| Allergy & Rhinology Limited | London | 2013 |
| Allergy and Asthma Clinics Limited | London | 2018 |
| Allergy and Immunology Clinics Ltd | Sheffield | 2017 |
| Allergy and Paediatric Clinic (Cheltenham) Ltd. | Birdlip | 2013 |
| Allergy Care Clinic Ltd | London | 2026 |
| Allergy Care Limited | Southampton | 2003 |
| Allergy Diets Ltd | Wirral | 2015 |
| Allergy Healthcare London Ltd | North Finchley | 2025 |
| Allergy International Ltd | Tonbridge | 2022 |
| Allergy Leaders Ltd | Tonbridge | 2020 |
| Allergy London Limited | Bushey | 2016 |
| Allergy MED Ltd | Orpington | 2020 |
| Allergy North West Ltd | London | 2022 |
| Allergy Nurture Care Ltd | Chelmsford | 2025 |
| Allergy Resolutions Limited | Stockport | 2008 |
| Allergy Sleuth Ltd | London | 2026 |
| Allergy Support Limited | Guisborough | 2022 |
| Allergy&Anaphylaxistrust | Ruislip, | 2024 |
| Allergymedic Limited | Barnet | 2016 |
| Allergyrhino Limited | London | 2024 |
| Allerlon Limited | Lincoln | 2019 |
| Allerpack Ltd | Leamington Spa | 2020 |
| Allerston Ltd | Liverpool | 2015 |
| Allerton C&S GL Limited | Watford | 2016 |
| Allerton C&S N Limited | Watford | 2016 |
| Allerton C&S NE Limited | Watford | 2011 |
| Allerton C&S SC Limited | Watford | 2004 |
| Allerton C&S SE Limited | Watford | 2011 |
| Allerton C&S SW Limited | Watford | 2009 |
| Allerton Dental Limited | London | 2014 |
| Allerton Foot Clinic Limited | Liverpool | 2014 |
| Allesbee Ltd | Hailsham | 2025 |
| Alleset Healthcare UK Limited | London | 2013 |
| Allesley Childrens Care Ltd | Coventry | 2018 |
| Allesley Practice Limited | Coventry | 2022 |
| Allestree Aesthetics Limited | Belper | 2017 |
| Alletante Limited | Finchley | 2017 |
| Alleveda Group Limited | Cardiff | 2024 |
| ALLEVI8 Limited | Warminster | 2009 |
| Allevia Care Ltd | Portsmouth | 2026 |
| Alleviate Mental Health Limited | London | 2025 |
| Alley Akoh Art Therapy Ltd | London | 2020 |
| Alleynaglyne Ltd | Bradford | 2025 |
| Allfarthing Care Services Limited | London | 2022 |
| Allfit Academy Ltd | Southall | 2024 |
| Allfor Care (Croydon) Limited | Harrow | 2025 |
| Allfor Care (Doncaster) Limited | Harrow | 2025 |
| Allfor Care (Hammersmith) Limited | Harrow | 2025 |
| Allfor Care (Haringay) Limited | Harrow | 2025 |
| Allfor Care (Hounslow) Limited | Harrow | 2025 |
| Allfor Care Ambulance Limited | Thornton Heath | 2025 |
| Allfor Care Services Limited | | 2004 |
| Allforlove Childcare Limited | Oldham | 2024 |
| Allgrace Limited | London | 2005 |
| Allhands Care Ltd | Luton | 2016 |
| Alli Optics Ltd | Bolton | 2024 |
| Alliagbor Limited | Hyde | 2020 |
| Alliance Advice and Support Limited | Glasgow | 2019 |
| Alliance Care (Dales Homes) Limited | Brighton | 1999 |
| Alliance Care and Support Limited | Clacton-On-Sea | 2003 |
| Alliance Care Holding Limited | Northwood | 2024 |
| Alliance Care Homes Limited | Clacton-On-Sea | 2013 |
| Alliance Care Ltd | Stoke On Trent | 2016 |
| Alliance Care Solutions Limited | Harrow | 2006 |
| Alliance Caring Ltd | Sheffield | 2018 |
| Alliance Clinical Consulting Ltd | Birmingham | 2025 |
| Alliance Clinical Services Limited | Birmingham | 2021 |
| Alliance Clinicals Ltd | Cardiff | 2016 |
| Alliance Community Health CIC | Poole | 2026 |
| Alliance Community Home Care Ltd | Holmfirth | 2021 |
| Alliance Dental Academy Limited | Stevenage | 2020 |
| Alliance Dental Care Limited | Stevenage | 2011 |
| Alliance Dentistry Limited | Ludlow | 2015 |
| Alliance Diagnostic Services Limited | Warwick | 2000 |
| Alliance Family Foundation Limited | Manchester | 1968 |
| Alliance for Better Care CIC | Horley | 2014 |
| Alliance for Camphill Ltd. | Stroud | 2018 |
| Alliance Foster Care Limited | Bolton | 2001 |
| Alliance Health Group Limited | Birmingham | 2015 |
| Alliance Healthcare Worldwide Limited | Glasgow | 2023 |
| Alliance Home Care (Learning Disabilities) Limited | Woking | 1996 |
| Alliance Home Care Limited | Woking | 1995 |
| Alliance House Foundation | London | 1942 |
| Alliance Housing Support Ltd | Sheffield | 2019 |
| Alliance Living Care Ltd | Portishead | 2001 |
| Alliance Medical Limited | Warwick | 1987 |
| Alliance Occupational Health Ltd | Bishop Auckland | 2025 |
| Alliance of Bioenergetic Consultants Limited | Braintree | 2012 |
| Alliance of Medical Experts Limited | Leeds | 2013 |
| Alliance Performance Healthcare Ltd | Hastings | 2015 |
| Alliance Podiatry Ltd | Gateshead | 2019 |
| Alliance Point Limited | Norwich | 2014 |
| Alliance Primary Care Limited | Rotherham | 2019 |
| Alliance Psychological Services Ltd | Stockton-On-Tees | 2006 |
| Alliance Sedation Limited | London | 2020 |
| Alliance Support Living Ltd | London | 2026 |
| Alliance Surgical Corporate Health Limited | Birmingham | 2012 |
| Alliance Surgical Investments Limited | Birmingham | 2004 |
| Alliance Surgical Investments Secretarial Services Limited | Birmingham | 2007 |
| Alliance to END Malnutrition and Hunger Limited | London | 2022 |