woking | 2006 |
| Artizen Ltd | Bristol | 2023 |
| Artl Limited | | 2007 |
| Artlett Limited | Salford | 2003 |
| Artmarine Ltd | Blackpool | 2026 |
| Artmarket Gallery Limited | Cottingham | 2018 |
| Artmis Limited | Bicester | 2014 |
| Artomy Limited | Knutsford | 2016 |
| Artquitec Limited | London | 2025 |
| Artress (UK) Limited | Barnard Castle | 2022 |
| Arts & Business Northern Ireland Services Limited | Belfast | 2011 |
| Arts & Crafts Fairs Limited | Worcester | 2001 |
| Arts Business Services Ltd | King'S Lynn | 2026 |
| Arts Central Ltd | Liverpool | 2025 |
| Arts Professional Limited | London | 2001 |
| Artsbeacon Ltd | Scarborough | 2014 |
| Artsquare.Io (UK) Services Ltd | London | 2017 |
| Artugo Ltd | Esher | 2014 |
| Artun Yachting Ltd | London | 2025 |
| Artur Adam Jablonski Ltd | Leicester | 2024 |
| Artushi Limited | Nuneaton | 2017 |
| Artusi (Deptford) Limited | Ramsgate | 2016 |
| Artwork (Malvern) Limited | Malvern | 1997 |
| Artwork Trade Co., Ltd | West Midlands, England, | 2019 |
| Artworld Logistics Limited | London | 2000 |
| Arty Farky Ltd | Worcester | 2020 |
| Aruba Red Ltd | London | 2021 |
| Arum Tree Services Limited | Aldermaston | 2015 |
| Aruma Group Limited | London | 2024 |