| Anchoris Pharma Limited | Professional & scientific | 2025 |
| Ancker Property Services Limited | Real estate | 2009 |
| AND Trading Ltd | Other services | 2019 |
| Andertech Servicing Company Ltd | Construction | 2026 |
| Andertech Tyres & Garage Ltd | Construction | 2026 |
| Andrea Heath Aesthetics Limited | Other services | 2019 |
| Andrei Iulian Mihai Limited | Extraterritorial | 2024 |
| Andrew Aston Ltd | Professional & scientific | 2019 |
| Andrew Durkan Ltd | Professional & scientific | 2011 |
| Andrew Holt Limited | Extraterritorial | 2012 |
| Andrew J Musson Limited | Wholesale & retail | 2007 |
| Andrew Knowles Property Investment Limited | Real estate | 2021 |
| Andrew Payne Ltd | Professional & scientific | 2011 |
| Andrew Perry Orthopaedics Ltd | Health & social care | 2011 |
| Andrew Pinning Limited | Real estate | 2013 |
| Andrew Rycroft Electrical Ltd | Construction | 2026 |
| Andrew Weekes Photography Ltd | Information & communication | 2012 |
| Andrew Whitehouse Limited | Education | 2020 |
| Andrews Property (Lincs) Limited | Real estate | 2018 |
| Andril Enterprises Limited | Extraterritorial | 2019 |
| Andruska Trans Limited | Transport & logistics | 2021 |
| Andy Aston Ltd | Professional & scientific | 2019 |
| Andy Blake Defence & Security Ltd | Public administration | 2025 |
| Andy Wilson Financial Services Ltd | Financial services | 2011 |
| Andy Yates Upvc Specialist Joiner Ltd | Construction | 2018 |
| Andycarrick Ltd | Information & communication | 2025 |
| Angel & Sons Ltd | Wholesale & retail | 2023 |
| Angel AK Property Ltd | Real estate | 2026 |
| Angel-Am Ltd | Hospitality | 2025 |
| Angelic Aromas Limited | Wholesale & retail | 2007 |
| Angelidi Management Consultancy Limited | Professional & scientific | 2023 |
| Anglers Limited | Hospitality | 2005 |
| Anglian Urology Associates LLP | | 2018 |
| ANI Medical Services Ltd | Health & social care | 2015 |
| Anik Ltd | Health & social care | 2018 |
| Animo Hospitality Ltd | Hospitality | 2026 |
| Animo Properties Ltd | Real estate | 2025 |
| Aniram Limited | Wholesale & retail | 2024 |
| Anmi Limited | Transport & logistics | 2026 |
| Anna O'Mara Ltd | Professional & scientific | 2025 |
| Annabel Jane Consulting Limited | Professional & scientific | 2020 |
| Anne Lindsay Deal Sourcing Limited | Real estate | 2024 |
| Anni Futures Ltd | Health & social care | 2026 |
| Anni-Academy Ltd | Real estate | 2024 |
| Annicare North Ltd | Administrative & support | 2018 |
| Annieducation Ltd | Education | 2025 |
| Annihub Ltd | Health & social care | 2025 |
| Annist-Kolanu Ltd | Health & social care | 2021 |
| Annistaff Ltd | Administrative & support | 2019 |
| Another Level Loft Conversions Limited | Construction | 2025 |
| Anser Medical Limited | Health & social care | 2009 |
| Antando Limited | Wholesale & retail | 2019 |
| Antarmi Limited | Other services | 1998 |
| Anteriad Global Limited | Professional & scientific | 2013 |
| Antevia Angels Limited | Information & communication | 2021 |
| Anthony Clark & Co Limited | Professional & scientific | 2015 |
| Anthony Gordon Consulting Ltd | Health & social care | 2022 |
| Anthony Jones Developments Ltd | Construction | 2022 |
| Anthony Sakellariou Ltd | Health & social care | 2009 |
| Anti Vandal Accomodation & Site Services Ltd | Wholesale & retail | 2022 |
| Antillon Capital Ltd | Professional & scientific | 2024 |
| Anube Ltd | Health & social care | 2024 |
| Anuva Brand Ltd | Financial services | 2025 |
| ANW Investments Limited | Real estate | 2018 |
| Anyplant Limited | Wholesale & retail | 1999 |
| Anywhere Live Limited | Information & communication | 2019 |
| AP Invest Ltd | Real estate | 2024 |
| AP Lettings (Lincoln) Limited | Real estate | 2018 |
| AP Property Development Ltd | Construction | 2012 |
| APB Driving Ltd | Transport & logistics | 2012 |
| APB Health Ltd | Health & social care | 2025 |
| APB Planning Limited | Professional & scientific | 2015 |
| Apcra Limited | Real estate | 2008 |
| Apex - Property Solutions Lincs Ltd | Construction | 2024 |
| Apex Bodyshop Lincoln Limited | Wholesale & retail | 2026 |
| Apex GAS Turbines Limited | Manufacturing | 2018 |
| Apex Group International Ltd | Professional & scientific | 2025 |
| Apex PCN Ltd | Health & social care | 2026 |
| Apex Training and Consultancy Services Ltd | Education | 2024 |
| Apex Training Ltd | Other services | 2008 |
| APF Brickwork Ltd | Construction | 2020 |
| APH Home Services Ltd | Households | 2026 |
| APH Property Services Ltd | Households | 2025 |
| Aphrodite Asset Management Limited | Financial services | 2026 |
| Apis Solutions Limited | Education | 2017 |
| APK Industries Limited | Wholesale & retail | 2009 |
| APL Insulation Ltd | Construction | 2026 |
| APM Medical Services Ltd | Health & social care | 2017 |
| Apms Property Ltd | Real estate | 2023 |
| Apmtm Services Limited | Administrative & support | 2017 |
| Apollo Mobility and Equipment Ltd | Wholesale & retail | 2024 |
| Apollo Solar Energy Ltd | Construction | 2022 |
| Apple 2015 Ltd | Administrative & support | 2015 |
| Apple Core Outreach (UK) Limited | Education | 2011 |
| Applied Materials Technology Limited | Manufacturing | 2002 |
| Appy Shop Ltd | Information & communication | 2018 |
| Apropos Training Limited | Administrative & support | 2003 |
| APS Holdings (UK Investments) Limited | Households | 2019 |
| APS Properties Limited | Construction | 2007 |
| APS Property Group Ltd | Real estate | 2018 |