| A C Fraser Ltd | Professional & scientific | 2016 |
| A C Mole LLP | | 2023 |
| A Different Path Limited | Arts & recreation | 2019 |
| A Ditech Technical Solutions Ltd | Administrative & support | 2024 |
| A Finance Ltd | Financial services | 2012 |
| A FRY Plumbing & Heating Limited | Construction | 2019 |
| A G S Building Services (Taunton) Limited | Construction | 2000 |
| A G S Holdings (Taunton) Limited | Financial services | 2024 |
| A Gardner Property Services Limited | Other services | 2015 |
| A J Hale & SON Limited | Construction | 2003 |
| A J Mcleish Limited | Health & social care | 2026 |
| A J Williams Electrical Ltd | Construction | 2017 |
| A K Bates Limited | Health & social care | 2009 |
| A Labour of Giants Ltd | Information & communication | 2013 |
| A Little Space SW Ltd | Households | 2025 |
| A M Domestic Services Limited | Construction | 2011 |
| A M Ruthven & Associates Limited | Financial services | 2003 |
| A Mcewen Smith Agricultural and Commercial Contracting Limited | Construction | 2023 |
| A Miah Trading Limited | Hospitality | 2019 |
| A Pizza Heaven Ltd | Hospitality | 2026 |
| A Plus Living Ltd | Real estate | 2025 |
| A Product of Malitsky Limited | Information & communication | 2013 |
| A R B Mobility Ltd | Wholesale & retail | 2022 |
| A R Van DEN Boogaard Stamrecht Limited | Professional & scientific | 2009 |
| A S G Autos Limited | Wholesale & retail | 2007 |
| A Thyme to Gather Ltd | Professional & scientific | 2025 |
| A&J Mosley Accounting Services Limited | Professional & scientific | 2020 |
| A-Door Solutions (SW) Limited | Administrative & support | 2024 |
| A. Croot Enterprise Ltd | Financial services | 2024 |
| A. J. Raucki & SON Limited | Construction | 2009 |
| A. M. & R Psychiatric Consultancy Limited | Professional & scientific | 2012 |
| A. Stewart Plumbing & Heating Services Limited | Construction | 2026 |
| A.A.E.A.J. Claessen Limited | Professional & scientific | 1996 |
| A.C. Mole & Sons Limited | Extraterritorial | 2005 |
| A.C.T. Healthcare and Training Services PVT Ltd | Health & social care | 2014 |
| A.E. Securities Limited | Real estate | 2000 |
| A.G.Mercer Ltd | Professional & scientific | 2007 |
| A.G.S Property Ltd | Professional & scientific | 2012 |
| A.R. Yorke Limited | Administrative & support | 2004 |
| A.R.M.S. Plant Limited | Manufacturing | 2009 |
| A.S.A.P. Staff (SW) Limited | Hospitality | 2004 |
| A.S.C. Management Europe Limited | Administrative & support | 2011 |
| A.S.L. Radiology Limited | Health & social care | 2011 |
| A.W.E Catering Ltd | Hospitality | 2026 |
| A.W.E Security Options Limited | Administrative & support | 2021 |
| A1 Investments Ltd | Real estate | 2025 |
| A1 Property Holdings Ltd | Financial services | 2015 |
| A1 Windows & Doors Limited | Construction | 2000 |
| A2 Prime Property Ltd | Real estate | 2026 |
| A2A Taxis Ltd | Transport & logistics | 2025 |
| A2B Stairlifts Limited | Wholesale & retail | 2011 |
| A4BD Ltd | Administrative & support | 2015 |
| AA & MA White Limited | Financial services | 2023 |
| AA Logistical Limited | Transport & logistics | 2019 |
| Aa-Team Global Mobility Assistance LLP | | 2012 |
| Aabel Taxis Limited | Transport & logistics | 2022 |
| Aaee Ltd | Real estate | 2024 |
| Aaion Ltd | Financial services | 2023 |
| AAM Farms | Agriculture & fishing | 2017 |
| AAM Holdings | Professional & scientific | 2015 |
| AAM Livestock Ltd | Agriculture & fishing | 2021 |
| AAM Management Consulting | Professional & scientific | 2024 |
| AAM Properties | Real estate | 2015 |
| Aardtech Limited | Extraterritorial | 2020 |
| Aarts Adriaans Onroerend Goed Limited | Administrative & support | 1995 |
| AB Electrics (SW) Limited | Construction | 2017 |
| AB Prestige Automotive Ltd | Wholesale & retail | 2024 |
| Abacus Nursery (SW) Limited | Education | 2011 |
| Abacus Vehicle Services Limited | Wholesale & retail | 2018 |
| Abad Consultancy Services Limited | Professional & scientific | 2022 |
| Abbas Marquees Limited | Administrative & support | 2002 |
| Abbey Farm Kitchen Ltd | Hospitality | 2022 |
| Abbey Garage (South West) Limited | Wholesale & retail | 1977 |
| Abbey Hill Studios Ltd | Information & communication | 2010 |
| Abbey Ling Shooting UK Ltd | Arts & recreation | 2024 |
| Abbey Windows (Taunton) Limited | Construction | 2014 |
| Abbirko Limited | Manufacturing | 2017 |
| Abbot Building Refurbishment Limited | | 1991 |
| Abbot Scott Ltd | Financial services | 2025 |
| Abbotcare Limited | Professional & scientific | 1996 |
| Abbotsfield House (Wiveliscombe) Limited | Households | 1987 |
| Abbott Gold Trading Ltd | Manufacturing | 2026 |
| ABC Subcontractors Limited | Transport & logistics | 2013 |
| Able Angels Care Agency Limited | Health & social care | 2017 |
| Abode Developments (South West) Ltd | Construction | 2024 |
| Above & Beyond Consulting (South West) Limited | Professional & scientific | 2012 |
| Abra Medical Limited | Health & social care | 2010 |
| Absolute Education Ltd | Education | 2024 |
| Absolute Foot Care Ltd | Health & social care | 2018 |
| Absolute Horsepower Limited | Wholesale & retail | 2006 |
| Abstract Painting Contractors Limited | Construction | 2007 |
| Abtennis Ltd | Education | 2019 |
| ABZ Ecommerce Ltd | Wholesale & retail | 2025 |
| ABZ Holdings Ltd | Financial services | 2023 |
| AC Construction SW Ltd | Construction | 2022 |
| AC Digital Technology Limited | Information & communication | 2023 |
| AC Huica Limited | Financial services | 2025 |
| AC Roofing & Maintenance Limited | Construction | 2025 |
| AC Security (South West) Ltd | Administrative & support | 2019 |
| AC Veterinary Services Limited | Professional & scientific | 2022 |