| Attuned Psychology and Consulting Ltd | Nottingham | 2026 |
| Attwood Academies | Cranbrook | 2014 |
| Attwood Medical Services Limited | Mansfield | 2019 |
| Atypical Community CIC | London | 2025 |
| AU Analysts Limited | Glasgow | 2025 |
| Auberge Education Ltd | Cardiff | 2019 |
| Aucademy CIC | London | 2022 |
| Auchinbee Care Limited | Glasgow | 2015 |
| Auchterarder Creative Arts Academy CIC | Auchterarder, | 2021 |
| Auckland College Holdings Ltd | Liverpool | 2019 |
| Auckland College Ltd | Liverpool | 2010 |
| Auckley Pre-School Limited | Doncaster | 2015 |
| Auckley School | Doncaster | 2011 |
| Auctus Neuro Provision Limited | London | 2026 |
| Auctus PVT Ltd | Rayleigh | 2021 |
| Auda Medical Ltd | Bromley | 2013 |
| Audace Oxbridge Learning Limited | Oxford | 2025 |
| Audacious Revolution Limited | Chester | 2005 |
| Audaz Ltd | Southend-On-Sea | 2026 |
| Audel Tiney Home Nursery Ltd | Harrow | 2025 |
| Auden Education Consultancy Limited | Knowle, Solihull | 2023 |
| Auden Place Community Nursery | London | 1995 |
| Audhd Bites Ltd | London | 2025 |
| Audhd Consulting Ltd | Maidstone | 2025 |
| Audio Rebel Project CIC | Bury St. Edmunds | 2025 |
| Audiopi Limited | Herne Bay | 2015 |
| Audioraspace CIC | London | 2025 |
| Audiotown Music Academy Ltd | London | 2026 |
| Auditing Consultancy & Training Services Ltd | Thetford | 2019 |
| Auditor Training and Certification UK Ltd | London | 2023 |
| Auditorium Parvum Ltd | Oxford | 2024 |
| Audley Educational Consultancy Limited | Basildon | 2014 |
| Audrey Antoine Ltd | London | 2025 |
| AUF Educational Services Ltd | Barking | 2024 |
| Aughnacloy Playgroup Limited | Aughnacloy | 2010 |
| Augment Academy UK Ltd | Ruislip, | 2025 |
| Augment T&E Limited | London | 2021 |
| Augmented People CIC | London | 2025 |
| Augmentible Ltd | Kington | 2025 |
| AUH Driving Ltd | Halesowen | 2026 |
| Aukestra CIC | Durham | 2015 |
| Auld Alliance Cricket Coaching Limited | Prudhoe | 2023 |
| Aunelle (UK) Ltd | Bedford | 2015 |
| Aunt FLO Organisation Ltd | Farnham | 2021 |
| Aunt Minnie Courses Limited | Leeds | 2013 |
| Auntie | Manchester | 2009 |
| Auntie A'S Daycare Limited | Wembley | 2026 |
| Auntie Ann's Day Nursery Ltd | Croydon | 2013 |
| Auntie Jayne's House Limited | Thingwall | 2005 |
| Auntie LEW Childminding Limited | London | 2023 |
| Aunty Jules Ltd | Virginia Water | 2023 |
| Aunty Lou's Limited | London | 2020 |
| Aunty Maris Child Care Limited | London | 2025 |
| Aura Academy Ltd | London | 2024 |
| Aura Education Ltd | Watford | 2014 |
| Aura Elite Limited | Slough | 2025 |
| Aura Music (Wilmslow) Ltd | Urmston | 2022 |
| Aura Music Limited | Urmston | 2016 |
| Aura Support & Education Limited | Cannock | 2024 |
| Aura UP CIC | Birmingham | 2023 |
| Aura Wellbeing Studio CIC | Wolverhampton | 2025 |
| Aura-Soma Education Systems Limited | Tetford | 2002 |
| Aural Ouroboros Limited | Bristol | 2024 |
| Auralern Limited | Borehamwood | 2004 |
| Auralyze.Ai Ltd | Romford | 2023 |
| Aurasol Ltd | Manchester | 2022 |
| Aurea Mediocritas Ltd | Nottingham | 2024 |
| Aurelia Limited | Stowmarket | 1999 |
| Aurelia Training Limited | Coventry | 1999 |
| Aurelius Archaeology Ltd | Newcastle-Under Lyme | 2023 |
| Aurelius Education Ltd | Southall | 2026 |
| AUREM8 Ltd | London | 2026 |
| Aureol Marine Ltd | Fleetwood | 2012 |
| Aureon Cura Ltd | London | 2026 |
| Aureum Academy of Dance Limited | Lampeter | 2025 |
| Aurevia Education Limited | Estover | 2026 |
| Auri Bloom C.I.C. | London | 2026 |
| Aurilm Limited | Walsall | 2026 |
| Aurion Education Ltd | London | 2025 |
| Aurniox Ltd | Cardiff | 2025 |
| Auro Centre for Integral Health Ltd | Hitchin | 2025 |
| Aurora & Koda Ltd | Swansea | 2025 |
| Aurora Academies Trust | Bexhill On Sea | 2012 |
| Aurora Accountancy & Taxation Training Ltd | Middlesex | 2006 |
| Aurora Arts Studio Ltd | Edinburgh | 2025 |
| Aurora ASD Limited | Gloucester | 2016 |
| Aurora Care and Education Holdings Limited | Gloucester | 2015 |
| Aurora Care and Education Midco Limited | Gloucester | 2015 |
| Aurora Care and Education Opco Limited | Gloucester | 2015 |
| Aurora Care Ltd | Milton Keynes | 2025 |
| Aurora Education CC Ltd | Smethwick | 2023 |
| Aurora Education Ltd | Liverpool | 2025 |
| Aurora Education Trust | Bexhill-On-Sea | 2012 |
| Aurora Edventures Ltd | Durham | 2025 |
| Aurora Elite Dance Academy CIC | Salford | 2024 |
| Aurora Family CIC | Reading | 2020 |
| Aurora FE Limited | Gloucester | 2016 |
| Aurora Futures Ltd | London | 2023 |
| Aurora Healing Ltd | Mildenhall | 2003 |
| Aurora Health Consulting Ltd | Stockton-On-Tees | 2011 |