| Baserock IT Solutions Ltd | Information & communication | 2010 |
| Bassetsbury Barn Company Limited | Professional & scientific | 2001 |
| BAT and Ball HG Ltd | Real estate | 2025 |
| BAT and Ball PUB Community Interest Company | Hospitality | 2025 |
| Batal Drylining Ltd | Construction | 2024 |
| Batch Property Investments Ltd | Real estate | 2020 |
| Bates Investment Holdings Limited | Real estate | 2021 |
| Bathroom Design Widmer END Limited | Wholesale & retail | 2009 |
| Batrachian Management Company Limited | Real estate | 2001 |
| Battersea Exchange Management Company Limited | Households | 2015 |
| Battle BUS Gaming Limited | Arts & recreation | 2025 |
| Baysoft Consultants Limited | Information & communication | 2011 |
| BAZ & a Limited | Manufacturing | 2015 |
| Bazoocar Ltd | Wholesale & retail | 2022 |
| BB Change Management Limited | Professional & scientific | 2013 |
| BB Facades Limited | Extraterritorial | 2020 |
| BB Games Ltd | Manufacturing | 2017 |
| BB Glass & Glazing Ltd | Construction | 2013 |
| BBQ Original Limited | Transport & logistics | 2015 |
| BBS Engineering Design Ltd | Professional & scientific | 2020 |
| BC Service and MOT Ltd | Wholesale & retail | 2023 |
| Bcams Academy Limited | Education | 2023 |
| BCL Solutions R&L Ltd | Construction | 2025 |
| Bcomp 535 Client Partners Limited Partnership | | 2020 |
| Bcomp 535 Limited | Financial services | 2020 |
| BCP Trans Ltd | Transport & logistics | 2018 |
| Bcuc (Services) Limited | Administrative & support | 1996 |
| BD Xpress Ltd | Hospitality | 2021 |
| BDC Legal Limited | Administrative & support | 2011 |
| BE Happy Childcare Services Limited | Health & social care | 2015 |
| BE the Music Limited | Other services | 2008 |
| Beacon & Diamond Executive Cars Ltd | Transport & logistics | 2017 |
| Beacon Aviation Limited | Transport & logistics | 2017 |
| Beacon Financial Consultancy Limited | Professional & scientific | 2007 |
| Beacon Funeral Services Ltd | Other services | 2000 |
| Beacon Hill Consulting Limited | Professional & scientific | 2019 |
| Beacon Hill Nature Reserve | Agriculture & fishing | 2011 |
| Beacon Planning Services Limited | Professional & scientific | 2024 |
| Beaconsfield Electrical Limited | Construction | 2021 |
| Beaglier Limited | Financial services | 2022 |
| Beamm Domestic Services Limited | Other services | 2014 |
| Beamtek Ltd | Manufacturing | 2025 |
| Bearandbullfx Ltd | Professional & scientific | 2022 |
| Beardons Ltd | Construction | 2019 |
| Beason-Brown Properties Ltd | Real estate | 2026 |
| Beattie & Co Holdings Ltd | Professional & scientific | 2023 |
| Beatzworkin Limited | Administrative & support | 2010 |
| Beaumont, Lawrence & Co. Limited | Financial services | 1973 |
| Beautiful Death Theatre Ltd | Arts & recreation | 2024 |
| Beautiful Homes of Beaconsfield Limited | Construction | 2019 |
| Beauty & Beast Store Traders Ltd | Wholesale & retail | 2024 |
| Beauty Box by Dani Ltd | Other services | 2020 |
| Beauty Star Salon Ltd | Other services | 2017 |
| Beaux Management Group Limited | Professional & scientific | 2025 |
| BEC WW Ltd | Wholesale & retail | 2023 |
| Becca Watson Limited | Other services | 2023 |
| Becci Dive Ltd | Professional & scientific | 2026 |
| Bechouse Limited | Professional & scientific | 2017 |
| Beckel Associates UK Limited | Professional & scientific | 2014 |
| Bede Group Academy Ltd | Arts & recreation | 2022 |
| Bedfordshire Plant Sales Limited | Wholesale & retail | 1984 |
| Bediako DAN Limited | Health & social care | 2019 |
| BEE a Holdings Ltd | Real estate | 2025 |
| BEE Aesthetics Ltd | Other services | 2024 |
| BEE Warm Limited | Construction | 2020 |
| Beech Tree High Wycombe Ltd | Hospitality | 2026 |
| Beechdean Dairy Ice Cream Ltd | Manufacturing | 2022 |
| Beechdean Ice Cream Limited | Manufacturing | 2022 |
| Beechdean Limited | Manufacturing | 2022 |
| Beechdean Manufacturing Ltd | Manufacturing | 2001 |
| Beechdean Motorsport Limited | Arts & recreation | 2001 |
| Beechfield Property Ltd | Real estate | 2026 |
| Beechwood Mansions, Freehold Management Co. Limited | Households | 2007 |
| Beechwood Shirts & Litho Limited | Manufacturing | 1995 |
| Beechwood View Management Company Limited | Households | 2005 |
| Beemtana Ltd | Health & social care | 2026 |
| Beeskneesexecutive Ltd | Transport & logistics | 2025 |
| Befabulous Technology CIC | Information & communication | 2025 |
| Beggars Moon Ltd | Construction | 2024 |
| Beknowin Limited | Information & communication | 2018 |
| Beladi Ltd | Professional & scientific | 2022 |
| Belle Craft Limited | Hospitality | 2024 |
| Bellers Consulting Ltd | Professional & scientific | 2014 |
| Bellhouse Innovations Limited | Wholesale & retail | 2017 |
| Bells & Two Tones Fire & Rescue Limited | Arts & recreation | 2015 |
| Bellus Cafe Ltd | Hospitality | 2025 |
| Belma Ltd | Manufacturing | 2025 |
| Belo Construction Ltd | Construction | 2019 |
| Beltability Ltd | Manufacturing | 1997 |
| Bemore Group Ltd | Health & social care | 2025 |
| BEN Atkinson Method Limited | Manufacturing | 2023 |
| BEN Boden Services Ltd | Construction | 2000 |
| BEN Konsult Limited | Real estate | 2023 |
| BEN Snow Music Ltd | Information & communication | 2020 |
| BEN Varnam Limited | Information & communication | 2026 |
| Benblue Limited | Real estate | 1986 |
| Benbridge Project Management Limited | Construction | 2011 |
| Benefiction Pictures Ltd | Information & communication | 2026 |
| Benford UV Ltd | Construction | 2024 |
| Benison Capital Limited | Real estate | 2016 |