| Aquatics Installation & Maintenance Ltd | Rugby | 2024 |
| Aquatide (Midlands) Limited | Redditch | 1995 |
| Aquatiq Hygiene Systems Ltd | Inverness | 2012 |
| Aquatiq Ltd | Inverness | 2007 |
| Aquatox Health Limited | Dunstable | 2021 |
| Aquatrac (UK) Limited | Wickford | 1992 |
| Aquavalet Limited | Chesham | 2016 |
| Aquavent Limited | Alton | 2002 |
| Aquawash (N.I.) Ltd | Newtownabbey | 2013 |
| Aquawaves Limited | Southampton | 2008 |
| Aqueen Ltd | London | 2023 |
| Aqueion Ltd | London | 2013 |
| Aqueous Beauty Limited | Peterhead | 2012 |
| Aqueous Carpet and Upholstery Cleaning Limited | Bognor Regis | 2016 |
| Aqueous Projects Limited | London | 2016 |
| Aquila Concierge Services Ltd | Hindhead | 2015 |
| Aquila Forte Ltd | London | 2015 |
| Aquila Instruments Limited | Chelmsford | 2000 |
| Aquila International Limited | London | 2025 |
| Aquila Technology Limited | Uxbridge | 2011 |
| Aquila Wildlife & Nature C.I.C. | St. Fillans | 2024 |
| Aquila Worldwide Limited | Manchester | 2025 |
| Aquinas Innovations Limited | Coventry | 2014 |
| Aquinta Consulting Ltd | Chorley | 2014 |
| AR & PR Consultants Ltd | Harrow | 2025 |
| AR 39 Limited | London | 2026 |
| AR Aesthetics & Laser Ltd | London | 2026 |
| AR Art Consulting Ltd. | Harrow | 2013 |
| AR Barbering Ltd | Blyth | 2018 |
| AR Barbers Ltd | Caterham | 2024 |
| AR Beauty & Training Academy by Amina Limited | Oldham | 2025 |
| AR Beauty DUO Ltd | Peterborough | 2025 |
| AR Beauty Ltd | Rotherham | 2018 |
| AR Bespoke Travel Ltd | Banbury | 2026 |
| AR Bloom Luxe Ltd | Preston | 2025 |
| AR Business Supplies Ltd | Ashbourne | 2018 |
| AR Claims Management Limited | Walsall | 2020 |
| AR Concierge Ltd | Doncaster | 2025 |
| AR Construction& Designe Limited | London | 2018 |
| AR Fitness Solutions Ltd | Hove | 2013 |
| AR Forex Cargo Limited | Salford | 2022 |
| AR Global Services Limited | Ilford | 2015 |
| AR Golf Ltd | Maidenhead | 2018 |
| AR Gravitas Ltd | London | 2025 |
| AR Health and Wellbeing Ltd | Chesham | 2024 |
| AR Holistic Fitness Ltd | Birmingham | 2025 |
| AR Holistics Ltd | Hounslow | 2022 |
| AR Hospitality Group Ltd | Glasgow | 2025 |
| AR Incentives Limited | Hatfield | 2025 |
| AR Lash Ltd | Burton-On-Trent | 2025 |
| AR Legal Consultancy Ltd | London | 2025 |
| AR Mobile Care Ltd. | Gloucester | 2019 |
| AR Mobile Hairdressers Limited | Avenue Close | 2015 |
| AR Mobiles & Technology Ltd | Ashby-De-La-Zouch | 2019 |
| AR Organics UK Ltd | Bristol | 2024 |
| AR Phone Warehouse Ltd | London | 2019 |
| AR Plumbing & Bathrooms Ltd | Bristol | 2018 |
| AR Procurement Services Ltd | Wrexham | 2021 |
| AR Rahman Group Limited | Leeds | 2025 |
| AR Regal Beauty Ltd | Liverpool | 2025 |
| AR Salon Nova Ltd | London | 2025 |
| AR Services Yorkshire Ltd | Bradford | 2023 |
| AR Squared 2020 Limited | Pinner | 2020 |
| AR Vascusurgical Ltd | Manchester | 2011 |
| Ar&Sl Limited | London | 2020 |
| Ar-Rahman Education Centre Ltd | Birmingham | 2016 |
| AR024 Limited | Horden Peterlee | 2024 |
| AR2R Limited | London | 2012 |
| ARA - Alternative Rope Access Ltd | Coulsdon | 2017 |
| ARA Aesthetics London Ltd | London | 2024 |
| ARA Aesthetics Ltd | Manchester | 2025 |
| ARA Barbers Ltd | Port Talbot | 2024 |
| ARA Eximium Ltd | Canvey Island | 2014 |
| ARA Invest Ltd | London | 2025 |
| ARA Petsit Ltd | London | 2025 |
| ARA Recovery and Assist Limited | Oldbury | 2025 |
| Ara's of Kensington Ltd | London | 2025 |
| ARA13 Limited | Wakefield | 2024 |
| ARA5H Ltd | Kingswood | 2015 |
| Araana Limited | Droitwich | 2019 |
| Arab Bankers Association | London | 1984 |
| Arab Horse Society(The) | Hungerford | 1968 |
| Arab International United Ltd | Manchester | 2022 |
| Arab International Women's Forum | London | 2001 |
| Arab Investment Development Authority Ltd | Gravesend | 2018 |
| Arab Puppet Theatre Foundation | London | 2019 |
| Arab Revolution Front Ltd | London | 2024 |
| Arab Scientific Community Organisation | Ilford | 2009 |
| Arab Society for Paediatric Endocrinology and Diabetes | Bury St. Edmunds | 2026 |
| Arab Solutions Ltd | Nottingham | 2023 |
| Arab World Ministries | Witney | 1996 |
| Araba Consulting Limited | Brentwood | 2026 |
| Arabasicads Ltd | London | 2023 |
| Arabaswanzy Ltd | Rugby | 2023 |
| Arabella Beau Ltd | Kettering | 2022 |
| Arabella Hair and Beauty Ltd | Ilford | 2018 |
| Arabella Hair Ltd | Bromborough | 2017 |
| Arabella Rose Hair Ltd | Amersham | 2024 |
| Arabellas Hair and Beauty Ltd | Bournemouth | 2022 |
| Arabellas Logistics Limited | Reigate | 2017 |