| 1 Greenfields Limited | Real estate | 2023 |
| 12 Atherfold Road Management Company Limited | Real estate | 1999 |
| 2 Medley Road Limited | Households | 2012 |
| 20TH Century Design Ltd | Wholesale & retail | 2019 |
| 28 ST James’S ST Ltd | Construction | 2008 |
| 31 Regent Street Management Limited | Real estate | 1995 |
| 37 39 41 & 43 Northfields RTM Company Limited | Households | 2011 |
| 38 Hound Street Management Limited | Households | 2008 |
| 45 Beauchamp Road Limited | Real estate | 2000 |
| 49LRN Management Limited | Extraterritorial | 2021 |
| 4TH Generation Services Ltd | Information & communication | 2018 |
| 4TV Accounting Ltd | Professional & scientific | 2022 |
| 6BH Consultancy Ltd | Professional & scientific | 2017 |
| 7 Miles a Minute Ltd | Professional & scientific | 2016 |
| 71 Nile Street Limited | Real estate | 2018 |
| 91 North Street Limited | Households | 2020 |
| A Besley Consulting Ltd | Professional & scientific | 2024 |
| A D Aesthetics Pharmacist Ltd | Health & social care | 2023 |
| A Webb Consulting Ltd | Professional & scientific | 2024 |
| A. E. Mantell Psychiatry Limited | Health & social care | 2026 |
| A.F. Myers Plumbing Ltd | Construction | 2012 |
| A.R.V. Agricultural Engineering Limited | Manufacturing | 2003 |
| AA Partners Ltd | Wholesale & retail | 2025 |
| Aadmi Private Ltd | Wholesale & retail | 2023 |
| AB Conduit Building Ltd | Construction | 2022 |
| Abbey Contractors (SW) Ltd | Construction | 2020 |
| Abbey Electrical Yeovil Limited | Manufacturing | 2011 |
| Abbotts Court Sherborne Management Company Limited | Real estate | 2012 |
| Ablebox Limited | Manufacturing | 1990 |
| Absolute Electrics SW Ltd | Construction | 2025 |
| AC Plumbing of Sherborne Limited | Construction | 2014 |
| Accounts for Business Limited | Professional & scientific | 2003 |
| Ace Fibreglass (Sherborne) Limited | Manufacturing | 2011 |
| ACIPINAR68 Ltd | Hospitality | 2026 |
| Acom Holdings Ltd | Financial services | 2026 |
| Adlaine Inspection Ltd | Professional & scientific | 2019 |
| Adriawildlife Tours Limited | Professional & scientific | 2019 |
| AE Hills Ltd | Professional & scientific | 2025 |
| Aerial Photography UK Ltd | Professional & scientific | 2012 |
| Aerospace Electric Limited | Professional & scientific | 2016 |
| Aerosynergy Limited | Professional & scientific | 2005 |
| Aerowork Limited | Professional & scientific | 2021 |
| Afix Group UK Limited | Construction | 2013 |
| Afix Scaffolding UK Ltd | Administrative & support | 2019 |
| Agincourt Holdings Ltd | Financial services | 2022 |
| Airframe Systems Limited | Professional & scientific | 2011 |
| AJS Plumbing & Heating Solutions Limited | Construction | 2017 |
| Albion Heritage Limited | Professional & scientific | 2001 |
| Albooto Limited | Professional & scientific | 2014 |
| Aldvent Ltd | Financial services | 2022 |
| Allicom Global Ltd | Professional & scientific | 2014 |
| Alors Limited | Information & communication | 2021 |
| Alpha International Associates Limited | Manufacturing | 1987 |
| Always Recruiting Limited | Administrative & support | 2016 |
| AM Family Law Services Ltd | Professional & scientific | 2021 |
| AM Property Lettings Ltd | Real estate | 2016 |
| Amanda Allen Property Consulting Ltd | Professional & scientific | 2021 |
| AMB Industries Limited | Manufacturing | 2023 |
| Ambrose Business Services Ltd | Professional & scientific | 2018 |
| Ameppy Limited | Real estate | 2025 |
| Amolsa Holdings Limited | Financial services | 2025 |
| Amuse LA Bouche Limited | Wholesale & retail | 2023 |
| Ancient Mesopotamia Gifts Ltd | Wholesale & retail | 2016 |
| Andrew Scott Land & Property Ltd | Real estate | 2020 |
| Andrews Building Services Limited | Construction | 2018 |
| Andrews Lettings Ltd | Real estate | 2021 |
| Andromeda Wealth Limited | Financial services | 2014 |
| Angelo Ferrari Builders Ltd | Construction | 2017 |
| Anglo Swiss Finance Limited | Professional & scientific | 2003 |
| ANN Scott Consulting Ltd | Professional & scientific | 2018 |
| Annette Cremin LLP | | 2020 |
| Ansford Inn Management Company Limited | Households | 1987 |
| Antelope Place (Management) Company Limited | Real estate | 2009 |
| Antonetti Group Limited | Administrative & support | 2026 |
| Antonia Jolles Ltd | Professional & scientific | 2022 |
| Antony Graziano Property Maintenance Ltd | Construction | 2024 |
| Aorp Investments Ltd | Financial services | 2019 |
| Apex Brewery Limited | Manufacturing | 2022 |
| Appeal Films Limited | Information & communication | 2014 |
| Appeal TV Limited | Information & communication | 2017 |
| Apple Orchard Homes Ltd | Construction | 2020 |
| Appleby Game Limited | Agriculture & fishing | 2009 |
| APT King Holdings Limited | Financial services | 2025 |
| Arborex Ltd | Agriculture & fishing | 2019 |
| Archet Finance Limited | Professional & scientific | 2019 |
| Architects in Practice Ltd | Professional & scientific | 2020 |
| Architela Ltd | Education | 2010 |
| Aristos Consulting Ltd | Education | 2009 |
| Art in Sport Limited | Information & communication | 1996 |
| Art of Confidence Ltd | Administrative & support | 2022 |
| Artefact Studio Ltd | Professional & scientific | 2020 |
| Artichoke Sherborne Ltd | Wholesale & retail | 2023 |
| Arttus and Alice Ltd | Professional & scientific | 2012 |
| Ascent Education Limited | Administrative & support | 2018 |
| Ashley Slater Limited | Information & communication | 2012 |
| Asif Khan Limited | Arts & recreation | 2008 |
| Assetsphere Limited | Professional & scientific | 2017 |
| AST Trades Ltd | Administrative & support | 2026 |
| Atelier Cabinet Makers Limited | Manufacturing | 2015 |
| Atelier Janaye Ltd | Professional & scientific | 2021 |