| AM Magnets (UK) Limited | Sheffield | 2002 |
| AM Nurburgring Racing Limited | Warwick | 2012 |
| AM Safety Specialists Limited | Braintree | 2012 |
| AM Services (South East) Ltd | Benfleet | 2011 |
| AM Signature Ltd | Crewe | 2012 |
| AM Trading & Distribution Ltd | Birmingham | 2019 |
| Am&Pm Limited | Rochester | 2014 |
| AM4SYSTEMS Ltd | London | 2010 |
| AM4ZON Ltd | Harrogate | 2019 |
| Am:Pm Creative Limited | Kent | 2004 |
| AMA Energy Management Limited | London | 2003 |
| AMA Investment Properties Limited | Telford | 2019 |
| AMA Management Holdings (UK) Limited | Worsley | 2016 |
| AMA Management Solutions Limited | Worsley | 2016 |
| AMA Properties Ltd | Swansea | 2011 |
| AMA Underwriting Services Ltd | London | 2010 |
| Amaanah Property Ltd | London | 2024 |
| Amacam Ltd | Reading | 2014 |
| Amadeo Consulting Services Ltd | Wallington | 2017 |
| Amadeo Marine Ltd | London | 2024 |
| Amadeo Yachting Ltd | London | 2024 |
| Amadeus Film Productions Limited | London | 1987 |
| Amadeus Impact Ltd | London | 2024 |
| Amadi Dental Limited | Chatham | 2022 |
| Amadursgrid Media Hub & Technologies Ltd | Liverpool | 2024 |
| Amaize Drinks Limited | Bromley | 2018 |
| AMAKS2017 Limited | Manchester | 2017 |
| Amal Aesthetica Ltd | Burton-On-Trent | 2022 |
| Amal Amini Ltd | Hounslow | 2025 |
| Amal Investments Limited | Croydon | 1998 |
| Amalee Accounting Solutions Limited | New Milton | 2010 |
| Amalgam Type Ltd | London | 2025 |
| Amalgamated Arts Limited | Hockley | 2009 |
| Amanara Limited | London | 2003 |
| Amanda Bains Consultant Ltd | Nottingham | 2016 |
| Amanda Boyd Consultancy Ltd | Wilmslow | 2017 |
| Amanda Heffernan Interiors Ltd | Leigh-On-Sea | 2024 |
| Amanda Helen Brown Limited | Chipping Norton | 2024 |
| Amanda Helen Clarke Limited | Chipping Norton | 2024 |
| Amanda International Co., Limited | Beckenham | 2024 |
| Amanda Janes Florist Limited | Dorchester | 2024 |
| Amanda Presha Ltd | Salford | 2015 |
| Amanda Stocks Publicity Ltd. | West Malling | 2015 |
| Amanda Townsend Ltd | Cardiff | 2025 |
| Amaneti Investment Limited | London | 2023 |
| Amaneti Limited | London | 2023 |
| Amanni Ltd | Durham | 2021 |
| Amano Blick International (Europe) Limited | Rotherham | 1996 |
| Amansellers Limited | Stoke-On-Trent | 2024 |
| Amao Products Limited | Kettering | 2016 |
| Amar Marine Ltd | London | 2022 |
| Amara Construction Ltd | Poole | 2017 |
| Amara Consultancy Limited | Tamworth | 2025 |
| Amara Group Ltd | Preston | 2024 |
| Amarain Cars Limited | London | 2021 |
| Amarapura Management Ltd | Edinburgh | 2011 |
| Amardeep Singh Madahar Limited | Bilston | 2024 |
| Amargy Ltd | London | 2023 |
| Amari Plastics Limited | Chertsey | 2017 |
| Amari Plastics Pension Trustees Limited | Chertsey | 1999 |
| Amark Care Ltd | Portsmouth | 2025 |
| Amarna House Management Company Limited | Abingdon-On-Thames | 2006 |
| Amateur Footballer Ltd | Gloucester | 2025 |
| Amathus Wines Limited | Park Royal | 2009 |
| Amatique Ltd | London | 2020 |
| Amatis & Shatilah Investment Limited | London | 2022 |
| Amax Corporation Limited | Stafford, | 2019 |
| Amaxus Management Ltd | Bedale | 2012 |
| Amaze Limited | Wolverhampton | 2025 |
| Amazen Ltd | Romford | 2011 |
| Amazing Blooms Ltd | Bristol | 2019 |
| Amazing Floorcare Ltd | Exmouth | 1998 |
| Amazing Golden Waves Ltd | London | 2021 |
| Amazing Grace Entertainment Ltd | Huddersfield | 2023 |
| Amazing Grace Social Care Limited | Manchester | 2021 |
| Amazing Innovation Education Limited | London | 2015 |
| Amazon Chemicals (UK) Ltd | Beckenham | 2014 |
| Amazon Civils Limited | Solihull | 2006 |
| Amazon Computers Limited | Hatfield | 1983 |
| Amazon Energy Limited | Hatfield | 1980 |
| Amazon Forest People Ltd | Hornchurch | 2020 |
| Amazon Systems Limited | Hatfield | 1983 |
| Amazon Ventures (UK) Limited | Hounslow | 2001 |
| Amazon World Limited | Berkshire | 1998 |
| Amazone Store Ltd | Burnley | 2024 |
| Amazonia Trade Limited | London | 1988 |
| AMB Services Ltd | Leighton Buzzard | 1997 |
| Ambaglo Limited | London | 1998 |
| Ambarrow Wood Ltd | Badminton | 2018 |
| Ambasciata DI Sicilia Ltd | London | 2005 |
| Ambassador Corporate Limited | London | 2013 |
| Ambassador Hotels (Bournemouth) Limited | Hale | 2004 |
| Ambassador House (Carlton Hill) Limited | Biggleswade | 1995 |
| Ambassador Interiors (UK) Limited | Kings Lynn | 2008 |
| Ambassadors of Luxury Limited | London | 2011 |
| Ambell Overseas Health for Africa Ltd | Horley | 2013 |
| Amber 2010 Limited | London | 2010 |
| Amber Breeze Limited | Blackpool | 2022 |
| Amber Composites Limited | Nottingham | 2013 |
| Amber Constructions Services Limited | Ilford | 2023 |