| ARP Tech Ltd | Bradford | 2025 |
| Arp-Uk Limited | Altrincham | 2021 |
| Arpan Productions Limited | Horley | 2024 |
| Arpc Software Limited | Callander | 2021 |
| Arpchord Ltd | Dagenham | 2008 |
| Arpeggio Pictures Limited | Edinburgh | 2022 |
| Arpeggio Publishing Ltd | Oxon | 2018 |
| Arpixia Ltd | London | 2026 |
| Arplatia KMA Limited | Harrow | 2013 |
| Arpo Ltd | Morden | 2022 |
| Arppa Technologies UK Ltd | Stratford-Upon-Avon | 2024 |
| Arpu Ltd | London | 2023 |
| Arpx Ltd | Rickmansworth | 2025 |
| Arpx Space Ltd | Aberdeen | 2025 |
| ARQ Insights Ltd | Leeds | 2025 |
| ARQ IT Consultancy PVT Ltd | Surbiton | 2016 |
| ARQ Labs Ltd | Friern Barnet | 2024 |
| ARQ Software Ltd | Doncaster | 2026 |
| ARQ Studios Ltd | London | 2024 |
| Arqa Partners Ltd | Harrogate | 2024 |
| ARQA51 Ltd | Watford | 2015 |
| Arqanex Ltd | London | 2025 |
| Arqara Ltd | London | 2026 |
| Arqelon Ltd | London | 2025 |
| Arqenta Ltd | London | 2026 |
| Arqentra Limited | Cardiff | 2026 |
| Arqera Limited | London | 2026 |
| Arqestra Ltd | London | 2025 |
| Arqeye Ltd | Tunbridge Wells | 2025 |
| Arqino Digital Limited | London | 2016 |
| Arqion Group Ltd | London | 2026 |
| Arqis Health Ltd | London | 2005 |
| Arqit Limited | London | 2017 |
| Arqiva (Scotland) Limited | Edinburgh | 2009 |
| Arqiva Communications Limited | Hampshire | 1994 |
| Arqiva International Holdings Limited | Winchester | 2013 |
| Arqiva Limited | Hampshire | 1990 |
| Arqiva Mobile TV Limited | Winchester | 2000 |
| Arqiva Satellite Limited | Winchester | 1987 |
| Arqiva Smart Financing Limited | Winchester | 2013 |
| Arqiva Smart Holdings Limited | Winchester | 2013 |
| Arqiva Smart Metering Limited | Winchester | 2013 |
| Arqiva Smart Parent Limited | Winchester | 2013 |
| Arqiva Swing Limited | Winchester | 2010 |
| Arqiva Telecoms Investment Limited | Winchester | 1999 |
| Arqive Ltd | London | 2002 |
| Arqivus Ltd | London | 2025 |
| Arqmind Ltd | Hitchin | 2019 |
| Arqore Ltd | Warrington | 2025 |
| Arqtech IT Solutions Limited | Gloucester | 2022 |
| Arqtic Technology Limited | Malmesbury | 2018 |
| Arqubee Limited | Jordans | 2003 |
| Arquette Media Ltd | Hungerford | 2017 |
| Arquevue Ltd | London | 2022 |
| Arquitect Limited | London | 2022 |
| Arqulus Ltd | London | 2026 |
| Arquo Technologies Ltd | Sidcup | 2017 |
| Arqvera Limited | Stratford Upon Avon | 2025 |
| Arqworks Ltd | Witney | 2016 |
| ARR Homes Ltd | Liverpool | 2017 |
| ARR Private Limited | London | 2023 |
| ARR Solutions Ltd | Crewe | 2013 |
| Arra Energy Ltd | London | 2025 |
| Arraad AI Limited | London | 2014 |
| Arracont Consulting Ltd | Falmouth | 2015 |
| Arrae Limited | London | 2025 |
| Arrahman Systems Limited | Croydon | 2023 |
| Arrain Company Group Ltd | Plumtree | 2023 |
| Arraivo Ltd. | Edinburgh | 2026 |
| Arrakis Security Limited | London | 2026 |
| Arrakis Services Ltd | London | 2025 |
| Arrakis Technologies Limited | Bristol | 2025 |
| Arrakkis Limited | Glasgow | 2020 |
| Arram Business Solutions Ltd | Hatfield | 2018 |
| Arramton Infotech Limited | Mitcham | 2024 |
| Arran Graphics & Computers Limited | Glasgow | 1996 |
| Arran Heaton Productions Ltd | London | 2019 |
| Arran Intelligence Ltd | Bristol | 2026 |
| Arran IT Consultancy Ltd | Tring | 2023 |
| Arran IT Limited | Chelmsford | 2022 |
| Arran Kenny Ltd | London | 2023 |
| Arran Logic Ltd | Edinburgh | 2026 |
| Arran Rice Media Limited | London | 2018 |
| Arrana Ltd | Leicester | 2014 |
| Arrana Trading Ltd | Leicester | 2007 |
| Arrancorp Ltd | London | 2025 |
| Arranet Ltd | Bristol | 2013 |
| Arrantech Ltd | Glasgow | 2018 |
| Arrantek Limited | Chelmsford | 2016 |
| Arratech Solutions Ltd | Warrington | 2019 |
| Array 17 Limited | Littleborough | 2024 |
| Array Consulting Limited | London | 2013 |
| Array Digital Ltd | Poulton-Le-Fylde | 2023 |
| Array Ediscovery (UK) Limited | Harrow | 2009 |
| Array IT Ltd | London | 2018 |
| Array Labs Innovations Limited | London | 2023 |
| Array Ltd | Manchester | 2019 |
| Array Media Production Ltd | Redditch | 2022 |
| Array Minds Limited | South Croydon | 2022 |
| Array of Bytes Limited | Sheffield | 2015 |