| Amateaches Ltd | London | 2025 |
| Amateur Darts Circuit E F Limited | Peterborough | 2023 |
| Amateur World Football Association | Boston | 2023 |
| Amateur World Football CUP Limited | Boston | 2025 |
| Amaths Tutors Ltd | Glasgow | 2023 |
| Amatsu UK Limited | | 1996 |
| Amauzari Progress Union International Limited | Sutton | 2025 |
| Amaven Limited | Stockport | 2014 |
| Amaze Beauty and Training Ltd | Retford | 2026 |
| Amazelab Ltd | Barnsley | 2020 |
| Amazeswim Ltd | Colchester | 2024 |
| Amazigh Community Organisation Ltd | Manchester | 2020 |
| Amazikidz Ltd | Orpington | 2006 |
| Amazin U Academy Ltd | London | 2026 |
| Amazing 3D Goals Ltd | West Malling | 2021 |
| Amazing Activities Ltd | Clacton-On-Sea | 2015 |
| Amazing Brains N. Ireland CIC | Belfast | 2011 |
| Amazing Futures Limited | London | 2025 |
| Amazing Grace Early Years Childcare Ltd | Leeds | 2016 |
| Amazing Kids Club Ltd | London | 2019 |
| Amazing Minds Centre for Learning Ltd | Herne Bay | 2024 |
| Amazing Owls Educational Play Ltd | Scarborough | 2018 |
| Amazing Success Limited | Leigh-On-Sea | 2017 |
| Amazingcpd Ltd | Broseley | 2024 |
| Amazingkids.Com Limited | Middlesex | 2007 |
| AMAZON24 Fit CIC | Gillingham | 2026 |
| AMAZON24 PT Academy Ltd | Gillingham | 2025 |
| Amazonas Comics Community Interest Company | Richmond | 2019 |
| Amazonian Wellbeing Ltd | Whitstable | 2025 |
| Amazonlearn Childcare Ltd | Grays | 2022 |
| Amazy Education Limited | Middlesex | 2020 |
| AMB Accounting Academy Ltd | Bradford | 2026 |
| AMB Driving Tuition Ltd | Exeter | 2016 |
| Amb-Give Hope Humanitarian Foundation | Sheffield | 2020 |
| Amba Training Ltd | Bradford | 2011 |
| Ambash Ltd | London | 2025 |
| Ambassador Club Ltd | London | 2021 |
| Ambassador College. | Market Harborough | 1980 |
| Ambassador for Christ Limited | London | 2023 |
| Ambassador of Light Ltd | London | 2025 |
| Ambassador Training Academy Ltd | Prescot | 2023 |
| Ambassador Training and Consultancy Limited | Scunthorpe | 2013 |
| Amber BEE CIC | Chester | 2022 |
| Amber Education (UK) Services Ltd. | London | 2015 |
| Amber Education Ltd | Wolverhampton | 2017 |
| Amber Green Education Limited | Ashford | 2009 |
| Amber MAY Day Nurseries Ltd | Longcross | 2016 |
| Amber Monkey Ltd | Cardiff | 2019 |
| Amber Oak Holdings Limited | Cambridge | 2026 |
| Amber Publications & Training Limited | Birmingham | 2008 |
| Amber School of Motoring Ltd | Southall | 2026 |
| Amber Trading Services Ltd | London | 2026 |
| Amber Training Ltd | London | 2025 |
| Amber Ventures Ltd. | Manchester | 2017 |
| Amberdene Enterprises Limited | Somerset | 1990 |
| Ambergale Ltd | Finchley | 2001 |
| Amberleigh Care Holdings Limited | Welshpool | 2017 |
| Amberleigh Care Limited | Powys | 2004 |
| Amberley Nursery Limited | Twickenham | 2003 |
| Amberpath Ltd | Uxbridge | 2025 |
| Ambers Attic Limited | Altrincham | 2002 |
| Amberstone Associates Limited | Bury St. Edmunds | 2010 |
| Ambertec Opportunities Ltd | Hitchin | 2013 |
| Amberwood Learning CIC | Brockenhurst | 2018 |
| Amberósia Ltd | St. Albans | 2026 |
| Ambett Education Ltd | London | 2023 |
| Ambika. Thamotheram Fine Arts Academy UK Ltd | Arkley | 2024 |
| Ambikeskool Ltd | Mansfield | 2019 |
| Ambios Limited | Devon | 2001 |
| Ambit Youth Ltd | Wallington | 2020 |
| Ambition Centre for Training Limited | Glenrothes | 2005 |
| Ambition Coach Ltd | Oxted | 2019 |
| Ambition Community Trust | Manchester | 2024 |
| Ambition Education Trust | St Albans | 2011 |
| Ambition in Mind CIC | Walsall | 2024 |
| Ambition Institute | London | 2012 |
| Ambition of Avtar Ltd | Hounslow | 2022 |
| Ambition Sports Coaching Ltd | Leicester | 2021 |
| Ambition Teacher Training | London | 2023 |
| Ambition Tuition Ltd | Nottingham | 2022 |
| Ambition Unlimited CIC | Sheffield | 2019 |
| Ambitions First Education Ltd | Nottingham | 2025 |
| Ambitions Gymnastics Ltd | Skipton | 2018 |
| AMBITIONS4KIRKLEES CIC | Mirfield | 2008 |
| AMBITIONS4LIFE Ltd | Mirfield | 2022 |
| Ambitious About Autism | London | 1997 |
| Ambitious About Autism Schools Trust | London | 2012 |
| Ambitious Academy Social Enterprise CIC | London | 2017 |
| Ambitious Breakthrough Club Ltd | Liphook | 2024 |
| Ambitious Education Ltd | Bournemouth | 2023 |
| Ambitious Minds Ltd | Liverpool | 2009 |
| Ambitious Results Ltd | Sheffield | 2022 |
| Ambitiously Aligned Limited | Waltham Abbey | 2024 |
| Ambleford Ltd | Tunbridge Wells | 2015 |
| Ambourne House Limited | Bristol | 2006 |
| Ambreen Make-Up Training Limited | London | 2018 |
| Ambrose Education Limited | London | 2026 |
| Ambrose Lynch Limited | Reading | 2018 |
| Ambrose Nursery Ltd | Oldham | 2002 |
| Ambulance and Medical CPD Limited | Llanelli | 2020 |