| AM Medical Consulting Ltd | Health & social care | 2015 |
| AM Prolecs Limited | Construction | 2022 |
| AM2 Investments Ltd | Real estate | 2025 |
| Am:Pm Transport Limited | Transport & logistics | 2007 |
| AMA Azizi Properties Limited | Real estate | 2025 |
| Amara Consultancy Limited | Extraterritorial | 2025 |
| Ambas Global Solutions Limited | Wholesale & retail | 2024 |
| AMC Comms Ltd | Information & communication | 2019 |
| Amelia Neagu Ltd | Transport & logistics | 2025 |
| Amen Property Solutions Ltd | Real estate | 2026 |
| American Worldwide Investment Corporation Limited | Administrative & support | 2009 |
| Amezpo Ltd | Arts & recreation | 2024 |
| AMG Heating & Plumbing Limited | Manufacturing | 2011 |
| AMG Transport Services Ltd | Transport & logistics | 2019 |
| AMH Laser and Skin Clinic Ltd | Other services | 2023 |
| Ami's Entertainment Limited | Other services | 2025 |
| Amin Restaurant Ltd | Hospitality | 2017 |
| Amington and District Pre-School Ltd | Education | 2021 |
| Amington Barber Ltd | Other services | 2023 |
| Amington Construction Limited | Construction | 2025 |
| Amington Road (Bolehall) Management Limited | Administrative & support | 2007 |
| Amity Lifestyle Ltd | Professional & scientific | 2025 |
| AMM Events Ltd | Professional & scientific | 2021 |
| Amodal Limited | Professional & scientific | 2020 |
| Amphenol Invotec Limited | Manufacturing | 1986 |
| Amplidyne Limited | Professional & scientific | 2021 |
| Amsteer Sales Limited | Manufacturing | 1974 |
| AN Absolutebyte Limited | Information & communication | 2015 |
| Anara Courier Services Ltd | Transport & logistics | 2024 |
| Anchor MSI (Tamworth) Ltd | Professional & scientific | 2023 |
| AND Electrical Contractors Ltd | Construction | 2017 |
| Andersons Bar and Grill Ltd | Hospitality | 2009 |
| Andrew Barclay Locomotives Limited | Extraterritorial | 2004 |
| Andrew Earl Architectural Limited | Professional & scientific | 2004 |
| Andrew Minifie Limited | Extraterritorial | 2019 |
| Andrew Vaughan Philatelics Limited | Other services | 1998 |
| Andrew White Fencing Limited | Administrative & support | 2006 |
| Andy Starkey Limited | Transport & logistics | 2010 |
| Anker Bridge Nursery Ltd. | Health & social care | 2017 |
| Anker Estates Limited | Other services | 1961 |
| Anker Security Storage Limited | Transport & logistics | 1993 |
| Anker Transport Limited | Transport & logistics | 2017 |
| Anker Van Hire Ltd | Administrative & support | 2017 |
| Anker Vehicle Hire Ltd | Administrative & support | 2022 |
| Anna's Hot TUB Breaks Ltd | Hospitality | 2022 |
| Annddrasales Ltd | Wholesale & retail | 2023 |
| Anofara Properties Limited | Households | 2018 |
| Another Brick in the Wall Limited | Real estate | 2020 |
| Anotomy Ltd | Transport & logistics | 2026 |
| ANP Caroline Ltd | Health & social care | 2022 |
| ANT Burton Window Cleaning Ltd | Administrative & support | 2025 |
| Anytimetyres Tamworth Ltd | Wholesale & retail | 2025 |
| AP Facades Limited | Construction | 2012 |
| AP Workshops Limited | Wholesale & retail | 2019 |
| Aparon Ltd | Professional & scientific | 2016 |
| Apex Tools Trading Limited | Manufacturing | 2010 |
| Apex Tracking Group Ltd | Construction | 2026 |
| Apollo Auto Centre Ltd | Wholesale & retail | 2013 |
| Apollo Car & Commercials Limited | Wholesale & retail | 2026 |
| Apos CUT Ltd | Other services | 2023 |
| Apothecary Aesthetics Ltd | Wholesale & retail | 2017 |
| Applied Vibration Limited | Manufacturing | 1976 |
| Approved Developments Ltd | Construction | 2013 |
| Aprico Limited | Other services | 2015 |
| Aptum Recruitment Consultants Limited | Administrative & support | 2017 |
| Apus (Grendon) Ltd | Construction | 2021 |
| Aquaben Limited | Wholesale & retail | 2021 |
| Aquanauts Swim School Ltd | Arts & recreation | 2015 |
| Aquatic and Emergency Training (AET) Ltd | Education | 2011 |
| Arboury 1 Ltd | Real estate | 2015 |
| Arboury Ltd | Real estate | 2013 |
| Arboury Property Holdings Ltd | Real estate | 2016 |
| Arbury Homes Ltd | Construction | 2019 |
| Arcb Property Development Ltd | Construction | 2018 |
| Arch Commercial Services Limited | Wholesale & retail | 2002 |
| Arch Holdings Limited | Real estate | 2017 |
| Arch Trade Solutions Ltd | Construction | 2011 |
| Archer Building Services Ltd | Construction | 2025 |
| Archer Door Systems Ltd | Manufacturing | 2024 |
| Archer Transport (West Midlands) Limited | Transport & logistics | 1985 |
| Archers Holdings Limited | Financial services | 2023 |
| Architectural Aluminium Coatings Limited | Manufacturing | 2005 |
| Archive Solutions Ltd | Information & communication | 2026 |
| ARD Agency Limited | Professional & scientific | 2017 |
| Arden Biotechnology Limited | Professional & scientific | 2022 |
| Arden Services (UK) Ltd | Professional & scientific | 2003 |
| Arden Surveys Limited | Professional & scientific | 2017 |
| Area Property Group Limited | Real estate | 2024 |
| Arganic Ltd | Wholesale & retail | 2010 |
| Argentum Metal Management Ltd | Professional & scientific | 2013 |
| Aristea Lauren Limited | Wholesale & retail | 2025 |
| Ariston Holdings Ltd | Wholesale & retail | 2021 |
| Ariston Procurement Ltd | Wholesale & retail | 2020 |
| Arkall Barns Management Company Limited | Households | 2011 |
| Arkoz Limited | Transport & logistics | 2017 |
| Armstrong Construction Contracting Ltd | Construction | 2025 |
| Armstrongs Blacksmiths & Engineers Ltd | Manufacturing | 2022 |
| Arnell Properties Holdings Limited | Financial services | 2018 |
| Arnell Properties Limited | Construction | 2018 |
| Arnold Hughes Limited | Manufacturing | 2021 |