| Artcomms Ltd | Information & communication | 2016 |
| Arti Finish Limited | Manufacturing | 2025 |
| Artorius Faber Ltd | Manufacturing | 2015 |
| ARV Consultancy Services Limited | Professional & scientific | 2023 |
| Asar Consulting Ltd | Professional & scientific | 2003 |
| ASB Industries Ltd | Arts & recreation | 2022 |
| Aseptech Limited | Information & communication | 2021 |
| ASH Lane Developments Ltd | Construction | 2019 |
| ASH Lane Properties Ltd | Real estate | 2025 |
| Ashcombe Developments Limited | Construction | 1973 |
| Ashcombe Properties Ltd | Real estate | 1975 |
| Asher Consortium Limited | Transport & logistics | 2023 |
| Ashmil Enterprises (Yeovil) Ltd | Construction | 2016 |
| Asia Pacific Network Limited | Information & communication | 2017 |
| Asjj 2025 Limited | Hospitality | 2025 |
| Aspel (UK) Ltd | Wholesale & retail | 2019 |
| Aspire Badger Sett Ltd | Real estate | 2025 |
| Aspire Competitions Ltd | Wholesale & retail | 2019 |
| Asrs (Yeovil) Limited | Construction | 2002 |
| Asrs Preservations Limited | Extraterritorial | 2008 |
| Aston & FOX Property Staging Ltd | Administrative & support | 2024 |
| Aston-Kane Ltd | Real estate | 2020 |
| AT the Barn Ltd | Information & communication | 2016 |
| AT the Farm Somerset Ltd | Real estate | 2025 |
| Atacama Fine Art Limited | Wholesale & retail | 2017 |
| Atelier-Kazu Corporation Limited | Other services | 2003 |
| ATF SW Holdings Ltd | Financial services | 2020 |
| Athena Licensing Limited | Wholesale & retail | 1995 |
| Atlantas Marine Limited | Professional & scientific | 2000 |
| Auriga Aerospace Ltd | Professional & scientific | 2019 |
| Auriga Space Ltd | Manufacturing | 2018 |
| Auriga Technology Group Ltd | Professional & scientific | 2025 |
| Auro Technology Limited | Information & communication | 2025 |
| Autentic Ltd | Construction | 2022 |
| Auto Capozzoli Limited | Wholesale & retail | 2007 |
| Autowest Cars Limited | Wholesale & retail | 2001 |
| Auxilium HR Solutions Ltd | Administrative & support | 2020 |
| AV Scaffolding Limited | Administrative & support | 2007 |
| AVA Skip Limited | Water & waste | 2000 |
| Avro Design and Development Limited | Construction | 2016 |
| AW Technical & Creative Enterprises Ltd | Information & communication | 2026 |
| AXE Garden Works Ltd | Administrative & support | 2023 |
| Axminster Barber Ltd | Other services | 2022 |
| Axsym Limited | Extraterritorial | 2010 |
| Ayniab Ltd | Arts & recreation | 2021 |
| Aztec Design & Publishing Services Limited | Professional & scientific | 1999 |
| B DE M Property Limited | Construction | 2018 |
| B&H Norris Limited | Hospitality | 2023 |
| B&N Complex Ltd | Other services | 2022 |
| Baby Squids Yeovil and West Dorset Ltd | Education | 2024 |
| Bacchus Wedding Bars Ltd | Hospitality | 2021 |
| BACK2MARKET Ltd | Water & waste | 2021 |
| Backet Ltd | Wholesale & retail | 2015 |
| Bakers of Bond Street Limited | Wholesale & retail | 2014 |
| Bakers Recovery Limited | Wholesale & retail | 2015 |
| Baklavaty Limited | Wholesale & retail | 2023 |
| Balkan Wine Discoveries Limited | Wholesale & retail | 2017 |
| Ball and Chain Holdings Limited | Households | 2019 |
| Ballistic Fitness Ltd | Wholesale & retail | 2014 |
| Bamfords (Yeovil) Ltd | Construction | 2008 |
| Bamfords Construction Limited | Construction | 2026 |
| Bamfords ME Limited | Construction | 2026 |
| Bandit UK Limited | Professional & scientific | 2004 |
| Bangle Food Ltd | Hospitality | 2024 |
| Bardel Court Limited | Real estate | 2016 |
| Bardel Court Management Company Limited | Households | 2026 |
| Barford Pope Ltd | Agriculture & fishing | 2014 |
| Barge Motors Limited | Wholesale & retail | 2006 |
| Barker PR Limited | Administrative & support | 2008 |
| Barley Mead (Management Company) Limited | Households | 2019 |
| Barn Court (Management) Limited | Households | 2001 |
| Barnes Orchard Properties Limited | Real estate | 2000 |
| Barrington Brown Estates Limited | Construction | 2002 |
| Barrow Court (Holdings) Limited | Administrative & support | 1996 |
| Barrows Hill Properties Ltd | Financial services | 2018 |
| Barwick Holdings Ltd | Real estate | 2017 |
| Battens Secretarial Services Limited | Professional & scientific | 1997 |
| Battens Solicitors Limited | Professional & scientific | 1994 |
| BAV Motors Ltd | Wholesale & retail | 2018 |
| Bayley Electrical Ltd | Construction | 2012 |
| BB Campers Ltd | Administrative & support | 2021 |
| BC-5 Ltd | Construction | 2017 |
| Beagle Garden Products Limited | Other services | 2010 |
| Beagle Products Limited | Extraterritorial | 2011 |
| Beaminster Community Centre Partnership Limited | Arts & recreation | 2006 |
| Beaminster Dental Practice Ltd | Health & social care | 2026 |
| Beatamaxx Limited | Arts & recreation | 2007 |
| Beatnik Theatre Company Ltd | Arts & recreation | 2023 |
| Bedrock Plant Limited | Other services | 2017 |
| BEE Smart Boiler Care Limited | Construction | 2016 |
| Beeline Coaches Limited | Transport & logistics | 1971 |
| Behesht & Bareen Ltd | Real estate | 2026 |
| Bellator Consulting Limited | Professional & scientific | 2008 |
| BEN Grafton Limited | Construction | 2013 |
| Bene Trans Ltd | Transport & logistics | 2021 |
| Bengal Balti (Yeovil) Ltd | Hospitality | 2024 |
| Berkeley Leisure Group Limited(The) | Hospitality | 1960 |
| Berkeley Leisure Holidays Limited | Real estate | 2013 |
| Bertham Ltd | Real estate | 2026 |
| Better for Tomorrow Limited | Professional & scientific | 2012 |