| Anne Jury Associates Ltd | Professional & scientific | 2020 |
| Annes Herritage Services Limited | Health & social care | 2014 |
| Annis & O'Brien Ltd | Professional & scientific | 2015 |
| Annoworks Ltd | Transport & logistics | 2026 |
| Annpol Trading Limited | Administrative & support | 2011 |
| Annuity Express Ltd | Extraterritorial | 2014 |
| Anoinited Care Services Ltd | Real estate | 2013 |
| Anointed Hands Care Limited | Health & social care | 2016 |
| Anointed Hands Decorations and Events Planning Limited | Other services | 2019 |
| Anointed Hands Limited | Transport & logistics | 2012 |
| Anointing Power Ltd | Transport & logistics | 2025 |
| Anokyewaa Kitchen Limited | Other services | 2020 |
| Anoosha IT Consulting Ltd | Information & communication | 2018 |
| Anosha Limited | Professional & scientific | 2015 |
| ANOTHER9 (U.K.) Limited | Information & communication | 2014 |
| Anova Project Consultants Ltd | Wholesale & retail | 2016 |
| ANP Acquisitions Limited | Professional & scientific | 2018 |
| ANS Bristol Ltd | Manufacturing | 2010 |
| Ansah & Associates Ltd | Professional & scientific | 2024 |
| Anscoom Stone Property Ltd | Real estate | 2021 |
| Ansell Electrical Ltd | Construction | 2025 |
| Ansell Mechanical Ltd | Construction | 2000 |
| ANT Duncan Photography Limited | Professional & scientific | 2014 |
| ANTAL1935 Limited | Transport & logistics | 2013 |
| Antelco UK Limited | Wholesale & retail | 2010 |
| Anthea Grace Studios Limited | Manufacturing | 2025 |
| Anthemis Group Operations Limited | Administrative & support | 2016 |
| Anthmonic Ltd | Information & communication | 2025 |
| Anthony Consult Limited | Health & social care | 2025 |
| Anthony Emmanuel Ltd | Wholesale & retail | 2017 |
| Anthony Gerard Mcdonnell Ltd | Wholesale & retail | 2024 |
| Anthony Lbgc Ltd | Wholesale & retail | 2020 |
| Anthony Transport & Logistics Ltd | Transport & logistics | 2024 |
| Anthropologie Japan Limited | Information & communication | 2011 |
| Anti Social Butterfly Limited | Wholesale & retail | 2026 |
| Antil's Private Limited | Real estate | 2025 |
| Antique Endeavors Ltd | Wholesale & retail | 2022 |
| Antiques on High Lake District Ltd | Real estate | 2020 |
| Antiques on High Sidmouth Ltd | Real estate | 2018 |
| Antodev Ltd | Information & communication | 2021 |
| Antolux Services Limited | Transport & logistics | 2025 |
| Antonia Capital Limited | Real estate | 2026 |
| Antonia Enterprise Systems Limited | Information & communication | 2026 |
| Antony Driver Construction Limited | Construction | 2010 |
| Antwi's Courtesy Ltd | Health & social care | 2025 |
| Anude Studio Ltd | Wholesale & retail | 2025 |
| Anulog Power and Data Solutions Ltd | Information & communication | 2024 |
| Anurag Jalota Consultancy Ltd | Information & communication | 2021 |
| Anvi Technologies Limited | Information & communication | 2013 |
| Anvin IT Ltd | Information & communication | 2018 |
| Anvyl Safety Floors Limited | Construction | 2005 |
| ANY Spec Limited | Extraterritorial | 2016 |
| ANY2D Limited | Wholesale & retail | 2025 |
| AO Catalyst Limited | Administrative & support | 2015 |
| AO Ventures Limited | Professional & scientific | 2025 |
| Aoao Limited | Wholesale & retail | 2021 |
| AOE Services Ltd | Other services | 2023 |
| Aojise Ltd | Transport & logistics | 2026 |
| AON Management Limited | Professional & scientific | 2002 |
| Aora Trans Ltd | Administrative & support | 2025 |
| AOS Consulting Limited | Professional & scientific | 2013 |
| AOS Services and Consultancy Limited | Professional & scientific | 2018 |
| Aoto Electronics (UK) Limited | Administrative & support | 2013 |
| AP Infinite Properties Ltd | Real estate | 2026 |
| AP Landscapes & Property Maintenance Limited | Construction | 2021 |
| AP Otamansbuilders Constructions Ltd | Construction | 2022 |
| AP Patel Homes Ltd | Real estate | 2023 |
| APA Secure Ltd | Administrative & support | 2020 |
| Apap Logistics Limited | Transport & logistics | 2023 |
| Apastron Aviation Ltd | Manufacturing | 2020 |
| Apct Consulting Limited | Information & communication | 2026 |
| Apertech Limited | Professional & scientific | 1998 |
| Apex Accountancy Services Limited | Professional & scientific | 1993 |
| Apex Bathrooms & Interiors Ltd | Construction | 2019 |
| Apex Building MK Limited | Construction | 2025 |
| Apex Building Solutions MK Ltd | Construction | 2024 |
| Apex Business Systems Limited | Information & communication | 2006 |
| Apex Consulting GRP (Group) Limited | Professional & scientific | 2025 |
| Apex Craft Builds Ltd | Construction | 2026 |
| Apex Digs Limited | Real estate | 2019 |
| Apex Funding Solutions Ltd | Financial services | 2019 |
| Apex Harbour Ltd | Extraterritorial | 2024 |
| Apex Kavi Ltd | Wholesale & retail | 2025 |
| Apex Manufacturing Ltd | Manufacturing | 2022 |
| Apex Planning Consultants Limited | Professional & scientific | 2012 |
| Apex Pro Wrestling Ltd | Arts & recreation | 2018 |
| Apex Projects (UK) Ltd | Manufacturing | 2007 |
| Apex Projects Holdings Ltd | Financial services | 2023 |
| Apex Real Estate Advisors LLP | | 2025 |
| Apex Sports Marketing Limited | Professional & scientific | 2014 |
| Apex Staffing Solutions Limited | Administrative & support | 2022 |
| Apex Tax and Accounting Service Limited | Professional & scientific | 2020 |
| Apexfield Consulting Limited | Professional & scientific | 2025 |
| Aphira Limited | Information & communication | 2021 |
| API Consulting (Ceased) Limited | Professional & scientific | 2010 |
| Apinke IFE Limited | Manufacturing | 2026 |
| Apinks Concepts Arts and Skills CIC | Education | 2025 |
| APL Communications Limited | Information & communication | 2005 |
| Apley Park Management Limited | Households | 2005 |
| Apmum Ltd | Wholesale & retail | 2025 |