| American Candy Midlands Limited | Wholesale & retail | 2024 |
| American Fried Chicken Leicester Limited | Hospitality | 2021 |
| American Nails (Leicester) Limited | Other services | 2015 |
| Ames Properties Ltd | Real estate | 2017 |
| Amesbury Court Management (Leicester) Limited | Households | 1982 |
| Ametek (GB) Limited | Manufacturing | 1990 |
| Ametek Aerospace and Defense Group UK Limited | Professional & scientific | 2012 |
| Ametek Airtechnology Group Limited | Manufacturing | 1951 |
| Ametek Crystal Power Limited | Financial services | 2025 |
| Ametek European Holdings Limited | Professional & scientific | 2010 |
| Ametek Global Limited | Professional & scientific | 2022 |
| Ametek Instruments Group UK Limited | Professional & scientific | 2012 |
| Ametek International Limited | Professional & scientific | 2022 |
| Ametek SCP (Barrow) Limited | Administrative & support | 2005 |
| Ametek UK Finance Limited | Professional & scientific | 2021 |
| Amethyst Insurance Brokers Limited | Financial services | 2023 |
| Amethyst Properties Leicester Limited | Real estate | 2014 |
| Amey Homes Ltd | Construction | 2013 |
| Amez Boutique Ltd | Wholesale & retail | 2021 |
| Amfaah Investments Ltd | Construction | 2010 |
| Amfaah Small Kindness | Health & social care | 2018 |
| AMG Builders Limited | Construction | 2021 |
| AMG Controls & Automation Ltd | Professional & scientific | 2023 |
| AMG Plumbing & Heating Services Ltd | Construction | 2021 |
| AMH Assets Ltd | Real estate | 2022 |
| AMH Courier Limited | Transport & logistics | 2024 |
| AMH Investments One Limited | Real estate | 2025 |
| AMH Stores Ltd | Wholesale & retail | 2023 |
| Amha Leicester Ltd | Real estate | 2021 |
| Amhar Ltd | Financial services | 2025 |
| Amhbz Limited | Wholesale & retail | 2025 |
| AMI NN Ltd | Real estate | 2024 |
| Amibiz Limited | Wholesale & retail | 2017 |
| Amic Studios Ltd | Other services | 2025 |
| Amica Legal Services Limited | Professional & scientific | 2025 |
| Amica Systems UK Ltd | Wholesale & retail | 2021 |
| Amical Leicester CIC | Health & social care | 2025 |
| Amicare Domiciliary Care Services Ltd | Health & social care | 2007 |
| Amicare Solar Limited | Energy | 2022 |
| Amico Packaging (Leicester) Ltd | Administrative & support | 2012 |
| Amicus Health Ltd | Health & social care | 2024 |
| Amiira Cafe Limited | Hospitality | 2022 |
| Amijoe Ltd | Health & social care | 2024 |
| Amin & Sons Ltd | Wholesale & retail | 2021 |
| Amin Butchery Leics Ltd | Wholesale & retail | 2020 |
| Aminata Creative Ltd | Other services | 2023 |
| Amink Ltd | Health & social care | 2022 |
| Amir Capital Assets Ltd | Real estate | 2023 |
| Amirro Ltd | Wholesale & retail | 2025 |
| Amis Sky Group Ltd | Real estate | 2018 |
| Amish Trading Ltd | Wholesale & retail | 2024 |
| Amisha & Co Ltd | Health & social care | 2004 |
| Amison Properties Ltd | Real estate | 2017 |
| Amison Wellbeing Services Ltd | Health & social care | 2021 |
| Amison Wellbeing SPR Ltd | Health & social care | 2024 |
| Amit Kanabar Ltd | Real estate | 2016 |
| Amiyah Investments Ltd | Financial services | 2022 |
| AMJ Singh Limited | Transport & logistics | 2020 |
| Amjara Ltd | Wholesale & retail | 2023 |
| AMK Accessories Ltd | Wholesale & retail | 2024 |
| AMK Developers Ltd | Professional & scientific | 2012 |
| Amks Retail Ltd | Wholesale & retail | 2022 |
| AML Stores Ltd | Wholesale & retail | 2023 |
| AML Travel and Tours Ltd | Administrative & support | 2025 |
| Amli Design Ltd | Professional & scientific | 2019 |
| AMM Surveying Services Limited | Professional & scientific | 2017 |
| AMM30 Limited | Health & social care | 2023 |
| Amma Care Ltd | Health & social care | 2024 |
| Ammah Ltd | Health & social care | 2020 |
| Amman Investments Limited | Real estate | 2019 |
| Ammar Ahmed Junaid General Contracting Ltd | Construction | 2025 |
| Ammara M Ltd | Health & social care | 2024 |
| Ammarah Ltd | Transport & logistics | 2019 |
| Ammaraonline Limited | Wholesale & retail | 2025 |
| Ammarasdt Ltd | Health & social care | 2023 |
| Ammart Ltd | Wholesale & retail | 2018 |
| Amms Solutions Limited | Professional & scientific | 2019 |
| Amnahg Locum Ltd | Health & social care | 2014 |
| Amnec Limited | Administrative & support | 2014 |
| AMO LA Moda Ltd | Other services | 2015 |
| Amoli Property Solutions Ltd | Households | 2021 |
| Amolty Ltd | Health & social care | 2022 |
| Amor DE Brand Ltd | Wholesale & retail | 2022 |
| Amore & Co Events Ltd | Arts & recreation | 2023 |
| Amore Skin Beauty Aesthetics Ltd | Other services | 2023 |
| Amorette Camillia Ltd | Wholesale & retail | 2021 |
| Amorvia Ltd | Other services | 2025 |
| Amos Mann Furniture Ltd | Wholesale & retail | 2017 |
| Amour Clothing Ltd | Manufacturing | 2019 |
| Amour Designhouse Limited | Hospitality | 2019 |
| Amour Estates Ltd | Real estate | 2026 |
| Amoura Dessert Ltd | Hospitality | 2026 |
| Amoura Food Ltd | Hospitality | 2025 |
| Amoura Group Ltd | Hospitality | 2023 |
| Amoura Lounge Ltd | Hospitality | 2022 |
| Amoy Ltd | Hospitality | 2023 |
| Amozgan International Ltd | Wholesale & retail | 2026 |
| AMP Electrical Services (Leics) Ltd | Construction | 2026 |
| AMP Fire Ltd | Public administration | 2017 |
| AMP Smile Limited | Health & social care | 2024 |