| AB Investments NW Ltd | Construction | 2016 |
| Abacus Properties Halifax NO 2 Ltd | Real estate | 2016 |
| Abbey Grange Care Home Ltd | Health & social care | 2022 |
| Abbey House Building Services Ltd | Construction | 2011 |
| Abbey House Decorating Services Ltd | Construction | 2012 |
| Abbey House Estates Ltd | Real estate | 2010 |
| Abbey House Roof & Gutter Services Ltd | Construction | 2024 |
| Abbie Jade Limited | Wholesale & retail | 2018 |
| Abbottfitness Limited | Arts & recreation | 2020 |
| Abbotts of Burnley Limited | Wholesale & retail | 2009 |
| Abby Axis Ltd | Wholesale & retail | 2024 |
| Abby's Group Limited | Hospitality | 2004 |
| Abcm Property Limited | Real estate | 2025 |
| Aberdeen Spll Products Limited | Wholesale & retail | 2018 |
| Abidis Properties Limited | Households | 2020 |
| Ability First North West Community Interest Company | Education | 2024 |
| Abingdon Sports & Vocational College Ltd | Education | 2020 |
| ABL Clinic Ltd | Other services | 2014 |
| ABM & Sons Properties Ltd | Real estate | 2026 |
| ABM International Ltd | Wholesale & retail | 2021 |
| Abode Lancashire Ltd | Real estate | 2017 |
| Abodel Ltd | Information & communication | 2025 |
| Above & Beyond Hotels Group Ltd | Hospitality | 2026 |
| ABS ( North) Limited | Wholesale & retail | 2022 |
| ABS Distribution Ltd | Wholesale & retail | 2026 |
| Absolute Marketing Ltd | Administrative & support | 2022 |
| Absolute Sales Limited | Construction | 2005 |
| ABU Eesa Ltd | Health & social care | 2015 |
| AC Pro Electrical Ltd | Construction | 2012 |
| Acanthus Design Ltd | Manufacturing | 2013 |
| Accalix Limited | Professional & scientific | 2024 |
| Accel Management Limited | Professional & scientific | 2016 |
| Access Alpha Ltd | Health & social care | 2012 |
| Acclaim Events Ltd | Hospitality | 2018 |
| Accountant PAL Ltd | Professional & scientific | 2022 |
| Accrington Coffee Shop Ltd | Hospitality | 2026 |
| Accrington Heritage Trust | Arts & recreation | 2014 |
| Accrington Road Bathrooms Ltd | Wholesale & retail | 2022 |
| Accrington Road Plumbing and Bathroom Ltd | Wholesale & retail | 2017 |
| Accrued Group Limited | Financial services | 2021 |
| Accrued Holdings Limited | Professional & scientific | 2006 |
| Accrued Plastic Limited | Water & waste | 2000 |
| Accurate Precision International Co. Limited | Administrative & support | 1996 |
| Ace Suspension Ltd | Wholesale & retail | 2023 |
| Acecompany Ltd | Wholesale & retail | 2022 |
| Acewell Electronics Limited | Manufacturing | 1983 |
| ACG Renewables Ltd | Construction | 2022 |
| ACL Elite Services Ltd | Administrative & support | 2026 |
| Acorn Chimney Sweeps Ltd | Administrative & support | 2003 |
| Acorn Engineering Consultancy Limited | Information & communication | 2018 |
| Acorn Recovery Projects | Health & social care | 1997 |
| ACP ALL Cars and Parts Ltd | Wholesale & retail | 2019 |
| ACQ Fit Limited | Wholesale & retail | 2025 |
| Acquire Care Services Ltd | Health & social care | 2022 |
| Acres Park Ltd | Real estate | 2024 |
| Acronyl Limited | Wholesale & retail | 1966 |
| ACS (Blackburn) Limited | Administrative & support | 2001 |
| Action Consulting & Enterprises Ltd | Education | 2021 |
| Active Human Limited | Wholesale & retail | 2015 |
| Actua Transport Limited | Transport & logistics | 2014 |
| Aczel Partners Ltd | Professional & scientific | 2017 |
| AD Fine Jewels Ltd | Manufacturing | 2026 |
| ADA Construction NW Ltd | Construction | 2023 |
| ADA Marketing Limited | Manufacturing | 2024 |
| ADA NW Holdings Ltd | Financial services | 2026 |
| ADA Properties NW Ltd | Real estate | 2025 |
| Adam Bowland Limited | Real estate | 2017 |
| Adam Food Plus Limited | Wholesale & retail | 2024 |
| Adam MB Store Ltd | Wholesale & retail | 2025 |
| Adamas Gems Ltd | Wholesale & retail | 2024 |
| Adamroyd Developments Limited | Construction | 2017 |
| Adbit Limited | Professional & scientific | 2011 |
| ADC Internet Deals Ltd | Wholesale & retail | 2009 |
| ADC Solutions Limited | Professional & scientific | 2001 |
| Addmail Solutions Limited | Manufacturing | 2019 |
| Adeel Groups Ltd | Wholesale & retail | 2025 |
| ADF Business Services Limited | Professional & scientific | 2016 |
| Admiral Housing Ltd | Real estate | 2021 |
| Advance Medica Ltd | Health & social care | 2013 |
| Advance Social Care Holding Limited | Real estate | 2019 |
| Advance Social Care Limited | Health & social care | 2015 |
| Advance Social Care Residential Service Limited | Health & social care | 2024 |
| Advanced Eco Solutions Ltd | Construction | 2023 |
| Advanced Global Ltd | Construction | 2014 |
| Advanced Music Systems Limited | Professional & scientific | 2014 |
| Advanced Water Maintenance Ltd | Administrative & support | 1999 |
| Advent DE MOI Ltd | Wholesale & retail | 2021 |
| Advisers Media International Limited | Extraterritorial | 2001 |
| AE Maintenance Ltd | Manufacturing | 2016 |
| Aedos Capital Partners Ltd | Financial services | 2019 |
| Aeroxcraft Ltd | Manufacturing | 2011 |
| Aesthetica at Flawless Limited | Other services | 2018 |
| Aexpressions Ltd | Information & communication | 2024 |
| Affinity Brickwork & Building Services Limited | Construction | 2017 |
| Affordable Skips Limited | Water & waste | 2015 |
| Afghan Rose Restaurant Limited | Hospitality | 2025 |
| AFI UK Limited | Transport & logistics | 1990 |
| Afru Ltd | Wholesale & retail | 2021 |
| AFS BD Limited | Hospitality | 2015 |
| AGC Property Holdings Ltd | Real estate | 2026 |