| Aravax Limited | Oxford | 2024 |
| Aravis Business Growth Limited | Huntingdon | 2018 |
| Aravis Group Ltd | Middlesex | 2010 |
| Aravis Leisure Ltd | Splaynes Green | 2022 |
| Aravis Regen Ltd | Romney Marsh | 2025 |
| Aravis UK Ltd | West Wickham | 2022 |
| Arawak Ltd | Guildford | 2010 |
| Arawak Travel Holdings Limited | London | 2005 |
| Arax Law Limited | London | 2023 |
| Arax Properties Limited | London | 2006 |
| Arax Ventures Limited | London | 2014 |
| Araxa FIN Ltd | London | 2024 |
| Araxis Search Ltd | Leeds | 2025 |
| Araxr Ltd | Cambridge | 2022 |
| Aray Architects Ltd | London | 2011 |
| Aray Content Ltd | Ramsgate | 2024 |
| Araya Ltd | Glasgow | 2024 |
| Araybee Limited | Sutton Coldfield | 2007 |
| Araydesign Ltd | Billericay | 2015 |
| Araye Ltd | Bedford | 2023 |
| Araynertraining Limited | Malvern | 2006 |
| Arazim Consulting Ltd | Edinburgh | 2025 |
| ARB (PM) Ltd | Hull | 2019 |
| ARB Accountancy Services Ltd | Driffield | 2022 |
| ARB Architecture Ltd. | Broadway | 2016 |
| ARB Assure Consulting Ltd | Surbiton | 2024 |
| ARB Consultants (Scotland) Limited | Glasgow | 2023 |
| ARB Consulting Associates Ltd | Halifax | 2012 |
| ARB Controls Ltd | Rushden | 2014 |
| ARB Design Ltd | Gloucester | 2022 |
| ARB Development Projects Limited | Portsmouth | 1984 |
| ARB Engineering Services Ltd | Shrewsbury | 2024 |
| ARB Growth Ltd | Greenock | 2019 |
| ARB Landscaping&Garden Maitenance Ltd | Manchester | 2026 |
| ARB Limited | Harrow | 2006 |
| ARB Management Ltd | Carlisle | 2012 |
| ARB Matters Limited | Kenilworth | 2012 |
| ARB Mechanical Engineering Employee Ownership Trustee Limited | Southampton | 2021 |
| ARB Media Ltd | Croydon | 2024 |
| ARB One Ltd | Basingstoke | 2007 |
| ARB Partners Ltd | Watford | 2024 |
| ARB Projects Limited | Ruislip | 2008 |
| ARB Research Ltd | London | 2026 |
| ARB Resources Limited | London | 2017 |
| ARB Rotary Engineering Limited | Portsmouth | 2022 |
| ARB Science Limited | Preston | 2024 |
| ARB Solicitors Ltd | London | 2023 |
| ARB Survey Services Limited | Oswestry | 2013 |
| ARB Three Ltd | Basingstoke | 2007 |
| ARB Wind Limited | Burntisland | 2018 |
| Arba Consultancy (UK) Ltd | Dunmow | 2005 |
| Arba Consultancy Services Ltd | Watford | 2012 |
| Arba Consulting Ltd | London | 2022 |
| Arba Developments Limited | Doncaster | 2014 |
| Arbadvice Consultancy Ltd | Ryde | 2022 |
| Arbalice Limited | Nuneaton | 1954 |
| Arban Group INT Limited | London | 2015 |
| Arbat Capital Advisory Services Ltd | Hastings | 2003 |
| Arbatel Antiques Ltd | Salisbury | 2011 |
| Arbaz Omar Limited | London | 2025 |
| Arbb Ltd | Godalming | 2024 |
| Arbbat Consultancy Ltd | Rotherham | 2026 |
| Arbc Business Consultancy Ltd | Bothwell | 2024 |
| Arbd Awareness Consultancy Ltd | Weston-Super-Mare | 2026 |
| Arbdb Limited | London | 2011 |
| Arbe Limited | Chepstow | 2025 |
| Arbe Telecommunications Ltd | Redditch | 2025 |
| Arbeadie Consultants Limited | Banchory | 2010 |
| Arbed Accountancy Services Limited | London | 2017 |
| Arbee Ltd | Orpington | 2025 |
| Arbeia Accounting & Bookkeeping Limited | South Shields | 2020 |
| Arbeia Business Services Limited | South Shields | 2002 |
| Arbeia Instrumentation Services Ltd | Exeter | 2024 |
| Arbeia Limited | Tyne And Wear | 2002 |
| Arbel (London) Ltd | London | 2021 |
| Arbel Advertising Limited | Tadley | 2024 |
| Arbentin Services Limited | Southampton | 2003 |
| Arbenz Holdings Ltd | Fareham | 2026 |
| Arber Advisory Services Limited | London | 2026 |
| Arber Industrial Engineering Ltd | Stockport | 2023 |
| Arberry Architectural Services Ltd | Doncaster | 2020 |
| Arbery Surveyors Ltd | London | 2023 |
| Arbeth Architects Ltd | Leyburn | 2026 |
| Arbethnot Consulting Ltd | London | 2023 |
| Arbexa Ltd | New Malden | 2016 |
| Arbexcellence Limited | Eastleigh | 2014 |
| Arbgrind Ltd | Brough | 2022 |
| Arbhaus Limited | Watlington | 2000 |
| Arbi Consultancy (UK) Ltd | London | 2023 |
| Arbia Limited | Waterlooville | 2018 |
| Arbiant Limited | London | 2022 |
| Arbicon ADR Limited | Saffron Walden | 2006 |
| Arbikie Distillery Green Hydrogen Limited | Edinburgh | 2022 |
| Arbileo Advisory Ltd | Richmond | 2020 |
| Arbilife Ltd | London | 2025 |
| Arbin Business Solutions Limited | Maidenhead | 2004 |
| Arbin Engineering Limited | Emsworth | 2004 |
| Arbin Mileva Consultancy Ltd | London | 2019 |
| Arbis Consulting Ltd | Colchester | 2022 |
| Arbitect Limited | Redditch | 2022 |