| Battersea Cafes Ltd | Hospitality | 2021 |
| Battersea Pizza Ltd | Hospitality | 2017 |
| Battledown Estates Limited | Real estate | 2017 |
| Battlekart UK Ltd | Information & communication | 2024 |
| Bauer & North Limited | Professional & scientific | 2025 |
| Bavaghan Estates Ltd | Real estate | 2026 |
| Baxters Companions Ltd | Health & social care | 2021 |
| Bay & IYE Ltd | Wholesale & retail | 2017 |
| Bay Capital Investment UK Ltd | Information & communication | 2025 |
| Baylegat Ltd | Real estate | 2015 |
| Baytree Homes Limited | Construction | 2021 |
| BB Land Ltd | Construction | 2023 |
| BB Parker Limited | Real estate | 2019 |
| BBL Renovations Ltd | Real estate | 2022 |
| Bbmar Vaughan Centre Limited | Construction | 2015 |
| BBR Shieldworks Ltd | Wholesale & retail | 2025 |
| Bcln Group Ltd | Wholesale & retail | 2026 |
| BDC (Glos) Ltd | Other services | 2012 |
| BDW Carpentry Ltd | Construction | 2012 |
| BE Carpentry Limited | Construction | 2023 |
| BE Trends Ltd | Other services | 2018 |
| Beacon Channel Insights Ltd | Professional & scientific | 2021 |
| Beamish Management Services Limited | Hospitality | 2006 |
| Bear Development Group Ltd | Construction | 2020 |
| Bear Grills @ Ltd | Hospitality | 2021 |
| Bear Investment Group Ltd | Real estate | 2023 |
| Beard and Barnet Barbers Ltd | Other services | 2026 |
| Beard and Barnet Gloucester Ltd | Other services | 2025 |
| Beard Evans Joinery Ltd | Manufacturing | 1964 |
| Beard Group Ltd | Real estate | 1975 |
| Beau Hair Studio Ltd | Other services | 2019 |
| Beau Monde Hair & Beauty Limited | Other services | 2005 |
| Beauty & the Baker Ltd | Other services | 2024 |
| Beauty Treatments Group Ltd | Wholesale & retail | 2025 |
| Bebe Hotels Ltd | Hospitality | 2025 |
| Becki&Lucas Transport Ltd | Transport & logistics | 2022 |
| Beckside Court Management Co Ltd | Households | 2000 |
| Becky Guth Ltd | Professional & scientific | 2022 |
| Beechkeys Limited | Education | 2007 |
| Beechkeys Properties Limited | Real estate | 2009 |
| Beechmore Developments Limited | Real estate | 2017 |
| Beechwood Funeral Services Ltd | Other services | 2008 |
| Beechwood Property and Estate Ltd | Real estate | 2022 |
| Beelightful Ltd | Agriculture & fishing | 2024 |
| Beercaddy Limited | Manufacturing | 2014 |
| Beet Cheltenham Limited | Hospitality | 2023 |
| Beeta Infrastructure Ltd | Construction | 2026 |
| Begum Caterers Limited | Hospitality | 2019 |
| Beinghuman Ltd | Information & communication | 1993 |
| Belgrave Building Ltd | Construction | 2022 |
| Belgrave Developments Limited | Real estate | 2005 |
| Believe in Beyond CIC | Health & social care | 2025 |
| Believe Interiors Ltd | Manufacturing | 2025 |
| Bell Self Storage Ltd | Transport & logistics | 2017 |
| Bell Tools Limited | Wholesale & retail | 2003 |
| Bell Walk Healthcare Ltd | Wholesale & retail | 2018 |
| Bella Casa Rentals Ltd | Households | 2025 |
| Bella Construction Limited | Construction | 2003 |
| Bella MIA Kitchen Ltd | Hospitality | 2020 |
| Bella MIA Pizza Limited | Hospitality | 2026 |
| Bellacassa Ltd | Wholesale & retail | 2025 |
| Bellchurch Developments Limited | Information & communication | 1984 |
| Belle and Bramble Interiors Ltd | Wholesale & retail | 2023 |
| Belle VUE Mansions Management Limited | Households | 2005 |
| Bells Amusements Limited | Arts & recreation | 2022 |
| Bellsure Holdings Limited | Administrative & support | 2019 |
| Bellsure Supplies Limited | Professional & scientific | 2009 |
| Bellwoods Limited | Extraterritorial | 2008 |
| Belringer Properties Limited | Real estate | 2015 |
| Belts and Braces Flat Roofing Ltd | Construction | 2025 |
| Belts and Braces Roofing Ltd | Construction | 2022 |
| Belvedere Management Properties LLP | | 2022 |
| Belview Transport Ltd | Transport & logistics | 2016 |
| BEN Allen Golf & Leisure Limited | Real estate | 2016 |
| BEN Arthur Media Ltd | Information & communication | 2023 |
| BEN Creese Country Butchers Ltd | Wholesale & retail | 2007 |
| BEN Long Falconry Limited | Manufacturing | 2011 |
| Bendall Metal Recycling Ltd | Water & waste | 2011 |
| Benefact Broking & Advisory Holdings Limited | Professional & scientific | 2022 |
| Benefact Group PLC | Professional & scientific | 1983 |
| Benefact Management Services Limited | Extraterritorial | 1984 |
| Benefact Trust Limited | Administrative & support | 1972 |
| Benjamin I Limited | Wholesale & retail | 2025 |
| Benjamin James Watch Company Limited | Wholesale & retail | 2025 |
| Bennett Gould and Partners (Dorset) Limited | Financial services | 2000 |
| Bennett Gould and Partners Limited | Financial services | 1972 |
| Bennett Project Solutions Ltd | Professional & scientific | 2025 |
| Bennetts Coaches Holdings Limited | Transport & logistics | 2017 |
| Bennetts Coaches Limited | Transport & logistics | 2010 |
| Bennetts Cranes Limited | Administrative & support | 2008 |
| Bennetts Dog House Limited | Hospitality | 2025 |
| Bennetts Driving Ltd | Education | 2018 |
| Bennetts Driving School Limited | Education | 2009 |
| Benorla Testing Ltd | Information & communication | 2015 |
| Bentley Property Limited | Real estate | 2020 |
| Berg Partnership Limited | Professional & scientific | 2012 |
| Berivan Properties Ltd | Real estate | 2025 |
| Berkley Energy Limited | Real estate | 2015 |
| Berrends Farm Holidays Ltd | Hospitality | 2024 |
| Berry Connections Ltd | Professional & scientific | 2024 |