| Althea Smith, Skincare Ltd | Barking | 2022 |
| Althea Women's Health Ltd | Lutterworth | 2024 |
| Althea's Care Limited | London | 2020 |
| Altheo Pathology Ltd | London | 2007 |
| Althorne Reporting Limited | Tidworth | 2019 |
| Althorp Medcare Limited | Luton | 2026 |
| Altime Care Ltd | Carmarthen | 2024 |
| Altimus Footcare Limited | Northolt | 2015 |
| Altine Medical Solutions Limited | Petersfield | 2023 |
| Altitude Healthcare Ltd | Birmingham | 2023 |
| Altitude Medical Limited | Newton Abbot | 2019 |
| Altitude Wellness Clinic Ltd | Pontyclun | 2025 |
| Altius Healthcare Bury Ltd | Altrincham | 2022 |
| Altius Healthcare Ltd | Altrincham | 2015 |
| Altius Healthlink Limited | Harlow, Essex | 2024 |
| Altius Practice Ltd | London | 2026 |
| Altkoin Ltd | Yeovil | 2024 |
| Altmore Dental Ltd | Dungannon | 2023 |
| Altmore Physiotherapy Ltd | Dungannon | 2006 |
| Altmore Practice Limited | London | 2015 |
| Alto SL Ltd | London | 2019 |
| Altogether Care - Care at Home Limited | Weymouth | 2002 |
| Altogether Human CIC | Manchester | 2020 |
| Altogether Mind Body and Soul Limited | Ryde | 2003 |
| Altogether NOW Community Hall CIC | Salford | 2023 |
| Altomax Services Ltd | Northampton | 2019 |
| Alton & James Limited | Sheffield | 2015 |
| Alton Dental Ltd | Edgware | 2014 |
| Alton Manor Limited | Harrow | 2008 |
| Alton Medical Limited | Chesterfield | 2020 |
| Alton Pain Clinic Ltd | Alton | 2020 |
| Alton Primary Care Limited | Portsmouth | 2022 |
| Alton Psychology Ltd | Farnham | 2026 |
| Altonian Care Ltd | Alton | 2013 |
| Altonica Ltd | Liverpool | 2019 |
| Altoo Limited | Grays | 2015 |
| Altri Medical Ltd | Hove | 2023 |
| Altrincham Aerial Arts Ltd | Altrincham | 2025 |
| Altrincham Children's Community Care CIC | Altrincham | 2025 |
| Altrincham Children’S Care Limited | Altrincham | 2025 |
| Altrincham Dent Limited | Altrincham | 2019 |
| Altrincham Healthcare Alliance Primary Care Network Ltd | Altrincham | 2022 |
| Altrincham Physiotherapy and Sports Injury Clinic Limited | Sandbach | 2011 |
| Altrincham Rehabilitation Limited | Altrincham | 2015 |
| Altrincham Ultrasound & Imaging Limited | Altrincham | 2024 |
| Altrix Medispa Limited | Twickenham | 2025 |
| Altrua Care Ltd | Sheffield | 2024 |
| Altruderm Ltd | Glasgow | 2015 |
| Altrudocare Ltd | Feltham | 2025 |
| Altruist Healthcare Ltd | Maidstone | 2023 |
| Altruistic (North Kent) Ltd | Whitstable | 2015 |
| Altruistic Care Limited | London | 1994 |
| Altruva Healthcare Solutions Ltd | Witney | 2025 |
| Altruvita Limited | London | 2023 |
| Alts Medical Limited | Pinner | 2026 |
| Altug Limited | London | 2020 |
| Altum Health Limited | London | 2019 |
| Altum Residential Care Ltd | Nottingham | 2012 |
| Altura Care Solutions Limited | Hornsey | 2025 |
| Altura Chiropractic Clinic Ltd. | Cardiff | 2011 |
| Altura Chiropractic Ltd | Pontypridd | 2011 |
| Altura Medical Limited | Harlow, Essex | 2025 |
| Altwood Care Ltd | London | 2012 |
| ALU Healthcare and Data Ltd | Stockton-On-Tees | 2023 |
| ALU1 Services Limited | London | 2022 |
| Aluk Trading Limited | London | 1989 |
| Alula Aesthetics Ltd | Sale | 2025 |
| Alula Therapy Ltd | London | 2024 |
| Alum Care Limited | Poole | 2004 |
| Alum Limited | Dewsbury | 2021 |
| Alum Limited Company Ltd | Clapton | 2017 |
| Alumee Luxe Ltd | Rochdale | 2025 |
| Alun Evans Orthopaedics Limited | Carmarthen | 2012 |
| Alun Harris Medical Services Ltd | Pontardawe | 2024 |
| Alun Tomkinson Ltd | Cardiff | 2016 |
| Alun Williams Ltd | Edinburgh | 2012 |
| Aluna Echo Ltd | London | 2026 |
| Alunadh Practice Ltd | Taunton | 2025 |
| Alura Life Ltd | Burnley | 2025 |
| Alusi ENT Ltd. | Harrow | 2013 |
| Alusia Ltd | Feltham | 2015 |
| Alutayem Medical Consultancy Ltd | Salisbury | 2022 |
| Alux Ltd. | Southport | 2013 |
| ALV Healthcare Ltd | Chester | 2025 |
| ALV Private Care Ltd | Hamilton | 2023 |
| Alva Medical Ltd | Rotherham | 2022 |
| Alva Play Pals OUT of School Care | Alva | 1995 |
| Alvandy Ltd | Surrey | 2026 |
| Alvaran Care Ltd | Birmingham | 2025 |
| Alvarenga Ltd | Cinderford | 2023 |
| Alvaro Castano Ltd | London | 2018 |
| Alvaroberts Ltd | London | 2017 |
| Alvaroflas Ltd | Hamilton | 2023 |
| Alvaston Achievers Day Nursery Limited | Derby | 2017 |
| Alvearia Ltd | Rochester | 2025 |
| Alveolus Limited | London | 2025 |
| Alveon Limited | Eastbourne | 2026 |
| Alveoplasty Limited | Great Yarmouth | 2018 |
| Alveria Medical Services Ltd | Bolton | 2016 |
| Alverna House Dental Practice Ltd. | Merseyside | 2007 |