| Amber Infrastructure Services Limited | Professional & scientific | 2024 |
| Amber Jacket Ltd | Administrative & support | 2011 |
| Amber Lion Yachts Ltd | Real estate | 2022 |
| Amber Management and Engineering Services Limited | Professional & scientific | 1999 |
| Amber Resourcing Limited | Administrative & support | 2019 |
| Amber Task Ltd | Hospitality | 2012 |
| Amberley Hotel Company Limited | Hospitality | 1966 |
| Amberley Investment Management Ltd | Real estate | 2024 |
| Amberley Lodge (Yate) Management Company Limited | Households | 2018 |
| Amberly Homes Ltd | Construction | 2018 |
| Amberpig Ltd | Other services | 2014 |
| Amberquin Limited | Professional & scientific | 2010 |
| Amberton Consulting Limited | Real estate | 2014 |
| Ambi Link College Ltd | Extraterritorial | 2013 |
| Ambience Landscapes Limited | Administrative & support | 2003 |
| Ambient Bathrooms Limited | Construction | 2015 |
| Ambio Patient Care Services Ltd | Health & social care | 2025 |
| Ambition Community Energy C.I.C. | Energy | 2018 |
| Ambition Community Homes | Construction | 2022 |
| Ambition Lawrence Weston | Health & social care | 2012 |
| Ambiverse Films Ltd | Information & communication | 2015 |
| Ambleside Property Ventures Ltd | Real estate | 2019 |
| Amblr Studio Ltd | Professional & scientific | 2024 |
| Ambo Developments Ltd | Real estate | 2007 |
| Ambourne House Limited | Education | 2006 |
| Ambra Vale Studios Ltd | Real estate | 2019 |
| Ambrad Holdings Ltd | Financial services | 2025 |
| Ambrad Property Management Ltd | Real estate | 2025 |
| Ambraplus Ltd | Information & communication | 2025 |
| Ambridge (Talina) LLP | | 2024 |
| Ambro Systems Limited | Wholesale & retail | 2017 |
| Ambrogio Coletti Ltd | Information & communication | 2023 |
| Ambrose Productions Ltd | Arts & recreation | 2014 |
| AMC Cleaning Limited | Administrative & support | 2020 |
| AMC Track Ltd | Transport & logistics | 2017 |
| Amcor Asia Holdings Limited | Professional & scientific | 2020 |
| Amcor Europe Group Management | Professional & scientific | 2001 |
| Amcor European Investment Holdings Limited | Professional & scientific | 2009 |
| Amcor Flexibles Cramlington Limited | Extraterritorial | 1989 |
| Amcor Flexibles Latin America Holding Limited | Financial services | 2021 |
| Amcor Flexibles UK Holding Limited | Professional & scientific | 2001 |
| Amcor Flexibles UK Limited | Manufacturing | 1993 |
| Amcor Flexibles Winterbourne Limited | Manufacturing | 1989 |
| Amcor Group Finance PLC | Administrative & support | 2024 |
| Amcor Holdco 3 | Professional & scientific | 2007 |
| Amcor Holding | Professional & scientific | 2001 |
| Amcor Holding 2023 UK Trustee Company Limited | Financial services | 2023 |
| Amcor Holding NO.1 Limited | Professional & scientific | 2001 |
| Amcor International UK PLC | Financial services | 2025 |
| Amcor Investments Germany | Professional & scientific | 2002 |
| Amcor Mediflex Limited | Administrative & support | 1995 |
| Amcor Packaging UK Limited | Manufacturing | 1946 |
| Amcor Polska Holding Limited | Professional & scientific | 2009 |
| Amcor UK Finance PLC | Administrative & support | 2001 |
| Amcor UK Group International Limited | Administrative & support | 1993 |
| Amcor UK Group Management Limited | Professional & scientific | 1967 |
| Amcor UK Investments Limited | Professional & scientific | 1971 |
| Amcor Ventures Ltd | Professional & scientific | 2021 |
| Amcura CIC | Professional & scientific | 2025 |
| AMD Loft Conversions & Construction Limited | Construction | 2014 |
| AMD Solicitors Limited | Professional & scientific | 2003 |
| Amdaris Group Limited | Information & communication | 2016 |
| Amdg II UK Limited | Construction | 2017 |
| Amecom Limited | Information & communication | 2016 |
| Ameenor Limited | Wholesale & retail | 2026 |
| Amelia AEP Ltd | Real estate | 2020 |
| Amelia Enterprises Ltd | Water & waste | 2024 |
| Amelia H3 Limited | Real estate | 2024 |
| Ameliorate Consultancy Ltd | Professional & scientific | 2020 |
| Amema Limited | Information & communication | 2018 |
| AMEN4TEKNO Ltd | Information & communication | 2022 |
| Amenity Weed Management Ltd | Extraterritorial | 2024 |
| Ameo Consulting Ltd | Information & communication | 2015 |
| American R.V.Club Limited | Arts & recreation | 2022 |
| American Recreation Vehicle Club Limited | Extraterritorial | 2022 |
| American Recreational Vehicle Club Limited | Arts & recreation | 2022 |
| American Silk Nails Limited | Other services | 2024 |
| American Sports Boats Ltd | Professional & scientific | 2007 |
| Ameripuff Limited | Wholesale & retail | 2025 |
| Ameroc ERW Ltd | Financial services | 2023 |
| Ames Group Limited | Administrative & support | 2002 |
| Amethyst Connect Ltd | Wholesale & retail | 2016 |
| Amethyst Hill Lodge Limited | Wholesale & retail | 2019 |
| Amethyst Information Systems Limited | Hospitality | 2008 |
| Amethyst Management Limited | Professional & scientific | 1999 |
| Amethyst Marine Services Limited | Energy | 1972 |
| Amethyst Systems Limited | Information & communication | 2008 |
| Ametros Group Ltd | Professional & scientific | 2015 |
| Amex Diner Ltd | Hospitality | 2025 |
| AMF Steel Design Ltd | Professional & scientific | 2011 |
| AMF24 Limited | Professional & scientific | 2026 |
| AMG (QS) Limited | Administrative & support | 2007 |
| AMG Advertising Topco Limited | Professional & scientific | 2006 |
| AMG Pharma Limited | Health & social care | 2016 |
| Amgarmz Limited | Wholesale & retail | 2025 |
| AMH Commercial Projects Ltd. | Construction | 2013 |
| AMH Fish Bar Limited | Hospitality | 2026 |
| AMI Bristol Cleaning Ltd | Administrative & support | 2026 |
| AMI Electrical Contractors Limited | Construction | 2012 |
| AMI Ltd | Financial services | 2026 |