| AG Investments Group Ltd | Financial services | 2020 |
| Aggregated Finance Solutions Limited | Financial services | 2021 |
| Agile Spray Response Ltd | Transport & logistics | 2017 |
| AGO X-Ray Limited | Professional & scientific | 2012 |
| Ainstey Drive (Sparkford) Management Company Limited | Households | 2005 |
| Air Cargo Movements Ltd | Transport & logistics | 2025 |
| Aircraft Coverings Limited | Wholesale & retail | 2017 |
| Airform Precision Sheet Metal Limited | Manufacturing | 2013 |
| Airwaves Communications (South West) Limited | Manufacturing | 1998 |
| AJ & WL Turner Limited | Agriculture & fishing | 2012 |
| AJ Horsington Property Limited | Real estate | 2017 |
| AJP Creations Ltd | Wholesale & retail | 2024 |
| AJW Finance Solutions Ltd | Professional & scientific | 2019 |
| AKM Limited | Construction | 2025 |
| AKW Service Ltd | Construction | 2016 |
| AL Chamberlain Ltd | Information & communication | 2019 |
| Alastair Macandrew Limited | Arts & recreation | 1998 |
| Albion Fasteners & Tools Ltd | Extraterritorial | 2024 |
| Albioncourt Trustees Limited | Professional & scientific | 2022 |
| Alderstow Ltd | Construction | 2012 |
| Aldridge Mechanical Limited | Construction | 2014 |
| Alexa&Robi Ltd | Wholesale & retail | 2026 |
| Alias Investments Ltd | Professional & scientific | 2025 |
| Alive Church Systems Ltd. | Administrative & support | 1995 |
| Alive HR Holdings Limited | Financial services | 2025 |
| Alive HR Limited | Administrative & support | 2006 |
| Alixir Industries Ltd | Wholesale & retail | 2026 |
| ALL Colour Envelopes Limited | Wholesale & retail | 2009 |
| ALL Dogs Have Dreams Ltd | Wholesale & retail | 2025 |
| ALL Entry Solutions Ltd | Manufacturing | 2024 |
| ALL Green (South West) Limited | Wholesale & retail | 2004 |
| ALL Round Roofing (SW) Ltd | Construction | 2024 |
| ALL TEN Fingers Limited | Arts & recreation | 2004 |
| Allania Ltd | Construction | 2021 |
| Allen Aviation Ltd | Transport & logistics | 2013 |
| Allen Computer Services Ltd | Information & communication | 2013 |
| Allentra Ltd | Professional & scientific | 2025 |
| Allglass & Glazing Limited | Construction | 1990 |
| ALM Inventory Services Ltd | Administrative & support | 2025 |
| Almar Home Improvements Ltd | Construction | 2012 |
| Alpz Limited | Hospitality | 2024 |
| Alternative Angles Business Consultancy Limited | Professional & scientific | 2001 |
| Altkoin Ltd | Health & social care | 2024 |
| Ambridge Estates Limited | Health & social care | 2007 |
| AMC Investigations Ltd | Administrative & support | 2024 |
| American Nails and Beauty SG Ltd | Other services | 2023 |
| Amicus Group Holdings Limited | Financial services | 2016 |
| Amicus Homecare Limited | Health & social care | 2010 |
| Amicus Homes Limited | Administrative & support | 2012 |
| Amicus Investment Company Limited | Financial services | 2026 |
| Amoure Limited | Administrative & support | 2018 |
| Ampx Group Ltd | Wholesale & retail | 2025 |
| Amtev Ltd | Agriculture & fishing | 2008 |
| ANA Maria Serban Ltd | Manufacturing | 2013 |
| Andrew COX Limited | Professional & scientific | 2001 |
| Andy Williams Driving Instructor Limited | Education | 2002 |
| Aneed Ltd | Health & social care | 2026 |
| Angel Nails Surrey Ltd | Other services | 2017 |
| Anicom Ltd | Construction | 2019 |
| Anilink Ltd | Other services | 2019 |
| Animal Control Officers Ltd. | Agriculture & fishing | 2016 |
| Anna Miller Ltd | Hospitality | 2012 |
| Annandale (Langport) Limited | Construction | 2019 |
| Annapuris Limited | Health & social care | 2024 |
| Annoying Logo Limited | Arts & recreation | 2015 |
| Anor Limited | Manufacturing | 2019 |
| Anor Living LLP | | 2018 |
| Another Little World Limited | Other services | 2019 |
| Anstey James Limited | Education | 2010 |
| Antiques and Lifestyle Centre Limited | Real estate | 2014 |
| AOO Specialist Indemnity Scheme Ltd | Professional & scientific | 2010 |
| AP Building Construction Limited | Construction | 2020 |
| AP Global Talent Limited | Administrative & support | 2008 |
| Aperitiv-Catering & Events Ltd | Hospitality | 2024 |
| Apex Clinical Care Ltd | Health & social care | 2026 |
| Apex Construction (SW) Ltd | Construction | 2014 |
| Apex Electrical (SW) Ltd | Construction | 2007 |
| Apple Bite Yeovil Limited | Hospitality | 2019 |
| Apple Orchard Builders Ltd | Construction | 2020 |
| Apple Tree Childrens Nursery (Yeovil) Limited | Administrative & support | 2005 |
| Appledoor Developments Limited | Construction | 2021 |
| APR Drainage Ltd | Water & waste | 2025 |
| Arabu Trans Ltd | Transport & logistics | 2025 |
| Arakou Limited | Information & communication | 2021 |
| ARC Developments (SW) Ltd | Construction | 2026 |
| Arcarpentry SW Ltd | Other services | 2014 |
| Architectural Metalwork Group Limited | Construction | 2021 |
| Arden Ltd | Professional & scientific | 2025 |
| Aresinnovations Limited | Information & communication | 2023 |
| Ariadne's Thread Limited | Information & communication | 2018 |
| Arimis Architectural Design Ltd | Professional & scientific | 2015 |
| Ariss Engineering and Consultancy Ltd | Professional & scientific | 2026 |
| ARJ Operations Ltd | Administrative & support | 2025 |
| ARK Global Ltd | Wholesale & retail | 2026 |
| ARK South Ltd | Construction | 2018 |
| Arkaba Services Limited | Health & social care | 2023 |
| Arlo Hawk Limited | Financial services | 2021 |
| Armando Construction Ltd | Construction | 2025 |
| ARO Logistics Limited | Transport & logistics | 2013 |
| Art and Beyond Ltd | Wholesale & retail | 2023 |