| A-SKIP4U.COM (Kent) Limited | Water & waste | 2015 |
| A. Carter Developments Limited | Construction | 2025 |
| A.C. Powell Plumbing Services Limited | Construction | 2024 |
| A1 Scaffold Ltd | Construction | 2017 |
| A1 Service & MOT Centre Limited | Wholesale & retail | 2025 |
| A1K1 Ltd | Hospitality | 2023 |
| AA Clifton Super Store Ltd | Wholesale & retail | 2024 |
| AA Consultants Kent Ltd | Professional & scientific | 2015 |
| AA Tech Store Limited | Wholesale & retail | 2026 |
| AAA Accountancy Ltd | Financial services | 2015 |
| AAA Service's Kent Limited | Administrative & support | 2014 |
| AB Kent Ltd | Health & social care | 2019 |
| AB0268 Ltd | Hospitality | 2022 |
| ABA Services and Solutions Ltd | Education | 2023 |
| Abbey Dent Limited | Health & social care | 2015 |
| Abdo Home Improvements Limited | Construction | 2013 |
| Abdul & Co UK Limited | Wholesale & retail | 2025 |
| Abigail's Coffee Ltd | Hospitality | 2025 |
| Ability Renovation Limited | Manufacturing | 2022 |
| Able Holdings Limited | Financial services | 2024 |
| Abyssal Access. Limited | Wholesale & retail | 2026 |
| Accidentnavigator Ltd | Professional & scientific | 2015 |
| Accounting Services East Kent Limited | Professional & scientific | 2012 |
| Ace of Fades Mobile Barber Ltd | Other services | 2025 |
| Acerler Ltd | Hospitality | 2015 |
| Acmcateringsupplies Ltd | Wholesale & retail | 2025 |
| Acol Property Developments Limited | Construction | 2025 |
| Acoustic Tests Ltd | Professional & scientific | 2025 |
| ACR UK Holdings Ltd | Financial services | 2012 |
| Action Plus (UK) Ltd | Education | 2013 |
| ACY Air Conditioning & Refridgeration Ltd | Manufacturing | 2018 |
| ACY Fire and Security Systems Ltd | Administrative & support | 2019 |
| AD Cars Ltd | Wholesale & retail | 2025 |
| Adam Whitworth Financial Services Ltd | Administrative & support | 2017 |
| Adams Bailey Homes Limited | Real estate | 2025 |
| Adapt Estates Limited | Real estate | 2025 |
| Adapt Media Services Limited | Information & communication | 2023 |
| ADC Transport Ltd | Transport & logistics | 2025 |
| ADD Good Design Ltd | Manufacturing | 2024 |
| Addiction Health Service Ltd | Health & social care | 2019 |
| Addington Gore Property Rentals Limited | Real estate | 2022 |
| Aduramore Ltd | Transport & logistics | 2023 |
| Advance Clinician Solutions Ltd | Health & social care | 2021 |
| Advanced Sales and Marketing Ltd | Wholesale & retail | 2026 |
| Advanced Scaffold Safety Inspections Ltd | Construction | 2026 |
| Advantage Asset Management Ltd | Administrative & support | 2018 |
| Adventurize and Explore Ltd | Education | 2024 |
| Aedifi Design Ltd | Professional & scientific | 2023 |
| Aedifi Industrial Ltd. | Construction | 2022 |
| AEE Assets Ltd | Real estate | 2020 |
| Aegis Horizon Ltd | Financial services | 2025 |
| Aesthetics by DR Lorraine Kemp Ltd | Health & social care | 2019 |
| AEW Electrical Ltd | Extraterritorial | 2011 |
| AFL Projects Ltd | Professional & scientific | 2023 |
| African Caribbean Kidney Education Enterprise CIC | Health & social care | 2024 |
| AFS Fencing & Groundworks Ltd | Construction | 2019 |
| Afterparty Margate Ltd | Hospitality | 2025 |
| AGE UK Thanet Limited | Health & social care | 2013 |
| Aggi Christou Mortgages Ltd | Financial services | 2022 |
| Agile Corporation Ltd | Health & social care | 2020 |
| Agile Software Consultants Limited | Information & communication | 2011 |
| Agile Work Solutions Limited | Professional & scientific | 2025 |
| Agro Fresh Kent Ltd | Transport & logistics | 2022 |
| AH Homes Limited | Real estate | 2024 |
| AHK Studios Ltd | Information & communication | 2026 |
| AIA Kent Holdings Ltd | Real estate | 2021 |
| AIM4 Partnerships C.I.C. | Arts & recreation | 2011 |
| Airoscent Ltd | Wholesale & retail | 2024 |
| Aizen Digital Limited | Information & communication | 2012 |
| AJ Forward Thinking Limited | Education | 2018 |
| AJ Plumbing and Property Development Ltd | Construction | 2024 |
| AJ Sparks Landscaping and Maintenance Ltd | Administrative & support | 2021 |
| AJR Design and Build (Kent) Ltd | Construction | 2020 |
| AJR Design and Build Ltd | Construction | 2018 |
| AJR Design and Installation Ltd | Construction | 2023 |
| AJR Fundraising Ltd | Other services | 2025 |
| AK Consulting Kent Ltd | Professional & scientific | 2026 |
| AKO Consulting Ltd | Information & communication | 2023 |
| AKO Holdings Ltd | Wholesale & retail | 2020 |
| Akssr Limited | Wholesale & retail | 2011 |
| AL Mandinah Foods Limited | Wholesale & retail | 2016 |
| AL Solar Ltd | Construction | 2025 |
| Alamer Lifestyles Ltd | Other services | 2016 |
| Alb-Uk Property Services Limited | Real estate | 2019 |
| Albob Ltd | Information & communication | 2025 |
| Aleksandra Rafalska VFX Ltd | Information & communication | 2025 |
| Aleron Apparel Ltd | Wholesale & retail | 2025 |
| Aletheia Reviews Ltd | Health & social care | 2024 |
| Alexander Mason Homes Ltd | Real estate | 2024 |
| Alexander Motorcycles Limited | Wholesale & retail | 2002 |
| Alexander-Wallace Health Care Ltd | Professional & scientific | 2023 |
| Alexander-Wallace Ltd | Professional & scientific | 2021 |
| Alexander-Wallace Therapeutics Ltd | Professional & scientific | 2026 |
| Alexanders Rail Limited | Construction | 2019 |
| Alexandra Car Sales Ltd | Wholesale & retail | 2025 |
| Alexandra Flat Management Ltd | Real estate | 2024 |
| Alexandra Garage Kent Limited | Wholesale & retail | 2021 |
| Alexandra Motors & Tyres Limited | Wholesale & retail | 2024 |
| Alexandra Properties Kent Limited | Households | 2024 |
| Alexandra Watson Ltd. | Professional & scientific | 2016 |