| Ambleside Facility Services Limited | Transport & logistics | 2020 |
| Ambr.Zi Ltd | Public administration | 2022 |
| Amco Cars Ltd | Wholesale & retail | 2026 |
| Amco Construction NW Ltd | Construction | 2025 |
| Amcom Ltd | Wholesale & retail | 2023 |
| AMD Plugs Ltd | Wholesale & retail | 2019 |
| AME Global Limited | Manufacturing | 2024 |
| Ameena Ltd | Wholesale & retail | 2025 |
| Ameerah Properties Limited | Real estate | 2015 |
| Amelia Rose Delivery and Repairs Limited | Transport & logistics | 2025 |
| Amelia Rose Home Interiors Ltd | Wholesale & retail | 2022 |
| Amer Nazir Management Ltd | Administrative & support | 2003 |
| American Candy N Drinks Ltd | Wholesale & retail | 2026 |
| American Candy World 20 Ltd | Wholesale & retail | 2018 |
| American Confectionery & Vapes Limited | Wholesale & retail | 2026 |
| American Fried Chicken Bolton Ltd | Hospitality | 2026 |
| American GAS Safety (UK) Ltd | Wholesale & retail | 2017 |
| American Sweets & Vapes Ltd | Wholesale & retail | 2025 |
| Amethyst Trading Ltd. | Real estate | 2018 |
| Amex Construction and Developments Limited | Construction | 2024 |
| Amez Mini Market Limited | Wholesale & retail | 2024 |
| Amfz Solutions Ltd | Professional & scientific | 2013 |
| AMG Glass Technology Limited | Construction | 2026 |
| AMG Halal Meats Ltd | Wholesale & retail | 2026 |
| AMG Window Services Limited | Construction | 2024 |
| AMH Air Conditioning Limited | Construction | 2013 |
| AMH Retail Ltd | Wholesale & retail | 2025 |
| AMI Building Construction Ltd | Construction | 2025 |
| AMI Healthcare Ltd | Health & social care | 2023 |
| AMI23 Ltd | Public administration | 2023 |
| Amicii Trading Ltd | Wholesale & retail | 2025 |
| Amicus Consultants Ltd | Professional & scientific | 2024 |
| Amie Louise Skin Clinic Ltd | Other services | 2025 |
| Amie Louise Supplies Ltd | Wholesale & retail | 2024 |
| Amiette Ltd. | Wholesale & retail | 2019 |
| Amigos Barbers Ltd | Other services | 2018 |
| Amigos Foods Ltd | Hospitality | 2024 |
| Amigos Scooter Shop Ltd | Other services | 2024 |
| Amihaas Tech Ltd | Information & communication | 2025 |
| Amiigaf Limited | Financial services | 2024 |
| Amiji Properties Ltd | Real estate | 2026 |
| Amilli Ltd | Health & social care | 2024 |
| Amin Goods Limited | Wholesale & retail | 2026 |
| Amin Investco Limited | Real estate | 2020 |
| Amin& Co Limited | Transport & logistics | 2023 |
| Amir NW Ltd | Real estate | 2019 |
| Amir UK Investments Ltd | Real estate | 2025 |
| Amir UK Limited | Transport & logistics | 2003 |
| Amity Consultants Limited | Professional & scientific | 2006 |
| Amity Law Limited | Professional & scientific | 2005 |
| Amix (Manchester) Limited | Water & waste | 2012 |
| Amix (RMC) Plant Holdings Ltd | Financial services | 2005 |
| Amix RMC Limited | Construction | 2005 |
| AMK Construction Services Ltd | Professional & scientific | 2022 |
| AMK Electronics Ltd | Other services | 2020 |
| AMK Legal Limited | Professional & scientific | 2016 |
| AMK Solutions (UK) Limited | Transport & logistics | 2010 |
| Amkg Consultancy Ltd | Information & communication | 2023 |
| Amla Consulting Services Ltd | Information & communication | 2018 |
| Amla Food Distribution Ltd | Hospitality | 2017 |
| AMM Clinical Services Ltd | Health & social care | 2023 |
| Amma Associates Limited | Health & social care | 2018 |
| Amma Investments Ltd | Real estate | 2018 |
| Ammonite Digital Ltd | Information & communication | 2021 |
| Ammonite Pavilion Ltd | Real estate | 2019 |
| AMN Marketing Ltd | Professional & scientific | 2025 |
| Amneventsdecoration Ltd | Hospitality | 2025 |
| Amod Construction Ltd | Construction | 2026 |
| Amoeba Studios Limited | Administrative & support | 2021 |
| Amola Limited | Health & social care | 2019 |
| Amor Care Group Limited | Health & social care | 2025 |
| Amor Workplace Ltd | Real estate | 2020 |
| Amore Interiors Ltd | Professional & scientific | 2019 |
| Amorie Ltd | Wholesale & retail | 2021 |
| Amotec Limited | Information & communication | 2000 |
| AMP Electrical Mechanical Services Limited | Manufacturing | 1998 |
| Ampex Electricians 24/7 Ltd | Manufacturing | 2023 |
| Ample Sports Ltd | Wholesale & retail | 2024 |
| Amplifix Ltd | Wholesale & retail | 2025 |
| AMR Optix Ltd | Health & social care | 2024 |
| AMR Textiles Limited | Manufacturing | 2001 |
| AMR Wilding Limited | Professional & scientific | 2024 |
| Amraiz & Co. Ltd | Health & social care | 2023 |
| Amrana Limited | Wholesale & retail | 2025 |
| Amrana Transport Limited | Transport & logistics | 2023 |
| Amroham Tech Ltd | Administrative & support | 2018 |
| AMS Business Ventures Ltd | Financial services | 2026 |
| AMS Case Management Limited | Health & social care | 2015 |
| AMS Services Limited | Manufacturing | 2023 |
| Amsd Ltd | Professional & scientific | 2013 |
| Amsellerz Limited | Wholesale & retail | 2025 |
| Amsr Ltd | Professional & scientific | 2015 |
| Amstone Building Limited | Construction | 2015 |
| Amstone Civil Engineering Limited | Construction | 2016 |
| AMT Care & Support Service Ltd | Health & social care | 2025 |
| Amtech (N.W.) Limited | Construction | 1996 |
| Amtinan Ltd | Construction | 2025 |
| Amulet of Ashes Ltd | Wholesale & retail | 2024 |
| AMW Inspection Ltd | Professional & scientific | 2012 |
| Amyjoe UK Ltd | Wholesale & retail | 2017 |