| Aragsan Care Ltd | London | 2021 |
| Arain Associates Ltd | Manchester | 2025 |
| Arain Medical Ltd | Manchester | 2021 |
| Araj Imaging Solutions Limited | Nantwich | 2019 |
| Arakadayil Limited | Chigwell | 2019 |
| Arakan Rohingya National Organisation | Ilford | 2015 |
| Arako Limited | Sutton Coldfield | 2023 |
| Araktey Limited | Blackburn | 2019 |
| Arale Group Limited | London | 2016 |
| Aralikatti Limited | Rowley Regis | 2011 |
| Aram Anaesthetic Services Limited | Manchester | 2014 |
| Aramead Limited | Gravesend | 2018 |
| Aramedic Limited | Enfield | 2016 |
| Arami Consulting Ltd | Sleaford | 2022 |
| Aramé Dental Atelier Limited | London | 2025 |
| Aran Community Services Limited | Herts | 2004 |
| Aran Homes Limited | Southgate | 1998 |
| Aran's Space Limited | Attleborough | 2026 |
| Aranathan Limited | Chertsey | 2020 |
| Arandal Properties Limited | Caterham | 2010 |
| Arandce Limited | Wrexham | 2011 |
| Aranini Health Ltd | London | 2023 |
| Aranvale Living Ltd | Huddersfield | 2025 |
| Aranya Care Limited | Warlingham | 2025 |
| Araoluwa Limited | Dartford | 2024 |
| Arap Medic Ltd | Newport | 2023 |
| Ararat Restorative Limited | Harrow | 2024 |
| Aras Services Limited | Ilford | 2026 |
| Arasa Limited | Hull | 2024 |
| Arasasingham Ltd | Ilford | 2023 |
| Arasto Ltd | Teddington | 2016 |
| Arat Care Ltd | London | 2019 |
| Arateus Healthcare Ltd | Twickenham | 2022 |
| Arauf Limited | Bolton | 2009 |
| Araujo & Caria Ltd | Bristol | 2013 |
| Aravind Sampath Ltd | Reading | 2015 |
| Arawak Medical Limited | Philadelphia | 2019 |
| Arayz Ltd | Huddersfield | 2024 |
| ARB Cassidy Limited | Brentwood | 2021 |
| ARB Doctors Limited | Gerrards Cross | 2018 |
| ARB Medic Ltd | Leicester | 2023 |
| ARB Medical Limited | Romford | 2016 |
| ARB Medical Services Limited | Lochgilphead | 2021 |
| Arbennek Healthcare Ltd | Roche | 2022 |
| Arberglen Limited | Perth | 1990 |
| Arbi Healthcare Ltd | Bradford | 2026 |
| Arbient Limited | Essex | 2025 |
| Arbm Enterprises Ltd | Bury St. Edmunds | 2025 |
| Arbor Health Limited | Manchester | 2026 |
| Arbor Healthcare Group Limited | Thornton Cleveleys | 2025 |
| Arbor Life Limited | Wolverhampton | 2024 |
| Arbor Medical Limited | Harrogate | 2023 |
| Arbor Neurorehabilitation Services Ltd | Bristol | 2023 |
| Arbor Vitamins Ltd | London | 2022 |
| Arboretum Psychotherapy Ltd | Lincoln | 2023 |
| Arboretum House Limited | Walsall | 2022 |
| Arboretum Nursing Home Limited | Brierley Hill | 2008 |
| Arboria Therapy Ltd | Heswall | 2025 |
| Arborvitae Care Services Ltd | Liverpool | 2023 |
| Arborvitae Chinese Medical Centre Ltd. | Wiltshire | 2011 |
| Arbour Cardiology Limited | Market Drayton | 2016 |
| Arbour Clinic Limited | Stroud | 2018 |
| Arbours Association Limited | London | 1972 |
| Arbra Services Limited | Keighley | 2014 |
| Arbury Acupuncture Limited | Royston | 2024 |
| Arbuthnot Medical Limited | Droitwich | 2012 |
| Arbz Healthcare Ltd | Birmingham | 2026 |
| Arbz Holdings Company Ltd | Birmingham | 2026 |
| ARC & KIN Ltd | Leeds | 2025 |
| ARC Adoption North East Limited | Wearfield Sunderland | 2013 |
| ARC Beauty Lounge Ltd | Motherwell | 2025 |
| ARC Care (Northants) Ltd | Northampton | 2025 |
| ARC Care Ltd | Swindon | 2020 |
| ARC Care Services Ltd | Birmingham | 2025 |
| ARC Care Support Ltd | London | 2024 |
| ARC Community Care Ltd | Lytham St. Annes | 2001 |
| ARC Day Activities Ltd | Slough | 2021 |
| ARC Dental Limited | Chester | 2014 |
| ARC EAR Care Ltd | Watford | 2024 |
| ARC Educational Psychology Ltd | London | 2024 |
| ARC HD Services Limited | Widnes | 2010 |
| ARC Health and Wellbeing Services Ltd | Shildon | 2022 |
| ARC Healthcare and Education Limited | Chester Le Street | 2023 |
| ARC Healthcare Ltd | Waterlooville | 2019 |
| ARC Healthcare Southwest | Penryn | 2017 |
| ARC Healthy Living Centre Limited | Co Fermanagh | 2000 |
| ARC Medicals Ltd | Pontypridd | 2016 |
| ARC Occupational Health Limited | Chesterfield | 2025 |
| ARC Orthodontics Limited | Eastbourne | 2008 |
| ARC Osteopathy and Health Limited | Epsom | 2016 |
| ARC Psychology Practice Limited | Lytham St. Annes | 2022 |
| ARC RB Limited | Barry | 2025 |
| ARC SEN Family Support CIC | Bury St. Edmunds | 2025 |
| ARC Smile Ltd | Tranent | 2019 |
| ARC Surgery Limited | Gateshead | 2021 |
| ARC Voyage Ltd | Enfield | 2025 |
| Arc-Therapy Ltd | Birmingham | 2025 |
| Arca & AST Limited | Portsmouth | 2022 |
| Arca Health Limited | Birmingham | 2016 |
| Arcadent Ltd | Tunbridge Wells | 2025 |