| 10-12 Property Ltd | Real estate | 2021 |
| 16 Delorme Street Limited | Real estate | 2001 |
| 1ST Choice 4 Decorating Limited | Construction | 2002 |
| 1ST Women UK Limited | Arts & recreation | 2009 |
| 21 Somerset Consulting Ltd | Professional & scientific | 2026 |
| 21 Somerset Ltd | Information & communication | 2022 |
| 2ZERO2 Racing Ltd | Manufacturing | 2026 |
| 35 High Street Management Company (Wellington) Ltd | Households | 2002 |
| 3D Fire Defence Systems Ltd | Construction | 2012 |
| 3M Bakery Limited | Manufacturing | 2016 |
| 3SPHERES UK Ltd | Professional & scientific | 2009 |
| 4 Site Security Solutions Ltd | Administrative & support | 2024 |
| 4&20 Ltd | Hospitality | 2017 |
| 45 Cricket Supplies Ltd | Wholesale & retail | 2021 |
| 5 Kind Trading Ltd | Wholesale & retail | 2019 |
| 50 Parson Street Management Company Limited | Real estate | 2014 |
| A B Education Limited | Education | 2003 |
| A D Coombes Ltd | Professional & scientific | 2023 |
| A Oaten (Groundworks) Limited | Construction | 2015 |
| A Oaten (Plant Hire) Limited | Administrative & support | 2003 |
| A Plus Accountancy & Business Solutions Limited | Professional & scientific | 2010 |
| A Repairs Ltd | Construction | 2019 |
| A&S Mobile Foods Ltd | Hospitality | 2024 |
| A.C.&S. Storrier Properties Limited | Real estate | 2017 |
| A.M. Robb Limited | Manufacturing | 1987 |
| A.S. Maitland (Farms) Limited | Agriculture & fishing | 1975 |
| Aardworks 3D Solutions Ltd | Information & communication | 2015 |
| Abacus Construction Limited | Construction | 2003 |
| Abacus Holdings (SW) Limited | Financial services | 2025 |
| Abacus Properties (SW) Limited | Real estate | 2025 |
| Absolute Store Limited | Transport & logistics | 2021 |
| Access Insight UK Ltd | Information & communication | 2025 |
| Ace Properties (South West) Limited | Construction | 2018 |
| Acet Management Limited | Real estate | 2018 |
| Acet Solutions Limited | Real estate | 2018 |
| ACK Developments Ltd | Real estate | 2025 |
| Acorn Finance and Management Services Limited | Real estate | 2001 |
| Acorn Safe Storage Limited | Transport & logistics | 2021 |
| Acres & Assets Ltd | Real estate | 2024 |
| Activity Warehouse Limited | Real estate | 2023 |
| Acurisk Limited | Financial services | 2024 |
| AD Modum Club Ltd | Wholesale & retail | 2021 |
| AD24 Ltd | Health & social care | 2018 |
| Adam Gardner Photography Ltd | Professional & scientific | 2024 |
| Adam Howe Haulage Limited | Transport & logistics | 2025 |
| Adaptive Psychotherapy and Supervision With EVE Ltd | Health & social care | 2024 |
| Aden Cuciniello Limited | Professional & scientific | 2018 |
| Adept Solutions Limited | Information & communication | 2009 |
| Aderinoye Limited | Wholesale & retail | 2023 |
| ADM Furniture Limited | Manufacturing | 2001 |
| Agri GV Solutions Ltd | Agriculture & fishing | 2025 |
| Agri Plant & Commercial Services Ltd | Wholesale & retail | 2024 |
| Aidos Advisory Ltd | Professional & scientific | 2022 |
| Airarmsspares.Com Ltd | Wholesale & retail | 2003 |
| Airport Travel South West Limited | Transport & logistics | 2024 |
| AIT Developments Ltd | Real estate | 2024 |
| AJ Domestic Appliances Limited | Manufacturing | 2002 |
| AJD Heating Services Ltd | Construction | 2021 |
| Alacer Risk Limited | Administrative & support | 2014 |
| Alan Mcdonald Ltd | Construction | 2014 |
| Alan Oaten Trading Ltd | Financial services | 2023 |
| Alan Oaten Vehicle Servicing Limited | Wholesale & retail | 2018 |
| Alexandra Dunn Racing Ltd | Arts & recreation | 2012 |
| Aliard Consultancy Limited | Professional & scientific | 2018 |
| ALL Paws South West Ltd | Other services | 2022 |
| Almondus Properties Limited | Professional & scientific | 2006 |
| Alternative Markets Ltd | Administrative & support | 2023 |
| AM Robb Investments Ltd | Financial services | 2021 |
| AMG Creative Limited | Professional & scientific | 2003 |
| Ampm Training Ltd | Information & communication | 2020 |
| AMT Linkt Ltd | Professional & scientific | 2023 |
| Andy Stowell Financial Planning Limited | Administrative & support | 2020 |
| ANN Holman Company Ltd | Professional & scientific | 2003 |
| Anne Priscott Associates Ltd | Professional & scientific | 2005 |
| ANP Interim Limited | Professional & scientific | 2005 |
| Anthony COX Designers Ltd | Professional & scientific | 2018 |
| APC Restoration Limited | Administrative & support | 2017 |
| Apex Medical and Rescue Ltd | Health & social care | 2023 |
| Apple Campers (South West) Ltd | Wholesale & retail | 2015 |
| Appletree Nurseries Ltd | Education | 2013 |
| Aqueduct Estate Limited | Construction | 2016 |
| ARB Fencing Ltd | Construction | 2020 |
| Archgold Investments Ltd | Financial services | 2005 |
| Ardery Enterprises Limited | Hospitality | 2022 |
| ARK Rubber and Resin Solutions Limited | Wholesale & retail | 2011 |
| Arquip Ltd | Manufacturing | 2025 |
| Arwen Properties Limited | Professional & scientific | 2005 |
| Ashley Window Cleaning Ltd | Administrative & support | 2018 |
| Ashmira Botanica Ltd | Wholesale & retail | 2016 |
| Ashton Morton Ltd | Construction | 2025 |
| Asimi Holdings Limited | Wholesale & retail | 2020 |
| ASPECT3SIXTY Ltd | Construction | 2015 |
| Aspin Property Management Limited | Real estate | 2023 |
| Aspire Fitness and Wellbeing Ltd | Arts & recreation | 2020 |
| Asset Protech Ltd | Administrative & support | 2024 |
| Association of Core Process Psychotherapists | Other services | 2017 |
| Astra Corporation Limited | Wholesale & retail | 2018 |
| ATA Access Ltd | Construction | 2018 |
| Atlantic Food Solutions Ltd | Professional & scientific | 2022 |
| Atlas CDM Group Ltd | Professional & scientific | 2018 |