| ALL Pressed & Ironed Limited | Other services | 2013 |
| ALL Seasons Camper Hire Ltd | Wholesale & retail | 2012 |
| ALL4U Fostering Ltd | Health & social care | 2016 |
| Alladvance Limited | Other services | 2002 |
| Allday Media Limited | Information & communication | 2003 |
| Allen Home Structures Limited | Professional & scientific | 2023 |
| Allen’S Flat Roofing Ltd | Construction | 2025 |
| Alleycat Entertainment Ltd | Arts & recreation | 2018 |
| Alliance London Ltd | Professional & scientific | 2019 |
| Allister Tulett Plumbing and Heating Limited | Construction | 2013 |
| Allspan (UK) Limited | Administrative & support | 1996 |
| Aloted Inc Ltd | Information & communication | 2010 |
| Alpha Commercials Limited | Wholesale & retail | 2000 |
| Alpha LAB Solutions UK Ltd | Professional & scientific | 2026 |
| Alpha Therm Limited | Manufacturing | 1966 |
| Alpine Films Ltd | Information & communication | 2007 |
| Alpine Hotel Investment (NO.1) Limited Partnership | | 2011 |
| Alternative Clean Energy Fund | | 2008 |
| Altitude Business Planning Limited | Professional & scientific | 2012 |
| Alto Inspire Ltd | Information & communication | 2021 |
| AM Advisers Ltd | Professional & scientific | 2017 |
| AMA Freight (UK) Limited | Transport & logistics | 2002 |
| Amala Bay Ltd | Manufacturing | 2020 |
| Amalgamated Drinkables Ltd | Wholesale & retail | 2021 |
| Amber Creative (GFL) Limited | Administrative & support | 2016 |
| Amber Creative Ltd | Administrative & support | 2013 |
| Amberley Homes (Kent) Ltd | Construction | 2014 |
| Amberley House (Crowborough) Ltd | Real estate | 2025 |
| Amelia Roxanna Limited | Manufacturing | 2023 |
| American Nail Fashion Limited | Other services | 2008 |
| Amfoods Group Holdings Ltd | Financial services | 2024 |
| Amfoods Group UK Ltd | Hospitality | 2024 |
| Amherst Accountancy Limited | Professional & scientific | 2001 |
| Amherst Mews Management (Sevenoaks) Ltd | Households | 2020 |
| Amherst School (Academy) Trust | Education | 2011 |
| Amolo Construction Ltd | Administrative & support | 2012 |
| Amos Capital Ltd | Professional & scientific | 2020 |
| AMP Haus Studios Ltd | Professional & scientific | 2025 |
| Amps Electric Bikes Ltd | Wholesale & retail | 2015 |
| Amuse Private Caterers Limited | Hospitality | 2012 |
| Ananea Limited | Information & communication | 2012 |
| Anatomy of a Hotel Ltd | Professional & scientific | 2025 |
| Anchor Talent Solutions Ltd | Administrative & support | 2026 |
| Anco Group Construction Ltd | Construction | 2021 |
| AND Co. Brands Ltd | Manufacturing | 2009 |
| Anderson Decorating & Maintenance Company Ltd | Construction | 2002 |
| Anderson Partners Executive Search Limited | Administrative & support | 2014 |
| Anderson South East Ltd | Real estate | 2015 |
| Andina Ingham Ltd | Manufacturing | 2005 |
| Andina Investments Ltd | Real estate | 2022 |
| Andqfive Ltd | Professional & scientific | 2025 |
| Andrew Thompson Building Limited | Construction | 2003 |
| Andrews Services Limited | Other services | 2025 |
| Andy Logan Flooring Limited | Construction | 2010 |
| Aneo Trade Limited | Wholesale & retail | 2025 |
| Ange Hills Ltd | Financial services | 2012 |
| Angel Design Limited | Construction | 2015 |
| Angel Elevators Ltd | Professional & scientific | 2018 |
| Angels Prestige Property Management Ltd | Real estate | 2026 |
| Angels Prestige Services Ltd | Construction | 2022 |
| Anglolift Limited | Construction | 2003 |
| Animal Couriers Limited | Transport & logistics | 2003 |
| Animals at Home (Tunbridge Wells &Sevenoaks) Ltd | Other services | 2013 |
| Anita M Brown Ltd | Financial services | 2025 |
| ANN Duncombe Holdings Ltd | Real estate | 2018 |
| ANN Palmer Consulting Limited | Professional & scientific | 2013 |
| Anna's Homes and Interiors Ltd | Real estate | 2014 |
| Annabeth Properties Ltd | Real estate | 2023 |
| Annax Development Ltd | Construction | 2021 |
| Another Day Pharma Ltd | Professional & scientific | 2024 |
| Anoume Ltd. | Professional & scientific | 2012 |
| Anoura Company Limited | Wholesale & retail | 2001 |
| Ansco Commercial Management Limited | Administrative & support | 2004 |
| Answered Limited | Information & communication | 2015 |
| Anterospective Limited | Information & communication | 2024 |
| Anthony DI Nola's Tours Limited | Administrative & support | 2014 |
| Anthony’S Midas Training Ltd | Education | 2024 |
| Antivok Limited | Wholesale & retail | 2025 |
| Antonia DE Luca Millinery Limited | Manufacturing | 2025 |
| Antwis Engineering Limited | Professional & scientific | 1999 |
| Aopa Limited | Professional & scientific | 1997 |
| AP Motorsport Limited | Wholesale & retail | 2025 |
| APC Systems Limited | Information & communication | 1991 |
| APE & Oak Ltd | Wholesale & retail | 2025 |
| Apex Analytics Ltd | Information & communication | 2026 |
| Apex Asset Planning Ltd | Professional & scientific | 2020 |
| Apex Construction (Kent) Ltd | Construction | 2019 |
| Apex Garden Products Ltd | Wholesale & retail | 2026 |
| Apex Global Limited | Mining & quarrying | 2001 |
| Apex Power Services Ltd | Professional & scientific | 2015 |
| Apex Resin Solutions Ltd | Construction | 2020 |
| Aplin Dynamics Ltd | Professional & scientific | 2018 |
| APM Building Services (7OAKS) Ltd | Construction | 2012 |
| APM Management Services Ltd | Professional & scientific | 2016 |
| Apollo Insights Ltd | Professional & scientific | 2025 |
| App for Answers Ltd | Information & communication | 2017 |
| Appleby Architects Limited | Professional & scientific | 2012 |
| Appledowne Place Management Limited | Households | 2000 |
| Appletrees Freehold Company Limited | Households | 2010 |
| Applied Equity Partners Ltd | Professional & scientific | 2022 |