| Bamboo Nail Studio Ltd | Other services | 2026 |
| Bamforth Evans Finance Ltd | Financial services | 2026 |
| Bamn Global Entertainment Ltd | Information & communication | 2025 |
| Bamts Limited | Wholesale & retail | 2001 |
| Ban&Nab Ltd | Financial services | 2020 |
| Banana Properties Ltd | Real estate | 2020 |
| Banaras Estates Limited | Real estate | 2023 |
| Banarasi Vanarasi Limited | Hospitality | 2019 |
| Bancroft Hinchey Limited | Wholesale & retail | 1990 |
| Bani Limited | Information & communication | 2018 |
| Bankenergi Ltd | Energy | 2018 |
| Bano M Ltd | Real estate | 2023 |
| BANTSCUISINE2.0 Ltd | Hospitality | 2025 |
| Bantu Logistics Ltd | Transport & logistics | 2024 |
| Baobab Investment Group Ltd | Real estate | 2023 |
| Bar Management Services Limited | Professional & scientific | 2025 |
| Bar Tokyo Ltd | Hospitality | 2026 |
| Bar-Dow Trans Ltd | Transport & logistics | 2015 |
| Bara Bara Limited | Hospitality | 2025 |
| Barakah DFA Limited | Real estate | 2022 |
| Barakha Ltd | Real estate | 2016 |
| Barana Limited | Real estate | 2025 |
| Baranwal Properties Limited | Real estate | 2025 |
| Baras Solutions Ltd | Information & communication | 2012 |
| Barber Cuts Ltd | Other services | 2024 |
| Barbergrowth Ltd | Professional & scientific | 2026 |
| Barbershop Reading Ltd | Other services | 2019 |
| Bardwell Trade Limited | Professional & scientific | 2026 |
| Bare Beauty Co Reading Limited | Other services | 2026 |
| Bariah Ltd | Wholesale & retail | 2025 |
| Bark and Stroll Reading Limited | Other services | 2026 |
| Barkham Office Furniture Limited | Wholesale & retail | 2000 |
| Barking Club Limited | Wholesale & retail | 2023 |
| Barking MAD Pet Services Ltd | Wholesale & retail | 2021 |
| Barks, Bubbles and Bows Limited | Administrative & support | 2016 |
| Barley Meadows (Badshot LEA) Management Company Limited | Households | 2022 |
| Barlow Finch Communications (BFC) Ltd. | Professional & scientific | 2023 |
| Barmark Developments Limited | Real estate | 1995 |
| Barn Management Limited | Households | 1989 |
| Barnes Property Group Limited | Real estate | 2022 |
| Barnes Wholesalers Limited | Administrative & support | 2025 |
| Barney Quinn Consultancy Limited | Professional & scientific | 2021 |
| Barnwell Developments Limited | Construction | 2012 |
| Baroness Studios Ltd | Information & communication | 2023 |
| Baroni Testing Services Ltd | Information & communication | 2025 |
| Barot Consulting Limited | Information & communication | 2011 |
| Barra Watches Ltd | Manufacturing | 2021 |
| Barracuda Networks Limited | Information & communication | 2004 |
| Barrett Ceilings Limited | Professional & scientific | 1985 |
| Barros - Taxes Ltd | Professional & scientific | 2023 |
| Barry Controls Limited | Manufacturing | 1950 |
| Barry Hayden Photography Ltd | Professional & scientific | 2012 |
| Barry Wright (U.K.) Limited | Manufacturing | 1986 |
| Barry-Walsh Associates Ltd | Professional & scientific | 2017 |
| Barstone Limited | Professional & scientific | 2006 |
| Barter Property Associates Limited | Real estate | 2023 |
| Bartlett Holdings Limited | Professional & scientific | 2006 |
| Bartlett Mitchell Limited | Hospitality | 1999 |
| Bartlett Mitchell Services Limited | Professional & scientific | 2014 |
| Bartlett Property Development Ltd | Real estate | 2018 |
| Bartlett Solutions Ltd | Manufacturing | 2015 |
| Barvik Ltd | Manufacturing | 2018 |
| Baryaab Ltd | Wholesale & retail | 2023 |
| Barzey Power Engineering Ltd | Construction | 2023 |
| BAS Hom*S Ltd | Hospitality | 2025 |
| BAS Plumbing & Heating Limited | Construction | 2007 |
| Bash GTS Ltd | Transport & logistics | 2025 |
| Bashan Temple International Ministry Ltd | Professional & scientific | 2025 |
| Bashir International Limited | Wholesale & retail | 2024 |
| Bashir Trading Limited | Wholesale & retail | 2024 |
| Bashly Ltd | Wholesale & retail | 2026 |
| Basicnote Property Management Company Limited | Households | 1992 |
| Basicx Ltd | Manufacturing | 2023 |
| Basil Accounts Holdings Ltd | Financial services | 2026 |
| Basil Accounts Ltd | Professional & scientific | 2012 |
| Basil HUT Ltd | Hospitality | 2022 |
| Basilisk Labs Limited | Information & communication | 2024 |
| Basingstoke Golf Club Limited (the) | Arts & recreation | 1968 |
| Basingstoke Store Limited | Wholesale & retail | 2023 |
| Basiox Controls Limited | Wholesale & retail | 2023 |
| Basmol Ltd | Professional & scientific | 2023 |
| Basportstar Limited | Arts & recreation | 2016 |
| Bassna Investments Group Limited | Hospitality | 2022 |
| Bat's Autos Ltd | Wholesale & retail | 2024 |
| Bat's Enterprise Ltd | Wholesale & retail | 2024 |
| Bates FMC Limited | Administrative & support | 2014 |
| Bath & Lebone Group Limited | Wholesale & retail | 2022 |
| Bath Eco Renovations Ltd | Construction | 2017 |
| Bath OMZ Limited | Wholesale & retail | 2024 |
| Battengrowth Ltd | Professional & scientific | 2026 |
| Batteri Ltd | Hospitality | 2026 |
| Battery Consulting Partners Ltd | Professional & scientific | 2022 |
| Battyshiel Limited | Other services | 2012 |
| Bauen Limited | Real estate | 2011 |
| Baumann Building Ltd | Manufacturing | 2018 |
| Baupost Group International LLP | | 2011 |
| Baupost Group Limited | Financial services | 2011 |
| Bauwatch (UK) Limited | Wholesale & retail | 2011 |
| Baxter Smith Limited | Professional & scientific | 2000 |
| Baxter Subsea & Marine Limited | Manufacturing | 2026 |