| Authentic Alps Ltd | Ballymena | 2005 |
| Authentic Barber Shop Limited | Leicester | 2025 |
| Authentic Brands Limited | Old Harlow | 1995 |
| Authentic Business Associates Ltd | Reading | 2024 |
| Authentic Evolution Ltd | Shrewsbury | 2015 |
| Authentic Fashion Designers Ltd | Salford | 2015 |
| Authentic Locks Ltd | Leeds | 2014 |
| Authentic New Apostolate Church Ltd | Grays | 2023 |
| Authentic New Apostolate Church UK & Ireland Ltd | Grays | 2026 |
| Authentic Outdoors Limited | Belper | 2021 |
| Authentic Pilates Ltd | London | 2021 |
| Authentic Sauna Experiences Limited | Manchester | 2024 |
| Authentic Skin Ltd | Sunbury-On-Thames | 2025 |
| Authentic Solutions Limited | London | 2012 |
| Authentic Thai Massage & Spa Limited | Cardiff | 2024 |
| Authentic Thai Massage Limited | Poole | 2020 |
| Authentic Things Limited | Banbury | 2011 |
| Authentic Wine Limited | Berkhamsted | 2020 |
| Authentic Workingham Ltd | London | 2024 |
| Authentic YOU NOW Ltd | Ruislip | 2011 |
| Authentica Limited | Guildford | 2013 |
| Authentica Notaries Ltd | London | 2018 |
| Authentically YOU Aesthetics Ltd | Leamington Spa | 2026 |
| Authenticate Certify Grade Limited | Sheffield | 2025 |
| Authology Ltd | Manchester | 2022 |
| Author Interiors Limited | Dundee | 2015 |
| Author's Edition Ltd | St. Neots | 2021 |
| Authors Aloud UK Limited | St. Albans | 2015 |
| Authors' Licensing and Collecting Society Limited | London | 1977 |
| Autiboi Apparel Limited | Towcester | 2023 |
| Autier Ltd | London | 2018 |
| Autinest Ltd | Kington | 2025 |
| Autism Ally Ltd | Cardiff | 2023 |
| Autism Bristol Ltd | Tenby | 2013 |
| Autism Care Everywhere Ltd | Altrincham | 2016 |
| Autism Central England Limited | Worksop | 2014 |
| Autism South East C.I.C. | Gravesend | 2019 |
| Autism World CIC | Oldham | 2024 |
| Autism-Independence C.I.C. | Bristol | 2013 |
| Autistic After Hours Community Interest Company | Torquay | 2023 |
| Autistic Flair CIC | Aberdeen | 2022 |
| Autistic UK CIC | Caernarfon, | 2019 |
| Auto & Home Lock Pros Ltd | Bristol | 2024 |
| Auto Accident Assistance Ltd | Gravesend | 2023 |
| Auto Agile Ltd | London | 2025 |
| Auto AS Limited | Pinchbeck - Spalding | 2012 |
| Auto Assist (N.E) Ltd | Ilkley | 2019 |
| Auto Car Wash Limited | London | 2024 |
| Auto Classica Storage Limited | Milton Keynes | 2017 |
| Auto Clean Hand Car Wash Limited | Carlisle | 2023 |
| Auto Clean Valeting Frizington Ltd | Frizington, Cumbria, | 2025 |
| Auto Connexon Limited | Blackburn | 2024 |
| Auto Damage UK Ltd | Romford | 2024 |
| Auto Diagnostics and Locksmith Ltd | Nottingham | 2024 |
| Auto Direct MOT Ltd | Manchester | 2013 |
| Auto Door Control Ltd | Barnsley | 2024 |
| Auto Door Repairs Limited | Daventry | 2013 |
| Auto Electronics Repairs Ltd | Oldham | 2025 |
| Auto Fair Limited | London | 2020 |
| Auto Finance Limited | Aberystwyth | 2011 |
| Auto Flash Car Wash Ltd | Loggerheads | 2024 |
| Auto Forum Developments Limited | Eastleigh | 1970 |
| Auto Genie Ltd | Merthyr Tydfil | 2019 |
| Auto House Limited | Croydon | 2017 |
| Auto Investment Trust Limited | London | 1936 |
| Auto Key Assist Stoke Ltd | Stoke-On-Trent | 2025 |
| Auto Key Solution (NW) Limited | Middleton | 2023 |
| Auto Key Specialist Limited | London | 2012 |
| Auto LAB UK Ltd | Blackburn | 2014 |
| Auto Locks 24/7 Ltd | Edinburgh | 2025 |
| Auto Locksmith Liverpool Ltd | Liverpool | 2023 |
| Auto Locksmiths London Limited | Bexhill | 2011 |
| Auto MAN Ltd | Camberley | 2022 |
| Auto Mobile Yard Ltd | Birmingham | 2025 |
| Auto Motive Pumps Holdings Limited | Milton Keynes | 2014 |
| Auto Point Leeds Ltd | Leeds | 2012 |
| Auto Reach Group Ltd | London | 2026 |
| Auto Rescue (Scotland) Ltd. | Airdrie | 2014 |
| Auto Resprays Limited | Leeds | 2013 |
| Auto Safety Centre (North West) Limited | St. Helens | 2009 |
| Auto Service Plan Ltd | London | 2022 |
| Auto Services (Midlands) Limited | Brierley Hill | 2021 |
| Auto Shine (UK) Ltd | Bicester | 2007 |
| Auto Shine Hand Car Wash Ltd | Rowley Regis | 2022 |
| Auto Shine of Ashford Ltd | Ashford | 2018 |
| Auto Shine Solutions Ltd | Manchester | 2024 |
| Auto Shiners Limited | Northwood Hills | 2003 |
| Auto Simplicity Ltd | Bristol | 2020 |
| Auto Software Limited | Dawlish | 2005 |
| Auto Spa Services Limited | Leicester | 2019 |
| Auto Trade Hub Ltd | Chertsey | 2019 |
| Auto Trail Owners Club | Sidmouth | 2003 |
| Auto Valeting Centre Ltd | Margate | 2015 |
| Auto Vehicle Sales Ltd | Liverpool | 2020 |
| Auto-Keys of Shropshire Ltd | Newport | 2024 |
| Auto-Marine Cleaning Services Limited | Churston | 1990 |
| Auto-Spa Ltd | London | 2025 |
| Autoblasters (UK) Limited | Hull | 2006 |
| Autobright Car Valet Limited | Coventry | 2019 |
| Autocar Repairs Limited | London | 2014 |