| Basingstoke & Midhants Athletic Club | Arts & recreation | 2022 |
| Basingstoke GAS & Heating Services Ltd | Manufacturing | 2002 |
| BBC Property Management Ltd | Wholesale & retail | 2018 |
| BBD Rock Limited | Financial services | 2020 |
| BC Refrigeration and Air Conditioning Limited | Manufacturing | 2016 |
| BCA Automotive Ltd | Financial services | 1989 |
| BCA Central Limited | Financial services | 2009 |
| BCA Europe Limited | Financial services | 2000 |
| BCA Fleet Solutions Limited | Wholesale & retail | 2005 |
| BCA Group Europe Limited | Financial services | 1995 |
| BCA Holdings Limited | Financial services | 1995 |
| BCA Limited | Extraterritorial | 1995 |
| BCA Logistics Limited | Transport & logistics | 1990 |
| BCA Marketplace Limited | Financial services | 2014 |
| BCA Osprey Finance Limited | Professional & scientific | 2014 |
| BCA Osprey I Limited | Financial services | 2009 |
| BCA Osprey II Limited | Financial services | 2009 |
| BCA Outsource Solutions Limited | Wholesale & retail | 1980 |
| BCA Pension Trustees Limited | Extraterritorial | 1996 |
| BCA Remarketing Group Limited | Financial services | 2009 |
| BCA Remarketing Solutions Limited | Wholesale & retail | 2002 |
| BCA Trading Limited | Financial services | 1989 |
| BCA Vehicle Finance Limited | Financial services | 2013 |
| BCA Vehicle Services Limited | Wholesale & retail | 2000 |
| BD Landscapes Ltd | Construction | 2022 |
| BDP Solutions Holdings Limited | Financial services | 2023 |
| BDP Solutions Limited | Manufacturing | 2011 |
| BE YOU Chiropractic Limited | Health & social care | 2024 |
| Beachwalkers Ltd | Arts & recreation | 2025 |
| Beagrie Consulting Limited | Professional & scientific | 2005 |
| Beans Professional Services (A&C) Ltd | Professional & scientific | 2019 |
| Beany Sanders Ltd | Construction | 2025 |
| Bear House Build and Roofing Ltd | Construction | 2020 |
| Bear Security Consultants Ltd | Administrative & support | 2025 |
| Beauclerk Green Residents Association Limited | Households | 1996 |
| Beaupre Consulting Ltd | Professional & scientific | 2024 |
| Beautiful Floors Limited | Wholesale & retail | 2023 |
| Beaux Books Limited | Wholesale & retail | 2016 |
| Beechwood Carpentry & Construction Ltd | Construction | 2024 |
| Beetroot and Birmingham Limited | Hospitality | 2014 |
| Bell Cornwell LLP | | 2008 |
| Bellengers Limited | Real estate | 2001 |
| Bellerose Homes Ltd | Real estate | 2020 |
| Bellus Beauty & Aesthetics Ltd | Other services | 2026 |
| Bengali Hindu Adarsh Sangh UK Limited | Education | 2021 |
| Berks and Bucks Draghounds Club Ltd | Arts & recreation | 2022 |
| Berkshire Network Supplies Limited | Other services | 2005 |
| Bespoke Education Agency Ltd | Administrative & support | 2024 |
| Bespoke Pet Services Ltd | Manufacturing | 2025 |
| Best Quality Care Ltd | Public administration | 2018 |
| Beti Healthcare. Ltd | Health & social care | 2019 |
| Better Business Matters Ltd | Professional & scientific | 2023 |
| Betterco Consulting Ltd | Professional & scientific | 2024 |
| Bewell Capital Limited | Financial services | 2022 |
| BFD Installation Ltd | Construction | 2025 |
| Bhadana PVT Ltd | Hospitality | 2025 |
| BHP Prime Services Group Limited | Professional & scientific | 2018 |
| Bianchi & Shore Motor Vehicles Ltd | Wholesale & retail | 2015 |
| Bifold Megastore Limited | Administrative & support | 2025 |
| Billump Ltd | Professional & scientific | 2019 |
| Binning & Binning Limited | Financial services | 2018 |
| Birdsong Creative Limited | Professional & scientific | 2014 |
| BJF Properties LLP | | 2012 |
| Bjfp Limited | Real estate | 2012 |
| BK Partners Ltd | Professional & scientific | 2004 |
| BL Drinks Ltd | Manufacturing | 2018 |
| Blacknight Construction Limited | Construction | 2014 |
| Blainroe Ventures Ltd | Professional & scientific | 2024 |
| Blanchard Technical Limited | Professional & scientific | 2015 |
| Block 4 Mindenhurst (I&J) Management Company Limited | Households | 2025 |
| Block a Heatherwood (Ascot) Resident Management Company Limited | Households | 2024 |
| Block B Heatherwood (Ascot) Resident Management Company Limited | Households | 2024 |
| Block C Heatherwood (Ascot) Resident Management Company Limited | Households | 2024 |
| Block D Heatherwood (Ascot) Resident Management Company Limited | Households | 2024 |
| Block E Heatherwood (Ascot) Resident Management Company Limited | Households | 2024 |
| Block F Heatherwood (Ascot) Resident Management Company Limited | Households | 2024 |
| Block G Heatherwood (Ascot) Resident Management Company Limited | Households | 2024 |
| Block H Heatherwood (Ascot) Resident Management Company Limited | Households | 2024 |
| Blokland Ltd | Arts & recreation | 2020 |
| Bloomind Studios Ltd | Professional & scientific | 2025 |
| Blue Bear Bookshop Ltd | Wholesale & retail | 2019 |
| Blue Resources Ltd | Professional & scientific | 2017 |
| Bluebell & Bear Ltd | Wholesale & retail | 2018 |
| Bluebell Admin Services Limited | Professional & scientific | 2020 |
| Bluefern Management Systems Limited | Professional & scientific | 2013 |
| Blueprint OPS Limited | Administrative & support | 2025 |
| BML Accountants Limited | Professional & scientific | 2014 |
| Bobbun Books Ltd | Information & communication | 2017 |
| Boho House Ltd | Real estate | 2021 |
| Bonnie Bairns Play Co. Ltd | Health & social care | 2023 |
| Boscobel & Partners Limited | Administrative & support | 2015 |
| Bosse Systems Ltd | Financial services | 2025 |
| Bourne & Haystaff Limited | Other services | 2004 |
| Bourne for Travel Ltd | Administrative & support | 2026 |
| Boxcold UK Limited | Other services | 2022 |
| Boxxsmart Ltd | Information & communication | 2026 |
| Bramshill Business Services Limited | Administrative & support | 2015 |
| Bramshill Development Limited | Construction | 2024 |
| Bramshill House Limited | Hospitality | 2022 |
| Bramshill Ltd | Administrative & support | 2014 |