| Amici HH Ltd | Hospitality | 2025 |
| Amici Primo Limited | Hospitality | 2025 |
| Amicibistro Ltd | Hospitality | 2023 |
| Amiga Security Systems Limited | Construction | 2003 |
| Amigo Care Services Limited | Health & social care | 2023 |
| Amilia Studios Ltd | Arts & recreation | 2025 |
| Amino Restaurant Ltd | Hospitality | 2025 |
| Amins Limited | Professional & scientific | 2008 |
| Amir Capital Ltd | Real estate | 2018 |
| Amir Holdings Ltd | Wholesale & retail | 2023 |
| Amiraraul Ltd | Administrative & support | 2025 |
| Amiri's Properties Ltd | Real estate | 2023 |
| Amis Property Limited | Real estate | 2012 |
| Amis Residential Limited | Real estate | 2017 |
| Amit Bahl IT Consulting Limited | Information & communication | 2015 |
| Amity Enterprise Ltd | Wholesale & retail | 2023 |
| Amity Tattoo Ltd | Other services | 2021 |
| AMJ Distribution Ltd | Wholesale & retail | 2025 |
| AMJ UK Construction Ltd | Construction | 2018 |
| Amjpef Co-Investment Plan | | 2002 |
| Amjw Holding Ltd | Financial services | 2026 |
| Amjw Property Ltd | Real estate | 2026 |
| AMK & Co Limited | Professional & scientific | 2013 |
| AMK DIY & Crafts Ltd | Wholesale & retail | 2026 |
| AMK Freight Ltd | Transport & logistics | 2026 |
| AMK GP International Limited | Transport & logistics | 2025 |
| AMK Network Ltd | Wholesale & retail | 2026 |
| AMK Trading Ltd | Wholesale & retail | 2019 |
| Amk&Ymh Ltd | Real estate | 2024 |
| AML Accountants Ltd | Professional & scientific | 2022 |
| Ammar Technologies Limited | Information & communication | 2014 |
| Ammonite Capital 2 Limited | Financial services | 2023 |
| Ammonite Capital LLP | | 2023 |
| AMN Relief | Professional & scientific | 2021 |
| Amna Hayyah Limited | Information & communication | 2015 |
| Amna Solutions Limited | Administrative & support | 2014 |
| AMO Group Limited | Professional & scientific | 2016 |
| AMO Pharma Limited | Professional & scientific | 2015 |
| Amo.Wik Limited | Wholesale & retail | 2023 |
| Amon Limited | Professional & scientific | 1980 |
| Amore Real Estate Ltd | Households | 2024 |
| Amoria Limited | Hospitality | 2019 |
| Amoria Private Hire Ltd | Hospitality | 2023 |
| Amorino Cafe Ltd | Hospitality | 2025 |
| Amountsecured Limited | Real estate | 2012 |
| Amour Professional Beauty Limited | Other services | 2020 |
| Amourtubeauty Ltd | Other services | 2022 |
| AMP Auto Werks Ltd | Professional & scientific | 2010 |
| AMP Capital Holdings Limited | Financial services | 2022 |
| AMP Electrical Contractors Limited | Construction | 1985 |
| AMP Facilities Ltd. | Wholesale & retail | 2003 |
| AMP Healthcare Limited | Other services | 2005 |
| Amperor (Europe) Limited | Professional & scientific | 1996 |
| Ampersand Co Studio Ltd | Professional & scientific | 2023 |
| Ampersand Commerce Limited | Information & communication | 2009 |
| Ampg 2 Ltd | Transport & logistics | 2014 |
| Ampli Group Ltd | Professional & scientific | 2020 |
| Ampli Talent Ltd | Administrative & support | 2022 |
| Amplifi Events Ltd | Other services | 2024 |
| Ampvibe Ltd | Wholesale & retail | 2025 |
| Amqi Ltd | Real estate | 2015 |
| AMR Coins Limited | Wholesale & retail | 2013 |
| Amra Developments Limited | Real estate | 2024 |
| Amraz Mohammed Ltd | Other services | 2018 |
| Amritpal Riat Medical Limited | Health & social care | 2015 |
| Amrix Vehicles Ltd | Transport & logistics | 2021 |
| Amrock Ltd | Real estate | 2017 |
| Amroofix Ltd | Construction | 2025 |
| Amrose Associates Ltd | Professional & scientific | 2024 |
| AMS Events (Yorkshire) Limited | Other services | 2013 |
| AMS Franchise Limited | Hospitality | 2011 |
| AMS Scaffolding Solutions Ltd | Construction | 2018 |
| AMS Yorkshire Limited | Construction | 2012 |
| Amsource Technology Limited | Administrative & support | 2010 |
| Amsterlain Limited | Extraterritorial | 1957 |
| AMT Auto Holdings Limited | Financial services | 2025 |
| AMT Contract Hire and Leasing Limited | Administrative & support | 2002 |
| AMT Electrical Contractors Limited | Construction | 2017 |
| AMT Global Investments Limited | Financial services | 2006 |
| AMT Sales Consultancy Ltd | Other services | 2022 |
| AMT Smart Solutions Ltd | Professional & scientific | 2021 |
| AMT Specialist Cars Limited | Wholesale & retail | 2013 |
| AMT Vehicle Rental Limited | Financial services | 1999 |
| AMT Vehicle Solutions Limited | Information & communication | 2010 |
| Amtech AI Ltd Ltd | Information & communication | 2025 |
| Amteus Care Ltd | Administrative & support | 2012 |
| Amtoys Ltd | Wholesale & retail | 2025 |
| Amtredline Property Ltd | Construction | 2011 |
| Amulent Limited | Wholesale & retail | 2013 |
| Amunergy UK Ltd | Arts & recreation | 2025 |
| Amurdaad Ltd | Real estate | 2026 |
| AMV Asset Management Ltd | Real estate | 2020 |
| AMV Joinery Ltd | Construction | 2020 |
| Amvic Building Solutions Ltd | Construction | 2005 |
| Amvic ICF Ltd | Construction | 2012 |
| Amvik Property Management Ltd | Real estate | 2026 |
| AMW Installation Engineers Ltd | Manufacturing | 2011 |
| Amws Services Ltd | Manufacturing | 2020 |
| AMY Brammall Ltd | Professional & scientific | 2020 |
| AMY Dunmall Coaching, Consulting and Facilitation Limited | Professional & scientific | 2023 |