| Array Systems Ltd | London | 2021 |
| Array Technology and Distribution Limited | Chester | 2002 |
| Array Telecom Limited | London | 2021 |
| Array.Ai Limited | London | 2025 |
| Arrayent UK Ltd | London | 2014 |
| Arraypress Limited | Stirling | 2021 |
| Arraysoft Ltd | Welwyn | 2021 |
| Arraysolution Limited | Sheffield | 2023 |
| Arraystream Technologies Limited | London | 2018 |
| Arrazzaq Consultancy Limited | Lincoln | 2014 |
| Arrc IT Solutions Limited | Telford | 2022 |
| Arrc Studio Limited | Bedford | 2025 |
| Arrebol Media Ltd. | Chester Le Street | 2023 |
| Arreoblue Ltd | London | 2022 |
| Arrested Industries Ltd. | London | 2018 |
| Arrested Records Limited | Droitwich | 2011 |
| Arresto Momentum Ltd | London | 2017 |
| Arreteq UK Ltd | London | 2025 |
| Arreviews Ltd | Huddersfield | 2026 |
| Arrex Consulting Limited | Cardiff | 2014 |
| Arrey Consultants Ltd | Walsall | 2015 |
| Arria DATA2TEXT Limited | Aberdeen | 2009 |
| Arria NLG (UK) Limited | London | 2011 |
| Arribacom Limited | Manningtree | 2012 |
| Arribada Initiative C.I.C. | Portsmouth | 2018 |
| Arribatec UK Ltd | Leicester | 1995 |
| Arries Services Ltd | Bolton | 2020 |
| Arriga CRM Limited | Leamington Spa | 2016 |
| Arrimo Ltd | Welwyn Garden City | 2023 |
| Arrindia Holdings Limited | London | 2021 |
| Arris Global Ltd. | London | 1982 |
| Arris International Limited | London | 2015 |
| Arris Media UK Limited | London | 2009 |
| Arrisesca Ltd | Plymouth | 2022 |
| Arriv Ltd | Preston | 2026 |
| Arriva Digital Limited | Gloucester | 2019 |
| Arriva Technology Limited | Gloucester | 2018 |
| Arrival Design Limited | Hull | 2005 |
| Arrival IT Ltd | St. Albans | 2011 |
| Arrival Labs Ltd | Poole | 2023 |
| Arrival Platforms Ltd | London | 2025 |
| Arrival Studio Ltd | London | 2026 |
| Arrival Systems Ltd | Crawley | 2026 |
| Arrive Create Ltd | London | 2023 |
| Arrive Technologies Limited | London | 2022 |
| Arrive Wellness Ltd | Rugby | 2025 |
| Arrive Without Travelling Limited | Wilmslow | 2021 |
| Arriveby Limited | Warwick | 2022 |
| Arriveconnected Ltd | Runcorn | 2023 |
| Arrived London Ltd | London | 2022 |
| Arrived Today Ltd | London | 2026 |
| Arrivedat Limited | London | 2010 |
| Arrivesafe Ltd | Liverpool | 2025 |
| Arrivist IT Solutions Limited | Bury St. Edmunds | 2011 |
| Arrivli Ltd | Purley | 2026 |
| Arrivolink Limited | London | 2026 |
| Arrk Consulting Ltd | Harrow | 2006 |
| Arrk Limited | Manchester | 1998 |
| Arrk Media Limited | Manchester | 2017 |
| ARRK360 Ltd | London | 2015 |
| Arro AI Ltd | London | 2026 |
| Arrocms Ltd | Newcastle Upon Tyne | 2018 |
| Arrogant Pixel Ltd | Hampton | 2015 |
| Arrogate Ltd | London | 2017 |
| Arroket Intelligence Ltd. | London | 2026 |
| Arrokoth Design Ltd | Preston | 2022 |
| Arron Crascall Limited | Dover | 2015 |
| Arrontec Ltd | Irvine | 2022 |
| Arroow Productions Ltd. | London | 2018 |
| Arrosys Limited | Wisbech | 2002 |
| Arroteq Ltd | Leeds | 2022 |
| Arrow and Alne Ltd | Stratford-Upon-Avon | 2022 |
| Arrow Associates UK Limited | East Grinstead | 2006 |
| Arrow BC Ltd | Poole | 2026 |
| Arrow Business Communications (Scotland) Limited | Glasgow | 2011 |
| Arrow Business Communications Limited | Liverpool | 2005 |
| Arrow Car,Van and Truck Rental Limited | | 1985 |
| Arrow Catcher Films Ltd | Clogher | 2022 |
| Arrow Comms Ltd | Newcastle Upon Tyne | 2016 |
| Arrow Converged Solutions Limited | Ashford | 2015 |
| Arrow CRM Limited | Coventry | 2025 |
| Arrow Digital Global Limited | London | 2026 |
| Arrow Digital Space Ltd | London | 2020 |
| Arrow Enterprise Computing Solutions Limited | Harrogate | 2000 |
| Arrow Film Distributors Limited | Altrincham | 1991 |
| Arrow Films 1 Limited | London | 2022 |
| Arrow FM Limited | Hassocks | 1996 |
| Arrow Gate Publishing Ltd | London | 2013 |
| Arrow Innovation Services Limited | Manchester | 2020 |
| Arrow International Distribution Limited | London | 2011 |
| Arrow IT Solutions Limited | Birmingham | 2009 |
| Arrow PC Network Limited | London | 2023 |
| Arrow Publishing Limited | Stratford-Upon-Avon | 2002 |
| Arrow Safety Limited | Middx | 1979 |
| Arrow Software Development Limited | Bradford On Avon | 2012 |
| Arrow Tech Solutions Ltd | Nottingham | 2022 |
| Arrow UK Ventures Ltd | London | 2020 |
| Arrow Web Solutions Ltd. | Carlisle | 2011 |
| Arroware Ltd | Oxford | 2021 |
| Arrowdawn Limited | Aberdeen | 2000 |