| Boosttel Ltd | Information & communication | 2025 |
| Booth OXF Ltd | Wholesale & retail | 2023 |
| Boothique Azzies Limited | Extraterritorial | 2026 |
| Boothretail Limited | Wholesale & retail | 2025 |
| Bootsy Couture Ltd | Manufacturing | 2024 |
| Booty Buddy Ltd | Wholesale & retail | 2015 |
| Booty Property Group Ltd | Real estate | 2026 |
| Bopmh Group Limited | Information & communication | 2025 |
| Border Bean Limited | Hospitality | 2012 |
| Border Care Ltd | Other services | 2016 |
| Border Property Investments Limited | Real estate | 2021 |
| Borealis Yachting Ltd | Extraterritorial | 2025 |
| Borrowby Ltd | Construction | 2020 |
| Boscimeno Appliances Co., Ltd. | Manufacturing | 2024 |
| Boson Accountants Ltd | Professional & scientific | 2023 |
| Botagus Ltd | Wholesale & retail | 2024 |
| Botany Squared Limited | Wholesale & retail | 2019 |
| Bough Prime Ltd | Wholesale & retail | 2025 |
| Bounce Training, Coaching & Development Ltd | Other services | 2012 |
| Boundless Clothing and Accessories Ltd | Wholesale & retail | 2021 |
| Boundless Guizhou Limited | Information & communication | 2025 |
| Boundless Liability Limited | Wholesale & retail | 2025 |
| Bourgas Limited | Construction | 2026 |
| Bouslimi Ltd | Information & communication | 2025 |
| BOW Horizon Ltd | Professional & scientific | 2026 |
| Bower HR Ltd | Administrative & support | 2016 |
| Bowline Ltd | Information & communication | 2022 |
| Bozongo Limited | Wholesale & retail | 2023 |
| BPE Consulting Ltd | Professional & scientific | 2026 |
| BPO Holding LLP | | 2017 |
| BPT 26 Ltd | Hospitality | 2026 |
| Bpteot Limited | Extraterritorial | 2022 |
| Bpws International Ltd | Professional & scientific | 2026 |
| Bracknell Transport Services Ltd | Transport & logistics | 2021 |
| Braco Limited | Health & social care | 2022 |
| Bradcad Limited | Professional & scientific | 2025 |
| Brainbase Limited | Information & communication | 2021 |
| Braivya Ltd | Wholesale & retail | 2025 |
| Brand Source and Supply Ltd | Wholesale & retail | 2026 |
| Brandaura Limited | Information & communication | 2024 |
| Branded My Way Limited | Manufacturing | 2024 |
| Brandfuture Ltd | Information & communication | 2024 |
| Brantwoods Limited | Real estate | 2022 |
| Brasam Ltd | Information & communication | 2018 |
| Brava Gatherings Ltd | Education | 2026 |
| Bravo ACO Ltd | Water & waste | 2025 |
| Bray Affiliates Ltd | Professional & scientific | 2021 |
| Brayrock Holdings Limited | Financial services | 2024 |
| Brayrock Investments Limited | Financial services | 2025 |
| Brayrock Property Company Limited | Real estate | 2024 |
| Braz Books Ltd | Information & communication | 2024 |
| Brazil & Co (Steel) Limited | Manufacturing | 2009 |
| Breakfast and Co Limited | Hospitality | 2025 |
| Breakfast'N'Bakes Ltd | Hospitality | 2024 |
| Breathefife Limited | Health & social care | 2023 |
| Brembo Ltd | Manufacturing | 2025 |
| Bressler Richam Ltd | Wholesale & retail | 2025 |
| Brew + Boosters CIC | Wholesale & retail | 2026 |
| Brew Craft Coffee Ltd | Other services | 2025 |
| Bribridge Ltd | Hospitality | 2025 |
| Brick and Click International Ltd | Information & communication | 2020 |
| Brickittco Limited | Wholesale & retail | 2025 |
| Briddo Ltd | Information & communication | 2020 |
| Bridge Africa Ltd | Professional & scientific | 2021 |
| Bridge River Valley Co., Ltd | Wholesale & retail | 2025 |
| Bridge to Equity Ltd | Professional & scientific | 2026 |
| Bridgegrade Analysis Limited | Information & communication | 1989 |
| Bridgepoint Consulting Limited | Professional & scientific | 2016 |
| Bridges Beyond Literacy CIC | Education | 2026 |
| Bridgespace CIC | Health & social care | 2025 |
| Bridgetell Trading Ltd | Wholesale & retail | 2024 |
| Bridgewater Park (Netherley) Management Company Limited | Households | 2008 |
| Brielle and Briar Ltd | Wholesale & retail | 2025 |
| Bright and Light Ltd | Wholesale & retail | 2024 |
| Bright Digital Ltd | Professional & scientific | 2014 |
| Bright INK Media Limited | Arts & recreation | 2026 |
| Bright Source Ltd | Other services | 2024 |
| Brightflow AI Ltd | Information & communication | 2025 |
| Brightlume Ltd | Wholesale & retail | 2025 |
| Brighton Fire Doors Ltd | Construction | 2024 |
| Brighton Vintage Shop Ltd | Wholesale & retail | 2021 |
| Brightport Trading Ltd | Manufacturing | 2025 |
| Brightstone Trading Ltd | Wholesale & retail | 2025 |
| Brightwell Commerce Ltd | Wholesale & retail | 2025 |
| Brilliantet Education Ltd | Wholesale & retail | 2023 |
| Brillion Ltd | Construction | 2023 |
| Brillmount Ltd | Construction | 2026 |
| Bringg Global Limited | Other services | 2025 |
| Brinkley Temprisher Ltd | Wholesale & retail | 2025 |
| Bristoc Miltshire Ltd | Wholesale & retail | 2025 |
| Bristol Entertainment Events Ltd | Administrative & support | 2025 |
| Brit Business Assistance Ltd | Administrative & support | 2026 |
| Britannia Finance & Capital Ltd | Financial services | 2025 |
| Britannia Media Collective Ltd | Wholesale & retail | 2026 |
| Britannia Property Limited | Real estate | 2022 |
| Britannia Verve Commerce Limited | Wholesale & retail | 2026 |
| Britassist Consulting Ltd | Professional & scientific | 2025 |
| Britcare Laboratorie Ltd | Manufacturing | 2024 |
| Britcartia Limited | Wholesale & retail | 2025 |
| Britconnect Solutions Limited | Transport & logistics | 2024 |