| Arnold Diggle and Co Ltd | Ulverston | 2013 |
| Arnold Innovations Ltd | Mildenhall | 2025 |
| Arnold IT Consultancy Ltd | Birmingham | 2024 |
| Arnold KAR Ltd | Leicester | 2025 |
| Arnold Medicals UK Ltd | Telford | 2019 |
| Arnold Music Publishing Limited | London | 2013 |
| Arnold Support Services Limited | Wokingham | 2001 |
| Arnoldlinks Ltd | Goole | 2015 |
| Arnor Ltd | London | 2025 |
| Arnox IT Limited | London | 2002 |
| Arnsoft Limited | Hatfield | 2018 |
| Arnvik IT Ltd | Crawley | 2016 |
| Arnze Limited | Chesterfield | 2019 |
| ARO Productions Limited | Windermere | 2015 |
| Aroa Services Ltd | Macclesfield | 2018 |
| Aroai Health Limited | Wetherby | 2019 |
| Arockia IT Solutions Limited | Amersham | 2012 |
| Arocl Limited | Wimborne | 2023 |
| Aroclave Limited | London | 2015 |
| Aroco Limited | Hove | 2020 |
| Aroe Films Ltd | London | 2008 |
| Aroeye Ltd | Macclesfield | 2019 |
| Arogya Labs Ltd | London | 2025 |
| Aroha Technologies UK Ltd | Bonnyrigg | 2024 |
| Arola IT Ltd | Essex | 2017 |
| Aroma Group Ltd | London | 2025 |
| Aroma Life Limited | London | 2016 |
| Aromachat Productions Ltd | Royston | 2014 |
| Aromakh Soft Ltd | London | 2024 |
| Aromantic Education Limited | Elgin | 2016 |
| Aromates Limited | Sheffield | 2018 |
| Aromathy Ltd | Belfast | 2026 |
| Aromatic Media Limited | Peterborough | 2016 |
| Aromatik Music Ltd | Birmingham | 2022 |
| Arome Ltd | Hexham | 2000 |
| Aron Tech Contracts Ltd | Luton | 2023 |
| Aron Tech Ltd | Largs | 2019 |
| Aronaro Labs Ltd | Nottingham | 2026 |
| Aronautic Limited | London | 2022 |
| Arondis Limited | Selsley | 2021 |
| Arondite Ltd | London | 2023 |
| Arone Consulting Ltd | Esher | 2024 |
| Aronet-International Ltd | Richmond | 2025 |
| Aronkiee Consultant Ltd | Dagenham | 2025 |
| Aronova Interactive Limited | Sutton | 2003 |
| ARONTECH1 Limited | Staines-Upon-Thames | 2026 |
| Aroo Audio & Broadcast Ltd | Bolton | 2024 |
| Aroole Ltd | London | 2025 |
| Aroona Ltd | Portsmouth | 2016 |
| Arooth Trading House Limited | London | 2013 |
| Aropama Ltd | Newcastle Upon Tyne | 2013 |
| Aropl Studios Ltd | Crewe | 2021 |
| Aroquad Ltd | Milton Keynes | 2016 |
| Arora Digital Ltd | London | 2018 |
| Arora IT Services Limited | Romford | 2022 |
| Arora IT Solution Limited | Smethwick | 2026 |
| Arora Venture Holdings Ltd | Slough | 2024 |
| Arora's Group Limited | Watford | 2020 |
| Arori Tech and Consultancy Services Ltd | London | 2022 |
| Arorsa Ltd | Iver | 2018 |
| Aros Analytics Ltd | London | 2022 |
| Aros Corporation Limited | Pewsey | 2011 |
| Aros Solutions Limited | Harrow | 2025 |
| Arosan Solutions Ltd | Ilford | 2017 |
| Arosha Ltd | Southampton | 2024 |
| Arosi Limited | Bury St. Edmunds | 2025 |
| Arotrax Solutions Limited | Cardiff | 2025 |
| Arou Ltd | High Wycombe | 2024 |
| Around About Limited | Coxley | 2008 |
| Around Advertising Ltd | Benfleet | 2026 |
| Around and About Limited | Chorley | 2008 |
| Around Crypto Ltd | London | 2022 |
| Around Saddleworth Magazine Ltd | Blackpool | 2010 |
| Around the Clock Marketing and Events Limited | Crediton | 2019 |
| Around the Clock Records Ltd | London | 2023 |
| Around the World in 80 Games Ltd | London | 2026 |
| Around the World Limited | London | 1994 |
| Around the World Productions Limited | | 1988 |
| Aroundinteger Ltd | Swansea | 2025 |
| Aroundu Ltd | Bedford | 2025 |
| Arova Consulting Limited | Watford | 2026 |
| Arovix Ltd | London | 2026 |
| Arowana International UK Limited | London | 2017 |
| Arowana Technologies Limited | Huddersfield | 2014 |
| Aroxo Ltd | London | 2006 |
| Aroyb-Tech Ltd | Mitcham | 2025 |
| ARP Consulting Limited | Tring | 2018 |
| ARP Digital Limited | London | 2016 |
| ARP Enterprises Limited | London | 2017 |
| ARP Events Ltd | Wolverhampton | 2025 |
| ARP Global Ltd | Milton Keynes | 2013 |
| ARP Infotech Ltd | Purley | 2026 |
| ARP Investhub Limited | Bromley | 2024 |
| ARP Logic IT Services Limited | Chertsey | 2018 |
| ARP Media Limited | Harlesden | 2016 |
| ARP Media Services Ltd | London | 2024 |
| ARP Music Limited | Thame | 2016 |
| ARP Network Solutions Ltd | Southampton | 2024 |
| ARP Professional Services Limited | London | 2024 |
| ARP Services Professional Ltd | Shropshire | 2015 |