| AMJ Enterprises Ltd | Education | 2002 |
| AMJ Services (Midlands) Limited | Health & social care | 2007 |
| AMJADKHAN786 Limited | Transport & logistics | 2023 |
| Amjeer Ltd | Transport & logistics | 2024 |
| Amkk School Limited | Arts & recreation | 2022 |
| Amlitious Ltd | Transport & logistics | 2024 |
| Amlock Construction Limited | Construction | 2014 |
| Ammaar a Ltd | Real estate | 2024 |
| Amore Media Systems Ltd | Information & communication | 2024 |
| Amouage Kettering Ltd | Hospitality | 2020 |
| AMP Electrical Wholesalers (West Midlands) Limited | Wholesale & retail | 2010 |
| Amped Electrics Limited | Construction | 2020 |
| Ampimear Ltd | Transport & logistics | 2024 |
| Ample Mart Ltd | Wholesale & retail | 2024 |
| Ample Technology Ltd | Wholesale & retail | 2024 |
| Amplelime Healthcare Limited | Health & social care | 2016 |
| Amplify Psychology Ltd | Education | 2023 |
| Amrl Limited | Wholesale & retail | 2014 |
| Amru Consulting Limited | Professional & scientific | 2019 |
| Amru Property Limited | Real estate | 2023 |
| AMS Haulage Ltd | Transport & logistics | 2021 |
| Amtella Limited | Construction | 1999 |
| Amtrak Limited | Extraterritorial | 2007 |
| AMW Light Engineering Ltd | Manufacturing | 2020 |
| AMY Rose Consultancy Limited | Professional & scientific | 2026 |
| AN EYE Care Ltd | Health & social care | 2018 |
| AN Homeway Limited | Real estate | 2024 |
| AN Traders Ltd | Wholesale & retail | 2021 |
| Anaheim Transport Limited | Transport & logistics | 1964 |
| Analytics Consulting Services Limited | Professional & scientific | 2024 |
| Anand Associates Limited | Professional & scientific | 2019 |
| Anavira Global Ltd | Wholesale & retail | 2026 |
| Anchor Batteries Ltd | Wholesale & retail | 2026 |
| Anchor Care Group Ltd | Health & social care | 2025 |
| Anchor Cars (Aldridge) Ltd | Transport & logistics | 2019 |
| Anchor Housing and Support Limited | Public administration | 2018 |
| Anchor Meadow Management Limited | Administrative & support | 2009 |
| Anchor Rentals Ltd | Real estate | 2026 |
| Anchor Wines Limited | Wholesale & retail | 2014 |
| Anchor Wines Properties Limited | Real estate | 2025 |
| Anchortech Limited | Wholesale & retail | 2019 |
| Anchortoken (1985) Limited | Construction | 1985 |
| Ancol Pet Products Holdings Limited | Professional & scientific | 2008 |
| AND ALL That Ltd | Professional & scientific | 2019 |
| AND Union Limited | Wholesale & retail | 2010 |
| Andpac Transport Limited | Transport & logistics | 2014 |
| Andreea Medicine Star Lips Limited | Other services | 2024 |
| Andrei Chef Ltd | Hospitality | 2022 |
| Andres Trans Ltd | Transport & logistics | 2016 |
| Andrew Terence Limited | Wholesale & retail | 2021 |
| Andrew Walsh Funeral Directors Limited | Health & social care | 2004 |
| Andrew Wommack Ministries - Europe | Other services | 2008 |
| Andrews Legal and Real Estate Consultants Limited | Real estate | 2023 |
| Andrey Car Limited | Wholesale & retail | 2020 |
| Andrey Trans Ltd | Wholesale & retail | 2012 |
| Andriel Last Stop Care Limited | Health & social care | 2024 |
| Andritz Schuler Presses UK Limited | Manufacturing | 1999 |
| Andy & Effie Takeaway Ltd | Hospitality | 2018 |
| Andy Smith Associates Limited | Professional & scientific | 2013 |
| Aneece Works Limited | Transport & logistics | 2014 |
| Angel Croft Developments Limited | Construction | 2019 |
| Angel Croft Hotel Limited | Real estate | 2019 |
| Angel Oak Preschool Ltd | Arts & recreation | 2022 |
| Angel Solar Systems Limited | Construction | 2025 |
| Angel TEE Ltd | Hospitality | 2021 |
| Angelite Care Solutions Ltd | Health & social care | 2025 |
| Angels and Butterflies Childminding Ltd | Health & social care | 2019 |
| Angels Construction Services Ltd | Construction | 2025 |
| Angels of Tamworth Ltd | Wholesale & retail | 2014 |
| Angels Treasureland Care Services Limited | Health & social care | 2015 |
| Anglo Asian Company Limited | Manufacturing | 1988 |
| Anglo Scientific Ltd | Professional & scientific | 2000 |
| Anglo Swiss Trading Limited | Wholesale & retail | 2023 |
| Animus VOX Ltd | Health & social care | 2025 |
| Anis's Ltd | Manufacturing | 2016 |
| Anisa-Im Limited | Information & communication | 2012 |
| Anisha Technical Services Limited | Information & communication | 2016 |
| Anjani Group Ltd | Wholesale & retail | 2022 |
| Ankish Catering Limited Limited | Hospitality | 2024 |
| Anmani Ltd | Transport & logistics | 2024 |
| Ann-Martin International Limited | Transport & logistics | 2002 |
| Anna Goodwin Accountancy Limited | Professional & scientific | 2012 |
| Anna R Ltd | Wholesale & retail | 2019 |
| Anna Transport Limited | Transport & logistics | 2012 |
| Anna-Sleep Ltd | Wholesale & retail | 2024 |
| Annefield House Ltd | Health & social care | 2008 |
| Anniem Investments Limited | Financial services | 2017 |
| Annsalat UK Limited | Wholesale & retail | 2025 |
| Anointed Apparel Ltd | Wholesale & retail | 2026 |
| Anpbld Ltd | Construction | 2025 |
| ANR Transport Ltd | Transport & logistics | 2015 |
| ANS Property Holdings Limited | Financial services | 2024 |
| ANS Sapphire Limited | Real estate | 2017 |
| Ansa UK Limited | Construction | 1998 |
| Ansel Monarchy Ltd | Wholesale & retail | 2023 |
| Antalya Kebab and Pizza Ltd | Hospitality | 2019 |
| Antclaire Limited | Financial services | 2015 |
| Anthem Homes Limited | Construction | 2017 |
| Anthill Mews Ltd | Information & communication | 2019 |
| Anthonies Limited | Real estate | 2014 |