| Adelphi Automation Ltd | Professional & scientific | 2012 |
| Adelphi Bathrooms (Bollington) Ltd | Wholesale & retail | 2022 |
| Adelphi Bathrooms Limited | Wholesale & retail | 2024 |
| Adelphi Developments Ltd | Construction | 2016 |
| Adelphos Limited | Real estate | 2016 |
| Adept Clearance & Cleaning Services Limited | Other services | 2014 |
| Adepteo Limited | Information & communication | 2009 |
| ADH Duck Ventures Ltd | Real estate | 2025 |
| ADH Metals Consultancy Ltd | Wholesale & retail | 2025 |
| Adhesion Ltd | Information & communication | 2024 |
| ADI Logo Ltd | Transport & logistics | 2021 |
| Adidas (U.K.) Limited | Wholesale & retail | 1972 |
| Adithefastest Ltd | Wholesale & retail | 2025 |
| Adlington Fencing Supplies Ltd | Manufacturing | 2024 |
| Adlington Grange Limited | Households | 2007 |
| Adlington Petting Farm Ltd | Arts & recreation | 2016 |
| ADM Electrical Contractors Limited | Construction | 2013 |
| ADM Manchester Limited | Wholesale & retail | 2016 |
| ADM MCR Ltd | Wholesale & retail | 2025 |
| ADM Renovations Limited | Construction | 2023 |
| Admentoris Ltd | Professional & scientific | 2021 |
| Admg Holdings Limited | Wholesale & retail | 2005 |
| Admiral Travel UK Limited | Administrative & support | 2000 |
| Admq Ltd | Professional & scientific | 2023 |
| Adnett Consulting Limited | Professional & scientific | 2019 |
| ADO Eiendom 80 Ltd | Administrative & support | 2011 |
| Adora Home Limited | Manufacturing | 2026 |
| Adored Entertainment Limited | Information & communication | 2026 |
| Adorn Catering Limited | Hospitality | 2026 |
| Adra Business Services Limited | Professional & scientific | 2018 |
| Adra Domek Limited | Professional & scientific | 2021 |
| Adra Residential Developments Limited | Real estate | 2019 |
| Adrenal Security Services Ltd | Administrative & support | 2026 |
| Adrenaline Combatives Ltd | Extraterritorial | 2025 |
| Adria Solutions Limited | Professional & scientific | 2004 |
| Adrian Vickerton Limited | Wholesale & retail | 2006 |
| Adrl Group Ltd | Manufacturing | 2025 |
| Adroitminds Limited | Other services | 2018 |
| ADS Corporation Ltd | Professional & scientific | 2022 |
| Adswood Bargain Store Ltd | Hospitality | 2023 |
| Adswood MOT Centre Ltd | Wholesale & retail | 2025 |
| Adswood Road Property Ltd | Other services | 2023 |
| ADT Fabrication Services Ltd | Manufacturing | 2008 |
| Adult Dyslexia Consulting Limited | Education | 2009 |
| ADV Finance Ltd | Financial services | 2015 |
| ADV Marine and Shore Service Ltd | Administrative & support | 2007 |
| ADV Media Productions Limited | Information & communication | 2024 |
| Advance Alloys North West Ltd | Wholesale & retail | 2007 |
| Advance Driving School Ltd | Education | 2024 |
| Advance Physio Limited | Other services | 2007 |
| Advance REC 2 REC Solutions Ltd | Administrative & support | 2012 |
| Advance Utilities Ltd | Administrative & support | 2016 |
| Advanced Accessories Limited | Wholesale & retail | 2003 |
| Advanced Battery Supplies Ltd | Wholesale & retail | 2011 |
| Advanced Building Design Limited | Manufacturing | 1998 |
| Advanced Comms Limited | Administrative & support | 2015 |
| Advanced Exterior Cleaning Ltd | Administrative & support | 2023 |
| Advanced Groundworks and Developments Limited | Construction | 1999 |
| Advanced Information Development & Consulting Ltd. | Administrative & support | 2006 |
| Advanced IPC Limited | Manufacturing | 2024 |
| Advanced Meeting Solutions (International) Limited | Information & communication | 1999 |
| Advanced Mortgage Planning Ltd. | Financial services | 2025 |
| Advanced Overland UK Ltd | Wholesale & retail | 2024 |
| Advanced Plastering & Property Systems Limited | Construction | 2015 |
| Advanced Seating (NW) Limited | Manufacturing | 2022 |
| Advanced Solutions UPS Limited | Manufacturing | 2014 |
| Advanced Technology Consultants Limited | Information & communication | 1994 |
| Advanced Wall 2 Wall Building Services Limited | Construction | 2023 |
| Advancemoat Limited | Professional & scientific | 2026 |
| Advansci Limited | Professional & scientific | 2011 |
| Advantage Extra Limited | Administrative & support | 2021 |
| Advantage Land Promotion Opportunities Limited | Real estate | 2017 |
| Adventure Pods & Services Ltd | Manufacturing | 2024 |
| Adventures by Mail (Europe) Limited | Information & communication | 1995 |
| Adventures of DOM Ltd | Professional & scientific | 2025 |
| Adversity Innovate Limited | Professional & scientific | 2026 |
| Advertising Resources Limited | Administrative & support | 1994 |
| Adviseit Invest Ltd | Professional & scientific | 2006 |
| Adviser Cloud Limited | Information & communication | 2013 |
| Adviser Portals Ltd | Information & communication | 2003 |
| Advisertech Connect Limited | Financial services | 2026 |
| Ady's Community Kitchen CIC | Hospitality | 2019 |
| AE Horizons Ltd | Professional & scientific | 2025 |
| AE61 Surveying Limited | Professional & scientific | 2025 |
| Aecern Coaching Limited | Professional & scientific | 2012 |
| AEE Contractors Limited | Wholesale & retail | 2017 |
| AEG 1440 Holdings Ltd | Financial services | 2021 |
| AEG Operations Ltd | Financial services | 2025 |
| AEG Private Ltd | Financial services | 2025 |
| Aegis Development Ltd | Information & communication | 2006 |
| Aegis Estates Ltd | Real estate | 2026 |
| Aegis Investco Limited | Financial services | 2024 |
| AEH Avsec Consultants Limited | Transport & logistics | 2018 |
| AEH Property Development Limited | Real estate | 2020 |
| AEI Services Ltd | Professional & scientific | 2024 |
| Aemg Europe Limited | Administrative & support | 2013 |
| Aeon Time Trade 6900 Ltd | Other services | 2025 |
| Aerocloud Systems Limited | Information & communication | 2017 |
| Aeroco Group International Limited | Manufacturing | 2012 |
| Aeroco Group Limited | Financial services | 2021 |