| Andy Scott Ltd | Administrative & support | 2016 |
| Aneela Asghar Ltd | Wholesale & retail | 2025 |
| Aneesa's Ltd | Extraterritorial | 2009 |
| Anfitest Limited | Manufacturing | 2025 |
| Ang&Co Limited | Hospitality | 2024 |
| Angel and Luca Ltd | Other services | 2025 |
| Angel Applications Limited | Information & communication | 2022 |
| Angel Nails Bar Ltd | Other services | 2017 |
| Angel Refrigeration NE Ltd | Manufacturing | 2025 |
| Angel Skin Products Ltd | Wholesale & retail | 2015 |
| Angel Star Trading Ltd | Hospitality | 2022 |
| Angel Tech (NCL) Limited | Other services | 2024 |
| Angela Charlton Consultancy Ltd | Professional & scientific | 2025 |
| Angela Kapoor Limited | Households | 2014 |
| Angela's Healing Spa & Massage Ltd | Other services | 2024 |
| Angelbond Limited | Manufacturing | 1983 |
| Angeli VIJ Ltd | Administrative & support | 2015 |
| Angelic Informatics Ltd | Information & communication | 2013 |
| Angelmoon Enterprises Limited | Manufacturing | 2005 |
| Angletain Limited | Professional & scientific | 2008 |
| Anglian BUS Limited | Transport & logistics | 1976 |
| Anglican International Development Ltd | Extraterritorial | 2008 |
| Anglo French Law Group Ltd | Professional & scientific | 2017 |
| Anglo French Lawyers Ltd | Professional & scientific | 2009 |
| Anglo Pizza Ltd | Hospitality | 2025 |
| Anglo-French Surveyors Limited | Construction | 2012 |
| Angora Newcastle Ltd | Hospitality | 2026 |
| ANH Pizza Leith Ltd | Hospitality | 2022 |
| ANH Pizza Whitley Bay Ltd | Hospitality | 2022 |
| Animal Lottery Foundation CIC | Arts & recreation | 2026 |
| Anira Ltd | Wholesale & retail | 2019 |
| ANJ Property Ltd | Households | 2019 |
| Anketell Training Limited | Information & communication | 1998 |
| ANM 1992 Investments Limited | Financial services | 2026 |
| Anmz TT Ltd | Wholesale & retail | 2026 |
| Anna Brand Creative Ltd | Professional & scientific | 2010 |
| Anna Robinson Ltd | Arts & recreation | 2022 |
| Annan House Consultants Ltd | Professional & scientific | 2022 |
| Annick Benningen Limited | Professional & scientific | 2024 |
| Annie Foods Limited | Hospitality | 2025 |
| Annie Hood Limited | Wholesale & retail | 2014 |
| Annrose Consulting Ltd | Information & communication | 2023 |
| Anonymous Properties Limited | Real estate | 2025 |
| Another Sky Psychology Services Ltd | Education | 2025 |
| ANR Efficiency Limited | Other services | 2024 |
| ANS021 Limited | Administrative & support | 2025 |
| Anser Trading Ltd | Wholesale & retail | 2025 |
| Anshin Security Limited | Administrative & support | 2020 |
| Anson Diamond Limited | Extraterritorial | 2024 |
| Anson House 10 Limited | Hospitality | 2021 |
| Anson House 13 Limited | Hospitality | 2022 |
| Anson House 6 Limited | Professional & scientific | 2021 |
| Anstee Medical Services Limited | Professional & scientific | 2023 |
| Anta Solutions Ltd | Professional & scientific | 2022 |
| Antep Pizza Gazi Ltd | Hospitality | 2019 |
| Anthony Clegg Electrical Services Ltd | Construction | 2024 |
| Anthony P. Davies Associates Limited | Professional & scientific | 1995 |
| Anti Counterfeiting and Compliance Group Ltd | Wholesale & retail | 2025 |
| Anton Lang Planning Services Limited | Professional & scientific | 2008 |
| ANU Construction Ltd | Construction | 2025 |
| Anum Ltd | Transport & logistics | 2021 |
| ANY Student Homes Limited | Households | 2017 |
| ANY2 Properties Limited | Real estate | 2025 |
| Anzok Ltd | Real estate | 2016 |
| AO Stays Ltd | Real estate | 2024 |
| AOE Parcels Ltd | Transport & logistics | 2025 |
| Aosv Guard Services Ltd | Administrative & support | 2025 |
| AP (NE) Electrical Contractors Limited | Construction | 2016 |
| AP Chau Village Association (UK) | Arts & recreation | 1995 |
| AP Living Limited | Health & social care | 2022 |
| APA Building & Joinery Ltd | Construction | 2023 |
| Apadana Projects Ltd | Construction | 2025 |
| Apartheize Logistics Limited | Transport & logistics | 2025 |
| Apartment 1 Limited | Hospitality | 2003 |
| Apartment NO2 Limited | Wholesale & retail | 2025 |
| Apates Solutions UK Ltd | Wholesale & retail | 2022 |
| APE Team Ltd | Arts & recreation | 2017 |
| Aperia Limited | Administrative & support | 2003 |
| Aperture Energy Ltd | Real estate | 2024 |
| Apex Business and Management Consultants Ltd | Administrative & support | 2011 |
| Apex Design and Development Ltd | Construction | 2025 |
| Apex Joinery & Flooring Ltd | Construction | 2016 |
| Apex Office Cleaning Company Limited | Professional & scientific | 1973 |
| Apex Renewables North East Limited | Energy | 2024 |
| Apex Roofing Specialists Limited | Construction | 2017 |
| Apex Scaffolding NE Ltd | Construction | 2019 |
| Apex the Loft Conversion Specialists Ltd | Construction | 2017 |
| Apexx Motors Ltd | Wholesale & retail | 2025 |
| APG Mobile Mechanic Ltd | Wholesale & retail | 2025 |
| APH Commercial Finance Ltd | Financial services | 2021 |
| APH GAS & Electrical Services Ltd | Construction | 2023 |
| Apidemy Ltd. | Information & communication | 2017 |
| APM Automotive International (UK) Ltd | Professional & scientific | 2020 |
| APM Renewables Ltd | Construction | 2017 |
| Apna Golf Ltd | Arts & recreation | 2024 |
| Apodini Creations Limited | Arts & recreation | 2024 |
| Apogie Staffing Limited | Education | 2015 |
| Apollo Handling Limited | Manufacturing | 1972 |
| Apollo Impact Compass Limited | Information & communication | 2023 |
| Apollo Minerals (UK) Limited | Financial services | 2017 |