| Aroha House Limited | Exeter | 2007 |
| Aroha Ltd | Crowland | 2023 |
| Arohan Limited | Eastbourne | 2022 |
| Arohi Limited | Glasgow | 2018 |
| Aroma Care People Ltd | Lutterworth | 2015 |
| Aroma Retreats Ltd | Saddleworth | 2021 |
| Aroma Scents Limited | Sevenoaks | 2005 |
| Aroma Thai Therapy Limited | Leeds | 2017 |
| Aromaden Limited | Teddington | 1999 |
| Aromaflex Therapeutic and Medical Services Ltd | Alford | 2024 |
| Aroman Care Services Ltd | Leicester | 2019 |
| Aromata Limited | Bedfordshire | 2002 |
| Aromepur Limited | Walsall | 2008 |
| Arominada Health Ltd | Keymer | 2021 |
| Aron Marcus Oral Health Care Limited | Barnet | 2020 |
| Aron Razvan Limited | St. Leonards-On-Sea | 2017 |
| Arona Health Group Ltd | Halifax | 2024 |
| Arona Holdings Ltd | Leicester | 2024 |
| Arondizuogu Patriotic Union UK Women Wing (AWA) CIC | Thornton Heath | 2024 |
| Aronel Cottage Care Home Ltd | West Sussex | 2003 |
| Aronel Cottage Residential Care Limited | Southampton | 2026 |
| Aronm Limited | Solihull | 2016 |
| Arooba Limited | Birmingham | 2019 |
| Arooba Locum Services Ltd | Glasgow | 2025 |
| Arooj Limited | West Yorkshire | 2003 |
| Arora Care Group Limited | Hounslow | 2020 |
| Arora GI Consulting Ltd | London | 2023 |
| Arora Health Care Limited | Nottingham | 2018 |
| Arora Medical Services Ltd | Stockport | 2025 |
| Arora Medics Ltd | Peterborough | 2021 |
| Aroro Care Limited | Belfast | 2021 |
| Around Childcare Limited | Weeton | 2021 |
| Around the Clock Care Agency Ltd. | Camberley | 2016 |
| Around the Clock FUN Ltd | Altrincham | 2024 |
| Around the Clock Healthcare Ltd | Milton Keynes | 2018 |
| Around YOU Support & Community Services Ltd | Luton | 2022 |
| Arouro Limited | Edinburgh | 2026 |
| Aroxas Ltd | Luton | 2022 |
| Aroy Limited | Wembley | 2015 |
| ARP Dental Care Ltd | Peterborough | 2014 |
| ARP Health Ltd | Leicester | 2022 |
| ARP Human Centric Solutions Ltd | Barnsley | 2016 |
| ARP Locum Services Limited | Cardiff | 2015 |
| ARP Medical Ltd | Sheffield | 2024 |
| ARP Professional Limited | Borehamwood | 2015 |
| Arpan Anaesthetics Ltd | Stockton-On-Tees | 2016 |
| Arpan Consultants Limited | London | 2019 |
| Arpan Foundation | Harrow | 2011 |
| Arpan Healthcare UK Limited | Stockport | 2024 |
| ARPHEM2 Limited | Surrey | 2015 |
| Arpiem Limited | Northwood | 2023 |
| Arpita Chakraborty Limited | Whitchurch | 2023 |
| Arpith Limited | Falkirk | 2019 |
| Arpitha Pereira Ltd | Cardiff | 2026 |
| Arpra Limited | Aylesbury | 2025 |
| ARQ Foundation CIC | London | 2024 |
| Arqam Foundation | London | 2009 |
| ARR Riyadh Limited | Watford | 2016 |
| Arrabon Trust | Plymouth | 2010 |
| Arraffy Limited | Harlow | 2022 |
| Arrahba Limited | Nottingham | 2024 |
| Arran Action Care Ltd | Isle Of Arran | 2022 |
| Arran and Darran Ltd | Purley | 2018 |
| Arran Campbell | Bellshill | 2021 |
| Arran Court (Purley) Ltd | South Croydon | 1994 |
| Arran Friendship Club CIC | Isle Of Arran | 2025 |
| Arran Healthcare Limited | London | 2005 |
| Arran Pharmacy Limited | Glasgow | 2001 |
| Arran Support Limited | Orpington | 2020 |
| Arranejace Limited | Antrim | 2023 |
| Arrange Care Services Ltd | Portsmouth | 2023 |
| Arranmore Imaging Ltd | Oldham | 2015 |
| Arranmore Park Rest Home Ltd | Mexborough | 2020 |
| Arrashid Limited | Chigwell | 2022 |
| Array Academy Limited | Belfast | 2018 |
| Array Care Limited | Iver | 2025 |
| Arrc Health Ltd | London | 2026 |
| Arreta After School Club Ltd. | London | 2018 |
| Arreta Care Limited | Rugeley | 2019 |
| Arreta Child Minder Limited | London | 2018 |
| Arretium Diagnostics Ltd | London | 2025 |
| Arriva Care Services Limited | Gloucester | 2007 |
| Arrk Solutions Ltd | Ashby-De-La-Zouch | 2017 |
| Arro Fitness and Holistic Wellness CIC | Plymouth | 2023 |
| Arrodak International (UK) Ltd | London | 2007 |
| Arrol Dental Laboratory Ltd | 86A George Street | 2015 |
| Arron & Partners Ltd | Halesowen | 2025 |
| Arronax Ltd | Glasgow | 2017 |
| Arronbeth Ltd | Darlington | 2000 |
| Arronbeth Therapeutic Care Limited | Darlington | 2021 |
| Arroprom Therapy Ltd. | Sevenoaks | 2018 |
| Arrow Anaesthesia Limited | Bray On Thames | 2025 |
| Arrow and Bull Ltd | Hove | 2016 |
| Arrow Dental Limited | Rotherham | 2025 |
| Arrow Healthcare Limited | Birmingham | 2015 |
| Arrow Kids Ltd | Bedfordshire, Luton | 2018 |
| Arrow Medical Services Limited | Torphins | 2024 |
| Arrow OH Limited | Prescot | 2023 |
| Arrow Oral Health Ltd | London | 2026 |
| Arrow Orthodontics Limited | Nottingham | 2005 |