| Adiele Group Limited | Real estate | 2020 |
| Adiescar Limited | Information & communication | 2024 |
| Adina Flowers Ltd | Wholesale & retail | 2018 |
| Aditi Solutions Ltd | Information & communication | 2025 |
| Adiva Catering Limited | Professional & scientific | 2021 |
| Adjanic Limited | Professional & scientific | 2025 |
| ADL Online Limited | Education | 2011 |
| Adlrs Estates Limited | Real estate | 2025 |
| ADM Interior Management Ltd | Other services | 2017 |
| Admiral NGU Ltd | Real estate | 2025 |
| Adorn Enterprises Ltd | Health & social care | 2026 |
| Adorn Jewels Ltd | Wholesale & retail | 2023 |
| Adornare Ltd | Administrative & support | 2026 |
| Adrian Soare Limited | Construction | 2018 |
| Adro Limited | Health & social care | 2025 |
| Adrola Limited | Construction | 2024 |
| ADS Carpentry Limited | Manufacturing | 2024 |
| Adskin Digital Media Limited | Information & communication | 2022 |
| Advancea Limited | Real estate | 1980 |
| Advanced Access Scaffolding Ltd | Construction | 2020 |
| Advanced Archive Storage Limited | Administrative & support | 2014 |
| Advanced Cargo Systems Limited | Transport & logistics | 1994 |
| Advanced Computer Solutions Limited | Information & communication | 1996 |
| Advanced Decorating (Bedfordshire) Ltd | Construction | 2013 |
| Advanced Electrical (UK) Limited | Construction | 1994 |
| Advanced General Precision Limited | Manufacturing | 2022 |
| Advanced Joinery Solutions Limited | Administrative & support | 1999 |
| Advanced Music Services Ltd | Education | 2019 |
| Advanced Supply Chain Ltd | Wholesale & retail | 2025 |
| Advancing People Limited | Administrative & support | 2009 |
| Advantage Schools | Education | 2010 |
| Advantos DJM Limited | Financial services | 2022 |
| Advantos IJC Limited | Financial services | 2021 |
| Advantos JDS Limited | Financial services | 2022 |
| Advantos UFM Limited | Financial services | 2023 |
| Adventus Innovation Limited | Financial services | 2018 |
| Adventus Partners Limited | Financial services | 2018 |
| Advise-Deta Limited | Manufacturing | 2015 |
| Advisextra Limited | Professional & scientific | 2023 |
| ADY Dowling Services Ltd | Construction | 2019 |
| Adyush Services Ltd | Health & social care | 2020 |
| Adze Woodwork Ltd | Manufacturing | 2025 |
| AE Sales Ltd | Other services | 2025 |
| AEB Construction & Management Service Ltd | Construction | 2025 |
| Aegios Health Ltd | Administrative & support | 2019 |
| Aegis Prime Engineering Ltd | Manufacturing | 2026 |
| Aelfric Court (Bedford) Limited | Hospitality | 1976 |
| Aequitas Associates Limited | Professional & scientific | 2017 |
| Aeramine Limited | Manufacturing | 2021 |
| Aereus Limited | Professional & scientific | 2013 |
| Aerodynamiq Ltd | Professional & scientific | 2022 |
| Aeromark Environmental Technologies Ltd | Extraterritorial | 2013 |
| Aerospace Technology Institute | Professional & scientific | 2013 |
| AES Electrical Wholesaler Ltd | Wholesale & retail | 2025 |
| Aesthetic Beauty Studio Ltd | Other services | 2024 |
| Aesthetic Source Holdings Limited | Financial services | 2024 |
| Aesthetic Source Limited | Health & social care | 2011 |
| Aestheticallypleasingbysb Ltd | Health & social care | 2024 |
| Aesthetics by Leannee Ltd | Other services | 2024 |
| Aesthetics by Marie Limited | Other services | 2019 |
| Aethetix Limited | Health & social care | 2019 |
| AEX VIV Limited | Transport & logistics | 2019 |
| Afarik Limited | Information & communication | 2022 |
| Afexs Limited | Administrative & support | 2009 |
| Affable Locums Ltd. | Administrative & support | 2020 |
| Affam Limited | Health & social care | 2024 |
| Affinity Premier Management Ltd | Education | 2024 |
| Affordable Car Centre Ltd | Other services | 2019 |
| Afgolf Store Limited | Extraterritorial | 2025 |
| AFJ Group Ltd | Transport & logistics | 2022 |
| Afloordable Limited | Wholesale & retail | 2026 |
| Afnh Property Limited | Real estate | 2022 |
| AFR Bedford Ltd | Hospitality | 2025 |
| African Family Heritage Hub CIC | Education | 2026 |
| Afridal Limited | Health & social care | 2014 |
| Afrobility Family CIC | Education | 2025 |
| AG IT Services Ltd. | Information & communication | 2013 |
| AGA Cabins Limited | Construction | 2023 |
| AGA Tiling Ltd | Construction | 2022 |
| Agagove Limited | Health & social care | 2017 |
| Agamemnon Estates Ltd | Real estate | 2009 |
| Agarda Ltd | Construction | 2020 |
| AGE Speed Group Ltd | Transport & logistics | 2024 |
| AGE UK Bedfordshire | Health & social care | 2001 |
| AGE UK Bedfordshire Trading Limited | Financial services | 2012 |
| Agemployment Limited | Administrative & support | 2006 |
| Agent Woburn Limited | Real estate | 2010 |
| Agents Holdings Limited | Professional & scientific | 2008 |
| Aggregate Movements Solutions Limited | Water & waste | 2012 |
| Aggregate Movements Southern Limited | Water & waste | 2023 |
| AGH Resourcing Limited | Professional & scientific | 2003 |
| Agile Steps Ltd | Information & communication | 2021 |
| Agilitech Solutions Ltd | Information & communication | 2014 |
| Agincourt 1415 Limited | Administrative & support | 2007 |
| AGM Bedford Motors Ltd | Wholesale & retail | 2019 |
| AGM Properties (London) Limited | Real estate | 2024 |
| Agma Property Investments Ltd | Real estate | 2024 |
| Agmir Catering Ltd | Hospitality | 2024 |
| Agms Energy Ltd | Extraterritorial | 2023 |
| Agms Independent Energy Ltd | Professional & scientific | 2009 |