| Andrew Webster Catering Ltd | Hospitality | 2020 |
| ANDRICI86 Ltd | Construction | 2023 |
| Andrzej Bobak Limited | Wholesale & retail | 2016 |
| Andrzej Morawka Limited | Wholesale & retail | 2015 |
| Andy Electricals and Plumbing Limited | Construction | 2012 |
| Andy Long Plastering Services Limited | Construction | 2010 |
| Andy Muskett Limited | Manufacturing | 2002 |
| Andy Total Cons Ltd | Construction | 2019 |
| Aneks Ltd | Health & social care | 2025 |
| Anero Consulting Ltd | Information & communication | 2011 |
| Anett SM Limited | Health & social care | 2023 |
| Angela's Properties Limited | Real estate | 2025 |
| Angelic Management Limited | Real estate | 2003 |
| Angleshades Consulting Ltd | Public administration | 2010 |
| Anglia Mobility Limited | Wholesale & retail | 1995 |
| Anglia VEG Limited | Wholesale & retail | 2018 |
| Anglian Cafe Limited | Hospitality | 2016 |
| Anglian Fasteners Limited | Wholesale & retail | 1969 |
| Anglian Rewinds (Bedford) Limited | Manufacturing | 2001 |
| Anglo Europe Limited | Construction | 2011 |
| Anglo Global Trading Limited | Wholesale & retail | 2019 |
| Anglo Pumps Limited | Manufacturing | 1989 |
| Angson Investments Ltd | Real estate | 2012 |
| Animal Welfare Limited | Professional & scientific | 2012 |
| Animazombs Ltd | Wholesale & retail | 2016 |
| Anitabox Ltd | Real estate | 2020 |
| Anje Amanda Limited | Construction | 2004 |
| Anje Properties (Holdings) Limited | Financial services | 2024 |
| Anjn Logistics Ltd | Transport & logistics | 2020 |
| ANK Logistics Ltd | Transport & logistics | 2025 |
| ANM Properties Management Ltd | Real estate | 2024 |
| ANN Wilson Ltd | Professional & scientific | 2021 |
| Anna Clare Bespoke Ltd | Manufacturing | 2025 |
| Anna French Associates Ltd | Professional & scientific | 2011 |
| Annabelletwist Ltd | Wholesale & retail | 2026 |
| Anne Archer Associates Limited | Professional & scientific | 2007 |
| Annelidia Ltd. | Agriculture & fishing | 2010 |
| Annexusev Limited | Administrative & support | 2021 |
| Annie S Consultancy Limited | Professional & scientific | 2022 |
| Annmat Holdings Limited | Real estate | 2003 |
| Anoop Court (Biggleswade) Limited | Households | 2018 |
| Anpr Technology Ltd | Information & communication | 2021 |
| ANR Assets Ltd | Real estate | 2025 |
| Anrol Consulting Ltd | Professional & scientific | 2022 |
| Ansam Services Ltd | Professional & scientific | 2018 |
| Ansamed Ltd | Health & social care | 2025 |
| Ansi Consulting Limited | Information & communication | 2018 |
| Ansley Efficient Ltd | Transport & logistics | 2014 |
| Answerlink Services Ltd | Administrative & support | 2004 |
| Answerpak Limited | Wholesale & retail | 1992 |
| Anther&Style Limited | Arts & recreation | 2014 |
| Anthony & Co Asset Management Ltd | Financial services | 2016 |
| Anthony Chambers Limited | Administrative & support | 2019 |
| Anthony Harvey Limited | Other services | 2003 |
| Anthony Kinns Aviation (Services) Limited | Manufacturing | 1990 |
| Anthos Ltd | Arts & recreation | 2018 |
| Antilia Ltd | Real estate | 2021 |
| Antiva Ltd | Professional & scientific | 2018 |
| Antonia B Service Limited | Agriculture & fishing | 2025 |
| Antonio Plant Operators Ltd | Construction | 2019 |
| Anumu Ltd | Health & social care | 2025 |
| Anush Technologies Limited | Information & communication | 2012 |
| ANY Design Ltd | Professional & scientific | 2017 |
| Anytime Recovery UK Ltd | Transport & logistics | 2025 |
| AOM Electronics Ltd | Professional & scientific | 2012 |
| AP Achieve Limited | Information & communication | 2003 |
| AP Clarity Limited | Professional & scientific | 2013 |
| AP Consulting Engineers Ltd | Professional & scientific | 2009 |
| AP Foods Ltd | Wholesale & retail | 2026 |
| AP Interstellar Ltd | Health & social care | 2024 |
| AP OSS Direct Limited | Other services | 2013 |
| AP Race Clinics Ltd | Arts & recreation | 2019 |
| AP Race Events Limited | Arts & recreation | 2022 |
| AP Race Multinational Ltd | Education | 2024 |
| AP Race Plus Ltd | Wholesale & retail | 2020 |
| APA Admin Ltd | Financial services | 2019 |
| Apaca Transport Ltd | Transport & logistics | 2022 |
| APB Investment Properties Ltd | Real estate | 2024 |
| APB Property Ltd | Construction | 2018 |
| APE Painting Ltd | Construction | 2019 |
| Apeks Global Ltd | Wholesale & retail | 2025 |
| Apex Air & Heat Ltd | Construction | 2026 |
| Apex Care Agency Ltd | Health & social care | 2022 |
| Apex Care Contracting Limited | Health & social care | 2020 |
| Apex Care Services Ltd | Health & social care | 2019 |
| Apex Care Support Services Ltd | Health & social care | 2023 |
| Apex Cleaning and Gardening Services Ltd | Health & social care | 2025 |
| Apex Commercial Consultants Limited | Professional & scientific | 2018 |
| Apex DST Limited | Wholesale & retail | 2020 |
| Apex Fire & Safety Ltd | Professional & scientific | 2025 |
| Apex Flat Roofing Ltd | Construction | 2022 |
| Apex Flooring Online Limited | Wholesale & retail | 2020 |
| Apex Global Enterprise Ltd | Wholesale & retail | 2024 |
| Apex Hospitality Group Ltd | Administrative & support | 2023 |
| Apex Liquidity Limited | Professional & scientific | 2025 |
| Apex Meadows Ltd | Real estate | 2025 |
| Apex Orbital Limited | Information & communication | 2026 |
| Apex Plus Ltd | Construction | 2022 |
| Apex Residentials Ltd | Real estate | 2020 |
| Apex Security Force Limited | Administrative & support | 2026 |