| BB Builders Group Limited | Construction | 2017 |
| BB Leyton High Road Foods Limited | Hospitality | 2026 |
| BB Nails Limited | Other services | 2019 |
| BB360 Ltd | Professional & scientific | 2021 |
| BBA NG Limited | Health & social care | 2018 |
| Bba-Reman Limited | Other services | 2002 |
| Bbbeautybar Limited | Other services | 2024 |
| Bbcc Limited | Wholesale & retail | 2025 |
| BBL Logistical Ltd | Other services | 2012 |
| BBL Technical Limited | Administrative & support | 2000 |
| Bbortho Ltd | Health & social care | 2013 |
| BBQ Kebab Ltd | Hospitality | 2024 |
| Bbqbloq Limited | Manufacturing | 2026 |
| BC Audio Visual Limited | Administrative & support | 2021 |
| BC Property Investments Limited | Real estate | 2014 |
| BCD Consulting and Development Ltd | Professional & scientific | 2020 |
| BCM Motor Repairs Ltd | Wholesale & retail | 2025 |
| BD Tools Ltd | Wholesale & retail | 2005 |
| BDE Construction Limited | Construction | 2020 |
| BE Different Bible College Limited | Other services | 2026 |
| BE One Property Ltd | Real estate | 2022 |
| BE Two Property Ltd | Real estate | 2025 |
| Beachcourt Limited | Administrative & support | 1991 |
| Beackon Tree Garden Services Ltd | Administrative & support | 2022 |
| Beacons of Light Children Home Ltd | Hospitality | 2024 |
| Beanpie Creative CIC | Information & communication | 2011 |
| Bear Hotels Limited | Real estate | 2025 |
| Bear Property Enterprises Limited | Real estate | 2015 |
| Beatpro Makeup Limited | Transport & logistics | 2020 |
| Beatrice Shilling Ltd | Information & communication | 2009 |
| Beautesp Ltd | Health & social care | 2024 |
| Beauti Link Ltd | Information & communication | 2025 |
| Beautiful World Ltd | Professional & scientific | 2023 |
| Beauty Aesthetic Clinic Limited | Other services | 2020 |
| Beauty Business Social Ltd | Information & communication | 2020 |
| Beauty Hubb Limited | Administrative & support | 2018 |
| Beauty NW5 Ltd | Other services | 2013 |
| Beauty Vault &Co Ltd | Other services | 2023 |
| Beauté Beyond the Surface Ltd | Other services | 2018 |
| Beavertown Brewery Ltd | Manufacturing | 2011 |
| Bebe Fabrics Ltd | Wholesale & retail | 2026 |
| Bebek Property Limited | Real estate | 2026 |
| Bebington Nails Limited | Other services | 2024 |
| Beckett Morgan Limited | Information & communication | 2025 |
| Beckford Surveying Services Limited | Financial services | 2025 |
| Beda Bedding Ltd | Wholesale & retail | 2016 |
| BEE BEE Nails Salon Limited | Other services | 2025 |
| BEE Herbal Ltd | Wholesale & retail | 2026 |
| BEE Sting Films Ltd | Information & communication | 2025 |
| Beechcroft Lodge (Enfield) Management Company Limited | Households | 2000 |
| Beechtree Capital Limited | Professional & scientific | 2024 |
| Beep Beep Recovery Limited | Manufacturing | 2023 |
| Beermatt Ltd | Hospitality | 2025 |
| Bees Group(Uk) Ltd | Construction | 2019 |
| Beess Limited | Hospitality | 2024 |
| Beets Mortgages Ltd | Financial services | 2019 |
| Beevital and Co Limited | Agriculture & fishing | 2025 |
| Begon Village Properties Ltd | Real estate | 2023 |
| Begu Property Ltd | Real estate | 2025 |
| Begum Maintenance Ltd | Other services | 2012 |
| Behrouzi Associates Limited | Professional & scientific | 1994 |
| Beks (INT) Ltd | Arts & recreation | 2025 |
| Bektas Care Ltd | Health & social care | 2024 |
| Bektas Properties Limited | Real estate | 2025 |
| BEL Transport Ltd | Transport & logistics | 2025 |
| Belamour LDN Ltd | Other services | 2021 |
| Belber Group Limited | Real estate | 2025 |
| Belet Teacher Classes Limited | Education | 2025 |
| Believe Only Limited | Information & communication | 2015 |
| Beliger Investments Ltd | Real estate | 2021 |
| Belissima Aesthetics Ltd | Health & social care | 2021 |
| Bella Nails Spa Limited | Other services | 2025 |
| Bella Personalised Gifts Ltd | Wholesale & retail | 2023 |
| Bellegin Limited | Wholesale & retail | 2022 |
| Bellevue Mortlakes Limited | Real estate | 2009 |
| Bellingham Consultancy Limited | Professional & scientific | 2026 |
| Bellissima LDN Ltd | Wholesale & retail | 2025 |
| Bellss Limited | Health & social care | 2020 |
| Belonging International Ltd | Administrative & support | 2016 |
| Belsize Hair Limited | Wholesale & retail | 2020 |
| BEN & Steve Ltd | Professional & scientific | 2008 |
| BEN Landscaping Ltd | Construction | 2018 |
| Benama Limited | Health & social care | 2024 |
| Benden Ltd | Manufacturing | 2024 |
| Bene-Fit Financial Consulting Limited | Professional & scientific | 2021 |
| Bener Ltd | Wholesale & retail | 2026 |
| Benfield Property Management Limited | Households | 1995 |
| Bengalsea Ltd | Hospitality | 2016 |
| Bengologic Ltd | Information & communication | 2025 |
| Beni Construction Ltd | Construction | 2019 |
| Beni House Ltd | Real estate | 2017 |
| Benice Turk Ltd | Wholesale & retail | 2025 |
| Benjamin James Design Limited | Professional & scientific | 2016 |
| Benny Tilling Ltd | Construction | 2018 |
| Berat Ltd | Financial services | 2025 |
| Berba Property Limited | Construction | 2025 |
| Beregard Management Company Limited | Professional & scientific | 1999 |
| Beren LLL Ltd | Transport & logistics | 2025 |
| Berfin My Ltd | Wholesale & retail | 2023 |
| Berins Kids Ltd | Wholesale & retail | 2024 |