| ALL Things SEN Ltd | Newport | 2024 |
| ALL Together Services Limited | Derby | 2021 |
| ALL Training and Development Ltd | Nottingham | 2016 |
| ALL Training Matters Ltd | London | 2013 |
| ALL Training Solutions Ltd | Glasgow | 2021 |
| ALL Wales Business School Limited | Pontypridd | 1993 |
| ALL Walks of Life Network CIC | Nottingham | 2022 |
| ALL Ways Learning Ltd | Stoke-On-Trent | 2025 |
| ALL Weighs UP Ltd | Malpas | 2023 |
| ALL World Gayatri Pariwar London (Awgp London) CIC | Hayes | 2025 |
| ALL YOU CAN BE Ltd | Beaminster | 2023 |
| ALL YOU Need IS Love UK | Montrose | 2012 |
| ALL Your Training Services Ltd | Bradwell | 2010 |
| All-In-One Global Consultancy Ltd | Hounslow | 2024 |
| All-Inspired Ltd | Huddersfield | 2024 |
| All-Pro Performance Ltd | Brecon | 2021 |
| All-Stars Activity Community Interest Company | London | 2019 |
| ALL4INCLUSION CIC | Manchester | 2022 |
| ALL4ONE4ALL Limited | Southend-On-Sea | 2022 |
| ALL4SPORT Limited | Hertford | 2007 |
| ALL4YOUTH Community Interest Company | Rochdale | 2019 |
| Allaboutantenatal Limited | Borehamwood | 2019 |
| Allaboutdanceuk Ltd | London | 2022 |
| Allagefitness Limited | Rotherham | 2016 |
| Allam Services Ltd | London | 2025 |
| Allan Haddow Limited | Lincolnshire | 2000 |
| Allan Harris Safety & Compliance Consultant Limited | Liverpool | 2018 |
| Allanfearn, Consultancy, Conferencing and Training (Acct) Ltd | Glasgow | 2007 |
| Allchild Limited | London | 2014 |
| Alldaysafety Training Limited | St Ives | 2020 |
| Alleeduvant Ltd | London | 2025 |
| ALLEGIANCE2LEARNING Ltd | London | 2021 |
| Allegna | Croydon | 2011 |
| Allegra Music Limited | Ashby-De-La-Zouch | 2004 |
| Allegro School of Gymnastics Limited | Keston | 2017 |
| Allegro Theatre Dance Academy Ltd | Doncaster | 2018 |
| Allen Applied Ltd | Tunbridge Wells | 2026 |
| Allen Speech & Language Ltd | Maldon | 2013 |
| Allen Sports Limited | Worcestershire | 2022 |
| Allen's Montessori Day Nursery Limited | Norbury | 2005 |
| Allenby Training Services Limited | Lincoln | 1999 |
| Allenheads Contemporary Arts Limited | Hexham | 2008 |
| Allenvironmental Training & Consultancy Ltd | Northampton | 2018 |
| Allergy Educated C.I.C. | Newcastle Upon Tyne | 2024 |
| Allergy Focus Ltd | Rochester | 2026 |
| Allerthorpe Education Limited | Guildford | 2023 |
| Allerton School of Motoring Limited | Bradford | 2025 |
| Allery Education Limited | Newcastle Upon Tyne | 2022 |
| Allesley Park Community Association Ltd | Coventry | 2003 |
| Allestree Training Limited | London | 2024 |
| Allestree Woodlands School | Derby | 2012 |
| Allexavior Limited | Surrey | 2025 |
| Allexton Community Nursery C.I.C. | Leicester | 2006 |
| Alley Strength and Nutrition Ltd | Watford | 2023 |
| Alleyn Court (Preparatory) Westcliff Limited | Southend On Sea | 1952 |
| Alleyn's School | London | 2015 |
| Alleyne Creative Trust Ltd | London | 2025 |
| Alleyne& CIC | London | 2023 |
| Alleyne's Academy | Stone | 2013 |
| Alleyn’S School International Limited | Dulwich | 2022 |
| Allfaden Ltd | Coventry | 2021 |
| Allfit Performance Ltd | Edinburgh | 2021 |
| Allgolfpga Ltd | Addlestone | 2022 |
| Alliance & Associates Ltd | London | 2013 |
| Alliance Alternative Education CIC | Southport | 2023 |
| Alliance Care Services Ltd | Surrey | 2005 |
| Alliance Education Limited | Bradford | 2017 |
| Alliance for Access Limited | Derby | 2020 |
| Alliance for Development of Tamil Language, Culture & Heritage | Essex | 2021 |
| Alliance for Inclusive Education | London | 2006 |
| Alliance for Microsimulation and Policy Analysis CIC | Cambridge | 2024 |
| Alliance for Responsible Citizenship Limited | London | 2016 |
| Alliance for Women and Girls Limited | London | 2023 |
| Alliance Francaise - Devon Ltd | Totnes | 2007 |
| Alliance Francaise DE Cambridge | Cambridge | 2002 |
| Alliance Francaise DE Londres Limited | | 1999 |
| Alliance Francaise DE Milton Keynes | Milton Keynes | 2003 |
| Alliance JIU Jitsu Newcastle Limited | North Shields | 2026 |
| Alliance Jiu-Jitsu UK Limited | London | 2021 |
| Alliance Learning | Bolton | 1982 |
| Alliance Learning Training Limited | Bolton | 2016 |
| Alliance Leisure Services Limited | Bristol | 1992 |
| Alliance Muay Thai Ltd | Liverpool | 2024 |
| Alliance Training Limited | Nottingham | 2002 |
| Alliance-Pioneer Training Ltd | Plymouth | 2022 |
| Alliance.Ik Ltd | Coventry | 2025 |
| Allied Aspects Limited | Mid Glamorgan | 1993 |
| Allied Campuses Ltd | Wallasey | 2023 |
| Allied Driving Schools Ltd | New Romney | 1999 |
| Allied Health Training Limited | Manchester | 2022 |
| Allied Rescue Training Ltd | Liverpool | 2023 |
| Allied Schools Agency Limited | Coventry | 1935 |
| Allies Care and Support Services Limited | Birmingham | 2020 |
| Allies for Inclusion Ltd | Derby | 2022 |
| Allies Network C.I.C. | Birmingham | 2014 |
| Alligan Limited | London | 1995 |
| Allison CPC Ltd | Manchester | 2026 |
| Allison Edwards | London | 2021 |
| Allo Academy Ltd | London | 2025 |
| Allocator Training Ltd | London | 2024 |