| Assure Dental Laboratory Ltd | Epsom | 2024 |
| Assure Dialysis Services Ltd | Birmingham | 2013 |
| Assure Health Group Ltd | Manchester | 2023 |
| Assure Healthcare Group (South) Ltd | Leeds | 2015 |
| Assure Healthcare Group Ltd | Shirley | 2015 |
| Assure Healthcare Ltd | Carryduff | 2024 |
| Assure Holdings Limited | Chepstow | 2015 |
| Assure Living Ltd | London | 2025 |
| Assure ME CIC | Birmingham | 2024 |
| Assure Occupational Therapy Services Ltd | Redhill | 2026 |
| Assure Residential Care Ltd | Leicester | 2020 |
| Assured 24/7 Ltd | Peterborough | 2011 |
| Assured AO Ltd | Wigan | 2022 |
| Assured Assessments Ltd | Stockport | 2024 |
| Assured Care & Support Services Ltd | London | 2024 |
| Assured Care (Stockport) Ltd. | Stockport | 2010 |
| Assured Care 7 Limited | Corby | 2019 |
| Assured Care and Pharmaceuticals Limited | Southend-On-Sea | 2023 |
| Assured Care Living Ltd | Milton Keynes | 2023 |
| Assured Care Ltd | Cardiff | 2017 |
| Assured Care Services Limited | West Sussex | 2003 |
| Assured Clinical Research Ltd | London | 2025 |
| Assured Fertility Limited | Whitefield | 1984 |
| Assured Fostering Limited | Bolton | 2020 |
| Assured H-C Solutions Ltd | Birmingham | 2017 |
| Assured Healthcare (Scotland) Limited | Stirling | 2009 |
| Assured Healthcare and Wellness Services Ltd | London | 2021 |
| Assured Healthcare Solutions Ltd | Tamworth | 2016 |
| Assured Insight Ltd | Rochester | 2023 |
| Assured Life Care Limited | Bexley | 2014 |
| Assured Lifestyle Limited | Sutton Coldfield | 2007 |
| Assured Living Care Limited | South Darenth | 2022 |
| Assured Medical Recruitment Limited | Bedford | 2012 |
| Assured Occupational Health Limited | Aberdeen | 2015 |
| Assured People Support Limited | Wokingham | 2026 |
| Assured Perfusion and Medical Services Limited | Leicester | 2015 |
| Assured Priority Care Limited | Croydon | 2020 |
| Assured Professionals Limited | Nottingham | 2015 |
| Assured Psychological Services Limited | Seaton | 2007 |
| Assured Safety & Health Limited | Matlock | 2014 |
| Assured Social Care Ltd | Hope Valley | 2019 |
| Assured Social Work Ltd | Herne Bay | 2021 |
| Assured Supplements Ltd | Belfast | 2023 |
| Assured Support Ltd | Clitheroe | 2015 |
| Assurereporting Limited | Leeds | 2016 |
| Assut UK Limited | Huddersfield | 2005 |
| AST Coaching Limited | London | 2022 |
| AST Psychotherapy Ltd | Wolverhampton | 2022 |
| Ast-Med Ltd | Barnet | 2019 |
| Asta Strom Limited | Eastbourne | 2008 |
| Astagen Therapeutics Ltd | Sharnbrook | 2008 |
| Astaire Management Ltd | Lichfield | 2020 |
| Astall Pathology Services Limited | Wisbech | 2017 |
| Astanga Yoga London Limited | London | 2003 |
| Astar Care Group Ltd | Liverpool | 2022 |
| Astar Doctors Ltd | Bury St. Edmunds | 2023 |
| Astar Foundation Limited | London | 2017 |
| Astar Homecare Ltd | Colchester | 2017 |
| Astar Homecare Services Limited | Whitchurch | 2017 |
| ASTAR1 Care Agency Limited | Peterborough | 2022 |
| Astarcare Ltd | Harlow | 2019 |
| Astbury & White Limited | Holmfirth | 2018 |
| Astbury Lane Nursery Limited | Salford | 2016 |
| Astek Dental Laboratory Limited | Stamford | 1999 |
| Astelas Ltd | London | 2012 |
| Astella Healthcare Services Ltd | London | 2012 |
| Aster & Iris Limited | London | 2014 |
| Aster 25 Ltd | Blackpool | 2023 |
| Aster Care Solutions Ltd | Plymouth | 2024 |
| Aster House Healthcare Ltd | London | 2018 |
| Aster House West Bromwich Ltd | Burton-On-Trent | 2020 |
| Aster Medical Services Limited | Huddersfield | 2018 |
| Aster Pharm Ltd | Sheffield | 2022 |
| Aster Properties Ltd | Canterbury | 2026 |
| Aster Recruitment Ltd | Northampton | 2024 |
| Aster Support Services Ltd | Barking | 2024 |
| Asteri Services Limited | Windsor | 2021 |
| Asteriks Care Limited | Portsmouth | 2023 |
| Asterion Diagnostics Ltd | Morden | 2014 |
| Asteris Healthcare Ltd | London | 2021 |
| Asterisk Project CIC | Ashford | 2026 |
| Asterlavis Limited | Sunderland | 2024 |
| Asters Specialist Care (Yorkshire) Ltd | Scarborough | 2024 |
| Asteys Management Limited | Cardiff | 2021 |
| Astha Limited | Mansfield | 2003 |
| Asthee Snayu Vikiran Chikitshak Ltd | Leicester | 2024 |
| Asthereal Ltd | Darlington | 2018 |
| Asthetics by Lynsay Gibson Ltd | Leven | 2025 |
| Asthetics Health Ltd | Manchester | 2020 |
| Asthma and Lung UK | London | 1984 |
| Asthma UK | London | 1989 |
| Astia Events Ltd | London | 2019 |
| Astin Services Limited | Bath | 2019 |
| Astley Care Homes Limited | Birmingham | 2015 |
| Astley Echo Services Ltd | Derby | 2023 |
| Astley Grange Care Home Limited | Holmfirth | 2012 |
| Astley Grange Homes Limited | Bolton | 2013 |
| Astley House Nursing Home Limited | Inverness | 2011 |
| Asto Clinics Charity Ltd | Chorley | 2020 |
| Asto Clinics Ltd | Chorley | 2019 |