| Ajax Building & Property Maintenance Limited | Construction | 2000 |
| AJF Property and Capital Ltd | Real estate | 2013 |
| Ajnunn Mortgage Solutions Ltd | Professional & scientific | 2017 |
| AK Support Services Ltd | Health & social care | 2019 |
| Akehurst ( Stonebond ) Limited | Real estate | 2021 |
| Akehurst Homes (Holt) Limited | Real estate | 2017 |
| Akehurst Homes Limited | Administrative & support | 2009 |
| AKL Properties Limited | Real estate | 2003 |
| AKS Contracting Ltd | Information & communication | 2024 |
| Alan Morgan Electrical Services Limited | Construction | 2002 |
| Alan Ruck & SON Limited | Construction | 2017 |
| Alberta Mechanical and Electrical Services Limited | Construction | 2024 |
| Albion Office Interiors Limited | Administrative & support | 1999 |
| Albion Place Company Management Limited | Real estate | 2018 |
| Albion Property Services (Kent) LLP | | 2013 |
| ALD Company (Kent) Limited | Other services | 2023 |
| Alendale Associates Ltd | Professional & scientific | 2019 |
| Alenti 2000 Limited | Wholesale & retail | 2017 |
| Aligned Infrastructure Consulting Ltd | Construction | 2026 |
| Alive Digital Limited | Administrative & support | 2019 |
| ALL Retreats Ltd | Administrative & support | 2023 |
| ALL Star Heating Ltd | Construction | 2020 |
| All-Trade Contractors Limited | Construction | 2006 |
| Allaber Business Consultancy Limited | Professional & scientific | 2024 |
| Allium Landscapes (South East) Ltd | Administrative & support | 2026 |
| Allsorts (Antiques, Vintage & Collectables) Ltd | Wholesale & retail | 2014 |
| Almack Scaffolding Ltd | Construction | 2025 |
| Aloceans Ltd | Transport & logistics | 2024 |
| Alon Interiors Limited | Wholesale & retail | 2009 |
| Alpollo Airconditioning Limited | Construction | 1996 |
| Altermeliora Limited | Information & communication | 2021 |
| Always Event Toilets Ltd | Administrative & support | 2022 |
| Ama.Bahia Ltd | Information & communication | 2018 |
| Amadea Counselling & Psychotherapy CIC | Health & social care | 2023 |
| Amanda Stockham Medical Reporting Ltd | Health & social care | 2024 |
| Amanda Stocks Publicity Ltd. | Extraterritorial | 2015 |
| Amazing 3D Goals Ltd | Education | 2021 |
| Amfs Kent Ltd | Wholesale & retail | 2022 |
| AMG Carpentry (SE) Ltd. | Manufacturing | 2015 |
| Amiga Maintenance and Management Limited | Professional & scientific | 2003 |
| Ammv Financials Limited | Professional & scientific | 2026 |
| Amore Living Limited | Real estate | 2017 |
| Amptech Industrial Electrical Ltd | Manufacturing | 2023 |
| Amtivo Cyber Limited | Administrative & support | 2004 |
| Amtivo Finco Limited | Financial services | 2018 |
| Amtivo Food & Packaging Limited | Other services | 2016 |
| Amtivo Group Limited | Professional & scientific | 2018 |
| Amtivo Health & Safety Limited | Professional & scientific | 2005 |
| Amtivo Midco Limited | Financial services | 2018 |
| Amtivo Services Limited | Financial services | 2021 |
| Amtivo Topco Limited | Financial services | 2018 |
| Amurrani Ltd | Financial services | 2025 |
| Andreia Professional UK Ltd | Wholesale & retail | 2024 |
| Andrew Crowe Consulting Group Limited | Transport & logistics | 2017 |
| Andrew Kennedy Communications Ltd | Professional & scientific | 2017 |
| Andrew Smith Jewellers Ltd | Wholesale & retail | 2016 |
| Andrews & Preston Ltd | Real estate | 2025 |
| Angel Souls CIC | Other services | 2024 |
| Angels Souls Ltd | Transport & logistics | 2023 |
| Angels Souls Rescue Dogs CIC | Other services | 2024 |
| Angels Souls Rescue Ltd | Transport & logistics | 2023 |
| Angie's Furniture Ltd | Manufacturing | 2014 |
| Angie’S Interiors Ltd | Manufacturing | 2022 |
| Angry Bear Limited | Real estate | 2018 |
| Anindya Niyogi Limited | Health & social care | 2022 |
| Anlujade Ltd | Construction | 2022 |
| Anthem (UK) Ltd | Professional & scientific | 1998 |
| Anthony Alan Brickwork Limited | Construction | 2019 |
| Anti Coach Limited | Administrative & support | 2024 |
| Antratec Services Ltd | Professional & scientific | 2021 |
| Anvita Technologies Limited | Administrative & support | 2016 |
| AO Investment Group Limited | Mining & quarrying | 2024 |
| Apex Credit Management Limited | Financial services | 2000 |
| Apluse Ltd | Professional & scientific | 2017 |
| Apogee Education, Learning and Development Limited | Education | 2017 |
| Applied Broadcast Systems Limited | Information & communication | 1987 |
| Aprb Investments Limited | Construction | 2025 |
| April Services Ltd | Construction | 2020 |
| April South Quay Limited | Administrative & support | 2017 |
| Aquarius Management Solutions Limited | Professional & scientific | 2015 |
| Aquatec Systems Limited | Wholesale & retail | 2021 |
| AR Spiers Holdings Limited | Financial services | 2022 |
| Arch Asset Managment Ltd. | Arts & recreation | 1998 |
| Area 30A Management Company Limited | Real estate | 2008 |
| Area 31 Kingshill (Keepers Field) Management Company Limited | Households | 2004 |
| Area 59 Kings Hill Estate Management Limited | Households | 2010 |
| Area Access Scaffolding Ltd | Construction | 2022 |
| Arich Consultancy Limited | Professional & scientific | 2024 |
| ARK Smile Ltd | Health & social care | 2011 |
| Arkham Developments Limited | Real estate | 2024 |
| Arlesey East LLP | | 2022 |
| Armadillo Entertainment Ltd | Information & communication | 2016 |
| Armanov Ltd | Construction | 2022 |
| Armrich UN Limited | Wholesale & retail | 2023 |
| Arrange a Viewing Limited | Real estate | 2021 |
| Art Investments UK Limited | Financial services | 2006 |
| Arterberry Capital Ltd | Real estate | 2019 |
| Arthur Volbrecht Traffic Solutions Ltd | Administrative & support | 2015 |
| Artisan Chromes Limited | Manufacturing | 2019 |
| Arun Builders Limited | Construction | 2011 |