| Aspire Therapy Services Limited | High Peak | 2013 |
| Aspire to Inspire Hull Ltd | Hull | 2025 |
| Aspire to Rise CIC | London | 2026 |
| Aspire Together CIC | Stowmarket | 2011 |
| Aspire UK Care Services Ltd | Bradford | 2023 |
| Aspire Ultrasound Consultancy Services Limited | Wrexham | 2017 |
| Aspire Wellbeing Centre Community Interest Company | Stanmore | 2012 |
| Aspire Wellbeing Services Limited | Blackpool | 2025 |
| Aspire Wellness Limited | Eastbourne | 2024 |
| Aspire Young Persons Connect Limited | Newcastle Upon Tyne | 2017 |
| ASPIRE2EVOLVE UK Ltd | Doncaster | 2026 |
| Aspire@Rossholme Ltd | Highbridge | 2021 |
| Aspired Assistance Limited | Holland-On-Sea | 2017 |
| Aspired Care Ltd | Camberley | 2024 |
| Aspirem Healthcare Limited | Altrincham | 2011 |
| Aspireone Care Limited | Stoke On Trent | 2011 |
| Aspirer Ltd | Blackpool | 2022 |
| Aspires Limited | Kings Lynn | 1996 |
| Aspiresevens Services Ltd | West Drayton | 2025 |
| Aspiring Communities | Leeds | 2010 |
| Aspiring Communities Sheffield Limited | Sheffield | 2013 |
| Aspiring Enterprises Ltd | York | 2013 |
| Aspiring Lives Ltd | Ellesmere Port | 2018 |
| Aspiring Minds Psychology Limited | Leyland | 2017 |
| Aspiring Steps Ltd | Tipton | 2024 |
| Asplands Medical Ltd | Woburn Sands | 2022 |
| Aspray House Ltd | Poole | 2003 |
| Asprey Healthcare Limited | London | 2013 |
| Aspris (Arden) Limited | Leicester | 2015 |
| Aspris Care North West Limited | Leicester | 2003 |
| Aspro Atlantic Medical Tourism Ltd | London | 2018 |
| Aspro Mavro Limited | Glasgow | 2021 |
| Aspyre Africa | London | 2014 |
| Aspyre Health Care Ltd | Mitcham | 2014 |
| Aspyre Therapy Solutions Ltd | Bury St. Edmunds | 2018 |
| ASQ Clinical Services Ltd | Lincoln | 2026 |
| ASQ Enterprises Ltd | Dewsbury | 2023 |
| ASQ Medical Ltd | Colchester | 2022 |
| Asquire Care Ltd | London | 2021 |
| Asquiths Social Care Services Limited | Leigh-On-Sea | 2012 |
| ASR Associate Limited | Salford | 2023 |
| ASR Dental Care Elland Limited | Selby | 2021 |
| ASR Dental Care Hackenthorpe Limited | Selby | 2021 |
| ASR Dental Care Limited | Selby | 2015 |
| ASR Health Ltd | London | 2020 |
| ASR Healthcare Limited | Cardiff | 2017 |
| ASR Manchester Limited | Cheadle | 2022 |
| ASR Medical Limited | Solihull | 2022 |
| ASR Medicolegal Ltd | Tonbridge | 2026 |
| ASR Optical Limited | Altrincham | 2012 |
| ASR Optical Services Ltd | Oldham | 2017 |
| ASR Practice Holdings Limited | Selby | 2018 |
| ASR Prosthetics Limited | Selby | 2018 |
| ASR UK Medical Limited | London | 2016 |
| ASR1 Limited | Letchworth Garden City | 2021 |
| Asra Care Group Ltd | Hemel Hempstead | 2025 |
| Asra Care Specialist Ltd | Tonbridge | 2024 |
| Asra Mcgregor Ltd | Kilmacolm | 2022 |
| Asra Medical Services Ltd | Leicester | 2023 |
| Asra Park Ltd | London | 2018 |
| Asrad Limited | Edinburgh | 2022 |
| Asran Diagnostics Limited | Manchester | 2024 |
| Asrb Ltd | Woodford Green | 2015 |
| Asriel Limited | Andover | 2011 |
| Asrk Healthcare Ltd | Solihull | 2023 |
| Asrk Limited | Huddersfield | 2012 |
| Asrodrigues Ltd | Leicester | 2023 |
| Asrt Medical Limited | Lutterworth | 2024 |
| Assad&Yousef Limited | Hanwell | 2016 |
| Assadi Healthcare Ltd | London | 2023 |
| Assag Care Limited | Gravesend | 2019 |
| Assam Diagnostic Ltd | Blackpool | 2025 |
| Assam Optical Services Ltd | Carnoustie | 2019 |
| Assams Ltd | Glasgow | 2019 |
| Assanga Limited | Ilford | 2017 |
| Assas Care Limited | London | 2025 |
| Assay Ness Ltd | Inverness | 2023 |
| Assco Care Ltd | Basildon | 2021 |
| Assean Ltd | London | 2023 |
| Asseco Health Ltd | Leeds | 2019 |
| Assembled Healthcare Ltd | London | 2022 |
| Assembly of GOD | Slough | 2025 |
| Asser Neurodiagnostic Ltd | Coventry | 2026 |
| Assertive Health Care Limited | Sheffield | 2021 |
| Assess LJC Ltd | Flint | 2017 |
| Assess Social Care Consultancy Ltd | Wirral | 2026 |
| Assess Your Fire Risks Ltd | Caldicot | 2015 |
| ASSESS2 Ltd | Melton Mowbray | 2025 |
| Assessed Care Ltd | London | 2022 |
| Assessing YOU Limited | London | 2022 |
| Assessment and Intervention Services Limited | Sutton Coldfield | 2022 |
| Assessment and Services Innovation Ltd | Stowmarket | 2017 |
| Assessment and Training SW Consultancy Ltd | Shipley | 2023 |
| Assessment Inc Ltd | Bournemouth | 2013 |
| Assessment Mindfulness Limited | Manchester | 2026 |
| Assessus Limited | Leicester | 2013 |
| Assesswell Social Work Ltd | Pontyclun | 2025 |
| Asset Imaging Ltd. | Hyde | 2019 |
| Assheton Ophthalmology Limited | St. Helens | 2019 |
| Assiatu Limited | Hemel Hempstead | 2019 |