| Amanda Robinson Consulting Limited | Information & communication | 2018 |
| Amani Consultants Ltd | Professional & scientific | 2021 |
| Amanzi Resources Limited | Financial services | 2012 |
| Amara Lodge Management Company Limited | Real estate | 2008 |
| Amari Power Limited | Manufacturing | 2007 |
| Amarnath Consultants Limited | Professional & scientific | 2021 |
| Amashoppe Limited | Wholesale & retail | 2017 |
| Amatus Skin Ltd | Wholesale & retail | 2020 |
| Amayi Properties Ltd | Real estate | 2025 |
| Amazing People Limited | Information & communication | 2014 |
| Amazon Beauty Ltd | Wholesale & retail | 2021 |
| Ambax Ltd | Wholesale & retail | 2024 |
| Amber Associates IT Training Ltd | Information & communication | 2020 |
| Amber Communications (UK) Ltd | Information & communication | 1995 |
| Ambercycle Limited | Professional & scientific | 2012 |
| Amberley Lodge Care Home Limited | Health & social care | 2006 |
| Ambikaa Meals Ltd | Hospitality | 2025 |
| Ambilee Limited | Transport & logistics | 2026 |
| Ambit Software UK Limited | Information & communication | 2025 |
| Ambitious Rewards Ltd | Information & communication | 2019 |
| Amblecote Homes Limited | Real estate | 2023 |
| Ambleside Apartments Ltd | Real estate | 2021 |
| Ambleworth Limited | Construction | 2019 |
| Ambrosial Services Limited | Health & social care | 2014 |
| Ambur Limited | Information & communication | 2024 |
| AMC Electrical Contractors Limited | Energy | 2008 |
| Amcc Electrical and AOV Systems Ltd | Construction | 2024 |
| Amcm Building & Maintenance Limited | Construction | 2025 |
| AMD Biomedical Consulting Limited | Administrative & support | 2021 |
| Americas Limited | Professional & scientific | 1996 |
| Amerra Limited | Arts & recreation | 1999 |
| Amersham Air Conditioning Limited | Extraterritorial | 2018 |
| Amersham Investment Limited | Real estate | 2016 |
| Amersham Websites Limited | Information & communication | 2009 |
| Amesam Limited | Administrative & support | 2016 |
| Amethyst Residences 26 Ltd | Construction | 2023 |
| Amethyst Residences 27 Limited | Construction | 2024 |
| Amethyst Residences Limited | Construction | 2022 |
| AMF Distribution Limited | Wholesale & retail | 2011 |
| AMG Logistics London Limited | Transport & logistics | 2018 |
| Amica Property Services Limited | Professional & scientific | 2014 |
| Amie Bone Events Limited | Wholesale & retail | 2010 |
| Amie Bone Flowers Ltd | Wholesale & retail | 2010 |
| Amie Bone Funeral Flowers Limited | Wholesale & retail | 2010 |
| Amigos Trading Ltd | Construction | 2016 |
| Amika Group Ltd | Hospitality | 2022 |
| Amika London Ltd | Hospitality | 2022 |
| Amika Watford Ltd | Hospitality | 2022 |
| Amir Power Transmission Limited | Professional & scientific | 1983 |
| Amirah Jewellers Ltd | Wholesale & retail | 2017 |
| Amiraq Automated Retail Limited | Wholesale & retail | 2026 |
| Amiraq Limited | Financial services | 2026 |
| Amit Dixit Design Ltd | Wholesale & retail | 2017 |
| Amit Shah Consulting Services Ltd | Professional & scientific | 2018 |
| Amity Nest Group Limited | Health & social care | 2026 |
| Amity Trade Solutions Limited | Wholesale & retail | 2025 |
| AMJ Properties Ltd | Real estate | 2022 |
| AMK Global Care and Support Ltd | Professional & scientific | 2020 |
| AMK Global Estates Limited | Real estate | 2026 |
| AMK Global Group Ltd | Financial services | 2019 |
| AMK Global Limited | Administrative & support | 2017 |
| AMK Global Properties Ltd | Real estate | 2019 |
| AMK Global Solicitors Ltd | Professional & scientific | 2023 |
| AMK Global Staffing Ltd | Administrative & support | 2024 |
| AMK94 Enterprises Ltd | Information & communication | 2023 |
| AMN Property Company Limited | Other services | 2013 |
| Amniotic Films Ltd | Information & communication | 2019 |
| Amoatentng Company Ltd | Health & social care | 2026 |
| Amooky Ltd | Information & communication | 2023 |
| Amourty Ltd | Administrative & support | 2026 |
| AMP Construction Services Ltd | Construction | 2025 |
| AMP Design Limited | Professional & scientific | 2014 |
| Ampro Consulting Limited | Information & communication | 2013 |
| Ampvolt Electrical Services Ltd | Construction | 2026 |
| AMR Bayoumi Ltd | Professional & scientific | 2023 |
| AMR Consulting Limited | Professional & scientific | 2011 |
| AMR Consulting Services Limited | Professional & scientific | 2018 |
| Amrav Agecare Holdings Ltd | Financial services | 2022 |
| Amrav Talea Ltd | Financial services | 2025 |
| Amreq Ltd | Professional & scientific | 2004 |
| Amrta Limited | Information & communication | 2010 |
| Amrta Property Limited | Real estate | 2016 |
| AMS (South East) Developments Limited | Real estate | 2025 |
| AMS Domestic Ltd | Construction | 2013 |
| Amsa Global Ltd | Real estate | 2017 |
| Amsa Global Property Ltd | Financial services | 2019 |
| Amsano Ltd | Manufacturing | 2015 |
| Amsh Ltd | Wholesale & retail | 2026 |
| Amsons Investments Limited | Real estate | 2025 |
| Amsons Partnership Limited | Real estate | 2019 |
| Amss Investments Limited | Real estate | 2015 |
| Amsuua Limited | Professional & scientific | 2021 |
| AMT Digital Limited | Information & communication | 2018 |
| AMT Vision Ltd | Professional & scientific | 2024 |
| Amuga Limited | Manufacturing | 2023 |
| Amulyaa LLP | | 2025 |
| Amvy Digital Limited | Professional & scientific | 2020 |
| AMW Hydraulic Solutions Ltd | Manufacturing | 2024 |
| Amze&Co Ltd | Wholesale & retail | 2026 |
| Amzgo Ltd | Wholesale & retail | 2020 |