| Aushi Ltd | Edgware | 2012 |
| Ausman Modular Structures Ltd | Wisbech | 2022 |
| Ausonica Limited | London | 2019 |
| Auspex Ventures Ltd | Downham Market | 2012 |
| Auspey Trading Limited | Ballynahinch | 2017 |
| Auspi UK Limited | Bridgend | 2017 |
| Auspicious Furniture Ltd | Stroud | 2015 |
| Auspicious Marinserv Co., Ltd | Gillingham | 2022 |
| Aussie Crunchups Ltd | Bolton | 2025 |
| Aust Fabrications & Welding Services Ltd | Bristol | 2020 |
| Austar UK Limited | Huddersfield | 2020 |
| Austco Marketing & Service (UK) Limited | Bromsgrove | 2000 |
| Austcornish Adventures Limited | Cornwall | 2006 |
| Austec Fleet Solutions Limited | Liphook | 2024 |
| Austeez Ladekz Limited | London | 2024 |
| Austella Ltd | Wokingham | 2014 |
| Austen Fabrication Limited | Witney | 2012 |
| Austen Meek Ltd | Wetherby | 2015 |
| Austen Services Ltd | Angmering | 2015 |
| Austhall Holdings Limited | Lancashire | 2003 |
| Austhorpe Signs Ltd | Pontefract | 2007 |
| Austin Auto Body Work Limited | Nottingham | 2019 |
| Austin Cars Ltd | Salisbury | 2023 |
| Austin Communications Ltd | Cheltenham | 2006 |
| Austin Creations Ltd | London | 2022 |
| Austin Design and Build Limited | Macclesfield | 2022 |
| Austin Electric Ltd | Rayne | 2019 |
| Austin Engineering (Shropshire) Ltd | Crew Green | 2000 |
| Austin Fabrications Limited | Suffolk. | 1990 |
| Austin Handling Ltd | Suffolk | 1985 |
| Austin Hayes Limited | Leeds | 1990 |
| Austin Healey Motor Company Limited | Buxhall | 2025 |
| Austin Lifts Limited | Jesmond | 1998 |
| Austin Mcneil Ltd | London | 2020 |
| Austin Motor Company Ltd | Stowmarket | 2015 |
| Austin Reproduction Parts Limited | Poole | 2006 |
| Austin Research & Development Limited | Rayne | 2020 |
| Austin United Ltd | Birmingham | 2017 |
| Austin Walmsley Ltd | Preston | 2002 |
| Austin, Wolstencroft & Co. Limited | Oldham | 1954 |
| Austin-Mg-Sport Limited | Abingdon | 2021 |
| Austinracing Limited | Lewes | 2015 |
| Austinsible Ltd | Coventry | 2022 |
| Austintatious Ateliers Limited | London | 2024 |
| Austintatious Limited | Potters Bar | 2017 |
| Austops Limited | Knottingley | 2015 |
| Australian Bodycare Limited | London | 2021 |
| Australian Health Vitality (UK) Limited | London | 2021 |
| Australian Marine Life Group Ltd | Beckenham | 2021 |
| Austringer Cider Ltd | Port Talbot | 2022 |
| Autac Products Limited | Macclesfield | 1964 |
| Autajon Labels Royston England Limited | Royston | 1995 |
| Autalogic Engineering Ltd | Bradford | 2018 |
| Autarky Automation Limited | West Sussex | 1972 |
| Autarky Group Limited | West Sussex | 1997 |
| Autem Vacuum Lifters Ltd | Fenwick | 2019 |
| Auteri Jewellers Ltd | London | 2015 |
| Authentic Attribute Limited | London | 2019 |
| Authentic Bespoke Limited | Newton Abbot | 2017 |
| Authentic Bite Limited | Wolverhampton | 2013 |
| Authentic Brew Limited | Brighton | 2024 |
| Authentic Hub Ltd | Wolverhampton | 2025 |
| Authentic Island Foods Ltd | Southend-On-Sea | 2016 |
| Authentic Media Limited | Leighton Buzzard | 2009 |
| Authentic Nigerian MIX Ltd | Milton Keynes | 2024 |
| Authentic Realms Ltd | Cheadle | 2023 |
| Authentic Snack Co Ltd | London | 2019 |
| Authentic Sourcing Knowledge Limited | London | 2004 |
| Authentic Sweets Ltd | Manchester | 2018 |
| Authentic Timber Windows Ltd | Ashford | 2006 |
| Authentic Wood Floors Ltd | Cirencester | 2023 |
| Authentic World Foods Limited | Aberdare | 2015 |
| Authenticbrandbag Ltd | Cardiff | 2025 |
| Authenticus Ltd | Crawley | 2018 |
| Authentigait Ltd | Sandown | 2017 |
| Authentik Aroma Ltd | Glasgow | 2026 |
| Authentikit Limited | Broughton-In-Furness | 2022 |
| Authentique Skin Labs Ltd | London | 2026 |
| Authorised Limited | Cardiff | 2019 |
| Authorised Publications Media Ltd | Borehamwood | 2019 |
| Authorised Turbine Technicians Ltd | Barrow-In-Furness | 2022 |
| Autic Designs Ltd | London | 2026 |
| Autins Limited | Rugby | 1966 |
| Auto & Marine Composites Ltd | Gateshead | 2011 |
| Auto 24 Limited | London | 2017 |
| Auto Additions Nationwide Limited | Belper | 2016 |
| Auto Bionics Ltd | Selby | 2009 |
| Auto Blitz Ltd | Manchester | 2019 |
| Auto Boats Limited | Cheltenham | 2020 |
| Auto Body PR Limited | Birmingham | 2016 |
| Auto Car Parts UK Ltd | Brentford | 2023 |
| Auto Carmeleon Limited | Lewes | 2015 |
| Auto Classics (Global) Ltd | Crediton | 2024 |
| Auto Control Touchdown Limited | Newton Aycliffe | 2017 |
| Auto Conversions Limited | Bradford | 2020 |
| Auto Cosmetics North East Limited | Tyne & Wear | 2007 |
| Auto Craft Engineering UK Limited | Norwich | 2004 |
| Auto Custom Performance Limited | Thetford | 2017 |
| Auto Dental Equipment Ltd | Dumfries | 2026 |
| Auto Design Technics Ltd | Bradford | 2020 |