| Agile Edge Limited | Information & communication | 2021 |
| AGT Trading Ltd | Wholesale & retail | 2023 |
| AH Engineering Consulting Services Limited | Professional & scientific | 2011 |
| AH IMP Services Ltd | Professional & scientific | 2017 |
| Ahsheet Limited | Information & communication | 2025 |
| Ahshini Jeyaraj Ltd | Wholesale & retail | 2020 |
| Ahstreamline Limited | Information & communication | 2025 |
| AI Digital Connect Limited | Administrative & support | 1998 |
| AI Digital Media Limited | Information & communication | 2024 |
| AI Fork Ltd | Information & communication | 2025 |
| AI Seed 2 Nominees Ltd | Financial services | 2019 |
| Aigeniq Limited | Information & communication | 2025 |
| Ailse Oncology Ltd. | Professional & scientific | 2015 |
| AIM Collaborations Limited | Other services | 2024 |
| AIM Leisure Limited | Other services | 2018 |
| Aimeeandfred Limited | Wholesale & retail | 2023 |
| AIR2G2 Ltd | Extraterritorial | 2019 |
| Airline Travel Hub Limited | Administrative & support | 2012 |
| Airspace Aviation Solutions Limited | Transport & logistics | 2000 |
| Aitch Family Limited | Manufacturing | 2014 |
| Aitchisons Landscapes Ltd | Administrative & support | 2010 |
| Aitchisons Living Ltd | Real estate | 2025 |
| Aitsfx Limited | Information & communication | 2015 |
| AJ Hyde Property Limited | Professional & scientific | 2019 |
| AJA Business Services Limited | Professional & scientific | 1995 |
| AJF Contracting Ltd | Construction | 2025 |
| AJH Consultancy and Training Services Limited | Professional & scientific | 2016 |
| AJH Electrical Services Ltd | Energy | 2011 |
| AJM Greenway Properties Limited | Real estate | 2017 |
| Ajosment Consulting Limited | Professional & scientific | 2024 |
| AJR Apparel Limited | Wholesale & retail | 2011 |
| AJS Bargains Macclesfield Ltd | Wholesale & retail | 2025 |
| AJW Gmtta Ltd | Administrative & support | 2022 |
| AK Construction 1 Ltd | Construction | 2025 |
| AK Property Lettings Limited | Real estate | 2018 |
| AK Rosebury Limited | Real estate | 2022 |
| Akar Tattoo Services Ltd | Arts & recreation | 2025 |
| Akbradbury Ltd | Professional & scientific | 2019 |
| Akeru Consult Ltd | Professional & scientific | 2024 |
| Akody Ltd | Financial services | 2013 |
| AKS Global Assets Ltd | Real estate | 2025 |
| AL Muqbel & Co Ltd | Wholesale & retail | 2026 |
| AL Panino Limited | Hospitality | 2000 |
| AL87 Design Ltd | Professional & scientific | 2013 |
| Alan Bradley (Fertilisers) Limited | Wholesale & retail | 1991 |
| Alan LEE Ltd | Real estate | 2019 |
| Alan Talbot Clippers Limited | Other services | 2015 |
| Alan Whalley Builder Limited | Construction | 2003 |
| Alan Wood Property Ltd | Administrative & support | 2014 |
| Alba Jones Limited | Professional & scientific | 2011 |
| Albert Holliday Limited | Construction | 2014 |
| Albert Lodge Management Company Limited | Real estate | 2004 |
| Albion Lock (Sandbach) Management Company Limited | Households | 2016 |
| Alces Malchis Limited | Information & communication | 1998 |
| Alderley Aesthetics Limited | Health & social care | 2026 |
| Alderley Analytical Ltd | Professional & scientific | 2013 |
| Alderley Auto Detailing Limited | Administrative & support | 2020 |
| Alderley Industries Limited | Professional & scientific | 2005 |
| Alderley Investments Limited | Professional & scientific | 2005 |
| Alderley Logs Ltd | Other services | 2019 |
| Alderley Wood Farm Ltd | Agriculture & fishing | 2023 |
| Alembia Intellectual Property Limited | Professional & scientific | 2017 |
| Alex Holbrow Electrical Limited | Construction | 2015 |
| Alex Melia Ltd | Transport & logistics | 2015 |
| Alexander Parker Limited | Wholesale & retail | 2021 |
| Alexandra Mews (Hulme) Management Company Limited | Real estate | 2003 |
| Alfo Express Ltd | Hospitality | 2024 |
| Algreat Professional Services Limited | Financial services | 2009 |
| Ali's Store Ltd | Wholesale & retail | 2026 |
| Alian Property Ltd | Hospitality | 2010 |
| Align Change Thrive Ltd | Professional & scientific | 2025 |
| Alispera Communications Limited | Professional & scientific | 2013 |
| ALL 4 Walls (Equipment) Ltd | Wholesale & retail | 2018 |
| ALL Checked UP Ltd | Extraterritorial | 2022 |
| ALL Energetics Limited | Wholesale & retail | 2011 |
| ALL My Frenz Limited | Professional & scientific | 2022 |
| Allen and Co Services Limited | Construction | 2004 |
| Alleyoop Content Ltd | Professional & scientific | 2019 |
| Allgood Cycling Ltd | Arts & recreation | 2024 |
| Alliant Properties Limited | Real estate | 2012 |
| Allpharma Contracts Services Ltd | Administrative & support | 2022 |
| Allpharma Recruitment Limited | Administrative & support | 2022 |
| Allport Electrical Limited | Other services | 2006 |
| Alma Sheet Metal Ltd | Manufacturing | 1985 |
| Alpacc Limited | Agriculture & fishing | 2020 |
| Alpha Broadcast Limited | Information & communication | 2021 |
| Alpha Management Group Ltd | Real estate | 2022 |
| Alphatech Innovations Limited | Information & communication | 2024 |
| Alpine Sports UK Limited | Extraterritorial | 2008 |
| Alpo Catering Ltd | Hospitality | 2025 |
| Alps Consultants Limited | Professional & scientific | 2020 |
| Alson Construction Ltd | Administrative & support | 2011 |
| Alton Motors Macclesfield Ltd | Wholesale & retail | 2023 |
| Altratech Limited | Manufacturing | 2001 |
| Altrincham International Grammar School Limited | Extraterritorial | 2016 |
| Alvaro Rociano Limited | Manufacturing | 2024 |
| AM Bell Industrial Properties Limited | Financial services | 2023 |
| AM Kenworthy Lettings Limited | Real estate | 2021 |
| AM Lettings and Property Ltd | Real estate | 2022 |
| AM Performance NW Ltd | Wholesale & retail | 2018 |