| Ardmaleish Boatbuilding Company Limited (the) | Isle Of Bute | 1975 |
| Ardmaleish Holdings Limited | Isle Of Bute | 2013 |
| Ardmel Automation Limited | Glenrothes | 1980 |
| Ardmel Precision Engineering Limited | Glenrothes | 2015 |
| Ardmore (Co.Derry) Pre-Cast Concrete Limited | Co Londonderry | 1976 |
| Ardmore Equine Nutrition (UK) Limited | London | 2017 |
| Ardmore Products Limited | Rugby | 2010 |
| Ardmore Spring Water Limited | | 2005 |
| Ardmore Stone Company Ltd | Maghera | 2016 |
| Ardnahoe Distillery Company Limited | Glasgow | 2015 |
| Ardnamurchan Holdings Limited | Ballymena | 2019 |
| Ardnt Productions Ltd | Kilmarnock | 2022 |
| Ardo Medical Limited | Taunton | 2005 |
| Ardo UK Limited | Kent | 1970 |
| Ardorvis Technology Limited | Witney | 2008 |
| Ardour Jewellers Ltd | Leyton | 2026 |
| Ardovie Limited | Kirriemuir | 2023 |
| Ardreagh Catering Ltd | Coleraine | 2026 |
| Ardross Autos Ltd | Letchworth Garden City | 2013 |
| Ardross Castle Water Company Ltd | Alness | 2019 |
| Ardrossan Printing Co. Ltd. | Ardrossan | 2012 |
| Ards Brewing Company Ltd | Newtownards | 2011 |
| Ardshealach Fine Foods Ltd | Lochailort | 2009 |
| Ardtully Limited | Eastleigh | 2014 |
| Ardwin Technologies Ltd | Ballyclare | 2023 |
| Ardza Ltd | Newtownards | 2021 |
| ARE KAY Aviation Ltd | Ayr | 2026 |
| Area Design Limited | Worksop | 2015 |
| Area Four Industries (UK) Ltd | Wisbech | 2001 |
| Area Heat Team Ltd | Bradford | 2018 |
| Area M Custom Engineering Ltd | Weston-Super-Mare | 2009 |
| Area Nostalgia Ltd | Colne | 2025 |
| Area Refrigeration Services Limited | Bognor Regis | 2015 |
| Area Rugs and Carpets Limited | West Yorkshire | 2002 |
| Area Welding Services Ltd | Winsford | 2010 |
| AREA36 Fabrications Ltd | Fareham | 2022 |
| AREA63 Ltd | Rotherham | 2026 |
| Arebian World Trading Limited | London | 2026 |
| Areca Service Ltd | Stoke-On-Trent | 2015 |
| Areeb Arshad Ltd | Southall | 2022 |
| Areej London Limited | Walsall | 2023 |
| Areezy Collections Ltd | Bradford | 2026 |
| Arefay North Ltd | Glasgow | 2014 |
| Arefix Limited | Slough | 2021 |
| Areka Nutrition Ltd | Mildenhall | 2024 |
| Arel Lighting Ltd | Kingston Upon Thames | 2024 |
| Arella Creations Limited | Hengoed | 2007 |
| Arelza Ltd | London | 2025 |
| Arembe Limited | Maidenhead | 2001 |
| Aremco Limited | Wigton | 2004 |
| Arena Health Ltd | Ashford | 2019 |
| Arena Printing Limited | Sutton Coldfield | 2024 |
| Arena Protective Coatings Limited | Bury | 2000 |
| Arena Scarves Limited | Leicester | 2012 |
| Arena Screen & Design Ltd | Buckfastleigh | 2011 |
| Arena Stadia Seating Limited | Barnsley | 2001 |
| Arena Supplies Limited | Pontyclun | 1992 |
| Arena Transfers Ltd | Coventry | 2010 |
| Arena Windows (Upvc) Ltd | Birkenhead | 2015 |
| Arenaxess Ltd | Derby | 2020 |
| Arenval Ltd | Haverhill | 2020 |
| Arepera Conuco Ltd | London | 2021 |
| Areretta's Limited | Croydon | 2017 |
| Ares and Irene Ltd | London | 2025 |
| Ares Apollo Ltd | Manchester | 2016 |
| Ares Plates Ltd | Luton | 2025 |
| Ares Sneakers Ltd | Woking | 2024 |
| Ares Systems Ltd | Luton | 2025 |
| Ares-Recon Ltd | Port Glasgow | 2019 |
| Aresa Foods Company Ltd | London | 2024 |
| Arestor Limited | Leigh-On-Sea | 2016 |
| Aresu & Lambert-Gorwyn Ltd | Penryn | 2025 |
| Arete Climbing Ltd | Totnes | 2020 |
| Arete Made Ltd | Baraham,Canterbury | 2026 |
| Arete Medical Ltd | London | 2021 |
| Arete Medical Technologies Ltd | Cambridge | 2017 |
| Areton Limited | Nottingham | 2015 |
| Arevat&D Co., Ltd | Cambridge | 2020 |
| Arewa Home of Fashion Ltd | Manchester | 2025 |
| Arewa's Label Limited | Clydebank | 2026 |
| Arezoo Bazoft Ltd | London | 2025 |
| Arezz Ltd | Cardiff | 2025 |
| Arezzo Verde Limited | Lisburn | 2023 |
| ARF Imperium Limited | Hull | 2024 |
| ARF Marine Ltd | Millport | 2019 |
| ARF Prefabrication Ltd | Hull | 2022 |
| Arfon Ironworks Limited | Blackwood | 2011 |
| Arfon Rewinds Limited | Gwynedd | 2000 |
| ARG Biomass Ltd | Waltham Abbey | 2013 |
| ARG Builders Ltd | Kingston-Upon-Thames | 2024 |
| ARG Coatings Ltd | Darlington | 2023 |
| ARG Security Limited | Birmingham | 1999 |
| ARG Solutions Ltd | Haywards Heath | 2025 |
| Argan Liquid Gold Limited | Manchester | 2014 |
| Argan of Eden Ltd | Greenford | 2020 |
| Argand Solutions Limited | Totnes | 2012 |
| Argas Ltd. | London | 2022 |
| Argates Ltd | Leicester | 2015 |
| Argent and Sable Limited | Edinburgh | 2021 |
| Argent Energy (UK) Limited | Motherwell | 2001 |