| Abexon Ltd | Information & communication | 2022 |
| Abga Limited | Manufacturing | 2014 |
| ABH Energy LLP | | 2010 |
| Abhinaya Limited | Information & communication | 2023 |
| Abhistar UK Limited | Wholesale & retail | 2024 |
| ABI Brotherton Limited | Other services | 2015 |
| Abibabs Super Store Limited | Hospitality | 2025 |
| Abindustries Ltd | Wholesale & retail | 2026 |
| Abingerscott Limited | Professional & scientific | 2001 |
| Abital LP | | 2015 |
| Abivale Veterinary Group Limited | Extraterritorial | 2003 |
| Abjy Ltd | Health & social care | 2020 |
| ABK Intelligent Solutions Ltd | Information & communication | 2019 |
| Abkt Limited | Administrative & support | 2010 |
| ABL Barbering Ltd | Other services | 2023 |
| ABL Solutions Limited | Manufacturing | 2003 |
| Ablaze a Business Learning Action Zone for Education | Education | 2005 |
| Able Accountancy Services Ltd | Professional & scientific | 2020 |
| Able Accounting Bristol Ltd. | Transport & logistics | 2015 |
| Able Care Management Systems Limited | Hospitality | 2024 |
| Able Cleaning Limited | Administrative & support | 2005 |
| Able Consulting Solutions Limited | Professional & scientific | 2017 |
| Able Cottage Holidays Ltd | Hospitality | 2022 |
| Able Environmental Limited | Administrative & support | 2025 |
| Able Hands Ltd | Health & social care | 2020 |
| Able Investigations & Enforcement Services Limited | Administrative & support | 2020 |
| Able Investigations & Enforcement Solutions Limited | Administrative & support | 2010 |
| Able Investigations & Enforcements Limited | Administrative & support | 2012 |
| Able Response Training Limited | Health & social care | 2020 |
| Ablebeck Limited | Households | 1982 |
| Ablecom Limited | Real estate | 1989 |
| Ablectrics Limited | Wholesale & retail | 2016 |
| Ablerex Electronics U.K. Limited | Professional & scientific | 2009 |
| Abley Properties Limited | Real estate | 2019 |
| ABM Alliance Limited | Administrative & support | 2020 |
| ABM Brickworks Ltd | Construction | 2010 |
| ABM Ecology Ltd | Professional & scientific | 2022 |
| ABM Masonry Ltd | Construction | 2024 |
| Abng Property Ltd | Real estate | 2021 |
| Abode & Co-Apartments Ltd | Hospitality | 2022 |
| Abode & Co-Holdings Ltd | Real estate | 2022 |
| Abode & Co-Living Ltd | Real estate | 2020 |
| Abode and Co-Working Ltd | Real estate | 2022 |
| Abode Bathrooms Ltd | Construction | 2018 |
| Abode Brickwork & Construction Ltd | Construction | 2022 |
| Abode Design & Development Limited | Hospitality | 2003 |
| Abode EVO Ltd | Real estate | 2022 |
| Abode Number One Limited | Real estate | 2024 |
| Abode Property Management Holdings Limited | Real estate | 2018 |
| Abode Property Management Limited | Real estate | 2002 |
| Aboden Architectural Services Ltd | Professional & scientific | 2023 |
| Aboki PAY Ltd | Other services | 2026 |
| Aboodi Limited | Real estate | 2005 |
| Abou Care Limited | Health & social care | 2018 |
| About the Dog Ltd | Other services | 2022 |
| About the Grey Ltd | Professional & scientific | 2026 |
| Above and Beyond Circus Ltd | Education | 2024 |
| ABP Decorating Services Ltd | Construction | 2014 |
| Abpm Holdings Limited | Real estate | 2019 |
| ABR DK Limited | Other services | 2025 |
| Abraham C&S Limited | Health & social care | 2026 |
| Abraham Consulting Ltd | Information & communication | 2006 |
| Abraham.S.Constructions Limited | Construction | 2021 |
| Abrahams Builders Limited | Extraterritorial | 1966 |
| Abrdn New Dawn Investment Trust PLC | Financial services | 1989 |
| Abrichem Composite Limited | Manufacturing | 2003 |
| Abruzzo Properties Limited | Real estate | 2021 |
| ABS Food & Wine Limited | Wholesale & retail | 2022 |
| ABS Paintworx Ltd | Wholesale & retail | 2016 |
| ABS Steelfixing Ltd | Construction | 2022 |
| ABS SW Ltd | Construction | 2022 |
| Absentia Accounting Ltd | Professional & scientific | 2019 |
| Absg Property Ltd | Administrative & support | 2024 |
| Absinthe Enterprises Limited | Information & communication | 2005 |
| Absm Healthcare Ltd | Wholesale & retail | 2013 |
| Absm Holdings Ltd | Financial services | 2023 |
| Absm Investments Ltd | Financial services | 2020 |
| Absm Property Ltd | Real estate | 2020 |
| Absolute Air & Mechanical Ltd | Construction | 2022 |
| Absolute Care Bristol Ltd | Construction | 2007 |
| Absolute Care Management Ltd | Professional & scientific | 2019 |
| Absolute Construction Services (UK) Ltd | Construction | 2001 |
| Absolute Financial Advice Limited | Financial services | 2015 |
| Absolute H2O Limited | Administrative & support | 2007 |
| Absolute Hedges & Trees Ltd | Extraterritorial | 2024 |
| Absolute Lighting and Design Ltd. | Wholesale & retail | 2016 |
| Absolute Lock Service Ltd | Administrative & support | 2005 |
| Absolute Property Management Ltd | Real estate | 1997 |
| Absolutedream Limited | Hospitality | 2014 |
| Absolutely PC Limited | Information & communication | 2005 |
| Absolutely Pure and Wholesome Ltd | Information & communication | 2025 |
| Abstract Cat Ltd | Professional & scientific | 2024 |
| Abstraction Estates Ltd | Real estate | 2025 |
| ABT Corporate Finance Limited | Financial services | 2016 |
| Abtor Ltd | Wholesale & retail | 2015 |
| Abulia Limited | Professional & scientific | 2009 |
| Abundance Care Limited | Health & social care | 2022 |
| Abundance Medical Ltd | Health & social care | 2012 |
| Abundant Health Limited | Health & social care | 2021 |
| Abundant Life for ALL Christian Community | Health & social care | 2012 |