| AM Electrical & EAS Limited | Administrative & support | 2013 |
| AM Finance & Human Resource Solutions Limited | Professional & scientific | 2003 |
| AM Hawkins & Sons Ltd | Construction | 2024 |
| Amala Education | Education | 2017 |
| Amanjeet Sandhu Limited | Health & social care | 2023 |
| Amberlion Construction Limited | Construction | 2014 |
| Ambience Kent Limited | Other services | 2026 |
| Ambrose Business Associates Limited | Information & communication | 2019 |
| AMC Business Support Services Limited | Administrative & support | 2018 |
| AMC Professional Services (Kent) Ltd | Professional & scientific | 2019 |
| Amconsult Ltd | Professional & scientific | 2004 |
| American Nails Salon Limited | Other services | 2022 |
| Amira Logistics Ltd | Transport & logistics | 2017 |
| Ammis Group Limited | Professional & scientific | 2009 |
| Ammis Risk Solutions Limited | Financial services | 2015 |
| Amos Audio Limited | Information & communication | 2010 |
| Amos Ellis Consulting Limited | Professional & scientific | 2015 |
| Amphibeans Ltd | Hospitality | 2022 |
| Amplitude AH Limited | Real estate | 2020 |
| Amplitude FF Limited | Real estate | 2020 |
| AMR Bookkeeping Solutions Limited | Administrative & support | 2005 |
| AMS Surgical Limited | Health & social care | 2024 |
| AN Life - Holding Ltd | Financial services | 2026 |
| Analytica Labs Limited | Information & communication | 2023 |
| Anato Limited | Information & communication | 2018 |
| Anatomy 37 Limited | Arts & recreation | 2021 |
| Andall Legacy Holdings Ltd | Financial services | 2026 |
| Andaze Advantage Consulting Ltd | Professional & scientific | 2023 |
| Andrea Stanford | Extraterritorial | 2024 |
| Andrew Ashby Consulting Limited | Professional & scientific | 2025 |
| Andrew Boakes Associates Limited | Professional & scientific | 2002 |
| Andrew Kellard Associates Limited | Professional & scientific | 2013 |
| Andrew Martyn Homes Ltd | Energy | 2021 |
| Andrew Watkinson Creative Ltd | Professional & scientific | 2017 |
| Andrew Woodall Consulting Ltd | Professional & scientific | 2004 |
| Andy's PEN Shop Limited | Administrative & support | 2011 |
| Ang-Elec Limited | Professional & scientific | 2015 |
| Angel (Tonbridge) Indoor Bowls Association Limited | Arts & recreation | 1981 |
| Angel Lane C.I.C. | Education | 2017 |
| Angelford Consulting Limited | Real estate | 1999 |
| Angelford Holdings Limited | Real estate | 2008 |
| Anidok Limited | Real estate | 2025 |
| Anika Medical Ltd | Health & social care | 2022 |
| Animal Abuse Injustice & Defence Society | Other services | 1984 |
| Animal AID Charitable Trust | Other services | 2012 |
| Animato Studio Limited | Manufacturing | 2021 |
| Anja DE Caux Coaching and Consulting Ltd | Professional & scientific | 2015 |
| Anjanque Designs Ltd | Arts & recreation | 2024 |
| Annamaria's Cakery Ltd | Manufacturing | 2025 |
| Annso Limited | Professional & scientific | 2017 |
| Anorak Property Investments Limited | Real estate | 2023 |
| Anoraks Limited | Professional & scientific | 1999 |
| Ansell Inc. Limited | Manufacturing | 2016 |
| Antila Limited | Real estate | 2024 |
| Antique Vault Limited | Wholesale & retail | 2011 |
| Antlia Limited | Information & communication | 2017 |
| Anyen Property Investments Ltd | Real estate | 2023 |
| AO Eleven Ltd | Professional & scientific | 2024 |
| AOS Landscapes Limited | Administrative & support | 2004 |
| AP Property Consulting Ltd | Real estate | 2026 |
| Apalavra Limited | Education | 2024 |
| Apex Partners (Kent) LLP | | 2014 |
| Apex Partners Limited | Professional & scientific | 2016 |
| Apex Suspended Ceilings & Interiors Ltd | Construction | 2020 |
| Aphrodite Fashion Limited | Information & communication | 2012 |
| APM Groundworks & Maintenance Ltd | Administrative & support | 2024 |
| Appdata Ltd | Information & communication | 2012 |
| Apple Deuce Ltd | Professional & scientific | 2025 |
| Appleton-Bounds Consulting Ltd | Professional & scientific | 2024 |
| Appleyard Therapy Limited | Health & social care | 2014 |
| APT Technical Design Ltd | Professional & scientific | 2009 |
| Aqtp Consultancy Ltd | Professional & scientific | 2026 |
| Aqua Kote Systems Limited | Manufacturing | 1997 |
| Aqualife Sensory Ltd | Education | 2019 |
| Aqualife Swimming Limited | Education | 2017 |
| Aquaneo Limited | Professional & scientific | 2020 |
| Aquarius Maritime Capital Limited | Administrative & support | 2019 |
| Aquila Data Limited | Wholesale & retail | 2009 |
| Arbscapes Contractors Ltd | Administrative & support | 2023 |
| ARCADE78 Limited | Professional & scientific | 2016 |
| Arch.Arch. Studio Ltd | Professional & scientific | 2023 |
| Archbury Construction Ltd | Construction | 2022 |
| Archer Humphryes International Ltd | Professional & scientific | 2025 |
| Archer Humphryes Ltd. | Professional & scientific | 2006 |
| Archilus Design Limited | Construction | 2009 |
| Archipelago Services Limited | Transport & logistics | 2006 |
| Archsys Limited | Information & communication | 2011 |
| Arcsoft Business Solutions Ltd | Information & communication | 2005 |
| Areta Systems Limited | Information & communication | 2007 |
| Argentarius Limited | Administrative & support | 2012 |
| Argentarius Partners LLP | | 2012 |
| Argonaut 2020 Limited | Extraterritorial | 2017 |
| Argonaut Design Limited | Administrative & support | 2020 |
| Aries Plumbing and Heating Ltd | Construction | 2026 |
| Arintelli Ltd | Information & communication | 2025 |
| ARK Technology Ltd | Information & communication | 2018 |
| Arma Connect Limited | Professional & scientific | 2005 |
| Armago Group Ltd | Information & communication | 2020 |
| Armina Ltd | Construction | 2019 |
| Armstrong and Tarry Limited | Real estate | 1991 |