| Amba Care Solutions Community Interest Company | Health & social care | 2015 |
| Amba Family Homes Ltd | Real estate | 2024 |
| Amba Recruitment Solutions Ltd | Administrative & support | 2026 |
| Ambarsari Chaska Ltd | Hospitality | 2025 |
| Ambassador Cars (UK) Limited | Transport & logistics | 2000 |
| Ambassador Contract Services Limited | Administrative & support | 2004 |
| Ambassador Midlands Ltd | Transport & logistics | 2023 |
| Ambassadors Resourcing Limited | Administrative & support | 2006 |
| Ambastic Ltd | Manufacturing | 2026 |
| Amber & Marble Limited | Real estate | 2024 |
| Amber Accident Claims Ltd | Administrative & support | 2008 |
| Amber Collections Ltd | Wholesale & retail | 2007 |
| Amber Digweed Corporation Limited | Information & communication | 2016 |
| Amber Fire & Electrical Services Ltd | Construction | 2025 |
| Amber Food Machinery Limited | Administrative & support | 2015 |
| Amber Media (2007) Ltd | Information & communication | 2007 |
| Amber Properties Inc Ltd | Hospitality | 2012 |
| Amber Properties One Limited | Hospitality | 2022 |
| Amber Publications & Training Limited | Education | 2008 |
| Amber Publications and Training LLP | | 2006 |
| Amber Real Estate Investments (Agriculture) Limited | Real estate | 2015 |
| Amber Real Estate Investments (Industrial) Limited | Real estate | 2015 |
| Amber REI Green Energy Limited | Energy | 2011 |
| Amber REI Holdings Limited | Real estate | 2010 |
| Amber Residential (Birmingham) Limited | Real estate | 2006 |
| Amber Residential Properties Holdings Limited | Financial services | 2024 |
| Amber Residential Properties Limited | Real estate | 2010 |
| Amber Services UK Limited | Professional & scientific | 2002 |
| Amber Slate Ltd | Information & communication | 2023 |
| Amber Supported Housing C.I.C. | Health & social care | 2018 |
| Amber Valley Housing Limited | Hospitality | 2012 |
| Amberbrook Limited | Health & social care | 1991 |
| Amberlec Limited | Construction | 2007 |
| Amberman Limited | Administrative & support | 2005 |
| Ambersouk Limited | Wholesale & retail | 2014 |
| Ambersradiantskinboutique Limited | Other services | 2025 |
| Ambhar Limited | Other services | 2024 |
| Ambi & Co (UK) Ltd | Wholesale & retail | 2013 |
| Ambiance Wood House Ltd | Administrative & support | 2020 |
| Ambiente Commerce LP | | 2015 |
| Ambiente Lounge Ltd | Hospitality | 2022 |
| Ambika News Ltd. | Wholesale & retail | 2016 |
| Ambika Technologies Limited | Wholesale & retail | 2013 |
| Ambinet Software Ltd | Information & communication | 2020 |
| Ambir Ltd | Construction | 2024 |
| Ambirmingham Ltd | Hospitality | 2026 |
| Ambition Consultancy Ltd | Professional & scientific | 2024 |
| Ambition Housing Ltd | Real estate | 2025 |
| Ambitions Property Ltd | Real estate | 2026 |
| Ambitious Aspirations Limited | Information & communication | 2023 |
| Ambitiousrat Designs Limited | Wholesale & retail | 2015 |
| Ambla Market Ltd | Wholesale & retail | 2025 |
| Amblecoat Car Centre Ltd | Wholesale & retail | 2018 |
| Ambleside 1976 Limited | Professional & scientific | 2021 |
| Ambleside Fish Bar Worcester Ltd | Hospitality | 2023 |
| Ambleydale Limited | Real estate | 1979 |
| Ambr Living Group Ltd | Real estate | 2026 |
| Ambracia Holdings Ltd | Real estate | 2023 |
| Ambracia Properties Ltd | Real estate | 2026 |
| Ambrell Limited | Wholesale & retail | 2004 |
| Ambridge Fields Management Company Limited | Households | 2026 |
| Ambrose Mildred Shayaam Smith Land Company Ltd | Real estate | 2025 |
| Ambrosial Nutrifood Ltd | Wholesale & retail | 2021 |
| AMC 99 Limited | Financial services | 2020 |
| AMC Car Sales Limited | Wholesale & retail | 2021 |
| AMC Elstree Limited | Hospitality | 2023 |
| AMC Photographics Limited | Professional & scientific | 2012 |
| AMC Training 4 Change Ltd | Administrative & support | 2022 |
| AMC WM Ltd | Wholesale & retail | 2021 |
| Amcez Limited | Real estate | 2026 |
| Amci Associates Ltd | Professional & scientific | 2003 |
| Amci Consulting Limited | Professional & scientific | 2021 |
| Amci Estates Ltd | Real estate | 2017 |
| Amci Global Limited | Information & communication | 2021 |
| Amci Ltd | Real estate | 2014 |
| Amci Management Services Limited | Professional & scientific | 2017 |
| Amci Projects Ltd | Professional & scientific | 2019 |
| Amci Sports Limited | Manufacturing | 2026 |
| Amciv Ltd | Professional & scientific | 2019 |
| Amclinical Limited | Health & social care | 2019 |
| Amcom Ltd UK Ltd | Professional & scientific | 2023 |
| Amcv Real Estate Ltd | Real estate | 2017 |
| AMD Civils Ltd | Administrative & support | 2021 |
| AMD Consultant Ltd | Transport & logistics | 2023 |
| AMD Dent Ltd | Health & social care | 2026 |
| AMD Food Services Limited | Wholesale & retail | 2026 |
| AMD Furniture Ltd | Wholesale & retail | 2022 |
| AMD Practice Limited | Health & social care | 2016 |
| AMD Supported Living Ltd | Real estate | 2026 |
| Amdh Ltd | Professional & scientific | 2018 |
| AME Cafe Holdings Ltd | Hospitality | 2022 |
| AME Chopper Limited | Administrative & support | 2004 |
| AME Consultancy Limited | Health & social care | 2025 |
| AME Investments Ltd | Real estate | 2024 |
| Ameejamz Treatz Ltd | Hospitality | 2023 |
| Ameen Construction Limited | Construction | 2025 |
| Ameen UK Jewellers Ltd | Wholesale & retail | 2025 |
| Ameena Azad Ltd | Health & social care | 2022 |
| Ameenia Sultania Educational Trust | Education | 2010 |
| Ameir Brown Ltd | Arts & recreation | 2023 |