| BAS Group Holdings Limited | Financial services | 2025 |
| BAS Property Consultants Limited | Construction | 2006 |
| Basad Consultancy Ltd | Administrative & support | 2014 |
| Baseline Nutrition Ltd | Hospitality | 2026 |
| Bash Property Ltd | Households | 2021 |
| Bashir Ahmed Teaching Ltd | Education | 2014 |
| Basil's Bar Ltd | Hospitality | 2026 |
| Basilisk Joinery Ltd | Manufacturing | 2019 |
| Basing Hand and Shoulder Clinic Limited | Health & social care | 2017 |
| Baskerville Worldwide Ventures Ltd | Other services | 2006 |
| Bass and Plumbley Roofing and Cladding Specialist Limited | Construction | 2026 |
| Basset IT Solutions Ltd | Wholesale & retail | 2024 |
| Bassett & Partners Ltd | Wholesale & retail | 2024 |
| Bassett Autos Ltd | Wholesale & retail | 2018 |
| Bassett Carpentry and Construction Ltd | Construction | 2017 |
| Bassett Dental Practice Limited | Health & social care | 2007 |
| Bassett Estates Limited | Real estate | 2018 |
| Bassett Glade Limited | Real estate | 2014 |
| Bassett Green Chippy Limited | Hospitality | 2021 |
| Bassett Green Limited | Professional & scientific | 2018 |
| Bassett Lock & Key Ltd. | Administrative & support | 2009 |
| Bassett Market Wholesale Ltd | Wholesale & retail | 2009 |
| Bassett Mews Property Management Limited | Households | 2019 |
| Bassett Pharmacy Limited | Wholesale & retail | 2003 |
| Bassett Property Maintenance Limited | Administrative & support | 2023 |
| Bassett Real Estate Limited | Real estate | 2018 |
| Bassett Systems Ltd | Wholesale & retail | 2020 |
| Bassett Wood Gardens Management Limited | Households | 2005 |
| Bassett Wood West Ltd | Extraterritorial | 2013 |
| Bastins Estate Management Company Limited | Households | 2006 |
| Bastion IT Solutions Ltd | Wholesale & retail | 2023 |
| Bastos Automotive Limited | Wholesale & retail | 2025 |
| BAT Cave Games Limited | Information & communication | 2016 |
| Batala Portsmouth Ltd | Arts & recreation | 2023 |
| Bateman Collins Group Limited | Financial services | 2021 |
| Bateman Collins International Limited | Administrative & support | 2012 |
| Bath Court Management Limited | Hospitality | 1998 |
| Bathroom Cabins Limited | Wholesale & retail | 2020 |
| Bathurst Offshore Racing Ltd | Education | 2025 |
| Batten Electrical Services Limited | Construction | 2007 |
| Battensbootcamp Limited | Arts & recreation | 2025 |
| Battle of Britain Dodgems Limited | Arts & recreation | 2024 |
| Battleplan Groundworks Ltd | Construction | 2022 |
| Battlesoap Ltd | Manufacturing | 2023 |
| Bawar Superstore Ltd | Wholesale & retail | 2017 |
| Baxter Hall Recruitment Limited | Administrative & support | 2012 |
| Bay Dreams Property Management Ltd | Real estate | 2026 |
| Baydon Capital Limited | Financial services | 2024 |
| Bayshore Drive Holdings Limited | Financial services | 2025 |
| Bayside Media Limited | Information & communication | 2026 |
| Bayview Healthcare Ltd | Administrative & support | 2015 |
| Baywatch Limited | Extraterritorial | 1996 |
| Baywood Accounting Ltd | Professional & scientific | 2025 |
| BAZ Builders Limited | Construction | 2022 |
| BAZ Developers Ltd | Wholesale & retail | 2023 |
| Bazolu Investments Limited | Real estate | 2023 |
| BB Automotive & Sales Ltd | Wholesale & retail | 2023 |
| BB Brasserie Limited | Hospitality | 2018 |
| BB Commodity Limited | Wholesale & retail | 2014 |
| BB Marine & Coverguard Limited | Manufacturing | 1989 |
| BB Roofing Limited | Construction | 2021 |
| BBC Coffee Limited | Manufacturing | 2020 |
| BBD Consulting Limited | Professional & scientific | 2024 |
| BBD Enterprises Ltd | Wholesale & retail | 2023 |
| BBK Accounts Ltd | Professional & scientific | 2011 |
| BBQ Boss Fareham Ltd. | Hospitality | 2019 |
| Bbqg Ltd | Wholesale & retail | 2024 |
| Bbrand Ltd | Wholesale & retail | 2025 |
| Bbsig Ltd | Construction | 2019 |
| Bbsm Connect Ltd | Wholesale & retail | 2023 |
| BC Investments Limited Partnership | | 2008 |
| BC Marine Ltd | Manufacturing | 2023 |
| BC Venture Limited | Wholesale & retail | 2020 |
| BCA Groundworks Ltd | Agriculture & fishing | 2024 |
| BCC Recruitment Ltd | Administrative & support | 2024 |
| BCD Industrial Ltd. | Transport & logistics | 2017 |
| BCD Trading Limited | Wholesale & retail | 2023 |
| BCJ Castle Chambers Ltd | Real estate | 2021 |
| BCJ Couriers Limited | Transport & logistics | 2014 |
| BCJ Operations Ltd | Real estate | 2021 |
| BCJ Property (Salisbury) Ltd. | Real estate | 2021 |
| BCJ Property Ltd | Real estate | 2021 |
| BCL MOT Centre Limited | Wholesale & retail | 2011 |
| BCL2020 Ltd | Professional & scientific | 2020 |
| Bcpex Ltd | Construction | 2024 |
| BCR Homes Limited | Manufacturing | 1986 |
| Bcsa Training Portal Ltd | Other services | 2025 |
| BCT Transport Ltd | Manufacturing | 2025 |
| Bcyber Ltd | Wholesale & retail | 2014 |
| BD Brickworkk Ltd | Construction | 2026 |
| BD Marine Limited | Manufacturing | 1974 |
| Bd-Nl Investment Ltd | Other services | 2022 |
| BDA Holiday Homes Ltd | Real estate | 2024 |
| BDC Servicing Limited | Financial services | 2014 |
| BDH Southampton Limited | Real estate | 2025 |
| BDJ Commercial Limited | Real estate | 2011 |
| BDJ Homes Limited | Construction | 2021 |
| BDJ Lettings Limited | Real estate | 2025 |
| BDJ Properties Limited | Real estate | 2015 |
| BDJ Winchester Limited | Real estate | 2021 |