| Amaacon Centre for Management and Marketing Education Limited | Professional & scientific | 2007 |
| Amadar Inns Limited | Hospitality | 2023 |
| Amadias Investment Limited | Professional & scientific | 2013 |
| Amados Kommers Ltd | Wholesale & retail | 2022 |
| Amahle Ltd | Professional & scientific | 2018 |
| Amal Food Ltd | Hospitality | 2025 |
| Amalock Limited | Wholesale & retail | 2018 |
| Aman Beauty Limited | Other services | 2024 |
| Amanda Dudman Coaching Services Limited | Professional & scientific | 2008 |
| Amandi Holdings Limited | Information & communication | 2015 |
| Amaretto (Golders Green) Limited | Hospitality | 2016 |
| Amas Accounting Limited | Professional & scientific | 2017 |
| Amaze Finds Ltd | Wholesale & retail | 2025 |
| Amazing Angels Stoke Ltd | Health & social care | 2025 |
| Amazing Care Services Limited | Health & social care | 2018 |
| Amazing Delivery Service Ltd | Transport & logistics | 2021 |
| Amazing Grayzing Limited | Hospitality | 2017 |
| Amazing Health & Beauty Clinic Limited | Professional & scientific | 2015 |
| Amazing Property Ltd | Real estate | 2022 |
| Amazing Savings Limited | Wholesale & retail | 2019 |
| Amazingly Clean Limited | Administrative & support | 2022 |
| Amazingpac Ltd | Wholesale & retail | 2022 |
| Amber Heath Cars Limited | Transport & logistics | 2013 |
| Amber Renovations Ltd | Construction | 2017 |
| Amber Screen and Display Limited | Administrative & support | 2011 |
| Amber Stone Properties Ltd | Real estate | 2021 |
| Amber Team Ltd | Construction | 2024 |
| AMBER247 Ltd | Transport & logistics | 2025 |
| Ambercars Watford Limited | Transport & logistics | 2014 |
| Amberstone Sterling Group Ltd | Real estate | 2024 |
| Amberstone Sterling Holdings Limited | Financial services | 2025 |
| Amberstone Sterling Property Ltd | Real estate | 2025 |
| Ambertree Ltd | Real estate | 2018 |
| Amberville Properties Limited | Construction | 1997 |
| Ambient Training Limited | Information & communication | 2013 |
| Ambigram Limited | Real estate | 2025 |
| Ambivent Developments Limited | Real estate | 1993 |
| Ambivent Group Limited | Professional & scientific | 2016 |
| Ambivent Properties Limited | Professional & scientific | 2016 |
| Ambp Logistics Ltd | Transport & logistics | 2024 |
| Ambrosden Residents Management Company Limited | Real estate | 2025 |
| Ambry Ltd | Manufacturing | 2024 |
| Ambs Investments Ltd | Real estate | 2021 |
| Ambulance Rescue Limited | Health & social care | 2022 |
| Ambush Street Trading Limited | Wholesale & retail | 2023 |
| Amby Digital Ltd | Information & communication | 2020 |
| AMC Electrical (Northants) Ltd | Construction | 2018 |
| AMC Global Trading Ltd | Professional & scientific | 2015 |
| AMC Trans Limited | Transport & logistics | 2026 |
| Amc-It Services Limited | Information & communication | 2024 |
| Amc-It Solutions Limited | Information & communication | 2005 |
| Amca Books Limited | Arts & recreation | 2017 |
| AMD Drylining Ltd | Construction | 2022 |
| AMD Logistics Ltd | Extraterritorial | 2014 |
| AMD Projects Limited | Professional & scientific | 2018 |
| Ameerally Surgery Ltd | Health & social care | 2019 |
| Amelia Jordan Limited | Professional & scientific | 2018 |
| Amelie Homes Ltd | Construction | 2019 |
| Amelija's Bar Restaurant Ltd | Hospitality | 2018 |
| Amend-A-Home UK Ltd | Construction | 2024 |
| Amenities Environmental Limited | Professional & scientific | 2025 |
| Amenities Limited | Water & waste | 2002 |
| Amerc Holdings Ltd | Financial services | 2026 |
| American Driver Ltd | Transport & logistics | 2018 |
| American RV Centre Limited | Manufacturing | 2014 |
| Amersham 10 Renewables Limited | Professional & scientific | 2023 |
| Amethyst Cleaning Ltd | Administrative & support | 2023 |
| Amethyst Purple Limited | Other services | 2009 |
| Amethyst Research Limited | Professional & scientific | 2012 |
| AMF Enterprises Limited | Professional & scientific | 2013 |
| AMF Northampton Ltd | Transport & logistics | 2022 |
| AMF Properties (London) Limited | Real estate | 2023 |
| AMG Care Recruitment Ltd | Health & social care | 2018 |
| AMG Care Training Ltd | Education | 2026 |
| AMG Global Logistics Ltd | Transport & logistics | 2025 |
| AMG Global Trading Ltd | Wholesale & retail | 2022 |
| AMG Homemade Foods Ltd | Hospitality | 2018 |
| AMG Initiatives Ltd | Administrative & support | 2018 |
| AMG Shipping Ltd | Transport & logistics | 2026 |
| AMG Trans Ltd | Transport & logistics | 2019 |
| Amgs Properties Ltd | Real estate | 2025 |
| AMI Freight Ltd | Transport & logistics | 2025 |
| Amic Fest CIC | Administrative & support | 2025 |
| Amica Cafe Ltd | Hospitality | 2025 |
| Amica Care Ltd | Health & social care | 2025 |
| Amicus Projects Ltd. | Other services | 2014 |
| Amin Financial Services Ltd | Professional & scientific | 2019 |
| Amin FX Ltd | Financial services | 2024 |
| Amine's CUT Ltd | Other services | 2024 |
| Amipro Ltd | Wholesale & retail | 2009 |
| Amira Invest Ltd | Manufacturing | 2025 |
| Amista Ltd | Transport & logistics | 2026 |
| Amity College Limited | Administrative & support | 2013 |
| Amjoa Group Ltd | Extraterritorial | 2025 |
| Amjoa Ltd | Financial services | 2025 |
| AMK Lettings Ltd | Real estate | 2021 |
| AML Motorcycles Limited | Wholesale & retail | 2023 |
| Amm&Revolution Limited | Transport & logistics | 2024 |
| Ammann Projects Ltd | Administrative & support | 2016 |
| Ammar Clothing & Textiles Ltd | Wholesale & retail | 2019 |