| AER Electrical Services Ltd. | Energy | 2018 |
| Aeropowr Limited | Manufacturing | 2026 |
| Aesir Ltd | Manufacturing | 2009 |
| Aesthetics by Chels Limited | Other services | 2022 |
| Affinity Multi Academy Trust | Education | 2012 |
| Agar Interiors Holdings Limited | Financial services | 2026 |
| Agar Interiors Limited | Construction | 2022 |
| AGF (Cambs) Ltd | Real estate | 2021 |
| Agri-Star UK Ltd | Wholesale & retail | 2020 |
| Agribee Ltd | Agriculture & fishing | 2022 |
| Agrigrub Ltd | Agriculture & fishing | 2018 |
| Agrimech Ltd | Manufacturing | 2009 |
| Agrimech Services Ltd | Extraterritorial | 2014 |
| AGV Machinery Services Limited | Manufacturing | 2002 |
| Agvantage UK Ltd | Wholesale & retail | 2020 |
| AHS Estimating Services Ltd | Professional & scientific | 2021 |
| AIG B&J 1 Ltd | Hospitality | 2023 |
| AIG Management Services Ltd | Financial services | 2024 |
| Aigatrans Limited | Transport & logistics | 2026 |
| Air North East Ltd | Real estate | 2018 |
| Air Swift Ltd | Energy | 2021 |
| Air Test East Anglia Limited | Construction | 2022 |
| Airbrush Mastery Limited | Arts & recreation | 2025 |
| Airforce Auto Rentals Ltd | Administrative & support | 2023 |
| Aiva Transport Ltd | Transport & logistics | 2018 |
| AJE Systems (UK) Limited | Agriculture & fishing | 2007 |
| AJS Bookkeeping Ltd | Administrative & support | 2021 |
| AJT Construction Services Ltd | Professional & scientific | 2019 |
| AKJ Utility Solutions Ltd | Water & waste | 2021 |
| Alan Boothby Limited | Health & social care | 2005 |
| Alan Clarke Electrical Ltd | Construction | 2012 |
| Alan G B Ltd | Arts & recreation | 2016 |
| Alan Hudson Limited | Agriculture & fishing | 1958 |
| Alasan Developments Limited | Construction | 2010 |
| Albany Total Waste Limited | Water & waste | 2017 |
| Alexandra Associates Limited | Professional & scientific | 1962 |
| Alexandrei Trans Limited | Transport & logistics | 2018 |
| Alfaparcel Ltd | Real estate | 2008 |
| Alfas Commercial Ltd | Wholesale & retail | 2018 |
| Alfas Mice Ltd | Wholesale & retail | 2024 |
| Algio Ltd | Transport & logistics | 2014 |
| Alibulk Systems Limited | Manufacturing | 2018 |
| ALL About YOU Hair & Beauty Ltd | Other services | 2011 |
| ALL Organic Ltd | Agriculture & fishing | 2025 |
| ALL Timber Infestation & Consultancy Services Limited | Construction | 1978 |
| ALL Time Catering Mobile Ltd | Hospitality | 2011 |
| Allcars (Sales) Limited | Wholesale & retail | 2019 |
| Allen’S Allsorts Ltd | Wholesale & retail | 2025 |
| Alleycat Car & Van Rental Limited | Administrative & support | 2002 |
| Allison's Stays & Property Ltd | Real estate | 2023 |
| Alliston Villa Management Limited | Extraterritorial | 2015 |
| ALN-13 Ltd | Transport & logistics | 2025 |
| Alpana Sengupta Dance Company | Arts & recreation | 2023 |
| Alpha Choice Construction Ltd | Manufacturing | 2024 |
| Alpine Dualit Limited | Financial services | 2021 |
| Altacera Limited | Information & communication | 2013 |
| Alteana Limited | Real estate | 2024 |
| Alyfar Transport Ltd | Transport & logistics | 2024 |
| ALZ Travel Ltd | Transport & logistics | 2014 |
| Amac Consultancy Limited | Financial services | 2014 |
| Amba Distribution Limited | Wholesale & retail | 2019 |
| Amber Staff Ltd | Administrative & support | 2017 |
| Amity Solutions Limited | Professional & scientific | 2003 |
| AMP Engineering Limited | Professional & scientific | 2025 |
| AMS Recovery Trucks Ltd | Wholesale & retail | 2022 |
| AMW Electrical Services Ltd | Construction | 2026 |
| AMY ANN Media Ltd | Information & communication | 2026 |
| Anabolic Beatz Limited | Information & communication | 2022 |
| Anatolijkun Limited | Transport & logistics | 2024 |
| Ancojada Limited | Administrative & support | 2020 |
| Andrew Clarke Contractors Limited | Construction | 2013 |
| Andrews Health Associates Ltd | Professional & scientific | 2017 |
| Andy Cooper Car Sales Limited | Wholesale & retail | 2019 |
| Andy R. Palmer Wealth Management Ltd. | Professional & scientific | 2016 |
| Anfoss Limited | Construction | 2005 |
| ANG Transport Limited | Transport & logistics | 2026 |
| Angels Kebab Wisbech Ltd | Hospitality | 2025 |
| Anglia Commercial Properties Limited | Real estate | 2021 |
| Anglia Community EYE Service Limited | Health & social care | 2005 |
| Anglia Components 2012 Limited | Financial services | 2012 |
| Anglia Components Investments Limited | Financial services | 2012 |
| Anglia Components PLC | Wholesale & retail | 2001 |
| Anglia Electrical Installations Ltd | Construction | 2008 |
| Anglia Growers Farming Limited | Agriculture & fishing | 2013 |
| Anglia Growers Limited | Agriculture & fishing | 2016 |
| Anglia Property Developments Ltd | Real estate | 2025 |
| Anglian Construction & Developments Ltd | Construction | 2020 |
| Anglian Electrical Solutions Ltd | Energy | 2015 |
| Anglian Network Solutions Limited | Information & communication | 2018 |
| Anglian Pest Control Limited | Other services | 2025 |
| Anglian Solar & Renewables Ltd | Construction | 2022 |
| Angus Utilities Limited | Construction | 2025 |
| Anouka Ltd | Other services | 2013 |
| Ansar (Supersound) Ltd | Manufacturing | 2019 |
| Antczak Cargo Ltd | Transport & logistics | 2016 |
| Antonoff Ltd | Hospitality | 2018 |
| Anything Electrical (UK) Limited | Construction | 2009 |
| AOG Property Holdings Ltd | Real estate | 2025 |
| Apex Fire Sprinklers Limited | Public administration | 2020 |
| Apex Holding & Investment Group Ltd | Financial services | 2026 |