| AGE UK Sevenoaks Tonbridge & District | Health & social care | 2001 |
| Agile Electrical Limited | Construction | 2024 |
| Agra Salads UK Ltd | Wholesale & retail | 2020 |
| Agri-Food Solutions Limited | Agriculture & fishing | 2016 |
| Agro-Pro Ltd | Professional & scientific | 2020 |
| AGS Scaffolding (S.E) Ltd | Construction | 2009 |
| AH Arch Holdings Ltd | Financial services | 2025 |
| AHQ Asset Management Ltd | Real estate | 2025 |
| AI Initiative Ltd | Information & communication | 2023 |
| AI Marketing OS Ltd | Information & communication | 2025 |
| Aile Homes Cranbrook Ltd | Construction | 2025 |
| Aile Homes Maidstone Ltd | Construction | 2025 |
| Aimd Art Limited | Arts & recreation | 2016 |
| Air Conditioning & Refrigeration Services Limited | Construction | 2010 |
| Air Contemporary Limited | Wholesale & retail | 2022 |
| Air Investments & Acquisitions Limited | Real estate | 2013 |
| Air Law Group Ltd | Other services | 2015 |
| Air-Style Media Limited | Information & communication | 2020 |
| Aircon Repair Ltd | Energy | 2026 |
| Airey Professional Services Limited | Professional & scientific | 2014 |
| Airey Wedding Services Limited | Other services | 2014 |
| Airies Technology Limited | Financial services | 2021 |
| Airisma Ltd | Professional & scientific | 2025 |
| Airnest Limited | Real estate | 2024 |
| AIZA1987 Limited | Wholesale & retail | 2021 |
| AJ Media Consultants Limited | Professional & scientific | 2017 |
| Ajay Kumar Limited | Professional & scientific | 2012 |
| AJB Development Solutions Ltd | Information & communication | 2012 |
| AJD Grounds Maintenance Ltd | Administrative & support | 2023 |
| Ajgolfuk Ltd | Wholesale & retail | 2023 |
| AJH Interiors Ltd | Construction | 2025 |
| AJT Property Developments Ltd | Real estate | 2024 |
| AK Digital Assets Ltd | Professional & scientific | 2024 |
| Akard Systems Ltd | Administrative & support | 2019 |
| Akiyama Enterprises Limited | Professional & scientific | 2016 |
| AKZ Forest Products Ltd. | Wholesale & retail | 2020 |
| AKZ Timber Limited | Manufacturing | 2009 |
| Alarm Traders Direct Limited | Extraterritorial | 2012 |
| Albanrailservices Ltd | Construction | 2007 |
| Albion Books Limited | Extraterritorial | 2017 |
| Albion Canvas Lodges Ltd | Manufacturing | 2019 |
| Albion Maritime Limited | Transport & logistics | 2022 |
| Albion Music Limited | Information & communication | 1995 |
| Albury Homes Inc Limited | Construction | 2020 |
| Alcoholic Beverage Ventures Ltd | Extraterritorial | 2021 |
| Alcott Group Ltd | Information & communication | 2020 |
| Alderbrook Management Company (Five Oak Green Tonbridge) Limited | Households | 2004 |
| Alders Landscapes Limited | Administrative & support | 2008 |
| Alecsandru Transport Services Ltd | Transport & logistics | 2021 |
| Alera Holdings Ltd | Financial services | 2026 |
| Alex Emery Property Limited | Real estate | 2019 |
| Alex James Coaching Ltd | Arts & recreation | 2021 |
| Alex Lawrence Limited | Health & social care | 2022 |
| Alexander David Electrical Ltd | Construction | 2024 |
| Alexandra Security Limited | Manufacturing | 2013 |
| Alexandra Security Products | | 2009 |
| Alfi UK Ltd | Information & communication | 2006 |
| Alfies Roofing Limited | Construction | 2025 |
| Alfresco Services and Consultancy Limited | Hospitality | 2011 |
| Algonquin Holdings Ltd | Financial services | 2020 |
| Alice Wayre Ltd | Administrative & support | 2026 |
| Alifrangis Consulting Limited | Health & social care | 2019 |
| Aligned Consulting Ltd | Information & communication | 2023 |
| Alignment Strategies Limited | Professional & scientific | 2008 |
| Aliki Hewett Limited | Wholesale & retail | 2023 |
| Aline Medical Ltd | Health & social care | 2023 |
| Alison Pilates Limited | Other services | 2025 |
| Alisoncarsales Limited | Wholesale & retail | 2025 |
| Alkielany Limited | Wholesale & retail | 2022 |
| ALL About Home Care Limited | Health & social care | 2014 |
| ALL Flat Roofing Supplies Ltd | Construction | 2022 |
| ALL Good Consultants Ltd | Information & communication | 2025 |
| ALL PC Services Limited | Construction | 1999 |
| ALL Star Solution Services Ltd | Real estate | 2016 |
| ALL Things Mustard Ltd | Information & communication | 2020 |
| ALL Type Roofing Repairs Ltd | Construction | 2025 |
| Allergy International Ltd | Health & social care | 2022 |
| Allergy Leaders Ltd | Health & social care | 2020 |
| Alliance Platform Lifts Limited | Manufacturing | 2011 |
| Allied Marine Logistics Limited | Professional & scientific | 2008 |
| Allindar Ltd | Information & communication | 2019 |
| Allingham Close Management Company Limited | Households | 2020 |
| Allon Trade Consultancy & Logistics Ltd | Transport & logistics | 2018 |
| Allotrope Tech Ltd | Professional & scientific | 2026 |
| Allvisaworld Limited | Administrative & support | 2024 |
| Alma Atlas Ltd | Information & communication | 2009 |
| Almond Grove Holdings Limited | Professional & scientific | 2023 |
| Alocations Ltd | Information & communication | 2022 |
| Alotech Limited | Information & communication | 2016 |
| Alpha Logistics (Europe) Limited | Transport & logistics | 2010 |
| Alpha Maintenance Services Limited | Construction | 2024 |
| Alpha Search International Ltd | Information & communication | 2012 |
| Alpha Wholesale Hvac Ltd | Wholesale & retail | 2012 |
| Alpine UW (Britain) Ltd | Financial services | 2026 |
| Alter Image (Oak Designs) Limited | Construction | 2003 |
| Alter Image (Property) Limited | Real estate | 2003 |
| Alter Image (Services) Limited | Administrative & support | 2003 |
| Aluminium Powder Coating Limited | Manufacturing | 2023 |
| ALW Roofing Services Ltd | Construction | 2026 |
| Alyris Ltd | Construction | 2023 |