| A&A Carpentry Ltd | Construction | 2023 |
| A&A Property Services Medway Ltd | Construction | 2022 |
| A&B Construction Ltd | Construction | 2025 |
| A&D Scaffolding Ltd | Construction | 2020 |
| A&F Air Conditioning Ltd | Construction | 2022 |
| A&L Properties and Management Services Limited | Households | 2022 |
| A&R Supplies Ltd | Other services | 2021 |
| A&S Growers | Agriculture & fishing | 2019 |
| A. Osborne Electrical Limited | Construction | 2007 |
| A. Wilson & Co Services Limited | Administrative & support | 2011 |
| A.C. Goatham and SON Limited | Agriculture & fishing | 2015 |
| A.I.M. Building Services (Kent) Limited | Construction | 2022 |
| A.J. Tebbutt Joinery Limited | Manufacturing | 1997 |
| A1 Aluminium Windows Ltd | Manufacturing | 2011 |
| A1 Carpentry Services Ltd | Construction | 2015 |
| A1 Glass (Medway) Limited | Construction | 1998 |
| A1 Good Food Takeaway Ltd | Hospitality | 2025 |
| A1 Reclamation (Strood) Ltd | Wholesale & retail | 2007 |
| A1 Water Treatment Limited | Water & waste | 2022 |
| A2 Accident Repair Centre Ltd | Other services | 2025 |
| A2O Holding International Limited | Financial services | 2023 |
| A4K Global Limited | Information & communication | 2026 |
| AAA Building and Civil Engineers Limited | Construction | 2016 |
| AAA Estates Holdings Ltd | Real estate | 2026 |
| AAA Healthcare Delce Ltd | Wholesale & retail | 2026 |
| AAA Healthcare High Street Ltd | Wholesale & retail | 2026 |
| AAA Rochester Holding Ltd | Wholesale & retail | 2024 |
| Aardvark Developments Limited | Construction | 2021 |
| Aardvark Group Limited | Financial services | 2018 |
| Aardvark Renovations Limited | Construction | 2018 |
| Aari Studios Limited | Wholesale & retail | 2019 |
| Aaron Alessia Properties Ltd | Real estate | 2024 |
| Aaron Paul Stone Investments Limited | Real estate | 2003 |
| Aasuplier Ltd | Wholesale & retail | 2024 |
| AB Communications Consulting Ltd | Information & communication | 2022 |
| AB Electric & Plumbing Ltd | Construction | 2025 |
| Abacus Childrens Nurseries Limited | Education | 2003 |
| Abacus Construction and Renovations Limited | Construction | 2025 |
| Abacus Nurseries Ltd | Education | 2009 |
| Abbey Gardens (Bermondsey) Management Company Limited | Real estate | 1982 |
| Abbey Iconic Limited | Real estate | 2007 |
| Abbey Lofts Management Limited | Real estate | 2010 |
| Abbey Precision Engineering Ltd. | Manufacturing | 2005 |
| Abbeygate One Limited | Hospitality | 2018 |
| Abbott Solutions Ltd | Construction | 2018 |
| Abco Ltd | Financial services | 2008 |
| Abel P Transport Ltd | Transport & logistics | 2026 |
| ABF Highways Limited | Professional & scientific | 2025 |
| Abigail's Footsteps | Health & social care | 2012 |
| Abigold Global Ventures Ltd | Wholesale & retail | 2020 |
| Abikes Beauty Store Limited | Wholesale & retail | 2023 |
| Abit Services Limited | Information & communication | 2021 |
| Abivelle Ltd | Wholesale & retail | 2026 |
| Abi’S Int’L Ltd | Information & communication | 2026 |
| Able Build South Ltd | Construction | 2023 |
| ABM Traders Ltd | Wholesale & retail | 2025 |
| Aboycecorporation Limited | Construction | 2022 |
| Absolute Compliance Limited | Education | 2025 |
| Absolute Property Care Limited | Construction | 2023 |
| Absolute Wonder Limited | Health & social care | 2007 |
| AC Solutions and Services Ltd | Energy | 2022 |
| AC247 Facilities Management Ltd | Administrative & support | 2022 |
| Academy Controls Ltd | Construction | 2020 |
| Accelerated Drain Services Limited | Construction | 2007 |
| Access Media Advisory Limited | Financial services | 2003 |
| Acco SCO Services Ltd | Construction | 2025 |
| Accounting Connections Limited | Professional & scientific | 2013 |
| Accupay Ltd | Professional & scientific | 2024 |
| Accurate Mailing Services Limited | Transport & logistics | 2003 |
| Ace & Edun Consulting Ltd | Wholesale & retail | 2023 |
| Ace Wine Enterprises Ltd | Wholesale & retail | 2023 |
| Acer Construction Solutions Ltd | Construction | 2025 |
| Acer Finance Limited | Real estate | 2026 |
| Acer Fire Protection Limited | Public administration | 2023 |
| Acey Academy Ltd | Professional & scientific | 2024 |
| Acey Bookkeeping Ltd | Professional & scientific | 2022 |
| Acg&S Farming Ltd | Agriculture & fishing | 2011 |
| Achilleas Limited | Manufacturing | 2007 |
| Acorn Building Contractors Ltd | Construction | 2021 |
| Acorn Clinical Solutions Ltd | Health & social care | 2022 |
| Acorn Storage Equipment Limited | Wholesale & retail | 1986 |
| Acorn Storage Holdings Limited | Financial services | 2023 |
| Acorn Storage Solutions Limited | Extraterritorial | 2010 |
| ACQ Solutions Ltd | Extraterritorial | 2012 |
| Acquired Perspective Ltd | Professional & scientific | 2020 |
| ACR Go Ltd | Transport & logistics | 2018 |
| Acres Technology Ltd | Information & communication | 2024 |
| Acreyard Limited | Real estate | 1984 |
| ACS ALL Civils Solutions Ltd | Construction | 2023 |
| ACS Clean and Decs Ltd | Administrative & support | 2022 |
| ACS Clearaway Limited | Administrative & support | 2026 |
| ACS Fire Safety Ltd | Professional & scientific | 2026 |
| Action for Borstal Community Project | Education | 1997 |
| Action Office Systems Limited | Administrative & support | 2008 |
| Acute Elevators North Ltd | Manufacturing | 2023 |
| Acute New Elevators Ltd | Administrative & support | 2023 |
| AD Atelier Group Ltd | Professional & scientific | 2026 |
| AD HOC Media & Investment Consultancy Limited | Information & communication | 2011 |
| AD Labs Ltd | Professional & scientific | 2022 |
| Adam C Entertainment Limited | Information & communication | 2024 |