| Bellevue Court (ST George) Management Limited | Households | 2006 |
| Bellhill Trading Ltd | Hospitality | 2022 |
| Bellillo Limited | Wholesale & retail | 2015 |
| Bellingham Property LLP | | 2017 |
| Bellmere Gardens Phase I Management Company Limited | Households | 2018 |
| Bellmere Gardens Phase II Management Company Limited | Households | 2018 |
| Bells - Education & Publishing Ltd | Information & communication | 2019 |
| Bells Refurbishment & Maintenance Ltd | Extraterritorial | 2016 |
| Bellsgrove Ltd | Health & social care | 2010 |
| Bellview Comms Limited | Information & communication | 2004 |
| Belmont Heights (NO.2) Residents Company Limited | Households | 1995 |
| Belmont Letting Ltd | Households | 2018 |
| Belmont Residence Ltd | Real estate | 2016 |
| Belsizearia Ltd | Manufacturing | 2025 |
| Belt BOY Recordings Ltd | Information & communication | 2026 |
| Belua Food Ltd | Hospitality | 2018 |
| Belux Wellness Ltd | Health & social care | 2026 |
| Bema Person Centred Care Consult Ltd | Health & social care | 2026 |
| Bemc Ltd | Construction | 2023 |
| Bempowered Corp. Ltd | Education | 2023 |
| Bemtoli Limited | Professional & scientific | 2019 |
| Bemyguesttattoo Ltd | Other services | 2026 |
| BEN Ansari Limited | Wholesale & retail | 2025 |
| BEN Bennett Films Limited | Professional & scientific | 2025 |
| BEN Gold Services Ltd | Construction | 2024 |
| BEN Joseph Joinery Limited | Manufacturing | 2016 |
| BEN Services Limited | Professional & scientific | 2014 |
| Benakams Services Ltd | Public administration | 2016 |
| Benchstrength International Limited | Professional & scientific | 2023 |
| Benco Builders Ltd | Construction | 2015 |
| Benedict O'Looney Architects Limited | Professional & scientific | 2025 |
| Benefyc Ltd | Construction | 2016 |
| Benet Agency Ltd | Professional & scientific | 2024 |
| Bengueloul Properties Limited | Real estate | 2023 |
| Benhill Stores Limited | Wholesale & retail | 2025 |
| Benjamal Coffee Shop Limited | Hospitality | 2010 |
| Bennirs Ltd | Wholesale & retail | 2025 |
| Benny's Cuisine & Catering Services Ltd | Administrative & support | 2010 |
| Benny’S Roofing Ltd | Construction | 2024 |
| Benod Services Ltd | Professional & scientific | 2019 |
| Benosa Ventures Ltd | Real estate | 2024 |
| Bensham Care Ltd | Health & social care | 2015 |
| Benson & Partners Limited | Real estate | 2002 |
| Bentech Solutions Limited | Information & communication | 2017 |
| Bentley Court Management Company (Spalding) Limited | Households | 2019 |
| Bentley South Management Company Limited | Households | 2008 |
| Bentleys Cafe in the Village Limited | Hospitality | 2025 |
| Bento Walla Limited | Hospitality | 2021 |
| Bept Global Ltd | Administrative & support | 2024 |
| Berbridge Roofing Company Limited | Extraterritorial | 1995 |
| Bergkamp & Bronze Ltd | Manufacturing | 2025 |
| Berisha Property Development Ltd | Construction | 2020 |
| Berkayla Ltd | Real estate | 2025 |
| Berkeley 24 Ltd | Professional & scientific | 2024 |
| Berkley Plant Ltd | Administrative & support | 2021 |
| Berkshire Bulldogs Limited | Arts & recreation | 2018 |
| Bernadette Fallon Ltd | Arts & recreation | 2022 |
| Bernanddeen Limited | Real estate | 2022 |
| Bernardo Psychological Services Ltd | Education | 2025 |
| Bernards Court Limited | Extraterritorial | 2015 |
| Berne Court Management Company Limited | Households | 2012 |
| Bernersmede Management Limited | Households | 2005 |
| Berry Legal Consultancy Service Limited | Professional & scientific | 2020 |
| Berrymain Limited | Real estate | 1973 |
| Berti Catering Ltd | Hospitality | 2025 |
| Berti Construction Ltd | Construction | 2018 |
| Besand Limited | Wholesale & retail | 2020 |
| Besor Group Limited | Health & social care | 2025 |
| Bespoke Eyecare Limited | Health & social care | 2014 |
| Bespoke Global Education Solutions Ltd | Education | 2025 |
| Bespoke Landscaping Garden Services Ltd | Administrative & support | 2023 |
| Bespoke Plumbing Solutions Ltd | Construction | 2019 |
| Bespoke Property GRP Limited | Real estate | 2017 |
| Bespoke Speech Writing Services Ltd | Professional & scientific | 2008 |
| Bespoke Window Systems Ltd | Manufacturing | 2000 |
| Best Buy Cars Limited | Wholesale & retail | 2018 |
| Best Fit Express Tyres Ltd | Wholesale & retail | 2022 |
| Best Fit Services Ltd | Wholesale & retail | 2020 |
| Best NBS Services Ltd | Wholesale & retail | 2014 |
| Best of Breed Limited | Arts & recreation | 2018 |
| Best Physique Ltd | Other services | 2025 |
| Best Tuition Point Ltd | Administrative & support | 2020 |
| Best Ways Logistic Services Ltd | Transport & logistics | 2019 |
| Bestbrows Limited | Other services | 2014 |
| Bestfood Supermarket Croydon Limited | Wholesale & retail | 2019 |
| Besthandyman Limited | Construction | 2015 |
| Bestonlineoffers Ltd | Wholesale & retail | 2022 |
| Bestspread International Limited | Financial services | 2019 |
| Besu Skin Ltd | Wholesale & retail | 2021 |
| BETA3 Limited | Wholesale & retail | 2004 |
| Bethlehem Rail Infrastructure Limited | Transport & logistics | 2008 |
| Better Bargain (Newcastle) Ltd | Wholesale & retail | 2021 |
| Better Call Gibbz Ltd | Construction | 2023 |
| Better Living Concept Limited | Households | 2018 |
| Better Property Solutions Limited | Other services | 2017 |
| Bettering Education Limited | Education | 2012 |
| Betterthanevermedia Ltd | Information & communication | 2025 |
| Betterway Care Ltd | Administrative & support | 2025 |
| Bettyliz Ltd | Health & social care | 2021 |
| Beulah Lodge Management Limited | Households | 1992 |