| Aifuture Group Ltd | Wholesale & retail | 2026 |
| AIM Wealth Ltd | Financial services | 2026 |
| Air SW Limited | Real estate | 2017 |
| Air-Seal Installations Limited | Wholesale & retail | 2019 |
| Air-Seal Products Limited | Wholesale & retail | 2000 |
| Airborne Activities Limited | Arts & recreation | 2018 |
| AIS Contract Cleaners Limited | Administrative & support | 2003 |
| Aisholt Consultancy Limited | Financial services | 2001 |
| AJ Hoskins Consulting & Development Ltd | Professional & scientific | 2018 |
| AJ Probate Services Ltd | Real estate | 2024 |
| AJ Raeburn Ltd | Professional & scientific | 2026 |
| AJB Plumbing & Heating Services Limited | Construction | 2005 |
| AJB Surveyors Ltd | Real estate | 2021 |
| AJE Services Ltd | Water & waste | 2020 |
| AJM Accountancy & Bookkeeping Ltd | Professional & scientific | 2010 |
| AJR & Associates Ltd | Professional & scientific | 2009 |
| AJS Williams Limited | Real estate | 2018 |
| AK Auto Rent Limited | Administrative & support | 2026 |
| AK Barber Taunton Ltd | Other services | 2025 |
| AK Developments (Taunton) Ltd | Construction | 2022 |
| AK Global Holdings Ltd | Extraterritorial | 2023 |
| AK Shopfitting & Carpentry Limited | Construction | 2009 |
| AKA Whittaker Limited | Education | 2015 |
| AKKURT68 Ltd | Hospitality | 2025 |
| AL Construction Engineering Ltd | Administrative & support | 2014 |
| AL Marinucci Limited | Financial services | 2025 |
| Alan Motors Car Body Repair Ltd | Wholesale & retail | 2024 |
| Alara Vural Coaching Ltd | Administrative & support | 2021 |
| Albatross (Taunton) Limited | Hospitality | 2018 |
| Albemarle Limited(The) | Hospitality | 1982 |
| Albermarle Trading Limited | Financial services | 2001 |
| Alberny Restorations Limited | Other services | 2004 |
| Albert Goodman 1 Limited | Extraterritorial | 2024 |
| Albert Goodman Audit LLP | | 2025 |
| Albert Goodman Corporate Finance Limited | Extraterritorial | 2016 |
| Albert Goodman Financial Planning Limited | Financial services | 1994 |
| Albert Goodman LLP | | 2010 |
| Albert Goodman Probate Limited | Other services | 2016 |
| Albert Goodman Trust Corporation Limited | Administrative & support | 2017 |
| Albert Goodman Trustee & Executor Company Limited | Other services | 2014 |
| Alberti Limited | Transport & logistics | 1993 |
| Albion Interactive Ltd | Information & communication | 2021 |
| Albion Running Limited | Arts & recreation | 2014 |
| Albion Water Holdings Limited | Water & waste | 2022 |
| Albion Water Limited | Water & waste | 1995 |
| Alby & Stone Ltd | Wholesale & retail | 2023 |
| Aldergrove Property Developments Limited | Real estate | 2003 |
| Alderson Consulting (Bristol) Ltd | Professional & scientific | 2018 |
| Aldon House Management Company Limited | Households | 2006 |
| ALE House 2020 Ltd | Hospitality | 2019 |
| Alerion Consulting Group Ltd | Professional & scientific | 2019 |
| Alex Hillenbrand Painting, Decorating and Renovation Ltd | Construction | 2015 |
| Alexandria Properties LLP | | 2007 |
| Alexis Taxi Ltd | Transport & logistics | 2025 |
| Alfies Construction Limited | Construction | 2025 |
| Alfies Landscapes Limited | Other services | 2016 |
| Alfies Outdoor Living Limited | Extraterritorial | 2026 |
| Alida Investments Ltd | Real estate | 2016 |
| Alinsky Limited | Professional & scientific | 2008 |
| Aliquot Ltd | Manufacturing | 2017 |
| Aliquot Solutions Limited | Information & communication | 1998 |
| Alison Courtney Acupuncture Limited | Health & social care | 2015 |
| Alistair Whiteley Web Design Limited | Information & communication | 2008 |
| Alkhatib Investment Ltd | Real estate | 2023 |
| ALL About Abuse Ltd | Health & social care | 2025 |
| ALL Saints Court RTM Company Limited | Households | 2006 |
| ALL Things Accessory Ltd | Wholesale & retail | 2013 |
| ALL Things Lettings Limited | Real estate | 2024 |
| ALL Wright Removals Ltd | Transport & logistics | 2024 |
| Allan Bowden Installations Limited | Construction | 2006 |
| Allegra-Consult Ltd | Professional & scientific | 2024 |
| Allen Construction Consultancy Limited | Professional & scientific | 2009 |
| Allen Pyke Associates Limited | Construction | 1995 |
| Allen Pyke Partnership Trustees Limited | Other services | 2019 |
| Allen Rentals Ltd | Real estate | 2019 |
| Aller Drove Ltd | Extraterritorial | 2016 |
| Allerford Consulting Limited | Professional & scientific | 2019 |
| Alleyford Limited | Construction | 2000 |
| Alli Mason Veterinary Rehabilitation Ltd | Professional & scientific | 2022 |
| Alliant Cyber Security Ltd | Information & communication | 2023 |
| Alliant Solutions Limited | Information & communication | 2025 |
| Allicsurd Limited | Information & communication | 2023 |
| Allied Healthcare Pro Ltd | Real estate | 2023 |
| Allied Scaffolding South West Limited | Administrative & support | 2013 |
| Allington Investments Ltd | Financial services | 2021 |
| Allis Properties Ltd | Real estate | 2023 |
| Allom Ltd | Real estate | 2017 |
| Allopen Zelhem Limited | Professional & scientific | 2014 |
| Allotment Fashion Ltd | Wholesale & retail | 2018 |
| Allsopp Holdings Collective Limited | Financial services | 2026 |
| Allthingsauto Limited | Wholesale & retail | 2025 |
| Alltimes Investments Limited | Construction | 2015 |
| Allure Capital Ltd | Financial services | 2021 |
| Allwood Buildings Ltd | Construction | 1992 |
| Allwood Timber Construction Limited | Construction | 2018 |
| Allwood Timber Frames Limited | Extraterritorial | 2008 |
| Alma Street Management Limited | Real estate | 2016 |
| ALMA17 Limited | Transport & logistics | 2017 |
| Alpcycles.Com Limited | Administrative & support | 2007 |
| Alpha Clothing Co. (Taunton) Limited | Wholesale & retail | 1998 |