| Affordable Eco Cleaners Limited | Administrative & support | 2025 |
| AGS Holdings SE Limited | Financial services | 2024 |
| Airbubble Whitstable Ltd | Real estate | 2022 |
| Airra Limited | Other services | 2023 |
| AL Residential Limited | Real estate | 2019 |
| Aladins Wunder Ltd | Information & communication | 2019 |
| Alaina Crystal Ltd | Professional & scientific | 2022 |
| ALB Accountancy Services Ltd | Professional & scientific | 2024 |
| Albaglen Limited | Households | 1987 |
| Albie and Pearl Limited | Wholesale & retail | 2025 |
| Alexander Lloyd Construction Ltd | Construction | 2023 |
| Algorithmica Limited | Information & communication | 2007 |
| Aligned Horizons Group Limited | Professional & scientific | 2026 |
| ALL About Asbestos Limited | Administrative & support | 2005 |
| ALL About Risk Limited | Professional & scientific | 2019 |
| ALL Hospitality Consulting Ltd | Hospitality | 2023 |
| ALL Saints Avenue Margate Management Company Limited | Households | 2005 |
| ALL Sorts of Sweets and Treats Ltd | Wholesale & retail | 2021 |
| Allied Tax and Accountancy Services Ltd | Professional & scientific | 2016 |
| Alpha Business Systems Ltd | Information & communication | 2013 |
| Alpha Sports Global Limited | Financial services | 2026 |
| Altered Gene Limited | Information & communication | 2013 |
| Alufresco Limited | Wholesale & retail | 2019 |
| Always a Solution Limited | Real estate | 2018 |
| AMA Lettings Limited | Real estate | 2016 |
| Amalfi Imports Ltd | Wholesale & retail | 2020 |
| AMJ Beach Limited | Construction | 2009 |
| Amlaki Limited | Financial services | 2020 |
| Amrak (Europe) Limited | Financial services | 2017 |
| Andrew Gaynord Ltd | Information & communication | 2024 |
| Andrew Gifford Ltd | Information & communication | 2025 |
| Andrew Sidney Ltd | Real estate | 2023 |
| Andys Airport Cars Limited | Transport & logistics | 2018 |
| Anglia Construction Ltd | Construction | 2026 |
| Annis Arts and Education Limited | Education | 2026 |
| Anouska Procter Ltd | Arts & recreation | 2014 |
| AOC Surrey Limited | Real estate | 2025 |
| Apex Utility Services Ltd | Construction | 2026 |
| Appro Digital Ltd | Information & communication | 2025 |
| Aqua Pure (Canterbury) Limited | Administrative & support | 2015 |
| Aravind Consultants Limited | Extraterritorial | 2013 |
| Arco Financial Ltd | Financial services | 2021 |
| Arcpool Limited | Water & waste | 2023 |
| Ariadne Titles Limited | Real estate | 2025 |
| Ariesque Limited | Construction | 2023 |
| Arklow Square Management Company Ltd | Households | 2020 |
| ARM Estate Control LLP | | 2006 |
| Armja Ltd | Hospitality | 2022 |
| Arnhem Knott Limited | Professional & scientific | 2008 |
| Art History Education Limited | Education | 2025 |
| ARW Counselling Limited | Health & social care | 2019 |
| Asbestos Coatings Environmentally Removed Limited | Extraterritorial | 2010 |
| Ascent Technologies Ltd | Information & communication | 2023 |
| Asel Catering Ltd | Hospitality | 2025 |
| Ashfaque Limited | Professional & scientific | 2008 |
| Ashley and Co Hair Lounge Limited | Other services | 2025 |
| Ashley's Jewellery Limited | Wholesale & retail | 2008 |
| Ashrafi Medical Services Ltd | Health & social care | 2023 |
| Asii Kent Ltd | Professional & scientific | 2016 |
| Askas Fenestra Limited | Wholesale & retail | 2019 |
| Aston Place Freehold Ltd | Extraterritorial | 2023 |
| Athwear Limited | Manufacturing | 2018 |
| Atkin Brickwork & Construction Ltd | Construction | 2026 |
| Attraxion Limited | Information & communication | 2025 |
| Atypical Types Limited | Information & communication | 2021 |
| Auntietracy Ltd | Real estate | 2021 |
| Aurelia Furniture International Limited | Other services | 2025 |
| Auronsam Limited | Professional & scientific | 2023 |
| Austin Myles Developments Ltd | Construction | 2016 |
| Autohub (Thanet) Limited | Wholesale & retail | 2024 |
| Automotive Auditing and Consultancy Services Ltd | Professional & scientific | 2018 |
| Autoprep Car Sales Limited | Wholesale & retail | 2023 |
| AVE House Ltd | Real estate | 2024 |
| Aviation Ground Operations Training Services Ltd | Transport & logistics | 2011 |
| Avondalecare (Kent) Limited | Health & social care | 2008 |
| AWD Soft Limited | Extraterritorial | 2023 |
| Awning Depot Ltd | Manufacturing | 2015 |
| AWP Jewellers EOT Limited | Financial services | 2025 |
| AWP Jewellers Limited | Wholesale & retail | 2004 |
| Azmes Limited | Health & social care | 2024 |
| B & L Carpentry Limited | Construction | 2020 |
| B G Supplies & Systems Limited | Professional & scientific | 2012 |
| Backer Life Limited | Other services | 2017 |
| Baconi Limited | Professional & scientific | 2014 |
| BAD Prophecy Games Limited | Information & communication | 2022 |
| Bailey & SON Services Limited | Wholesale & retail | 2008 |
| Bailey Printshop Ltd | Administrative & support | 2023 |
| Bailey Stocken Limited | Professional & scientific | 2019 |
| Bairds Hill Property Association Limited | Households | 1975 |
| Bakes by Jess Ltd | Manufacturing | 2024 |
| Balance Patch Ltd | Professional & scientific | 2026 |
| Bamptons Automation Limited | Real estate | 2023 |
| Bamptons Management Limited | Real estate | 2014 |
| Bamptons Valuations Limited | Administrative & support | 2017 |
| Baobab Education Ltd | Information & communication | 2026 |
| Barkada Broadstairs Ltd | Hospitality | 2022 |
| Barlesford Estates Limited | Real estate | 1976 |
| Barnes Marsland Solicitors Limited | Professional & scientific | 2013 |
| Base M Ltd | Administrative & support | 2012 |
| Baudouin UK Ltd | Manufacturing | 2020 |