| Amalua Ltd | Wholesale & retail | 2014 |
| Amandel Consulting Ltd | Professional & scientific | 2017 |
| Amara Mining (Cote D'Ivoire) Limited | Mining & quarrying | 2004 |
| Amara Mining Limited | Mining & quarrying | 2003 |
| Amaya Services Limited | Information & communication | 2020 |
| Amaze Select Ltd | Administrative & support | 2021 |
| Amber Building Solutions Limited | Construction | 2014 |
| Amber Design & Build Limited | Construction | 2013 |
| Amber Digital Consultants Limited | Wholesale & retail | 2017 |
| Amber Interiors Ltd | Construction | 2011 |
| Amber Maintenance Ltd | Extraterritorial | 2015 |
| Amber Residential Ltd | Construction | 2016 |
| Amco International Limited | Wholesale & retail | 2016 |
| AMF MEP Properties Ltd | Real estate | 2024 |
| AMG Autos Ltd | Wholesale & retail | 2026 |
| Amichem Limited | Wholesale & retail | 1987 |
| Amli Spaces Limited | Construction | 2024 |
| Amni Creative Ltd | Professional & scientific | 2026 |
| Amplified Schools Marketing Limited | Administrative & support | 2024 |
| Amroth Development Co. Limited | Financial services | 1980 |
| AMT + Co Ltd | Professional & scientific | 2014 |
| Amtech Engineering Services Ltd | Administrative & support | 2008 |
| AMV Developments Ltd | Real estate | 2026 |
| Amy's Lounge Limited | Other services | 2026 |
| Amy's Nails Kingston Limited | Other services | 2017 |
| An-Core Ltd | Extraterritorial | 2009 |
| Anadata Limited | Information & communication | 2020 |
| Analogic Computers (U.K.) Limited | Information & communication | 2017 |
| Analogic Holdings Limited | Information & communication | 1987 |
| Analytics-Link Limited | Information & communication | 2017 |
| Anar Ltd | Wholesale & retail | 2020 |
| Anatole Atlantic Holdings Limited | Financial services | 2026 |
| Ancha Properties Ltd | Real estate | 2026 |
| AND Designs Limited | Professional & scientific | 1997 |
| Andersen Property Investments Ltd | Real estate | 2019 |
| Anderson Hughes Limited | Information & communication | 2019 |
| Andreas D Nold Ltd | Information & communication | 2019 |
| Andreas Supplies Limited | Wholesale & retail | 2021 |
| Andrew Gardiner Art Director Limited | Arts & recreation | 2013 |
| Andrew Jackson Consulting Limited | Professional & scientific | 2023 |
| Andrew Rogers Associates Limited | Professional & scientific | 1995 |
| Andromeda AI Ltd | Information & communication | 2025 |
| Androulla Veliotou Limited | Administrative & support | 2007 |
| Anduma Intelligence Group Ltd | Information & communication | 2026 |
| Andy Ventures Ltd | Professional & scientific | 2023 |
| Andya Ltd | Transport & logistics | 2016 |
| Anela Ltd | Professional & scientific | 2022 |
| Angel Flooring Ltd | Construction | 2018 |
| Angel Nails Kingston Ltd | Other services | 2019 |
| Angela Gomez Comms & Sound Engineering Ltd | Professional & scientific | 2022 |
| Angelic Wisdom Ltd | Information & communication | 2019 |
| Angell Ventures Ltd | Real estate | 2022 |
| Angelo Campagna Architect Limited | Real estate | 2004 |
| Angels Bakery Ltd | Manufacturing | 2022 |
| Anglo African Corporation Limited | Professional & scientific | 2011 |
| Angus David Scott Ltd | Professional & scientific | 2020 |
| Angus Media Limited | Health & social care | 2021 |
| Anna Savill Physiotherapy Limited | Health & social care | 2006 |
| Anna Walker London Limited | Wholesale & retail | 2015 |
| Anna Wiscombe Limited | Wholesale & retail | 2016 |
| Anne LE Vaillant Limited | Administrative & support | 2015 |
| Anne Waldron Limited | Administrative & support | 2008 |
| Anneowenconsulting Limited | Professional & scientific | 2012 |
| Anther Brands Ltd | Professional & scientific | 2026 |
| Antipodean Telehealth Limited | Health & social care | 2024 |
| Antony James Jewellers Limited | Wholesale & retail | 2010 |
| Antony Marquis Professional Services Limited | Professional & scientific | 2012 |
| Anytime Pro Ltd | Information & communication | 2020 |
| AOK IT Ltd | Information & communication | 2017 |
| Aotearoa Health Ltd | Health & social care | 2025 |
| AP & S Asset Management Limited | Real estate | 2025 |
| Apache Consulting Services Limited | Professional & scientific | 2016 |
| Apache Management Limited | Professional & scientific | 2001 |
| Apbjackson Limited | Administrative & support | 2015 |
| Apex (Kingston) Management Company Limited | Administrative & support | 2005 |
| Apex Current Ventures Ltd | Financial services | 2025 |
| Apex FHM Limited | Professional & scientific | 2012 |
| Apex Gymnastics Ltd | Arts & recreation | 2024 |
| Apex Strategy Consulting Limited | Professional & scientific | 2024 |
| Apex Tiling Ltd | Construction | 2025 |
| Apexify Limited | Health & social care | 2023 |
| Aphro Ltd | Wholesale & retail | 2020 |
| Apna Land Ltd | Construction | 2013 |
| Apollo Dog Ventures Ltd | Professional & scientific | 2024 |
| Apple Market Ltd | Wholesale & retail | 2023 |
| Apple Tree Apartments Ltd | Real estate | 2026 |
| Appleton Company Services Limited | Other services | 1991 |
| Appleton Consultancy Services Limited | Professional & scientific | 2014 |
| Appleton Directors Limited | Administrative & support | 1991 |
| Appleton IDV Ltd | Financial services | 2024 |
| Appleton International LLP | | 2015 |
| Appleton Secretaries Limited | Administrative & support | 1991 |
| Applied Reasoning Limited | Information & communication | 2026 |
| Applied System Interiors Limited | Manufacturing | 2019 |
| Applorium Ltd | Information & communication | 2023 |
| APPS4BIZ Ltd | Information & communication | 2015 |
| Aprofyle Technologies Ltd | Information & communication | 2025 |
| APT Digital Ltd | Information & communication | 2021 |
| Aptg Limited | Administrative & support | 2000 |
| Aquarius Productions Ltd | Professional & scientific | 2018 |