| 10 Grove Park Management Limited | Real estate | 2008 |
| 167 London Road Freehold Company Limited | Real estate | 2025 |
| 1ST Call KB Aerials Limited | Information & communication | 2003 |
| 2 Streets Consulting Limited | Professional & scientific | 2022 |
| 27 Oast Limited | Financial services | 2017 |
| 30 Lansdowne Road Limited | Real estate | 2024 |
| 3LP Ltd | Households | 2018 |
| 44 Southwater Road RTM Company Limited | Households | 2023 |
| 46 Consulting Ltd | Information & communication | 2015 |
| 4CSL Limited | Information & communication | 2015 |
| 5 PIN Lighting Ltd | Professional & scientific | 2025 |
| 5 Trees Property Management Ltd | Households | 2020 |
| 54/56 Grove Hill Road Limited | Real estate | 2002 |
| 6IXTEEN Location House Limited | Real estate | 2014 |
| 6IXTEEN Properties Limited | Real estate | 2026 |
| 82MM Photography Limited | Professional & scientific | 2023 |
| A & R Roofing & Building Ltd | Construction | 2025 |
| A Friend of a Friend Ltd | Wholesale & retail | 2025 |
| A James Builders Limited | Construction | 2025 |
| A K Mathematical Solutions Ltd | Education | 2011 |
| A Taylor Scaffolding Ltd. | Construction | 2014 |
| A&J Builders & Developers Limited | Construction | 2020 |
| A.J. & C. Electrical Contractors Limited | Construction | 2002 |
| A.M. Smith Groundworks Limited | Construction | 2002 |
| AAC (Services) Southern Limited | Professional & scientific | 2013 |
| AAC Group Limited | Construction | 2017 |
| AAC Mechanical Services Limited | Energy | 2013 |
| AAM Kitchen Ltd | Hospitality | 2023 |
| AB Estate Rentals Ltd | Real estate | 2018 |
| Acer Plant Limited | Administrative & support | 2017 |
| Acer Projects Limited | Construction | 2017 |
| Acer Property (Kent) Limited | Real estate | 2021 |
| ACES4 Ltd | Other services | 2018 |
| Acland Publishing Ltd | Wholesale & retail | 2024 |
| Actotap Ltd | Construction | 2020 |
| Agrisoil Organics Limited | Wholesale & retail | 2026 |
| Ahed Consulting Ltd | Education | 2025 |
| Ai-Intellectual Limited | Information & communication | 2025 |
| AIM44 Limited | Information & communication | 2009 |
| Air Source Air Conditioning Ltd | Energy | 2025 |
| AIR2NRG Limited | Construction | 2009 |
| AJ Webster Logistics Ltd | Transport & logistics | 2025 |
| Ajewater Limited | Water & waste | 2025 |
| AK Garage Doors Limited | Administrative & support | 2000 |
| Albion Rebates Limited | Professional & scientific | 2026 |
| Aldeia International Limited | Professional & scientific | 2020 |
| Alex and ALL the Animals CIC | Other services | 2026 |
| Alfresco Pools Limited | Construction | 2018 |
| Alice Plant Hire Limited | Administrative & support | 2011 |
| Alikor Holdings Limited | Information & communication | 2020 |
| ALL Types of Weather Roofing Ltd | Construction | 2025 |
| Allen & Feldhaus Limited | Professional & scientific | 1997 |
| Alltra Building Services Ltd | Construction | 2025 |
| Almaden Rhee Limited | Professional & scientific | 2016 |
| Alpha Surveys Limited | Professional & scientific | 2009 |
| Also Business Services Limited | Administrative & support | 2015 |
| Alternative Waste Management Ltd | Water & waste | 2019 |
| Always Green Ltd | Construction | 2020 |
| Ambassador Consulting Ltd | Professional & scientific | 2022 |
| AMP Productions Limited | Agriculture & fishing | 1997 |
| Ampfinity Limited | Energy | 2025 |
| Amsbury Developments Limited | Construction | 2000 |
| Anglefield Construction Limited | Construction | 2003 |
| Anglefield Developments Limited | Construction | 2022 |
| Angley Equine Services Limited | Agriculture & fishing | 2016 |
| Angley Land and Property Management Limited | Real estate | 2015 |
| Animal Adventures Limited | Extraterritorial | 2011 |
| Animal Promotions Ltd | Agriculture & fishing | 2004 |
| Animal-Madhouse Ltd | Hospitality | 2021 |
| Anshan Limited | Information & communication | 2003 |
| Antidote Hospitality Ltd | Professional & scientific | 2024 |
| Apheleia Limited | Administrative & support | 2015 |
| Apnella Limited | Real estate | 2023 |
| Apple Business Centres Ltd | Professional & scientific | 2014 |
| Aquarius Trading Company Limited | Wholesale & retail | 1948 |
| Arena Link Ltd | Information & communication | 2025 |
| Arkitempo Limited | Financial services | 2019 |
| Arlingham Capital Limited | Professional & scientific | 2025 |
| Arvo Lithium Ltd | Mining & quarrying | 2022 |
| ARW Equine Services Ltd | Agriculture & fishing | 2023 |
| Arylyde Limited | Administrative & support | 2015 |
| Ascent Physio Ltd | Health & social care | 2026 |
| Ashford Model Railway Museum | Education | 2013 |
| Ashvale Construction & Developments Ltd | Construction | 2019 |
| Ashvale Construction Limited | Construction | 2008 |
| Ashwal Car Sales Limited | Wholesale & retail | 2019 |
| Asrij Limited | Professional & scientific | 2023 |
| Assisi Capital Founder LLP | | 2008 |
| Assisi Capital Limited | Financial services | 2008 |
| Assisi Capital LLP | | 2009 |
| Association of Computer Engineers | Information & communication | 2005 |
| Association of Computer Engineers and IT Professionals | Professional & scientific | 2004 |
| Association of Overseas Property Owners | Professional & scientific | 2021 |
| Association Payment and Credit Clearing Services | Professional & scientific | 2010 |
| Atel Properties Limited | Real estate | 2025 |
| Athanis International Ltd | Water & waste | 2024 |
| Atherall Plant Hires Limited | Construction | 2008 |
| Atlantic Jeepart Company Ltd | Wholesale & retail | 1999 |
| Atticus One Limited | Professional & scientific | 2007 |
| Attwood Academies | Education | 2014 |