| AM Pinpoint Properties Ltd | Real estate | 2024 |
| AM Properties Nottingham Ltd | Real estate | 2023 |
| AM Social Work Assessments Ltd | Health & social care | 2026 |
| AM Taylor Building Contractors Limited | Construction | 2012 |
| AM Wood Craft Ltd | Manufacturing | 2020 |
| Am-Am's House Limited | Health & social care | 2024 |
| AM4 Properties Ltd | Real estate | 2025 |
| Amaal Properties Ltd | Real estate | 2025 |
| Amaar Enterprises Ltd | Wholesale & retail | 2024 |
| Amajas Ltd | Financial services | 2024 |
| Amakamedic Ltd | Health & social care | 2020 |
| Amal Solutions Ltd | Professional & scientific | 2019 |
| Amalfi Bistro Limited | Hospitality | 2024 |
| Amalfi BLU Ltd | Wholesale & retail | 2025 |
| Amalgamated Holdings Wilkinson Limited | Financial services | 2017 |
| Amalgamated Smart Metering Limited | Energy | 2014 |
| Aman Lidder Coaching Limited | Professional & scientific | 2025 |
| Aman Property Ltd | Real estate | 2024 |
| Amanah Lettings Ltd | Real estate | 2025 |
| Amanah Oils Co Ltd | Manufacturing | 2026 |
| Amanda Bains Consultant Ltd | Extraterritorial | 2016 |
| Amanda Gilbert Associates Ltd | Professional & scientific | 2023 |
| Amanda Jane Homes Ltd | Real estate | 2019 |
| Amanee Ltd | Health & social care | 2022 |
| Amaooh Ltd | Wholesale & retail | 2025 |
| Amara Ultrasound Ltd | Health & social care | 2025 |
| Amaranthus Management Limited | Households | 2013 |
| Amari Rose Properties Ltd | Real estate | 2020 |
| Amari's Universe Health & Fitness Limited | Administrative & support | 2016 |
| Amaris Property Limited | Real estate | 2021 |
| AMARONE2 Ltd | Hospitality | 2026 |
| Amax Roofing Ltd | Construction | 2025 |
| Amazing Brit Quality Ltd | Wholesale & retail | 2026 |
| Amazing Days 2 LLP | | 2020 |
| Amazing Days Limited | Administrative & support | 2019 |
| Amazing Spaces Renovations Ltd | Construction | 2024 |
| AMB Asset Management Ltd | Households | 2024 |
| AMB HO Ltd | Administrative & support | 2025 |
| AMB Paye Ltd | Administrative & support | 2025 |
| AMB Payroll Limited | Administrative & support | 2026 |
| AMB Traders Ltd | Wholesale & retail | 2024 |
| Ambar Textiles Limited | Wholesale & retail | 1997 |
| Ambaraxer Ltd | Wholesale & retail | 2020 |
| Ambartex Limited | Manufacturing | 2016 |
| Amber Composites Limited | Extraterritorial | 2013 |
| Amber Drinks Consultants Ltd | Professional & scientific | 2016 |
| Amber Lane Farm Estates Limited | Hospitality | 2025 |
| Amber LEA Developments Limited | Real estate | 2009 |
| Amber Panels and Enclosures Ltd | Administrative & support | 2016 |
| Amber Point Limited | Administrative & support | 2022 |
| Amber Property Group Limited | Real estate | 2022 |
| Amber Richardson Limited | Other services | 2022 |
| Amber Solutions Ltd | Information & communication | 2013 |
| Amber Technical Limited | Manufacturing | 2002 |
| Amber Valley Riders | Health & social care | 2000 |
| Ambercloud Solutions Ltd | Information & communication | 2017 |
| Ambercorn Limited | Real estate | 1998 |
| Ambergate Supplies Limited | Wholesale & retail | 2024 |
| Amberglazing Limited | Construction | 2021 |
| Amberley Nottingham Properties Limited | Real estate | 2010 |
| Amberlight Properties Limited | Real estate | 2020 |
| Amberquay Limited | Real estate | 2001 |
| Ambersand Consulting Limited | Professional & scientific | 2026 |
| Ambience Response Limited | Construction | 2009 |
| Ambient Lounge Limited | Wholesale & retail | 2005 |
| Ambiguousambigrams Ltd | Information & communication | 2023 |
| Ambir and Sons Ltd | Wholesale & retail | 2025 |
| Ambition Management Holdings Limited | Professional & scientific | 1999 |
| Ambition Management Limited | Arts & recreation | 1999 |
| Ambition Tuition Ltd | Education | 2022 |
| Ambitions First Care Ltd | Health & social care | 2025 |
| Ambitions First Education Ltd | Education | 2025 |
| Ambitions First Group Ltd | Financial services | 2025 |
| Ambitious Futures Limited | Professional & scientific | 2015 |
| Ambleside Management (Hucknall) Ltd | Real estate | 2014 |
| AMBO4SERVICES Limited | Health & social care | 2018 |
| Ambody Ltd | Manufacturing | 2024 |
| AMC Developments (UK) Limited | Construction | 2013 |
| AMC Distribution Limited | Transport & logistics | 2002 |
| AMC IT Group Limited | Financial services | 2020 |
| AMC Motor Centre Ltd | Wholesale & retail | 2025 |
| Amco Logistics Limited | Extraterritorial | 2013 |
| Amdai Limited | Wholesale & retail | 2010 |
| AME Rouk Trans Limited | Other services | 2020 |
| Ameer Traders Ltd | Wholesale & retail | 2025 |
| Ameera’S Bucket Ltd | Wholesale & retail | 2025 |
| Ameeta Boyal Limited | Health & social care | 2018 |
| Amegreen Complex Homecare Limited | Health & social care | 2012 |
| Amelia House Management Company Limited | Households | 2023 |
| Amelie Rose Gift Co Ltd | Manufacturing | 2024 |
| Amen Transport UK Ltd. | Wholesale & retail | 2018 |
| Ameresca Ltd | Other services | 2022 |
| Americandelight Ltd | Wholesale & retail | 2024 |
| Americom 24 Limited | Manufacturing | 2020 |
| Ameropak Business Group Limited | Wholesale & retail | 2022 |
| Amet Homes Limited | Real estate | 2014 |
| Amethyst Wealth Limited | Financial services | 2026 |
| AMF Inc. Ltd | Extraterritorial | 2017 |
| AMF Retail Ltd | Hospitality | 2020 |
| AMG Fabrications Limited | Manufacturing | 2015 |