| Aksaray 68 Kent Ltd | Hospitality | 2026 |
| Albatross Eleven Limited | Professional & scientific | 2023 |
| Alca Tools Limited | Wholesale & retail | 1978 |
| ALD Brown Limited | Construction | 2018 |
| Alexander Environmental Systems Ltd | Construction | 2004 |
| Alexandra Residential Care Home Limited | Health & social care | 2024 |
| Alfiefba Limited | Wholesale & retail | 2025 |
| Align Health & Fitness Ltd | Arts & recreation | 2024 |
| Alkaflo Ltd | Manufacturing | 2017 |
| ALL About Beauty & Aesthetics Studio Limited | Other services | 2025 |
| ALL About Care Limited | Health & social care | 2003 |
| ALL Junk & Waste Limited | Wholesale & retail | 2023 |
| ALL Properties Ltd | Real estate | 2025 |
| ALL Seasons Travel Limited | Administrative & support | 2021 |
| Allbim NET Group Ltd | Information & communication | 2023 |
| Alma Prestige Ltd | Wholesale & retail | 2024 |
| Alphaware Limited | Real estate | 1996 |
| Alrcd Services Ltd | Administrative & support | 2011 |
| ALT Property Limited | Real estate | 2020 |
| Alulux Commercial Limited | Manufacturing | 2024 |
| Alulux Ltd | Manufacturing | 2015 |
| Alulux Trading Limited | Manufacturing | 2021 |
| AMA Construct Ltd | Construction | 2025 |
| Amazing Minds Centre for Learning Ltd | Education | 2024 |
| Ambition FAN Technology Limited | Manufacturing | 2007 |
| Ambulance Medical Group Ltd | Transport & logistics | 2021 |
| Amdtech Innovations Ltd | Professional & scientific | 2020 |
| AML Limited | Professional & scientific | 2020 |
| Anaya Assets Limited | Real estate | 2020 |
| Andrew D Wilkinson Limited | Real estate | 2013 |
| Andrew Stacey Limited | Construction | 2003 |
| Andrew Ward Photography Ltd | Professional & scientific | 2022 |
| Andrews & Elliott Limited | Manufacturing | 2000 |
| Anitas Trans Ltd | Transport & logistics | 2015 |
| Ankko Limited | Wholesale & retail | 2017 |
| ANN Carrington Limited | Arts & recreation | 2013 |
| Anna Bellissima Ltd | Administrative & support | 2022 |
| Anne Marie Court Residents Association Limited | Real estate | 2006 |
| Antenna Pro Limited | Wholesale & retail | 2005 |
| AP Crew & Transport Limited | Transport & logistics | 2022 |
| APB Ecology Ltd | Professional & scientific | 2026 |
| Apex Ventilations Limited | Construction | 2021 |
| Aphorist Studio Ltd | Manufacturing | 2025 |
| Appataxi Ltd | Transport & logistics | 2014 |
| Appleby-Meakins Limited | Real estate | 2018 |
| Appletree Dental Studio (Herne) Limited | Health & social care | 2010 |
| April Management Limited | Administrative & support | 2003 |
| Aqua Bay Properties Ltd | Hospitality | 2026 |
| Aquagas Whitstable Limited | Construction | 2012 |
| Aquilina Medical Services LLP | | 2012 |
| AR Threads Ltd | Wholesale & retail | 2025 |
| Arcade Emporium Ltd | Wholesale & retail | 2021 |
| Archbishop's Property Services Limited | Administrative & support | 2017 |
| Architecture and Technology Consultants Limited | Information & communication | 2024 |
| Archway Design Services Ltd | Professional & scientific | 2003 |
| Arclands Limited | Real estate | 2026 |
| Ardent Group 365 Limited | Information & communication | 1999 |
| Arnold Fire & Security Limited | Construction | 2018 |
| Arnold's Building Ltd | Construction | 2025 |
| Arodas Logistics Ltd | Wholesale & retail | 2021 |
| Artistic Textile Graphics | | 1993 |
| Arval Electronics Limited | Manufacturing | 1996 |
| ASL Vehicle Specialists Limited | Wholesale & retail | 2016 |
| Aspire Design Consultants Ltd | Construction | 2010 |
| Aspire Fostering Ltd | Health & social care | 2022 |
| Assets Together Management Limited | Households | 2026 |
| Assured Social Work Ltd | Health & social care | 2021 |
| Astrium Partnership Limited | Health & social care | 2020 |
| AT Dimension Engineering Limited | Professional & scientific | 2012 |
| AT Norwood Ltd | Real estate | 2023 |
| AT Norwood SUB Ltd | Real estate | 2025 |
| Atch Consulting Limited | Professional & scientific | 2019 |
| Atdomestic Limited | Administrative & support | 2015 |
| Athena Equity Limited | Real estate | 2025 |
| Attire Accounting Limited | Professional & scientific | 2014 |
| Audioenergy Limited | Administrative & support | 2001 |
| Audiopi Limited | Education | 2015 |
| Aura Beauty Studios Limited | Other services | 2022 |
| Aura Event Services Ltd | Administrative & support | 2011 |
| Auralena Limited | Professional & scientific | 2025 |
| Austen’S Outdoor Care Ltd | Administrative & support | 2026 |
| Austinmarley Construction Ltd | Construction | 2020 |
| Auto Jobbs Limited | Wholesale & retail | 2015 |
| Autocheck Faversham Ltd | Wholesale & retail | 2020 |
| Autumn Homes of Kent Limited | Construction | 2020 |
| Avenue Nursery & Forest School Limited | Education | 2007 |
| Avoca Star Limited | Professional & scientific | 2017 |
| AW Comms Ltd | Information & communication | 2026 |
| AW1 Building Specialist Limited | Construction | 2019 |
| AZ Accounts Ltd | Professional & scientific | 2024 |
| Azura Marketing Ltd | Professional & scientific | 2026 |
| B Welch Plumbing & Heating Ltd | Administrative & support | 2015 |
| B-Mór Mental Wealth Ltd | Education | 2024 |
| B15 Vintage Ltd | Wholesale & retail | 2022 |
| Badderbrook Carpentry and Construction Ltd | Construction | 2025 |
| Bakehouse 21 Ltd | Hospitality | 2021 |
| Bakerlew Hot Tubs and Spa's Ltd | Wholesale & retail | 2017 |
| Balcombe Group Electrical Limited | Construction | 2023 |
| Balcombe Group Investments Ltd | Real estate | 2025 |
| Balcombe Group Ltd | Construction | 2012 |