| Ayres Investments Ltd | Real estate | 2021 |
| Aythorpe Roding Residents Management Company Limited | Households | 2015 |
| Ayzak Holdings Limited | Financial services | 2022 |
| Azimuth Partners Ltd | Information & communication | 2025 |
| Azure (Portishead) Management Company Limited | Households | 2008 |
| Azure 2 Management Company Limited | Households | 2009 |
| B & C Enterprises (Wiltshire) Limited | Professional & scientific | 2009 |
| B & J Harris Properties Ltd | Real estate | 2021 |
| B & M Windows & Doors Ltd. | Manufacturing | 1999 |
| B and R Services Limited | Health & social care | 2016 |
| B Ashton Developments Ltd | Construction | 2023 |
| B F Keane Electrical Contractors Limited | Construction | 1998 |
| B J Marshall Construction Limited | Construction | 2002 |
| B K Isaacs Sons Ltd | Construction | 2013 |
| B Maddy Consultancy Limited | Professional & scientific | 2021 |
| B&B Creative Development Limited | Real estate | 2025 |
| B&B Creative Limited | Professional & scientific | 2017 |
| B&E Services Limited | Construction | 2004 |
| B&F Construction Ltd | Construction | 2022 |
| B&H Call Limited | Health & social care | 2023 |
| B&M Building and Construction Services Limited | Construction | 2015 |
| B&S Recovery Specialists Limited | Wholesale & retail | 2019 |
| B-Cuts Amesbury Limited | Other services | 2024 |
| B-Cuts Limited | Other services | 2021 |
| B-Cuts Products Ltd | Other services | 2025 |
| B-Unique Beauty and Aesthetics Limited | Other services | 2020 |
| B.T.Mason Services Ltd | Administrative & support | 2026 |
| B360 Limited | Information & communication | 2016 |
| Babigloo Music for Babies Community Interest Company | Arts & recreation | 2017 |
| Baby Sensory International Limited | Administrative & support | 2007 |
| Baby Sensory Limited | Administrative & support | 2005 |
| Baby Sensory Supplies Limited | Wholesale & retail | 2007 |
| Babylon Shawarma Ltd | Hospitality | 2023 |
| Bache Ltd | Information & communication | 2011 |
| Back on Track Chiropractic Ltd | Health & social care | 2021 |
| Back to Black Enterprises Ltd | Real estate | 2022 |
| Back to the Roots Limited | Administrative & support | 2022 |
| Backhouse Blunsdon Management Company Limited | Households | 2022 |
| Backhouse Highworth Management Company Limited | Households | 2022 |
| Backhouse Highworth Phase 2 Management Company Limited | Households | 2024 |
| Backhouse Midsomer Norton Facilities Management Limited | Households | 2022 |
| Backhouse Moreton in Marsh Management Company Limited | Households | 2023 |
| Badbury Heights NO 2 (Blandford) Management Company Limited | Households | 2010 |
| Bader House Residents Limited | Households | 2007 |
| Badger Procurement Ltd | Administrative & support | 2006 |
| Bahooshy Coms Ltd | Information & communication | 2022 |
| Baid (Holdings) Limited | Real estate | 2014 |
| Baird Property Services Limited | Construction | 2021 |
| Bake Farming Ltd | Agriculture & fishing | 1997 |
| Baker Page Associates Ltd | Professional & scientific | 2024 |
| Baker Roofing Ltd | Construction | 2025 |
| Baker Street Media Ltd | Information & communication | 2025 |
| Bakers Mews Management Company Limited | Households | 2005 |
| Baki Catering Ltd | Hospitality | 2025 |
| Bakshish Ltd | Wholesale & retail | 2023 |
| Balkan Expeditions Limited | Administrative & support | 2024 |
| Ballantyne Property Services Ltd | Real estate | 2019 |
| Bambusa Events Ltd | Hospitality | 2024 |
| Banana Creative Limited | Wholesale & retail | 2024 |
| Bandit Catering Ltd | Hospitality | 2025 |
| Banks Specialist Covers Limited | Manufacturing | 1999 |
| Bantu Storykeepers Limited | Information & communication | 2025 |
| Bapco (Trading) Limited | Professional & scientific | 2018 |
| Bapco Limited | Administrative & support | 2001 |
| Baraboux Ltd | Wholesale & retail | 2021 |
| Barakat Properties Birmingham Limited | Real estate | 2026 |
| Barb Properties Ltd | Real estate | 2016 |
| Barbados Property Limited | Administrative & support | 2007 |
| Barbarian Studios Limited | Arts & recreation | 2025 |
| Barbe Ltd | Administrative & support | 2023 |
| Barber&Alderton Ltd | Energy | 2022 |
| Barcham Limited | Real estate | 2014 |
| Barchester Lettings Ltd | Real estate | 2004 |
| Barclay + Phillips Limited | Professional & scientific | 1980 |
| Barden Land and Property Limited | Real estate | 2023 |
| Bardic Consulting Ltd | Information & communication | 2025 |
| Barebone Consulting Ltd | Professional & scientific | 2025 |
| Barefoot Barns Ltd | Agriculture & fishing | 2020 |
| Barford Down Homes Ltd. | Real estate | 2015 |
| Barford Park Limited | Agriculture & fishing | 2014 |
| BARFORD25BKW Ltd | Hospitality | 2025 |
| Bargin Vault Ltd | Wholesale & retail | 2025 |
| Bark Consulting Ltd | Financial services | 2011 |
| Barker Consultants Limited | Construction | 2022 |
| Barley Fields (Alton) Management Company Limited | Households | 2012 |
| Barley Fields (Tamworth) Management Company Limited | Households | 2017 |
| Barleycorn Consulting Ltd | Wholesale & retail | 2022 |
| Barnaby Quinn Ltd | Construction | 2024 |
| Barnack Business Centre Limited | Real estate | 1988 |
| Barnsell Technology Consultants Limited | Professional & scientific | 2021 |
| Barratt & Arber Limited | Other services | 2017 |
| Barry Cridland Compliance & Financial Management Limited | Professional & scientific | 2021 |
| Barry Mason Enterprises Limited | Information & communication | 1960 |
| Barry Mason Music Limited | Professional & scientific | 1969 |
| Barry Waterfront Residents Management Company Limited | Households | 2014 |
| Bartlett Contractors Limited | Construction | 1999 |
| Bartlett View Management Limited | Households | 2011 |
| Bartlow Management Limited | Households | 2023 |
| Barton Brake (Wembury) Residents Management Company Limited | Households | 2015 |
| Barton-Skeates Limited | Professional & scientific | 2019 |