| Angalam Ltd | Information & communication | 2013 |
| Angazi Ltd | Extraterritorial | 2016 |
| Ange Healthcare Services Ltd. | Health & social care | 2022 |
| Angel Alerts Ltd | Information & communication | 2012 |
| Angel Fisher LLP | | 2023 |
| Angel Pavilion Ltd | Arts & recreation | 2020 |
| Angela Olivia Ltd | Transport & logistics | 2019 |
| Angelic Phoenix Limited | Wholesale & retail | 2024 |
| Angels Boutique Ltd | Wholesale & retail | 2020 |
| Anglezark Limited | Real estate | 2012 |
| Anglia Business Resources Limited | Professional & scientific | 1995 |
| Anglia City Developments Ltd | Real estate | 1970 |
| Anglia Logistics Ltd | Transport & logistics | 2018 |
| Anglian Autos Ltd | Wholesale & retail | 2022 |
| Anglian Press Limited | Manufacturing | 2010 |
| Anglian Willow Service Limited | Agriculture & fishing | 2007 |
| Anglo Trading Limited | Construction | 2022 |
| Angrad Limited | Health & social care | 2008 |
| Anigmar Solutions Limited | Construction | 2017 |
| Animal Fayre (2000) Ltd | Professional & scientific | 1999 |
| Animartransport Ltd | Transport & logistics | 2022 |
| Animated Expressions Limited | Arts & recreation | 1986 |
| Anjoli Music & Arts Academy Ltd | Education | 2026 |
| Anjuli Capital Limited | Real estate | 2015 |
| Anna Sampson Consulting Limited | Professional & scientific | 2022 |
| Annabel Flint Coaching Ltd | Professional & scientific | 2021 |
| Annamariapop Ltd | Public administration | 2023 |
| Anne Capital Group Ltd | Transport & logistics | 2026 |
| Anne's Pantry Ltd | Hospitality | 2019 |
| Annibale Group International Limited | Wholesale & retail | 2019 |
| Annli'Co Ltd | Wholesale & retail | 2019 |
| Annual Consulting Limited | Professional & scientific | 2023 |
| Another Level Medispa Limited | Other services | 2025 |
| Anqa Learning Ltd | Education | 2025 |
| Ansetts Scaffolding Ltd | Construction | 2017 |
| Anshu Homes Ltd | Real estate | 2021 |
| Ansjac (Holdings) Limited | Manufacturing | 1974 |
| Anstead Haulage Ltd | Transport & logistics | 2025 |
| ANT (GB) Limited | Manufacturing | 2009 |
| Antao Limited | Hospitality | 2026 |
| Antares Consulting Limited | Professional & scientific | 2025 |
| Anteridia Limited | Information & communication | 1998 |
| Anthony Freeman Limited | Other services | 2012 |
| Anthony Gerard Ltd | Construction | 2012 |
| Anthony James Group Build Ltd | Construction | 2024 |
| Anthony James Group Ltd | Construction | 2022 |
| Anthony Jane Limited | Professional & scientific | 2016 |
| Anthony Quirk Ltd | Real estate | 2022 |
| Antino & Associates Limited | Administrative & support | 2013 |
| Antom Accommodation Ltd | Real estate | 2021 |
| Anvime Consulting Ltd | Information & communication | 2011 |
| Anylocal Limited | Wholesale & retail | 2009 |
| AOM Construction Ltd | Professional & scientific | 2024 |
| AON Prop Ltd | Construction | 2019 |
| AON Property Management Ltd | Real estate | 2018 |
| AOT Professional Accountants Limited | Professional & scientific | 2024 |
| AP Choice Ltd | Wholesale & retail | 2020 |
| AP Wellness Ltd | Manufacturing | 2024 |
| APA Residential Limited | Real estate | 2022 |
| Apat Education Limited | Education | 2025 |
| Apax Property Investments Limited | Real estate | 2017 |
| APB Solutions Ltd | Construction | 2023 |
| APC Productions Limited | Information & communication | 1988 |
| APC Properties and Maintenance Ltd | Households | 2023 |
| Apcca Training Ltd | Education | 2022 |
| Apex Change Management Ltd | Information & communication | 2023 |
| Apex Drone Dynamics LLP | | 2025 |
| Apex Finishes Ltd | Construction | 2026 |
| Apex Fundrock Limited | Administrative & support | 2007 |
| Apex Maintenance & Property Management Ltd | Construction | 2025 |
| Apex Pro Solutions Ltd | Professional & scientific | 2026 |
| Apex PVT Ltd | Hospitality | 2022 |
| Apex Roaming Consulting Ltd | Professional & scientific | 2023 |
| Apex Talent Solutions Ltd | Administrative & support | 2018 |
| Apex Technical Services Ltd | Construction | 2022 |
| Apex Treats Limited | Hospitality | 2023 |
| Apex-Brimstone Ltd | Information & communication | 2015 |
| Apexpl Ltd | Real estate | 2021 |
| APM Engineering Design Limited | Professional & scientific | 2012 |
| Apollo Nails Studio Ltd | Other services | 2026 |
| Apothecary Coffee House Limited | Hospitality | 2005 |
| Apparel Collections Limited | Wholesale & retail | 2024 |
| Appetite Hospitality Ltd | Hospitality | 2017 |
| Appkazoo Limited | Information & communication | 2017 |
| Applewood Education Ltd | Education | 2025 |
| Applewood Learning Ltd | Education | 2025 |
| Applynowtv Limited | Information & communication | 2012 |
| Approved Windscreens Limited | Wholesale & retail | 1997 |
| Apptec 32 Limited | Information & communication | 2016 |
| APR Invest Ltd | Information & communication | 2011 |
| Aprile UK Limited | Transport & logistics | 2004 |
| APT Consult Limited | Information & communication | 2007 |
| Aptim Ltd | Manufacturing | 2023 |
| Aptitudetech Limited | Information & communication | 2022 |
| Apton Hall Events Limited | Other services | 2015 |
| Apts Consulting Limited | Professional & scientific | 2014 |
| Aptus Recruit Ltd | Administrative & support | 2025 |
| APX Core Ltd | Transport & logistics | 2025 |
| AQ2 Creative Ltd | Information & communication | 2011 |
| Aquaria Limited | Construction | 2018 |