| Amaad Holdings Ltd | London | 2019 |
| Amaad Venues Limited | London | 2025 |
| Amaar Akbar Boxing Ltd | Batley | 2020 |
| Amabala Productions Limited | Borehamwood | 1999 |
| Amadan Ensemble | Belfast | 2018 |
| Amadeo Art Ltd | London | 2002 |
| Amadeo Ltd | London | 2000 |
| Amadeus Chorus and Orchestra | Wotton-Under-Edge | 1998 |
| Amadeus Fitness Limited | Altrincham | 2024 |
| Amadeus Publishing Limited | London | 2017 |
| Amadeus Tour Ltd | London | 2026 |
| Amahla Ltd | London | 2026 |
| Amalgamated Scrap Iron Limited | Craven Arms | 2021 |
| Amalthea Limited | Perivale | 1999 |
| Amalu Ltd | Epsom | 2024 |
| Aman BCL Ltd | London | 2023 |
| Amanah Media Group Ltd. | Cardiff | 2025 |
| Amanas Music Limited | Cambridgeshire | 2000 |
| Amanda Alder Dance Academy Limited | Standlake | 2011 |
| Amanda Bastin Art Limited | London | 2024 |
| Amanda Beckman Associates Ltd | Stanmore | 2011 |
| Amanda Bright Creative Ltd | London | 2021 |
| Amanda Calland Pilates Limited | Poole | 2018 |
| Amanda Clark Arts Ltd | Braintree | 2020 |
| Amanda Dormon Limited | St. Leonards-On-Sea | 2006 |
| Amanda Fawcett Productions Ltd | Bristol | 2025 |
| Amanda Frost Ltd | London | 2007 |
| Amanda Heath Art Ltd | Brighton | 2021 |
| Amanda J Thompson Limited | Blackpool | 2008 |
| Amanda Jayne Education Limited | Derby | 2011 |
| Amanda LEE Tattoo Ltd | Glasgow | 2023 |
| Amanda Loverseed Illustrations Ltd | Emsworth | 2013 |
| Amanda Mealing Limited | Peterborough | 2004 |
| Amanda Miller WIG Studio Limited | London | 2025 |
| Amanda Monk Limited | Waterlooville | 2008 |
| Amanda Nolan School of Performing Arts Ltd | Norwich | 2018 |
| Amanda's Action Club Parties Limited | Greenford | 2012 |
| Amande Concerts Limited | Canterbury | 2011 |
| Amandiers Limited | London | 2023 |
| Amani Creatives C.I.C. | Manchester | 2021 |
| Amani Healthclub Luton Ltd | London | 2025 |
| Amanuensis Theatre Company Ltd | High Peak | 2017 |
| Amapiano Lituation Limited | London | 2025 |
| Amar England Limited | Bradford | 2025 |
| Amar RAI Ltd | Ewell | 2021 |
| Amara Events Limited | Ilford | 2023 |
| Amara Promotions Limited | Ilford | 2022 |
| Amarachisom Ltd | London | 2022 |
| Amaranth Enterprises Ltd | London | 2012 |
| Amaranth Film Partners Limited | London | 1993 |
| Amarc (2002) Limited | Kington | 2001 |
| Amari Haus Limited | London | 2025 |
| Amariah Bling Accessories Ltd | London | 2021 |
| Amaris Group Media Ltd | Sutton | 2025 |
| Amart Capital Limited | London | 2017 |
| Amartrosa Limited | Monmouth | 2021 |
| Amary Yoga Retreats Ltd | Barnsley | 2025 |
| Amasing Arts | Wrexham | 2019 |
| Amass Enterprise Limited | London | 2025 |
| Amastarike Ltd | Mildenhall | 2025 |
| Amasya Limited | Haywards Heath | 2012 |
| Amata Benedict Ltd | London | 2025 |
| Amateur Athletic Association Limited | Northwich | 1948 |
| Amateur Bowling Circuit Ltd | Littlehampton | 2025 |
| Amateur Boxing Alliance (England) C.I.C. | London | 2016 |
| Amateur Boxing Union Limited | Leeds | 2002 |
| Amateur Darts Organisation Ltd | Nuneaton | 2024 |
| Amateur Golf Tour Limited | Redditch | 2013 |
| Amateur Judo Association Limited | Sutton Coldfield | 2004 |
| Amateur Martial Association Limited | Rochdale | 2012 |
| Amateur Motor Cycle Association Benevolent Fund | Cannock | 2009 |
| Amateur Motor Cycle Association Limited | Cannock | 1983 |
| Amateur Poker Limited | Caterham | 2005 |
| Amateur Swimming Federation of Great Britain Limited | Loughborough | 2001 |
| Amath the Gardener Limited | Coventry | 2025 |
| Amati Orchestra Limited | London | 2011 |
| Amatour Golf Ltd | Verwood | 2020 |
| Amazed Escapes Limited | London | 2016 |
| Amazing Activity Limited | London | 2011 |
| Amazing Competitions Limited | St. Helens | 2025 |
| Amazing Equipment Limited | London | 2018 |
| Amazing Events Limited | Brentwood | 2025 |
| Amazing Feat Limited | Stourbridge | 2007 |
| Amazing FUN & Entertainment UK Limited | London | 2024 |
| Amazing Grace Music Ltd | Paisley | 2023 |
| Amazing Sports Tours Ltd | Wilmslow | 2024 |
| Amazon Leisure (UK) Limited | Attleborough | 1999 |
| Amazonia Associates Limited | Lowestoft | 2003 |
| Amazonia Music Theatre Company Limited | London | 2020 |
| Amazonian Fit Limited | Newtownabbey | 2022 |
| Amazonian Health & Fitness Limited | Marlborough | 2019 |
| AMB Leisure Services Ltd | Worcester | 2020 |
| AMB London Limited | Epsom | 2013 |
| AMB Management & Consultancy Limited | Bedford | 2018 |
| Amb.Hiperformance Ltd | Sudbury | 2026 |
| Ambar Sports Academy Ltd | London | 2017 |
| Ambassador (Prestwick) Limited | Glasgow | 2011 |
| Ambassador Band Ltd | Guildford | 2014 |
| Ambassador Leisure Limited | Whitburn | 1997 |
| Ambassador Padel Ltd | Manchester | 2026 |