| Amen Band Limited | Mansfield | 2025 |
| American Amusements (Wokingham) Limited | Wimborne | 2016 |
| American Amusements Holdings Limited | Wimborne | 1993 |
| American Amusements Limited | Wokingham | 1997 |
| American CUP Car Racing (UK) Ltd | Redditch | 2009 |
| American Golf (Leisure) Limited | Warrington | 2021 |
| American Jukebox Limited | Abingdon | 2005 |
| American Museum & Gardens | Bath And North East Somerset | 2004 |
| American R.V.Club Limited | Bristol | 2022 |
| American Recreational Vehicle Club Limited | Bristol | 2022 |
| American Rugby Scholarships Ltd | Peterborough | 2025 |
| American Theater of London Ltd | London | 2024 |
| American Theme Events Limited | Maidstone | 1995 |
| Americana Blues Festival Limited | North Shields | 2024 |
| Ameritz Music Limited | Warrington | 2007 |
| Ameron Co. Ltd | Croydon | 2018 |
| Amerotke Books Limited | London | 2005 |
| Amerra Limited | Watford | 1999 |
| Amersham AGP Ltd | Great Missenden | 2014 |
| Amersham and Chalfont Hockey Community Sports Club Limited | Great Missenden | 2014 |
| Amersham Coaching Ltd | Amersham | 2021 |
| Amersham Cricket Club Limited | Amersham | 2020 |
| Amersham Cricket Club Members Limited | Amersham | 2020 |
| Amersham Festival of Music Limited | Gerrards Cross | 2025 |
| Amersham Gardening Ltd | Amersham | 2020 |
| Amersham Health & Fitness Limited | Amersham | 2017 |
| Amersham Hill Sports Club Limited | High Wycombe | 1960 |
| Amersham Museum Limited | Amersham | 1984 |
| Amersham TAE Kwon DO Limited | Rickmansworth | 2008 |
| Amerton Farm Limited | Stafford | 2016 |
| Ames Yavuz Ltd | Ruislip, | 2024 |
| Amesbury Rugby Club Ltd | Salisbury | 2018 |
| Amethyst Arts Ltd | Bruton | 2026 |
| Amethyst Entertainment Limited | London | 2019 |
| Amezpo Ltd | Tamworth | 2024 |
| AMF 1AD Limited | Harrogate | 2011 |
| AMF Adventures Limited | Ellesmere | 2026 |
| AMF Collective Limited | London | 2022 |
| AMF Creative Partnerships Ltd | London | 2026 |
| AMF World Limited | Mildenhall | 2019 |
| AMF Wyatt Limited | Edinburgh | 2025 |
| AMG Invictus Fitness Ltd | West Bromwich | 2024 |
| AMG Legacy Limited | Nottingham | 2026 |
| AMG Leisure Limited | Birmingham | 2019 |
| AMG Lifting LAB Ltd | Warrington | 2018 |
| AMG Shooting Academy Limited | Derby | 2023 |
| AMG Studios Ltd | Manchester | 2022 |
| Amgboys. Ltd | Bicester | 2026 |
| Amgh Leisure Limited | Birmingham | 2022 |
| Amgk Coaching Limited | Weston-Super-Mare | 2019 |
| Amgs Leisure Limited | Ashford | 2020 |
| Amhuinnsuidhe Castle Limited | Edinburgh | 2010 |
| AMI Golf Limited | Doncaster | 2025 |
| AMI Lillybet Ltd | Newcastle Upon Tyne | 2024 |
| Amica Gyms Limited | London | 2024 |
| Amici Art Ltd | Hastings | 2025 |
| Amici Musicali Limited | Exeter | 2001 |
| Amici Sports Management Limited | Ilford | 2025 |
| Amick Productions Limited | Borehamwood | 2015 |
| Amidat Giwa Ltd | London | 2024 |
| Amidst the Chaos of Discordianism, WE Find Wisdom, Freedom, and Laughter. Recognise the Finite, for Even in Disorder, OUR Scope IS Beautifully Limited | Gravesend | 2024 |
| Amie BLU Ltd | Brighton | 2023 |
| Amie Carter Ltd | London | 2024 |
| Amie True Musicians Ltd | Stourbridge | 2024 |
| Amiee & Claires Blissful Creations Ltd | Colchester | 2025 |
| Amigo Leisure Ltd | Kilmarnock | 2019 |
| Amigo Motorsport Limited | Ingatestone | 2026 |
| Amigo Parties Ltd | Greenford | 2022 |
| Amigos Event Management Ltd | Llanelli | 2024 |
| Amigos Para Siempre Limited | London | 2022 |
| Amigos Worldwide Sport Consultant Limited | Salford | 2010 |
| Amii Harwood Artist Limited | Norwich | 2024 |
| Amii Limited | Birmingham | 2026 |
| Amiiigos Creative Ltd | London | 2025 |
| Amiki Studios Limited | London | 2022 |
| Amilia Studios Ltd | Leeds | 2025 |
| Amina Khayyam Dance Company | Slough | 2013 |
| Amina Limited | Bromsgrove | 2026 |
| Amina Malik Gallery Ltd | London | 2019 |
| Amir London Limited | Dartford | 2015 |
| Amir Tattoo and Piercing Studio Limited | Liverpool | 2024 |
| Amiralis Ltd | Marlow | 2021 |
| Amirlameyratattoo Limited | Bristol | 2025 |
| Amit Katwala Ltd | London | 2018 |
| Amity Arts Limited | Bishop'S Stortford | 2025 |
| Amity Fitness Limited | Coventry | 2023 |
| Amity Theatre Ltd | Brackley | 2024 |
| AMK Funk Ltd | London | 2023 |
| Amkk School Limited | Walsall | 2022 |
| AML Football Agent Services Ltd | Lymm | 2024 |
| Amlgt Ltd | St. Albans | 2025 |
| Amlind (UK) Limited | Llanelli | 1999 |
| Amlor Music Limited | London | 2018 |
| AMM Bloodstock Limited | London | 2014 |
| AMM Studio Limited | London | 2024 |
| Amma Communications Ltd | Glasgow | 2023 |
| Amman & District Motor Club Limited | Neath | 1998 |
| Amman Valley Trotting Club Limited | Ammanford | 2004 |
| Ammanford AFC Ltd | Ammanford | 2020 |
| Ammanford RFC Limited | Ammanford | 2015 |