| Blff Home Comforts Ltd | Real estate | 2025 |
| Bliss Mart Limited | Wholesale & retail | 2025 |
| Blissful Beauty Limited | Wholesale & retail | 2023 |
| Blissful Systems Limited | Information & communication | 2014 |
| Blistham Global Trade Ltd | Wholesale & retail | 2026 |
| Bloom Investment and Strategy Ltd | Professional & scientific | 2025 |
| Bloom Property Limited | Wholesale & retail | 2024 |
| Bloop Digital Ltd | Wholesale & retail | 2025 |
| Blossom and Pearl the Store Ltd | Wholesale & retail | 2025 |
| Blossom Wellness Limited | Wholesale & retail | 2025 |
| BLS Yacht Limited | Professional & scientific | 2026 |
| Blue Digital Marketing Limited | Wholesale & retail | 2022 |
| Blue Goat Books Ltd | Information & communication | 2025 |
| Blue Lemon Investigation Training Ltd | Administrative & support | 2023 |
| Blue Mango Media Group Ltd | Information & communication | 2020 |
| Blue PIG Creative Limited | Information & communication | 2024 |
| Blue Regent Ltd | Construction | 2025 |
| Blue Sky Events Ltd | Professional & scientific | 1999 |
| Blue Square Property Ltd | Construction | 2024 |
| Blue Stellaris Ltd | Professional & scientific | 2024 |
| Blue Sun Enterprises Ltd | Wholesale & retail | 2025 |
| Blue Tide Yachting Limited | Professional & scientific | 2025 |
| Blue Vega Consulting Ltd | Other services | 2020 |
| Blueaura Media Ltd | Information & communication | 2024 |
| Bluedevlabs Ltd | Information & communication | 2025 |
| Blueflare AI Ltd | Information & communication | 2025 |
| Bluejay Mindset LLP | | 2019 |
| Bluepeaked Ltd | Professional & scientific | 2026 |
| Bluesea International Office Ltd | Administrative & support | 2023 |
| Bluesquareclub Ltd | Manufacturing | 2025 |
| Bluewater Design & Management Ltd | Professional & scientific | 2016 |
| Bluewell Group Ltd | Wholesale & retail | 2025 |
| BLW Post Ltd | Information & communication | 2024 |
| BMH Arboricultural Ltd | Agriculture & fishing | 2023 |
| Bmjlj Ltd | Wholesale & retail | 2024 |
| BN Sports Distribution Limited | Wholesale & retail | 2025 |
| BNT Modding Ltd | Professional & scientific | 2022 |
| BO Art Tech Ltd | Wholesale & retail | 2026 |
| Board Stupid Ltd | Information & communication | 2024 |
| Board to Death Ltd | Wholesale & retail | 2025 |
| BOB PEN Ltd | Information & communication | 2020 |
| Boden Devices Limited | Manufacturing | 2024 |
| Bodii Technologies Ltd | Manufacturing | 2021 |
| Body Engagement Limited | Administrative & support | 2009 |
| Bohm Capital Limited | Financial services | 2022 |
| Boke Labs LLP | | 2025 |
| Bolide Brokers Limited | Wholesale & retail | 2025 |
| Bolt Investments Limited | Real estate | 2025 |
| Boltflare Ltd | Information & communication | 2019 |
| Bomb UP Airsoft & Ttpc Ltd | Manufacturing | 2017 |
| Bonded Wealth Investments Ltd | Real estate | 2024 |
| Bondok Media Ltd | Information & communication | 2025 |
| Bonington Loans Ltd | Information & communication | 2017 |
| Bonluck Ltd | Mining & quarrying | 2024 |
| Bonpsy Socio-Strategery Laboratories Limited | Professional & scientific | 2026 |
| Bonye Ltd | Wholesale & retail | 2024 |
| Bonzer Property Ltd | Real estate | 2023 |
| Booking Tracker Limited | Information & communication | 2011 |
| Books Publisher Limited | Information & communication | 2025 |
| Boombasteak Ltd | Hospitality | 2017 |
| Boostela Ltd | Wholesale & retail | 2025 |
| Boostup One Ltd | Wholesale & retail | 2025 |
| Booton Beck Ltd | Professional & scientific | 2021 |
| Bopma Ltd | Information & communication | 2026 |
| Borch Consulting Limited | Wholesale & retail | 2024 |
| Bordermax Investments Ltd | Wholesale & retail | 2025 |
| Borealis Studios Ltd | Information & communication | 2025 |
| Borelan UK Ltd | Administrative & support | 2013 |
| Bornaltus Ltd | Wholesale & retail | 2026 |
| Borrow & Build Limited | Administrative & support | 2024 |
| Bose Properties & Investments Ltd | Real estate | 2020 |
| Bosski Ltd | Wholesale & retail | 2024 |
| Bosy and Co Ltd | Wholesale & retail | 2024 |
| Botmedica Ltd | Information & communication | 2023 |
| Bounce & Bubbles Devon Ltd | Administrative & support | 2024 |
| Bound Works Ltd | Professional & scientific | 2026 |
| Boundarylab Ltd | Information & communication | 2025 |
| Bountifulbeings Limited | Health & social care | 2025 |
| Bountyvera Ltd | Wholesale & retail | 2026 |
| Bourne Free Ltd | Professional & scientific | 2018 |
| Boward Property Ltd | Real estate | 2026 |
| Boxfresh Comms Limited | Information & communication | 2019 |
| Boxing Highs Apparel Limited | Wholesale & retail | 2024 |
| BP Creative and Consultancy Services Ltd | Information & communication | 2023 |
| BP Waste and Removals Ltd | Water & waste | 2026 |
| Bpmh Limited | Administrative & support | 2026 |
| Bpnx Limited | Information & communication | 2003 |
| Brad Build (Builders/Contractors) Limited | Construction | 2016 |
| Bragtby Tech Limited | Wholesale & retail | 2026 |
| Brainedge Labs Ltd | Information & communication | 2025 |
| Brainey Ltd | Professional & scientific | 2024 |
| Brainstem Group UK CIC | Education | 2025 |
| Braintastic! Science Limited | Education | 2024 |
| BRAND424 Ltd | Wholesale & retail | 2025 |
| Brandloom Ltd | Information & communication | 2025 |
| Brandon Glass & Glazing Ltd | Construction | 2026 |
| Brantham Court Investments Limited | Financial services | 2025 |
| Bravanta Group LLP | | 2026 |
| Bravanti Ltd | Administrative & support | 2025 |
| Bravehurst Limited | Arts & recreation | 2023 |