| ASH Kent Limited | Wholesale & retail | 2020 |
| Ashdown Fields Management Limited | Households | 2017 |
| Ashford Clinical Providers Limited | Health & social care | 2014 |
| Ashford Road Car Services Ltd | Other services | 2020 |
| Ashford Road Tyre Centre Ltd | Wholesale & retail | 2022 |
| Ashford Stratton & Co Limited | Extraterritorial | 2000 |
| Ash’S Vehicle Valet and Detailing Ltd | Administrative & support | 2025 |
| Asia Wire Report Limited | Administrative & support | 2016 |
| Asian Bureau for Conservation Ltd | Professional & scientific | 2021 |
| Aspira Training Limited | Education | 2010 |
| Aspiration Films (Telstar) Limited | Information & communication | 2007 |
| Aspire Homes (Europe) Limited | Real estate | 2017 |
| Aspiring HR Limited | Administrative & support | 2014 |
| Assembly of GOD Conamad Limited | Other services | 2024 |
| Asset Information Solutions Ltd | Information & communication | 2014 |
| Assini Limited | Health & social care | 2012 |
| Assir Consultancy Limited | Information & communication | 2025 |
| Assl Investments Limited | Financial services | 2025 |
| Association of British Dispensing Opticians(The) | Education | 1986 |
| Association of Nephrology Nurses UK Limited | Education | 2021 |
| Association of Tourist Attractions in Kent Limited | Other services | 1991 |
| Assured Contractors London and Kent Limited | Construction | 2024 |
| Asta Construction Services Ltd | Construction | 2025 |
| Aster Properties Ltd | Health & social care | 2026 |
| Aster Solutions Ltd | Information & communication | 2023 |
| Astratius Limited | Wholesale & retail | 2025 |
| Astute Data Systems Limited | Information & communication | 1996 |
| AT One Studio Ltd | Health & social care | 2022 |
| Atanasius Limited | Extraterritorial | 2013 |
| Athena Festivals Limited | Administrative & support | 2023 |
| Athena Property Ltd | Real estate | 2012 |
| Atkin Guitars Limited | Manufacturing | 2019 |
| Atlantic Technica Properties Limited | Construction | 1991 |
| Atlantis HC Digital Ltd | Other services | 2014 |
| Atlas Hotels Canterbury Ltd | Administrative & support | 2016 |
| Atlas Partners Group Limited | Other services | 2016 |
| Atlas Partners Investments Ltd | Financial services | 2015 |
| Atlas Partners Ltd | Professional & scientific | 2014 |
| Atlas Stone Ltd | Construction | 2025 |
| Atlas Stone Products Limited | Manufacturing | 1994 |
| Atmosphere Technologies UK Limited | Manufacturing | 2010 |
| Atrium Education Ltd | Education | 2022 |
| Aubergine the Caterers Ltd | Hospitality | 2025 |
| Auction Plus Ltd | Administrative & support | 2006 |
| Audiocrew Ltd | Administrative & support | 2017 |
| AUM Apparel Ltd | Manufacturing | 2025 |
| Aura Vibe Ltd | Other services | 2017 |
| Aurolink Innovations Ltd | Transport & logistics | 2025 |
| Aurora BNL Limited | Real estate | 2025 |
| Aurora PUB Holdings Limited | Hospitality | 2026 |
| Austin Friars Capital Limited | Financial services | 2021 |
| Austin, Taylor Limited | Professional & scientific | 2009 |
| Austin, Taylor Properties Limited | Professional & scientific | 2022 |
| Authentic Eatery Group Ltd | Hospitality | 2025 |
| Auto Spa Solutions Ltd | Wholesale & retail | 2026 |
| Autocare Canterbury Ltd | Wholesale & retail | 2025 |
| Autopos Ltd | Information & communication | 2020 |
| Autouseful Ltd | Wholesale & retail | 2015 |
| Auxiliary Ground Works Ltd | Construction | 2022 |
| AVA Education Ltd | Education | 2019 |
| Avandra Holdings Ltd | Financial services | 2025 |
| Avaney Limited | Professional & scientific | 2025 |
| AVC Healthcare Limited | Health & social care | 2022 |
| Avcilar Group Ltd | Hospitality | 2024 |
| Avdimou Holdings Limited | Financial services | 2020 |
| Aveiroe Europe LLP | | 2015 |
| Avenue Accounting Limited | Professional & scientific | 2012 |
| Avesa Group Limited | Financial services | 2016 |
| Avidhara Ltd | Wholesale & retail | 2025 |
| Avienta Ltd | Administrative & support | 2025 |
| Avione Lending Limited | Financial services | 2022 |
| Avione Saving & Investment Ltd | Professional & scientific | 2020 |
| Avocet Accounts Ltd | Professional & scientific | 2022 |
| Avondale Investment Management Limited | Financial services | 2011 |
| AW Hair Extensions Ltd | Manufacturing | 2012 |
| Awestra Ltd | Wholesale & retail | 2024 |
| Axam Limited | Construction | 2016 |
| Axiom Assets Limited | Real estate | 2024 |
| Axions Technology Limited | Information & communication | 2023 |
| Axis EYE Alliance Ltd | Health & social care | 2026 |
| AY Fried Chicken Ltd | Hospitality | 2024 |
| AY Probation & Social Work Services Limited | Health & social care | 2018 |
| Aylesford Hand Car Wash Ltd | Other services | 2018 |
| Aylesham Community Trust | Information & communication | 1995 |
| Aylesham Family Butchers Ltd | Wholesale & retail | 2007 |
| Aylesham Heritage Community Interest Company | Arts & recreation | 2016 |
| Aylesham Sports Club Limited | Hospitality | 2025 |
| Aylesham Village (Barratt) Residents Management Company Limited | Households | 2019 |
| Azdio Technology Services Ltd | Information & communication | 2015 |
| Azizf Ltd | Wholesale & retail | 2024 |
| Azucar Treats Ltd | Manufacturing | 2021 |
| B & J Assessment Services LLP | | 2009 |
| B & M Property Services Limited | Construction | 2017 |
| B Bass Electrical Ltd | Construction | 2026 |
| B C & SON Brickwork Ltd | Construction | 2016 |
| B Doherty & Sons Ltd | Construction | 2011 |
| B S F Consulting Engineers Limited | Professional & scientific | 1989 |
| B YOU Salon Ltd | Other services | 2023 |
| B&B Coaching Ltd | Education | 2023 |
| B.Ch Services Kent Limited | Professional & scientific | 2017 |