| B.E.C. Concessions Ltd | Hospitality | 2015 |
| Baafi Limited | Real estate | 2025 |
| Backup Traders Ltd | Wholesale & retail | 2014 |
| Baesic. Ltd | Wholesale & retail | 2020 |
| Baldwin Property Limited | Real estate | 2025 |
| Balkan SD Ltd | Transport & logistics | 2024 |
| Baltic CDP Ltd | Transport & logistics | 2020 |
| Balticum Crsp Ltd | Transport & logistics | 2024 |
| Bam-Mika Ltd | Health & social care | 2022 |
| Banjoko Holdings Ltd | Extraterritorial | 2020 |
| Barawell Ltd | Health & social care | 2024 |
| Barking Healthcare Ltd | Health & social care | 2021 |
| Basartsteel Limited | Construction | 2022 |
| Basileia Concepts Ltd | Construction | 2024 |
| Bastico Property Limited | Hospitality | 2026 |
| BAX Steel Fixing Ltd | Construction | 2015 |
| Baxtom Delivery Ltd | Transport & logistics | 2020 |
| BBG Solution Ltd | Construction | 2023 |
| Bbna Group Limited | Real estate | 2023 |
| BC Exclusive Limited | Wholesale & retail | 2020 |
| BC Magnetom Limited | Health & social care | 2023 |
| Beacon Hill Academy | Education | 2012 |
| Beatrice Health Care Limited | Administrative & support | 2022 |
| Beautiful Things Ventures Limited | Wholesale & retail | 2021 |
| Beauty by MEL Ltd | Wholesale & retail | 2023 |
| Beauty Divine Limited | Other services | 2025 |
| Bee-Seal Ltd | Construction | 2021 |
| Beechcroft Healthcare Ltd | Health & social care | 2022 |
| Beeoler Ltd | Health & social care | 2018 |
| Beer Co London Ltd | Administrative & support | 2025 |
| Bega Construction Limited | Construction | 2020 |
| Beigel&Co. Ltd | Hospitality | 2026 |
| Belhus Construction Ltd | Construction | 2019 |
| Belhus Joinery Ltd | Construction | 2023 |
| Belhus Wines Ltd | Wholesale & retail | 2026 |
| Belivia Property Group Ltd | Real estate | 2021 |
| Bell & Martin Ltd | Construction | 2020 |
| Belnash Limited | Health & social care | 2020 |
| Bema Serviced Accommodation Limited | Real estate | 2025 |
| Bené Official Ltd | Wholesale & retail | 2025 |
| Berfrepet Limited | Wholesale & retail | 2025 |
| Berkley Nine (Management) Limited | Construction | 2018 |
| Bespoke London Holdings Limited | Professional & scientific | 2025 |
| Bespoke Metal Components Ltd | Manufacturing | 2026 |
| Best Care Medical Services Ltd | Health & social care | 2013 |
| Best Tiling Limited | Construction | 2022 |
| Betu Cargos Limited | Wholesale & retail | 2021 |
| Big 7 Holdings Ltd | Financial services | 2025 |
| Big Rigging Ltd | Information & communication | 2024 |
| Bijou Interiors Ltd | Construction | 2021 |
| Bilozir Facade Ltd | Construction | 2021 |
| Biodigital Tech Solutions Limited | Hospitality | 2025 |
| Black Dome Limited | Wholesale & retail | 2023 |
| Blind Gallery (UK) Ltd | Manufacturing | 2020 |
| Blossom Care Facilities & Management Services Ltd | Health & social care | 2024 |
| Blue Etherium Limited | Construction | 2020 |
| Blue Rose XIV Limited | Professional & scientific | 2020 |
| Blue Yellow Ltd | Transport & logistics | 2017 |
| Bluerock Plant and Tool Hire Ltd | Administrative & support | 2026 |
| Blush Hair & Beauty Studio Ltd | Other services | 2024 |
| BM Accounting Limited | Professional & scientific | 2015 |
| BM Construct Limited | Construction | 2024 |
| BNA Contract Services Ltd | Transport & logistics | 2015 |
| Bobl Engineering Ltd | Other services | 2025 |
| Bobu Transport Ltd | Transport & logistics | 2022 |
| Boiyer Jahaj Ltd | Information & communication | 2020 |
| Bojerta Services Limited | Other services | 2020 |
| BOK Limited | Construction | 2015 |
| Bolagoke Ltd | Real estate | 2026 |
| Bold Advertising Ltd | Education | 2022 |
| Bold Paths Limited | Information & communication | 2024 |
| Bolshade Limited | Health & social care | 2024 |
| Bordervale Limited | Health & social care | 2022 |
| Bosana Ltd | Health & social care | 2023 |
| Boutiqo London Ltd | Wholesale & retail | 2023 |
| Bozez Limited | Wholesale & retail | 2007 |
| Bravius Ltd | Manufacturing | 2022 |
| Bright Choice Retail Ltd | Wholesale & retail | 2021 |
| Brightline Decorators Limited | Construction | 2024 |
| Britannia Force Ltd | Administrative & support | 2020 |
| Brownie Bar London Ltd | Manufacturing | 2026 |
| Brutallis Ltd | Wholesale & retail | 2019 |
| BSM Investment Holdings Ltd | Real estate | 2021 |
| BSM Properties Limited | Real estate | 2018 |
| BSR Health Care Ltd | Health & social care | 2023 |
| Bstone Property Ltd | Real estate | 2020 |
| Budget Tyre Maintenance Limited | Manufacturing | 2010 |
| Build Master Solution Limited | Construction | 2026 |
| Build With ME Ltd | Construction | 2025 |
| Build-Pro Builders Ltd | Construction | 2025 |
| Building Capacity Ltd. | Professional & scientific | 2023 |
| Buildpilot Ltd | Information & communication | 2025 |
| Built by Lama Ltd | Construction | 2025 |
| Bumbble Video Games Limited | Information & communication | 2025 |
| Bunn's Tagada Ltd | Arts & recreation | 2026 |
| Buon Appetit Catering Ltd | Hospitality | 2022 |
| BURAK27 Ltd | Hospitality | 2025 |
| Burkat INK Ltd | Manufacturing | 2025 |
| Busila Logistics Limited | Transport & logistics | 2025 |
| Buy Car Ltd | Wholesale & retail | 2023 |