| Altitude Property Group Ltd | Real estate | 2023 |
| Alton Valley Limited | Information & communication | 2009 |
| Altravita Health Ltd | Administrative & support | 2022 |
| Alvaston Achievers Day Nursery Limited | Health & social care | 2017 |
| Alvaston Curry House Ltd | Hospitality | 2023 |
| Alvaston Fish Bar Limited | Hospitality | 2018 |
| Alvaston Kebabs Ltd | Administrative & support | 2017 |
| Alvaston MOT & Service Centre Limited | Wholesale & retail | 2016 |
| Alvaston News Limited | Wholesale & retail | 2020 |
| Alvaston Site Services Ltd | Construction | 2016 |
| Alvaston Takeaway Ltd | Hospitality | 2023 |
| Alvechurch Heating & Plumbing Services Limited | Energy | 1973 |
| Alverprise Limited | Professional & scientific | 1996 |
| Alvo Services Ltd | Manufacturing | 2022 |
| Always Welcome Limited | Administrative & support | 2016 |
| AM 76 Limited | Professional & scientific | 2019 |
| AM Clinic Laser & Skin Ltd | Health & social care | 2021 |
| AM Logistics Services Limited | Transport & logistics | 2025 |
| AM Textiles Limited | Wholesale & retail | 2019 |
| AM2PM Security Systems Limited | Administrative & support | 2003 |
| AMA Derby Limited | Real estate | 2024 |
| AMA Solutions Ltd | Hospitality | 2020 |
| AMA UK Transport Ltd | Transport & logistics | 2017 |
| Amaan's Property Limited | Real estate | 2022 |
| Amacom Distribution Ltd | Transport & logistics | 2017 |
| Amadeus Holdings Limited | Real estate | 2024 |
| Amajesence Ltd | Real estate | 2025 |
| Amaku & Sons Ltd | Transport & logistics | 2018 |
| Amalfi White Limited | Hospitality | 2011 |
| Aman's Taxis Ltd | Transport & logistics | 2024 |
| Amanah Financial Limited | Financial services | 2025 |
| Amanda Gordon Limited | Financial services | 2007 |
| Amanda Jayne Education Limited | Arts & recreation | 2011 |
| Amanda Mellor Limited | Professional & scientific | 2013 |
| Amans Builders Ltd | Construction | 2026 |
| Amans Construction Ltd | Construction | 2024 |
| Amante Aesthetics and Wellness Ltd | Other services | 2025 |
| Amar Transport Derby Ltd | Transport & logistics | 2025 |
| Amaral Ltd | Professional & scientific | 2018 |
| Amari Derby Ltd | Financial services | 2026 |
| Amari Locum UK Limited | Health & social care | 2011 |
| Amars Co Trading Ltd | Wholesale & retail | 2017 |
| Amateur Pros Club Ltd | Wholesale & retail | 2024 |
| Amath Logistics Ltd | Transport & logistics | 2025 |
| Amatt Developments Ltd | Real estate | 2021 |
| Amaya Technology Ltd | Information & communication | 2023 |
| Amaze ME Furniture Ltd | Wholesale & retail | 2025 |
| Amazing Mealz Ltd | Hospitality | 2024 |
| Amazoner Pros Limited | Professional & scientific | 2023 |
| AMB Mortgage Solutions Ltd | Financial services | 2011 |
| AMB Security Group Ltd | Administrative & support | 2026 |
| Ambarsar Limited | Health & social care | 2026 |
| Amber Care Services Ltd | Health & social care | 2022 |
| Amber Contract Services Limited | Construction | 1992 |
| Amber Guest House Ltd | Hospitality | 2023 |
| Amber Haulage Ltd | Transport & logistics | 2026 |
| Amber Homes Sales & Lettings Ltd | Real estate | 2012 |
| Amber House (Derby) Management Company Limited | Real estate | 2017 |
| Amber House Developments Limited | Construction | 2017 |
| Amber Law Limited | Professional & scientific | 2010 |
| Amber Projects 2012 Limited | Construction | 2012 |
| Amber Property Management Services Limited | Households | 2020 |
| Amber Valley and Erewash Athletic Club | Arts & recreation | 2020 |
| Amber Valley Interiors Limited | Construction | 2014 |
| Amber Valley Tree Care Ltd | Administrative & support | 2021 |
| Amberley Capital Limited | Financial services | 2020 |
| Ambro Wilson Limited | Extraterritorial | 2021 |
| AMC Training & Consultancy Limited | Professional & scientific | 2014 |
| Amdd Food Limited | Hospitality | 2022 |
| Amelia Grace Properties Ltd | Real estate | 2025 |
| Amen African Store Ltd | Wholesale & retail | 2025 |
| Amena Qadiri Podiatry Limited | Health & social care | 2026 |
| Ames Performance Ltd | Education | 2025 |
| Ametha Limited | Real estate | 2021 |
| Amethyst Consulting Ltd. | Information & communication | 2016 |
| Amethyst Ltd | Real estate | 2024 |
| AMF Logistics Ltd | Transport & logistics | 2024 |
| Amfitritis Ltd | Real estate | 2019 |
| Amfrad (Property) Limited | Real estate | 2019 |
| Amfrad Ltd | Administrative & support | 2016 |
| AMG Active Motor Group Ltd | Wholesale & retail | 2025 |
| AMG Roofing Services Limited | Construction | 2005 |
| AMG Shooting Academy Limited | Arts & recreation | 2023 |
| AMG Wealth Holdings Limited | Financial services | 2010 |
| AMG Wealth Management Ltd | Financial services | 2021 |
| Amgent Ltd | Professional & scientific | 2020 |
| Amicus Properties Limited | Real estate | 2003 |
| Amigo Golf Ltd | Manufacturing | 2025 |
| Amilia.Co Ltd | Administrative & support | 2014 |
| Amir Empire Ltd | Wholesale & retail | 2025 |
| AMJ Biomedical Sciences Limited | Information & communication | 2019 |
| AMJ424 Limited | Real estate | 2024 |
| Amjid Butler Ltd | Health & social care | 2024 |
| AMK Enterprises London Limited | Wholesale & retail | 2013 |
| AML (Midlands) Ltd | Information & communication | 2005 |
| Amld Limited | Transport & logistics | 2020 |
| Ammara Commercial Consulting Ltd | Professional & scientific | 2013 |
| Ammark Logistics Ltd | Transport & logistics | 2022 |
| Ammi’S Biryani Limited | Hospitality | 2025 |
| Amnc Property Ltd | Real estate | 2023 |