| Abril Industrial Waxes Limited | Manufacturing | 2003 |
| Absolu Limited | Professional & scientific | 2016 |
| Absolute Football Trivia Ltd | Information & communication | 2025 |
| Absolute Lifts Limited | Construction | 2013 |
| Absolute Pest Control Limited | Construction | 2006 |
| Abstract Systems Limited | Construction | 2000 |
| Acclaimed Care Ltd | Health & social care | 2018 |
| Accountancywise Limited | Professional & scientific | 2017 |
| ACD Developments Ltd | Professional & scientific | 2025 |
| Ace Industrial Supplies Limited | Extraterritorial | 2023 |
| Aces Auto Mall Ltd | Wholesale & retail | 2016 |
| ACF Enterprise Limited | Administrative & support | 2014 |
| ACG Nextgen Partners Limited | Administrative & support | 2020 |
| Acjw Medical Limited | Health & social care | 2010 |
| Acorn Plant & Tool Hire Limited | Administrative & support | 2006 |
| Acorn Warehouse Solutions Ltd | Construction | 2006 |
| Acqumine Limited | Information & communication | 2016 |
| Acre Data Services Ltd | Financial services | 1998 |
| ACT Engineering Limited | Manufacturing | 2023 |
| ACT Performance Products Limited | Manufacturing | 2003 |
| Actiontimevision Limited | Professional & scientific | 2004 |
| Active Fundraising Ltd | Administrative & support | 2023 |
| Active Moves Limited | Transport & logistics | 2010 |
| Active Revival Ltd | Other services | 2025 |
| Actually Changing the World Ltd | Professional & scientific | 2021 |
| Actus HR Limited | Administrative & support | 2024 |
| AD Anaesthesia Limited | Health & social care | 2026 |
| AD Integrum Vascular & Wound Care Ltd | Health & social care | 2019 |
| AD Liver Partners Limited | Health & social care | 2019 |
| AD Series Displays Manufacturing Ltd. | Manufacturing | 2011 |
| AD Valorem Arnold Doors Creditors Partnership | | 1999 |
| AD Valorem Buckley-Bennion Creditors Partnership | | 1999 |
| AD Valorem Candamill Creditors Partnership | | 1999 |
| AD Valorem Choicerange Creditors NO.1 Partnership | | 1999 |
| AD Valorem Cozens-Smith Creditor Partnership | | 1999 |
| AD Valorem Ductline Systems Creditors Partnership | | 1999 |
| AD Valorem E.J. Haines Creditors Partnership | | 1999 |
| AD Valorem Gray Multi-Services Creditors Partnership | | 1999 |
| AD Valorem Greenwoods Creditors Partnership | | 1999 |
| AD Valorem Hospitality Services Creditors Partnership | | 1999 |
| AD Valorem Keldis Trading Creditors Partnership | | 1999 |
| AD Valorem Manchetts Creditors Partnership | | 1999 |
| AD Valorem Motatec Creditors Partnership | | 1999 |
| AD Valorem Nor-An Lighting Creditors Partnership | | 1999 |
| AD Valorem Northumbria Group Creditors Partnership | | 1999 |
| AD Valorem Parcel Exchange Creditors Partnership | | 1999 |
| AD Valorem Parkes Food Creditors Partnership | | 1999 |
| AD Valorem Plexus Contracts Partnership | | 1999 |
| AD Valorem Pro Vogue NO.1 Creditors Partnership | | 1999 |
| AD Valorem Pro Vogue NO.2 Creditors Partnership | | 1999 |
| AD Valorem Robert Gray Creditors Partnership | | 1999 |
| AD Valorem Solent Engineering Creditors Partnership | | 1998 |
| AD Valorem Southgate Convervatories Creditors Partnership | | 1999 |
| AD Valorem Victory Mechanical Creditors Partnership | | 1999 |
| AD Valorem Whitelight Engineering Creditors Partnership | | 1999 |
| AD Valorem Windows 2000 Creditors Partnership | | 1999 |
| Adam Reavely Tennis (Art) Ltd. | Arts & recreation | 2011 |
| Adams Wharf Management Company Limited | Households | 2019 |
| Adaro Group Limited | Professional & scientific | 2007 |
| Adaro Optics Limited | Information & communication | 2006 |
| Adaro Software Ltd | Information & communication | 2007 |
| Additional Services Ltd | Administrative & support | 2020 |
| Addressed National Ltd | Real estate | 2016 |
| Adena Fires Limited | Construction | 2022 |
| Adena Kent Limited | Financial services | 2019 |
| Adept Construction (Kent) Limited | Construction | 2014 |
| Adfx Trading Ltd | Financial services | 2019 |
| Adhya Medical Ltd | Health & social care | 2019 |
| Adisys Consulting Ltd | Information & communication | 2007 |
| Adjuvantyx Ltd | Professional & scientific | 2018 |
| Adrian Scripps Limited | Agriculture & fishing | 1964 |
| Adsl Proprietary Limited | Real estate | 2006 |
| Advanced Energy Equity Ventures Ltd | Professional & scientific | 2024 |
| Advanced Healthcare Ltd. | Manufacturing | 1986 |
| Advanced Neurosurgery Ltd | Health & social care | 2016 |
| Advanced Property Services Southeast Limited | Construction | 2026 |
| Advantage International Moving and Storage Ltd | Transport & logistics | 2025 |
| Advantage International Relocation Limited | Professional & scientific | 2005 |
| Advantage UK Ltd | Construction | 1976 |
| Advent Engineering Solutions Ltd | Professional & scientific | 2023 |
| Adventum Property Limited | Real estate | 2022 |
| Advertisingsales.Co.Uk Limited | Real estate | 2000 |
| AE Coffee Cruiser Ltd | Hospitality | 2025 |
| Aedifico Limited | Construction | 1996 |
| AEM Car Sales Limited | Wholesale & retail | 2023 |
| Aema Tech Limited | Administrative & support | 2014 |
| Aeon Sportscars Ltd | Wholesale & retail | 2000 |
| Aequitas LF UK Ltd | Financial services | 2025 |
| Aequus Financial Limited | Professional & scientific | 2016 |
| Aesthetic Orthodontics Limited | Health & social care | 2019 |
| Aeterna Investments Limited | Other services | 2008 |
| Aethergrove Ltd | Wholesale & retail | 2025 |
| AF Finance Limited | Administrative & support | 2025 |
| Afcompro Ltd | Real estate | 2025 |
| Affordable Flooring Solutions Ltd | Construction | 2019 |
| Africa at Home Limited | Wholesale & retail | 2020 |
| AFS SAP Solutions Limited | Information & communication | 2014 |
| AG Holdings (Kent) Limited | Financial services | 2018 |
| AGC (Commodity Store) Limited | Other services | 1986 |
| AGC Property Limited | Construction | 2012 |