| Balaji Paramasivam Ltd | Wholesale & retail | 2026 |
| Balarabe Limited | Health & social care | 2025 |
| Banga Decoration Ltd | Construction | 2017 |
| Bano Group Ltd | Hospitality | 2024 |
| Banoo Ltd | Hospitality | 2016 |
| Bar Best Appliance Repair Ltd | Manufacturing | 2026 |
| Barbara Kopec Ltd | Manufacturing | 2026 |
| Barima Homecare Ltd | Construction | 2019 |
| Barr Enterprise Limited | Wholesale & retail | 2024 |
| Barrowgate Ltd | Real estate | 2025 |
| Barry Khan Ltd | Other services | 2026 |
| Bashir Romeo Toure Ventures UK Ltd | Other services | 2024 |
| Basil 1962 Limited | Extraterritorial | 2013 |
| Basil Decoration and Maintenance Ltd | Construction | 2016 |
| Bath Fitters Ltd | Construction | 2018 |
| Bayba Investments Limited | Real estate | 2025 |
| Bayview Villas Ltd | Real estate | 2024 |
| BCB Medicare Ltd | Health & social care | 2014 |
| BCS Worldwide Ministries Limited | Other services | 2014 |
| BDC Supporting Services Ltd | Extraterritorial | 2010 |
| BE Fairall Limited | Wholesale & retail | 2018 |
| Bean Talk Productions Ltd | Information & communication | 2026 |
| Beautees Cosmetics Ltd | Wholesale & retail | 2018 |
| Beautiful Books Boutique Ltd | Information & communication | 2025 |
| Beautiful LIE Limited | Wholesale & retail | 2019 |
| Beautiful Treat Ltd | Other services | 2025 |
| Beauty and Nail Place Ltd | Other services | 2023 |
| Beauty at Niha Ltd | Other services | 2020 |
| Beauty Shop London Ltd | Administrative & support | 2016 |
| Bebusy Limited | Information & communication | 2012 |
| Beckas Beauty Limited | Other services | 2021 |
| Beckyross Ltd | Professional & scientific | 2016 |
| BEE Different London Ltd | Manufacturing | 2025 |
| Behanlolo Ltd | Manufacturing | 2022 |
| Bejan Clothing Limited | Wholesale & retail | 2022 |
| Bekek Ltd | Professional & scientific | 2023 |
| Bel'Vestitii Limited | Health & social care | 2022 |
| Belacosmetiics.Uk Ltd | Wholesale & retail | 2026 |
| Bella's Juice Bar & Patisserie Limited | Manufacturing | 2025 |
| Belle-Vous Salon LP | | 2011 |
| Bellevue Property Management Ltd | Households | 2015 |
| Bencham Chicken Ltd | Hospitality | 2023 |
| Bensham Housing Ltd | Real estate | 2019 |
| Bensham Investments Limited | Administrative & support | 2017 |
| Besmore Groundwork Ltd | Construction | 2026 |
| Best Autos Group Limited | Wholesale & retail | 2026 |
| Best Cleaning 77 Limited | Administrative & support | 2021 |
| Beulah Church | Other services | 2005 |
| Beulah Investments Limited | Health & social care | 2019 |
| Beulah Mini Academy Ltd | Education | 2025 |
| Beyond Expectation Services Limited | Other services | 2025 |
| BFA Distributions Ltd | Wholesale & retail | 2026 |
| BH73 Ltd | Information & communication | 2018 |
| BH73 Realty Ltd | Real estate | 2019 |
| Bhaiji and Sons Ltd | Wholesale & retail | 2024 |
| Bharat Shah & Co Limited | Professional & scientific | 2012 |
| Bhoomi Spices Ltd | Wholesale & retail | 2026 |
| Bhousing Ltd | Real estate | 2026 |
| BIA Beauty Ltd | Other services | 2017 |
| Bibuild Developments Limited | Construction | 2003 |
| Biggz Community Kitchen CIC | Administrative & support | 2025 |
| Bigrhymes Limited | Administrative & support | 2023 |
| Bilz Dealz Limited | Wholesale & retail | 2023 |
| Binjojo Building Maintenance Ltd | Construction | 2023 |
| Binty's Kitchen Limited | Hospitality | 2022 |
| Birkbeck Estates Ltd | Real estate | 2016 |
| Bita Cosmetics Limited | Extraterritorial | 2010 |
| Bitesize Digital School CIC | Information & communication | 2025 |
| Bizup Ltd | Wholesale & retail | 2026 |
| Bizzar Bazaar Ltd | Wholesale & retail | 2026 |
| Bjay Property Maintenance and Building Services Limited | Construction | 2013 |
| BKR Consulting Limited | Real estate | 2015 |
| Black Gold Alliance Ltd | Professional & scientific | 2019 |
| Black Teachers Connect CIC | Education | 2021 |
| Blackstone Enterprises Ltd | Wholesale & retail | 2023 |
| Blackstone Protection Group Ltd | Administrative & support | 2025 |
| Blakes MOT and Service Centre Ltd. | Wholesale & retail | 2019 |
| Blanc Canvas Balloons Limited | Arts & recreation | 2022 |
| Blank Tile Limited | Information & communication | 2018 |
| Blessed Collection Ltd | Wholesale & retail | 2025 |
| BLG 1 Limited | Construction | 2018 |
| Blinkora Ltd | Wholesale & retail | 2025 |
| Bloom in Nature Childcare Limited | Health & social care | 2020 |
| Blue & Orange 2023 Limited | Hospitality | 2023 |
| Blue and Orange Online Ltd | Wholesale & retail | 2023 |
| Blue Skies Properties Ltd | Real estate | 2020 |
| Blue Tide Studios Limited | Information & communication | 2025 |
| Blueberry Kitchen Limited | Hospitality | 2021 |
| Bluetona Ltd | Information & communication | 2022 |
| BM Events Ltd | Administrative & support | 2024 |
| BMG Creative Collective Limited | Information & communication | 2024 |
| BMX Supplies Ltd | Wholesale & retail | 2025 |
| Boba Tigers Croydon Ltd | Hospitality | 2026 |
| Bobby Builders and Landscapers Ltd | Construction | 2023 |
| Bodycraft Physio and Fitness Limited | Health & social care | 2024 |
| Bodyenrich Ltd | Manufacturing | 2012 |
| Boldak & Boba Ltd | Hospitality | 2025 |
| Borralho Property Management Ltd | Real estate | 2019 |
| Bosamai Co. Limited | Health & social care | 2012 |
| Bossman Global Limited | Other services | 2025 |