| Andreivpa Ltd | Manufacturing | 2025 |
| Andrew Bligh Ltd | Administrative & support | 2017 |
| Andrew Grant Associates Ltd | Professional & scientific | 2014 |
| Andrew Greaves Public Affairs Limited | Professional & scientific | 2020 |
| Andrew Hankins Haulage Limited | Transport & logistics | 2018 |
| Andrew Hazell Consulting Ltd | Professional & scientific | 2025 |
| Andrew Judd Limited | Real estate | 2017 |
| Andrew Klimke Carpentry Ltd | Construction | 2015 |
| Andrew Klose Engineering Limited | Manufacturing | 2002 |
| Andrew Manning Limited | Manufacturing | 2005 |
| Andrew Prentice Limited | Professional & scientific | 2021 |
| Andrew Taylor Design Ltd | Professional & scientific | 2017 |
| Andrew Thorne and Company Limited | Construction | 2000 |
| Andrewbas Music Ltd | Information & communication | 2022 |
| Andrey & Dora Comp Ltd | Manufacturing | 2023 |
| Andrius Wholesale Ltd | Wholesale & retail | 2013 |
| Andromeda Capital Management (UK) LLP | | 2022 |
| Andromeda Capital Management Ltd | Financial services | 2022 |
| Andromeda Consultancy Limited | Information & communication | 1998 |
| Andy Brown Limited | Construction | 2010 |
| Andy Harvey Design Limited | Professional & scientific | 2025 |
| Andy Williams Consulting Limited | Professional & scientific | 2022 |
| Andy&Angel Limited | Real estate | 2017 |
| Andy's Hairworks Limited | Other services | 2016 |
| Andy's Test Centre Limited | Wholesale & retail | 2017 |
| Andypayne Ltd | Professional & scientific | 2025 |
| Anentropic Ltd | Information & communication | 2013 |
| ANG Oncology Ltd | Health & social care | 2024 |
| Angel Barbers Cambridge Ltd | Other services | 2024 |
| Angel Jackson Square Limited | Other services | 2025 |
| Angela Papadopoulos-Fortune Ltd Ltd | Professional & scientific | 2015 |
| Angelfield Homes Limited | Real estate | 1979 |
| Angelhart Solutions Limited | Information & communication | 2012 |
| Angelhood Ltd | Administrative & support | 2024 |
| Angelo Composites Ltd | Manufacturing | 2023 |
| Angelrodeo Healthcare Limited | Health & social care | 2025 |
| Anglia A.I. Ltd | Information & communication | 2018 |
| Anglia Cables and Parts Limited | Administrative & support | 2010 |
| Anglia Cabs Ltd | Transport & logistics | 2022 |
| Anglia Caravan Parks Limited | Real estate | 1967 |
| Anglia Cathodic Holding Limited | Financial services | 2016 |
| Anglia Cathodic Protection Services Limited | Professional & scientific | 1997 |
| Anglia Property Preservation Limited | Construction | 1967 |
| Anglia Ruskin Students' Union | Other services | 2012 |
| Anglian Dog Works Limited | Wholesale & retail | 2021 |
| Anglian Gates Ltd | Manufacturing | 2011 |
| Anglian Home Surveyors Ltd | Professional & scientific | 2014 |
| Anglian Intumescent Ltd | Construction | 2003 |
| Anglian Learning | Education | 2011 |
| Anglica Consultancy Ltd | Professional & scientific | 2025 |
| Angliear Hearing and Tinnitus Solutions Limited | Health & social care | 2016 |
| Anglo Australian Rice Limited | Professional & scientific | 1986 |
| Anglo Commerce International Ltd | Extraterritorial | 2025 |
| Anglo Deutsch Consulting Limited | Extraterritorial | 1993 |
| Angr Ltd | Professional & scientific | 2025 |
| Anhive Limited | Wholesale & retail | 2026 |
| Anidium Limited | Information & communication | 2015 |
| Anika Design Ltd | Wholesale & retail | 2025 |
| Anil Anand Ltd | Wholesale & retail | 2017 |
| Anima Records Ltd | Information & communication | 2024 |
| ANJ Private Ltd | Wholesale & retail | 2014 |
| Anjo Marketing Limited | Wholesale & retail | 2011 |
| Ankarasmith Creations Ltd | Manufacturing | 2025 |
| ANN & Aidan PVT Ltd | Transport & logistics | 2022 |
| ANN Pettengell Limited | Administrative & support | 2011 |
| Anna Moore Child Psychiatry Ltd | Health & social care | 2023 |
| Annaiyan UK Group Limited | Wholesale & retail | 2023 |
| Annaron Business and Accounting Services Ltd | Professional & scientific | 2025 |
| Annaur Investments LLP | | 2016 |
| Annaur Limited | Administrative & support | 2016 |
| Anne's Content House Limited | Professional & scientific | 2020 |
| Annesley Gandon Solutions Limited | Administrative & support | 2016 |
| Annie LEE Ltd | Manufacturing | 2023 |
| Annie O'Keefe Ltd | Professional & scientific | 2025 |
| Annsta Industrial Group Co., Ltd | Wholesale & retail | 2026 |
| Anotherco Limited | Other services | 2025 |
| Anritix Ltd | Information & communication | 2026 |
| Ansill Limited | Real estate | 2006 |
| Anspear Limited | Information & communication | 1993 |
| Anstey Hall Events Limited | Other services | 2011 |
| ANT Aviation Services Ltd | Manufacturing | 2024 |
| ANT MAN Productions Ltd | Arts & recreation | 2023 |
| Antai Ltd | Wholesale & retail | 2023 |
| Antarctic Heritage Ltd. | Wholesale & retail | 2005 |
| Antarctic Science | Professional & scientific | 2000 |
| Antares Trading Limited | Manufacturing | 2022 |
| Antas Limited | Agriculture & fishing | 1995 |
| Anthony Davies (Sales) Limited | Real estate | 2017 |
| Anthony Davies Property Group Ltd. | Real estate | 2011 |
| Anthony W Curtis Ltd | Hospitality | 2024 |
| Anthroenology Ltd | Professional & scientific | 2016 |
| Anthrope Limited | Professional & scientific | 2003 |
| Anthropos Experience Ltd | Administrative & support | 2018 |
| Anthropos Initiatives | Professional & scientific | 2025 |
| Anthropos Ltd | Administrative & support | 2013 |
| Anti-Hero Ltd | Arts & recreation | 2024 |
| Antibodies.Com Limited | Professional & scientific | 2015 |
| Antidote ENT Limited | Construction | 2025 |
| Antipodes Intelligence Ltd | Information & communication | 2024 |
| Antiquity Publications Limited | Information & communication | 1949 |