| Ausfelia Limited | Ashford | 2025 |
| Aushaleyan Limited | Birmingham | 2024 |
| Ausmats Consultancy Limited | Billingham | 2013 |
| Ausmatt Limited | Leeds | 2018 |
| Ausoka Care Ltd | London | 2024 |
| Auspec UK Ltd | Manchester | 2010 |
| Aussia Ltd | London | 2022 |
| Aussiedental Ltd | Shrewsbury | 2021 |
| Austec Medical Services Ltd | Harlow | 2023 |
| Austen Aesthetics Ltd. | Stanford-Le-Hope | 2024 |
| Austen Allen Healthcare Limited | Dartford | 2008 |
| Austen Therapies Limited | Watford | 2017 |
| Austere and Event Medical Solutions Limited | Liverpool | 2024 |
| Austere Environment Solutions Ltd | Cullompton | 2025 |
| Austere Medical Services Ltd | Bo'Ness | 2023 |
| Austere Medical Solutions Ltd | Kenilworth | 2018 |
| Austin Aesthetics Ltd | Goole | 2022 |
| Austin Akas Ltd | Manchester | 2014 |
| Austin BEN Ltd. | Newcastle | 2013 |
| Austin Cardiology Services Ltd | Middlesbrough | 2020 |
| Austin Care Ltd | Chatham | 2025 |
| Austin Care Services Ltd | Sutton | 2019 |
| Austin D'Arcy Care Services Ltd | Barnet | 2020 |
| Austin Resources Care Services Limited | Leicester | 2023 |
| Austin Resources Limited | Leicester | 2010 |
| Austin Trauma Services Ltd | Nottingham | 2023 |
| Austin Ugwumadu & Associates Limited | New Eltham | 2021 |
| Austin& White Support Group Limited | Bournemouth | 2025 |
| Austin.P Limited | Wrexham | 2020 |
| Austindent Limited | Cardiff | 2022 |
| Austine Limited | Luton | 2025 |
| Austingracesuk Limited | Loughton | 2006 |
| Austinjoy Limited | London | 2015 |
| Austlid Comaservice Ltd | Pencoed, Bridgend | 2006 |
| Australian Skin Clinics Limited | Chard | 2015 |
| Autangel Community Interest Company | Reading | 2013 |
| Autarkeia Care Services Ltd | Gloucester | 2023 |
| Autentive Community Interest Company | Margate | 2024 |
| Authentic Care Ltd | Colchester | 2018 |
| Authentic Care Services Limited | Doncaster | 2006 |
| Authentic Connection Therapy Ltd | Liverpool | 2025 |
| Authentic Global Ltd | Lincoln | 2025 |
| Authentic Goddess Life Coach Ltd | Manchester | 2023 |
| Authentic Health Care Limited | Reading | 2017 |
| Authentic Health Ltd | Glasgow | 2024 |
| Authentic Healthcare Services Ltd | Leeds | 2018 |
| Authentic Kare Company Limited | Leicester | 2014 |
| Authentic Psychology Services Ltd. | Aberdeen | 2023 |
| Authentic Self Counselling Services Limited | Exeter | 2022 |
| Authentic Shilajit Ltd | Newcastle Upon Tyne | 2023 |
| Authentic Thai Massage Lounge Limited | Kidderminster | 2024 |
| Authentic Therapy & Training Limited | Aylesbury | 2023 |
| Authentic Voice Ltd | London | 2022 |
| Authentically ME Ltd | York | 2020 |
| Authentically US CIC | Norton | 2026 |
| Authentically YOU Ltd | Poulton-Le-Fylde | 2022 |
| Authenticallyou Ltd | Bury St. Edmunds | 2021 |
| Authentik Ltd | London | 2015 |
| Authentik Wellness Ltd | London | 2021 |
| Authentism Ltd | Belfast | 2026 |
| Authorising Engineer Limited | Stoke On Trent | 2018 |
| Authum Care Limited | Hitchin | 2020 |
| Autimly Limited | London | 2025 |
| Autism & Adhd Services North West CIC | Liverpool | 2025 |
| Autism & Aspergers Care Services Ltd | Brighton | 2010 |
| Autism & Aspergers Support Ltd | Brighton | 2010 |
| Autism ABA Ltd | Maidstone | 2020 |
| Autism Alphabet Limited | Bath | 2021 |
| Autism and Adhd Diagnostic Centre Limited | Glasgow | 2020 |
| Autism and Neurodiversity North Scotland Limited | | 1998 |
| Autism Angels Ltd | Harrogate | 2012 |
| Autism Assessment and Advocacy Ltd | Pinner | 2026 |
| Autism Assessment West Ltd | Enniskillen | 2026 |
| Autism Assessments Farnham Ltd | Farnham | 2023 |
| Autism Assessors Ltd | Solihull | 2021 |
| Autism at Kingwood | Didcot | 1994 |
| Autism Awareness Through Sport C.I.C. | Kington | 2024 |
| Autism Bedfordshire | Bedford | 2003 |
| Autism Behaviour Consultancy Ltd | Skipton | 2023 |
| Autism Bricks UK CIC | Leeds | 2016 |
| Autism Care (Bedford) Limited | Warrington | 2013 |
| Autism Care (North West) Limited | Warrington | 2001 |
| Autism Care (UK) Limited | Warrington | 2000 |
| Autism Care Services UK Ltd | Ballinamallard | 2026 |
| Autism Care UK (2) Limited | Warrington | 2010 |
| Autism Care UK (3) Limited | Warrington | 2011 |
| Autism Care UK (4) Limited | Warrington | 2011 |
| Autism Centred Care Limited | Bedford | 2022 |
| Autism Circle of Support Ltd | London | 2022 |
| Autism Clinic London Limited | London | 2019 |
| Autism Community Network C.I.C. | Bristol | 2011 |
| Autism Consultancy & Training (ACT) Limited | Belfast | 2008 |
| Autism Consultancy Services Limited | Bromley | 2014 |
| Autism Detect Ltd | Hinckley | 2024 |
| Autism Diagnosis UK Limited | Spalding | 2023 |
| Autism Diagnostics Healthcare Ltd | Doncaster | 2024 |
| Autism Diagnostics Ltd | London | 2025 |
| Autism Family Dynamics Limited | Telford | 2024 |
| Autism Foundation C.I.C. | Sale | 2024 |
| Autism Gifted Hands Limited | Erith | 2019 |