| Afemia Ltd | Professional & scientific | 2020 |
| Afflick White Properties Limited | Real estate | 2021 |
| Affordable Accountancy Limited | Professional & scientific | 2011 |
| AFL Wealth Management Limited | Financial services | 2010 |
| Afro Exports Limited | Wholesale & retail | 1982 |
| Afsana Limited | Hospitality | 2024 |
| Aftermath Support Limited | Health & social care | 2004 |
| Afyarepo Ltd | Information & communication | 2019 |
| AG Management & Maintenance Ltd | Real estate | 2016 |
| AG Transformations Ltd | Education | 2024 |
| Agamemnon Bros. Ltd | Wholesale & retail | 2020 |
| Agave Azul Ltd | Hospitality | 2025 |
| AGE Recruitment Ltd | Administrative & support | 2023 |
| Agentic People Ltd | Professional & scientific | 2026 |
| Agentrix Ltd | Professional & scientific | 2024 |
| Ageus Technology Limited | Manufacturing | 2002 |
| Agri Barrow Limited | Wholesale & retail | 2026 |
| Agrid Properties Limited | Real estate | 2002 |
| AGT Building Solutions Ltd | Construction | 2022 |
| AH Asbestos Surveying Ltd | Professional & scientific | 2022 |
| Ah-Ha Ltd | Professional & scientific | 2013 |
| Ahmed Balti House Ltd | Hospitality | 2025 |
| Ahmed Sherif Limited | Health & social care | 2024 |
| AHS Property Developers Limited | Real estate | 2025 |
| AHW Property Group Ltd | Real estate | 2025 |
| AI Cloud Solutions Limited | Information & communication | 2025 |
| AI Physics Ltd | Information & communication | 2024 |
| AID First Ltd | Education | 2020 |
| AIM Cost and Commercial Services Limited | Professional & scientific | 2024 |
| AIM Health Holdings Ltd | Financial services | 2023 |
| Ainsworth Mortgages Limited | Financial services | 2005 |
| Air FLO Aviation Ltd | Transport & logistics | 2025 |
| Air Source Energy Ltd | Construction | 2019 |
| Aircargosolutions Ltd | Transport & logistics | 2025 |
| Airsoft 247 Limited | Manufacturing | 2021 |
| AIS Building Services Limited | Construction | 2023 |
| AJ Aesthetic Beauty Ltd | Wholesale & retail | 2025 |
| AJ and Friends C.I.C. | Health & social care | 2019 |
| AJ Bars Managment Ltd | Hospitality | 2025 |
| AJ Harrington Plumbing Services Ltd | Administrative & support | 2010 |
| AJ Kickzzz Ltd | Wholesale & retail | 2026 |
| AJ Miller (UK) Limited | Construction | 2002 |
| AJ Silver Linings Ltd | Real estate | 2019 |
| Ajab Gajab Indian Street Food PVT Limited | Hospitality | 2026 |
| Ajaunt Solutions Limited | Information & communication | 2019 |
| Ajem Heating Ltd | Construction | 2017 |
| AJL Ventures Limited | Real estate | 2014 |
| AJR Property Centre Ltd | Households | 2025 |
| AJU-4 Ltd | Transport & logistics | 2026 |
| AK GAS & Plumbing Services Limited | Construction | 2017 |
| AK2 Convenience Store Ltd | Wholesale & retail | 2026 |
| AKD Heating & Plumbing Ltd | Construction | 2025 |
| Akesis Imaging Ltd | Health & social care | 2021 |
| AKH Carpentry & Joinery Ltd | Construction | 2025 |
| Aknp Limited | Professional & scientific | 2017 |
| AKO Learning & Development Limited | Professional & scientific | 2014 |
| Akouo Technologies Ltd | Information & communication | 2020 |
| AKP Photography Limited | Professional & scientific | 2019 |
| AKS (Cheshire) Limited | Hospitality | 2013 |
| Aksara SAI Ltd | Wholesale & retail | 2023 |
| Aksp Property Limited | Real estate | 2024 |
| Al's Coaches Limited | Transport & logistics | 2004 |
| Alam Ventures Ltd | Real estate | 2020 |
| Alan D Scoffield Heating Limited | Professional & scientific | 2002 |
| Alan Davies Consulting Limited | Professional & scientific | 2013 |
| Alan Ramsay Sales & Marketing Limited | Administrative & support | 2003 |
| Albany (Rock Ferry) Bowling Club Limited | Arts & recreation | 1921 |
| Alberta Consultants Ltd | Administrative & support | 2007 |
| Albertbridge Road Management Company Limited | Financial services | 2023 |
| Alchemy Visualization Limited | Professional & scientific | 2016 |
| Alchrom Ltd | Information & communication | 2013 |
| Alcott Insulations Ltd | Construction | 2019 |
| Alcris Builders Limited | Construction | 2021 |
| Alcxhmy Limited | Real estate | 2020 |
| Aldan Ltd | Construction | 2022 |
| Aldbury Management UK Limited | Real estate | 2020 |
| Aldeo Limited | Professional & scientific | 2009 |
| Alderdale Europe Ltd | Professional & scientific | 2019 |
| Aldous Homes Limited | Wholesale & retail | 2023 |
| Aldwinckle Associates Ltd | Professional & scientific | 2020 |
| Alef Trust CIC | Education | 2012 |
| Alepservices Ltd | Education | 2026 |
| Alex Potts Limited | Professional & scientific | 2019 |
| Alex Squared Dairy Trading & Aviation Services Ltd | Manufacturing | 2019 |
| Alexa Rays Limited | Health & social care | 2020 |
| Alexander Arthur Consulting Ltd | Professional & scientific | 2021 |
| Alexander Bespoke Plumbing Services Ltd | Construction | 2020 |
| Alexander Eccles Limited | Professional & scientific | 1951 |
| Alexanders Natural Ltd | Manufacturing | 2021 |
| Alexkare Support and Care Ltd | Health & social care | 2023 |
| Alfa Property Investment Group Ltd | Real estate | 2020 |
| Alfi Property Group Limited | Real estate | 2016 |
| ALH Limited | Real estate | 2025 |
| Alice Tutoring Limited | Education | 2018 |
| Aligned Web Limited | Administrative & support | 2021 |
| ALIVE365 Limited | Education | 2024 |
| Alkat Johnson Properties Ltd | Real estate | 2025 |
| ALL Electrical Services (North West) Limited | Manufacturing | 2002 |
| ALL Flooring Surfaces Ltd | Construction | 2024 |
| ALL Horsed UP Ltd | Wholesale & retail | 2018 |