| Adventure Clubs Ltd | Education | 2005 |
| Adventure Hikes Limited | Education | 2023 |
| Adventuro Ltd | Education | 2022 |
| Aesthetitech Ltd | Wholesale & retail | 2024 |
| AFA Accountancy Limited | Professional & scientific | 1996 |
| Affinitive Asset Group Limited | Professional & scientific | 2019 |
| Africa Driven Ltd | Administrative & support | 2006 |
| AG Funding Limited | Financial services | 2022 |
| AG Referee Ltd | Arts & recreation | 2024 |
| Agere International Ltd | Professional & scientific | 2007 |
| Agile STM Limited | Professional & scientific | 2024 |
| Agricultural Business Analysis Ltd | Administrative & support | 2009 |
| AGS Aviation Retail Ltd | Wholesale & retail | 2025 |
| AH Clinipro Ltd | Public administration | 2021 |
| AH Equine Transport Limited | Administrative & support | 2019 |
| AHA 2025 Ltd | Professional & scientific | 2025 |
| Ahaaa Ltd | Professional & scientific | 2018 |
| Ahad Pound Plus Limited | Wholesale & retail | 2020 |
| AHP Heating & Plumbing Co Ltd | Construction | 2011 |
| Aidali Hair Studio Ltd | Other services | 2022 |
| AIM Installations Ltd | Construction | 2025 |
| Ainsworth Consultancy Ltd | Professional & scientific | 2023 |
| Air Sea Road International Limited | Transport & logistics | 2008 |
| Air Sea Road Shipping & Forwarding Ltd | Transport & logistics | 2010 |
| Airo Agency Ltd | Professional & scientific | 2026 |
| AJM Letting Ltd | Real estate | 2025 |
| Akveris Ltd | Information & communication | 2026 |
| AL Resources Limited | Wholesale & retail | 2002 |
| Alan Finneron Funeral Directors Ltd | Other services | 2004 |
| Alayic Ltd | Information & communication | 2025 |
| Albany Investment Property Limited | Real estate | 2024 |
| Albany Lighting Limited | Manufacturing | 2002 |
| Alberdingk UK Limited | Wholesale & retail | 2023 |
| Alcou Ltd | Professional & scientific | 2023 |
| Alder-Newton Holdings Limited | Financial services | 2023 |
| Alexander Arcoleo Ltd | Arts & recreation | 2020 |
| Alfa Security Service Ltd | Administrative & support | 2023 |
| Alfresco Life Limited | Wholesale & retail | 2006 |
| Alicante Property Limited | Professional & scientific | 2009 |
| Alicante Sun Limited | Professional & scientific | 2020 |
| Alien Swan Investments Ltd | Administrative & support | 2014 |
| Alison Cresswell Consultancy Ltd | Education | 2018 |
| ALL About AV Limited | Administrative & support | 2016 |
| ALL About Events Limited | Extraterritorial | 2013 |
| ALL About Venues Ltd | Administrative & support | 2000 |
| ALL Day Music Ltd | Arts & recreation | 2026 |
| ALL Elements Property Services Limited | Construction | 2019 |
| ALL for ME Ltd | Other services | 2016 |
| ALL OUT in Style Ltd | Arts & recreation | 2021 |
| Allclad Limited | Manufacturing | 2022 |
| Allen Esra Property Cheshire Limited | Households | 2024 |
| Allen Property Investments Ltd | Real estate | 2026 |
| Allen's Pubs Limited | Financial services | 2022 |
| Allied Homes (Cheshire) Ltd | Real estate | 2010 |
| Allman Transport Services Limited | Transport & logistics | 1983 |
| Allmand - Smith Limited | Manufacturing | 1969 |
| Allmand-Smith Group Limited | Financial services | 2025 |
| Allurebooks Ltd | Professional & scientific | 2023 |
| Allways Collective CIC | Wholesale & retail | 2026 |
| Alpha Internet Limited | Information & communication | 2018 |
| Alpont Limited | Professional & scientific | 2012 |
| Alps Legal Practice Limited | Professional & scientific | 2011 |
| Alsager Electrical Ltd | Manufacturing | 2011 |
| Alternatively Healthy London Limited | Arts & recreation | 2015 |
| AM PMB Ltd | Professional & scientific | 2025 |
| Amanda Whiston Events Ltd | Administrative & support | 2023 |
| Amazing Kitchens Ltd | Wholesale & retail | 2026 |
| Amber Business Consultancy Limited | Professional & scientific | 2020 |
| Ambidect Holdings Ltd | Financial services | 2024 |
| Ambidect Limited | Information & communication | 2012 |
| Amery Design Ltd | Information & communication | 2023 |
| Amery's Garage Limited | Wholesale & retail | 1999 |
| AMP Property Management Ltd | Real estate | 2024 |
| Amplifysme Ltd | Professional & scientific | 2025 |
| AMS Industries & Holdings Ltd | Information & communication | 2015 |
| AMS Professional Ltd | Health & social care | 2019 |
| Anchor Care Professionals Ltd | Administrative & support | 2025 |
| Anchora Business Services Limited | Information & communication | 2011 |
| Ancones Limited | Real estate | 2021 |
| Andrew Lewis Associates Limited | Professional & scientific | 2002 |
| Andy Morley Ltd | Professional & scientific | 2011 |
| Andys Roofing Limited | Construction | 2021 |
| Anglesey Fabrication Ltd | Manufacturing | 2003 |
| Anglesey Materials Ltd | Wholesale & retail | 2019 |
| Angry OWL Ltd | Information & communication | 2022 |
| Anoushka Moore Fitness Ltd | Arts & recreation | 2025 |
| Anteron Limited | Professional & scientific | 2014 |
| Anthesis Group Limited | Information & communication | 2019 |
| Anthesis Limited | Information & communication | 2009 |
| Anthesis Product Sales Ltd | Wholesale & retail | 2020 |
| Anthina Limited | Administrative & support | 2024 |
| Anthony Barker Ltd | Extraterritorial | 2025 |
| Anthony Powell Consultancy Ltd | Professional & scientific | 2022 |
| Antrobus Congleton Limited | Real estate | 2020 |
| AP Building and Sons Limited | Construction | 2018 |
| AP Photography Limited | Professional & scientific | 2025 |
| Apex DV Holdings Ltd | Professional & scientific | 2025 |
| Apex Engineering and Construction Ltd | Construction | 2023 |
| Apex Training Solutions Ltd | Education | 2016 |
| APG Displays Limited | Extraterritorial | 2013 |