| AMC Construction Services Yorkshire Limited | Construction | 2012 |
| AMC Pharm Ltd | Health & social care | 2026 |
| Amcorp Holdings Ltd | Professional & scientific | 2012 |
| Amcorp Investments Ltd | Construction | 2016 |
| Amcorp Ltd | Real estate | 2012 |
| Amcorp Properties Ltd | Real estate | 2017 |
| AMD Fleet Services Limited | Wholesale & retail | 2024 |
| Amdg Holdings Limited | Other services | 2021 |
| Amedtransport Ltd | Transport & logistics | 2026 |
| Ameed Dharan Matyal CIC | Health & social care | 2026 |
| Ameen Takeaway Ltd | Hospitality | 2019 |
| Amefa GB Ltd | Wholesale & retail | 2020 |
| Amen 12 Properties Ltd | Real estate | 2023 |
| Amen Worldwide Ltd | Wholesale & retail | 2017 |
| Ametalco Limited | Professional & scientific | 1963 |
| Amethyst Dining Ltd | Hospitality | 2021 |
| Ameycroft Developments Ltd | Real estate | 2014 |
| Ameycroft Leisure Ltd | Real estate | 2013 |
| Amfa 786 Ltd | Professional & scientific | 2013 |
| Amfa Legal Ltd | Professional & scientific | 2026 |
| AMG Electrical Engineers Limited | Construction | 2025 |
| AMG Smiles Limited | Health & social care | 2025 |
| Amgr Property Management Limited | Construction | 2018 |
| AMH (SY) Limited | Professional & scientific | 2025 |
| AMH Accountants Limited | Professional & scientific | 2014 |
| AMH Associates Limited | Professional & scientific | 2012 |
| AMH Property Management and Maintenance Limited | Real estate | 2017 |
| AMI Studio Limited | Information & communication | 2025 |
| Amia Clarke Media Ltd | Professional & scientific | 2025 |
| Amicon Solutions Ltd | Information & communication | 2019 |
| Amie Parsons Photography Ltd | Professional & scientific | 2023 |
| Amigos Mexican Kitchen Limited | Hospitality | 2011 |
| Amikal Services Limited | Information & communication | 2019 |
| Amima Limited | Professional & scientific | 2022 |
| Amima Properties Ltd | Real estate | 2023 |
| Amine Skincare Ltd | Wholesale & retail | 2025 |
| Amira Films Limited | Information & communication | 2016 |
| Amis Educational Limited | Education | 2023 |
| Amit Allahabadia Ltd. | Real estate | 2011 |
| Amit Dhamija Limited | Health & social care | 2015 |
| Amity Global Limited | Real estate | 2016 |
| AMJ Electrical Limited | Construction | 2006 |
| AMJ Healthcare Services Ltd | Health & social care | 2016 |
| AMJ2 Limited | Wholesale & retail | 2022 |
| Amjo Investments Ltd | Real estate | 2019 |
| Amjuk Ltd | Manufacturing | 2021 |
| Amkho Consultancy Limited | Professional & scientific | 2024 |
| AML Lettings Limited | Real estate | 2015 |
| AMM Metals Ltd | Wholesale & retail | 2026 |
| Amma World Foods Limited | Wholesale & retail | 2024 |
| Ammaarch Ltd | Wholesale & retail | 2025 |
| Ammy Delux Shop Limited | Wholesale & retail | 2024 |
| Amodo Design Ltd | Professional & scientific | 2022 |
| Amore Vera Care Ltd | Health & social care | 2021 |
| Amos and Jameison Barbering Ltd | Other services | 2023 |
| Amoyewa Ltd | Health & social care | 2017 |
| Amplify Events Live Limited | Administrative & support | 2021 |
| Amplify Mortgages Limited | Financial services | 2023 |
| Amplio Aesthetics Ltd | Wholesale & retail | 2022 |
| Amplisi Limited | Professional & scientific | 2025 |
| Ampmcafe Ltd | Hospitality | 2025 |
| Amptech Electrical Ltd | Manufacturing | 2019 |
| Amrita Nutrition Limited | Extraterritorial | 2021 |
| Amrita Nutrition Topco Limited | Financial services | 2023 |
| Amrtp Ltd | Construction | 2026 |
| Amrun Developments Ltd. | Real estate | 2021 |
| AMS Data Services Limited | Construction | 2016 |
| AMS Electrical Contracting Limited | Construction | 2010 |
| AMS Properties (Sheffield) Limited | Financial services | 2014 |
| Amsz Ltd | Professional & scientific | 2024 |
| AMT Engineering Consultants Ltd | Professional & scientific | 2019 |
| AMT Professional Services Ltd | Professional & scientific | 2024 |
| Amtrack (SW) Limited | Hospitality | 2016 |
| Amusement Caterers (Sheffield) Limited | Arts & recreation | 1964 |
| Amvia Limited | Information & communication | 2016 |
| AMX Personal Training Limited | Arts & recreation | 2021 |
| AMY Claire Ltd | Wholesale & retail | 2023 |
| AMY Friend SET Design Limited | Arts & recreation | 2019 |
| AMY Mcknight & the Modern Score Limited | Information & communication | 2022 |
| AMY Morris Coaching Ltd | Other services | 2023 |
| Amy's House | Administrative & support | 2013 |
| AN1 Holdings Ltd | Professional & scientific | 2025 |
| ANA Estates Ltd | Health & social care | 2021 |
| Anabasis Consulting Limited | Information & communication | 2018 |
| Anaj Building Ltd | Construction | 2022 |
| Analan Supplies Limited | Wholesale & retail | 2002 |
| Analysis of Sport Ltd | Education | 2019 |
| Anarchitect Limited | Professional & scientific | 2013 |
| Anas Noor Ltd | Hospitality | 2026 |
| Anastasia Beauty Limited | Other services | 2018 |
| Anastasia Kingsnorth Holdings Ltd | Financial services | 2026 |
| Anatolia Barber Limited | Other services | 2019 |
| Anatolian Grand Bazaar Ltd | Wholesale & retail | 2023 |
| Anbe Management Services Limited | Construction | 2013 |
| ANC Courier Ltd | Transport & logistics | 2026 |
| Anca Business Consultancy Ltd | Professional & scientific | 2019 |
| Anca Consultants Ltd | Professional & scientific | 2016 |
| Anchor & Dash Limited | Professional & scientific | 2017 |
| Anchor 709 Ltd | Wholesale & retail | 2026 |
| Anchor Commissioning Ltd | Professional & scientific | 2025 |