| ADT Medical & Public Health Consulting Limited | Professional & scientific | 2024 |
| Aduabaah Enterprise Ltd | Construction | 2020 |
| Adult Social Work Partnerships Ltd | Health & social care | 2015 |
| Adulthood Limited | Arts & recreation | 2020 |
| Advance Developments Ltd | Construction | 2017 |
| Advance Engineering Solutions Limited | Real estate | 2011 |
| Advance Global Services Limited | Real estate | 2020 |
| Advance IP Technologies Limited | Professional & scientific | 2004 |
| Advance Skip Hire Ltd | Water & waste | 2020 |
| Advance Technology Limited | Construction | 1997 |
| Advanced Building Service Solutions Ltd | Construction | 2006 |
| Advanced Business Machines (North West) Limited | Information & communication | 1990 |
| Advanced Ceilings Limited | Hospitality | 1996 |
| Advanced Clinical Services Ltd | Health & social care | 2026 |
| Advanced Construction Products Ltd | Manufacturing | 2024 |
| Advanced Craft Brickwork Ltd | Construction | 2022 |
| Advanced Dental Solutions Ltd | Education | 2025 |
| Advanced Electrical Services North West Ltd | Construction | 2024 |
| Advanced Electrical Testing Ltd | Real estate | 2017 |
| Advanced Engineering Services (International) Limited | Professional & scientific | 2003 |
| Advanced Growers Ltd | Agriculture & fishing | 2020 |
| Advanced Heating and Plumbing Technical Services Ltd | Construction | 2015 |
| Advanced Heating Group NW Ltd | Construction | 2021 |
| Advanced Insulation Solutions Ltd | Construction | 2019 |
| Advanced Liquid Feeds Limited | Wholesale & retail | 2013 |
| Advanced Logistical Solutions Ltd | Transport & logistics | 2025 |
| Advanced Online Solutions Ltd | Information & communication | 2023 |
| Advanced Paint Repair Ltd | Wholesale & retail | 2022 |
| Advanced Perspective Project Solutions Limited | Information & communication | 2017 |
| Advanced Plumbing & Heating Solutions Ltd | Construction | 2025 |
| Advanced Precision Engineering Ltd | Manufacturing | 1973 |
| Advanced Quality Solutions NW Ltd | Information & communication | 2022 |
| Advanced Sales (UK) Ltd | Real estate | 2010 |
| Advanced Technical Cleaning Solutions UK Limited | Administrative & support | 2024 |
| Advanced Websites Limited | Information & communication | 2026 |
| Advanta Build Group Ltd | Construction | 2024 |
| Advantage Bay One Ltd | Real estate | 2025 |
| Advantage Developments NW Limited | Construction | 2023 |
| Advantage Investment Ltd | Real estate | 2020 |
| Advantage Lettings and Management Ltd | Real estate | 2024 |
| Advantage Real Estate Ltd | Real estate | 2024 |
| Advantage Sports Development UK Ltd | Education | 2024 |
| Advecto Media Limited | Information & communication | 2016 |
| Advenio Ltd | Professional & scientific | 2024 |
| Advent Gift Company Ltd | Wholesale & retail | 2025 |
| Advent House Limited | Real estate | 2024 |
| Advent Plastering & Building Ltd | Construction | 2007 |
| Adventnatura Limited | Wholesale & retail | 2022 |
| Adventure Catalysts Limited | Arts & recreation | 2002 |
| Adventure Code CIC | Education | 2026 |
| Adventure Code Community Ltd | Administrative & support | 2022 |
| Adventure Code International Ltd | Administrative & support | 2023 |
| Adventure Unlocked Ltd | Education | 2021 |
| Adventuresholic Ltd | Administrative & support | 2018 |
| Adversity Songs Ltd | Information & communication | 2022 |
| Adverthead Limited | Professional & scientific | 2024 |
| Advise Involve Ltd | Professional & scientific | 2026 |
| Advisio Group Ltd | Professional & scientific | 2022 |
| Advocacy & Interaction Limited | Administrative & support | 2011 |
| Advocate Associate Consultants Limited | Administrative & support | 2012 |
| Advocate Group International Ltd | Administrative & support | 2024 |
| Advokat Consultancy Ltd | Professional & scientific | 2019 |
| ADY Logystics Ltd | Transport & logistics | 2024 |
| Ady&Flo Trans Ltd | Transport & logistics | 2018 |
| AE & a Property Ltd | Real estate | 2026 |
| AE HAS Limited | Hospitality | 2025 |
| AE MOS NW Limited | Real estate | 2025 |
| AE Qualitybuild Ltd | Construction | 2026 |
| AE Training Solutions Limited | Education | 2022 |
| Aeams Europe Ltd | Professional & scientific | 2014 |
| AEE Test Ltd | Information & communication | 2014 |
| Aegis Core Limited | Real estate | 2025 |
| Aegis Specialist Services Ltd | Professional & scientific | 2026 |
| AEH Holdings Limited | Professional & scientific | 2015 |
| AEK Building Limited | Construction | 2025 |
| AEL Developments Limited | Construction | 2016 |
| AEL Joinery Limited | Construction | 2025 |
| AEM Furniture Limited | Wholesale & retail | 2024 |
| Aemi Ltd | Health & social care | 2022 |
| Aengus Limited | Professional & scientific | 2001 |
| Aenon Limited | Information & communication | 2009 |
| Aeon Homes Ltd | Construction | 2018 |
| Aeon I.T. Limited | Information & communication | 2014 |
| Aerial Gymnastics Academy Ltd | Arts & recreation | 2017 |
| Aerial Gymnastics Community Events CIC | Education | 2023 |
| Aerial SW Ltd | Construction | 2025 |
| Aerial Vision Solutions Ltd | Information & communication | 2015 |
| Aerialninjas Ltd | Arts & recreation | 2021 |
| Aerialtek Site Solutions Ltd | Construction | 2018 |
| Aero Holdings Limited | Real estate | 2026 |
| Aerofirm Ltd | Professional & scientific | 2019 |
| Aeronix Limited | Wholesale & retail | 2025 |
| Aerortiz Ltd | Manufacturing | 2021 |
| AES Energy Ltd | Construction | 2018 |
| AES Solutions Ltd | Real estate | 2023 |
| Aesculapius Medico Legal Ltd | Administrative & support | 2015 |
| Aesthechic Limited | Other services | 2025 |
| Aesthetic Affirmation Limited | Health & social care | 2024 |
| Aesthetic Escapes Ltd | Hospitality | 2024 |
| Aesthetica by SJ Limited | Other services | 2020 |