| AA Trading Associates Ltd | Wholesale & retail | 2019 |
| Aa's Esol Tuition and Education Services Ltd | Education | 2021 |
| AAA Executive Chauffeurs Ltd | Other services | 2019 |
| AAA Healthcare Agency Limited | Health & social care | 2015 |
| AAA Pharma Limited | Wholesale & retail | 2019 |
| AAA Plus Trading Co Limited | Wholesale & retail | 2025 |
| AAA Taxis (Preston) Ltd | Other services | 2010 |
| AAB Developments Limited | Construction | 2016 |
| AAB Northwest Ltd | Administrative & support | 2019 |
| Aadamson House Care Home Ltd | Health & social care | 2019 |
| Aadhya Wellness Studio Limited | Wholesale & retail | 2026 |
| Aadorn Attire Ltd | Wholesale & retail | 2021 |
| Aafiyah Trade Ltd | Wholesale & retail | 2023 |
| AAIMA786 Limited | Health & social care | 2025 |
| Aaisha Investments Ltd | Real estate | 2025 |
| AAK Incorporated Limited | Wholesale & retail | 2018 |
| Aalborg Place LLP | | 2009 |
| AAM Apex Ltd | Wholesale & retail | 2026 |
| AAM Candy Ltd | Wholesale & retail | 2024 |
| AAM Vapes Limited | Wholesale & retail | 2023 |
| Aams Solutions Ltd | Administrative & support | 2025 |
| Aamzain Ltd | Real estate | 2025 |
| Aaoe Limited | Administrative & support | 2025 |
| AAR Consultancy Ltd | Wholesale & retail | 2026 |
| Aara Skin Limited | Wholesale & retail | 2025 |
| Aarav Consultancy Limited | Information & communication | 2025 |
| Aaron Putman Ltd | Administrative & support | 2025 |
| Aaron Walker Associates Ltd | Professional & scientific | 2023 |
| Aarya and Ananya Ltd | Real estate | 2025 |
| AAS Cabling Solutions Limited | Construction | 2024 |
| AAS Estates Limited | Real estate | 2024 |
| AAS Global Ltd | Wholesale & retail | 2025 |
| AAS Inventory Limited | Construction | 2020 |
| Aasem & Noor Ltd | Hospitality | 2018 |
| Aashaa Ltd. | Information & communication | 2017 |
| Aass Estates Ltd | Real estate | 2026 |
| Aaun Ltd | Health & social care | 2023 |
| Aayasir Limited | Professional & scientific | 2023 |
| AB Admin Ltd. | Administrative & support | 2016 |
| AB Cabs (Contracts) Limited | Transport & logistics | 2009 |
| AB Concept Business Solutions Ltd | Financial services | 2018 |
| AB Diagnostic Imaging Limited | Health & social care | 2025 |
| AB Etrade Ltd | Wholesale & retail | 2014 |
| AB Findings Ltd | Water & waste | 2018 |
| AB Properties (NW) Ltd | Real estate | 2020 |
| AB Trailer Sales Ltd | Wholesale & retail | 2022 |
| Abacus Plastering Preston Limited | Construction | 2019 |
| Abaseen Bradford Limited | Real estate | 2026 |
| Abayagirl Limited | Wholesale & retail | 2023 |
| Abberley Design Consultants Limited | Professional & scientific | 2019 |
| Abberton Evermor Limited | Real estate | 2022 |
| Abbey Fire Protection Limited | Manufacturing | 1998 |
| Abbey Leisure Amusement Machines Limited | Hospitality | 1987 |
| Abbey Scaffolding Hire Limited | Construction | 2010 |
| Abbeydale Food Group Limited | Manufacturing | 2010 |
| Abbeyfield Civil Engineering Ltd | Construction | 2018 |
| Abbeystead Gardens Management Company Limited | Households | 2015 |
| Abbots Court Flat Management Limited | Households | 1975 |
| Abbotsmead Properties (Barrow) Limited | Construction | 1964 |
| ABC Design and Communications Limited | Information & communication | 2009 |
| ABC Power Systems Ltd | Manufacturing | 2011 |
| ABC Vehicle Solutions Ltd | Wholesale & retail | 2024 |
| Abdullah Holdings Limited | Extraterritorial | 2026 |
| Abdulnabi Ltd | Health & social care | 2024 |
| Abduls Spice Ltd | Hospitality | 2024 |
| Abeera Investment Limited | Wholesale & retail | 2021 |
| Abercorn Investments Consultants Ltd | Real estate | 2007 |
| ABG Associates Ltd | Construction | 2022 |
| Abhi Holdings Limited | Financial services | 2023 |
| ABI.STUDIO19 Ltd | Other services | 2015 |
| Abibutt Limited | Wholesale & retail | 2026 |
| Abigail Sherlock Studios Limited | Professional & scientific | 2023 |
| Ability 2 Care Ltd | Health & social care | 2023 |
| Ability GAS Services Ltd | Construction | 2006 |
| Abimogh Ltd | Construction | 2013 |
| Abinash Super Store Ltd | Wholesale & retail | 2023 |
| Able 2 Care Ltd | Health & social care | 2022 |
| Able Support Solutions Ltd | Administrative & support | 2024 |
| Ablegood Services Ltd | Professional & scientific | 2012 |
| Ablelec Limited | Construction | 2003 |
| Ablewear Europe Ltd | Wholesale & retail | 2023 |
| Ably IMB Ltd | Financial services | 2025 |
| Abnis Ltd | Other services | 2020 |
| Abnsholding Ltd | Real estate | 2024 |
| Abodes Haven Limited | Real estate | 2024 |
| ABR Properties (NW) Ltd | Real estate | 2015 |
| Abraham Care Services Ltd | Health & social care | 2015 |
| Abrams Ashton Group Limited | Professional & scientific | 2017 |
| ABS Holding Group Ltd | Professional & scientific | 2017 |
| ABS Pawsome Adventures Limited | Other services | 2026 |
| ABS Warehousing Ltd | Transport & logistics | 2025 |
| Absdelights Ltd | Hospitality | 2025 |
| Absolute Aesthetics Preston Ltd | Other services | 2021 |
| Absolute Angels Nursery Ltd | Health & social care | 2019 |
| Absolute GAS Ltd | Wholesale & retail | 2021 |
| Absolute Transformation Solutions Limited | Professional & scientific | 2009 |
| Absolutely Properties Limited | Extraterritorial | 2021 |
| Abssolution Prime Limited | Administrative & support | 2025 |
| Abstrade Ltd | Financial services | 2021 |
| Absx Limited | Wholesale & retail | 2021 |