| Babsolo Ltd | Other services | 2012 |
| Babul and Suite Cafe Ltd | Hospitality | 2022 |
| Babul Cafe Ltd | Hospitality | 2017 |
| Baby Buntins Ltd | Wholesale & retail | 2006 |
| BAC Education Consultancy Ltd | Education | 2017 |
| BAC Engineering and Investment Limited | Real estate | 2024 |
| BAC Investments UK Ltd | Real estate | 2020 |
| Badwal Studios Ltd | Information & communication | 2024 |
| BAE Frontier Labs Limited | Real estate | 2026 |
| Bageshwari Properties Ltd | Real estate | 2026 |
| Bahaghari Limited | Health & social care | 2021 |
| Baidex Connect Ltd | Transport & logistics | 2025 |
| Baileys Furniture Limited | Wholesale & retail | 2021 |
| Baines Property and Wealth Ltd | Real estate | 2024 |
| Baked Sisters Ltd | Wholesale & retail | 2026 |
| Baker-Healey (Contracts) Limited | | 1964 |
| Balaclava Inn Ltd | Real estate | 2023 |
| Ballard Court (42 Hatherley Road, Sidcup) Management Limited | Real estate | 1988 |
| Ballet Boost Limited | Arts & recreation | 2018 |
| Balmsound Limited | Professional & scientific | 1996 |
| Baltica Digital Ltd | Information & communication | 2024 |
| Bambi Homes Limited | Real estate | 2026 |
| Bamicrafts Ltd | Manufacturing | 2025 |
| Banah Ventures Ltd | Transport & logistics | 2024 |
| Banerjee Urology Services Limited | Health & social care | 2022 |
| Banner House Support Services Limited | Health & social care | 2019 |
| Banqfar Ltd | Information & communication | 2025 |
| Bansun UK Limited | Health & social care | 2011 |
| BAO Investments Limited | Health & social care | 2016 |
| Baragon Ltd | Real estate | 2022 |
| Barba Motorcycles Ltd | Wholesale & retail | 2024 |
| Barbara Palmer Health Ltd | Health & social care | 2024 |
| Barbedwire Tours Ltd | Administrative & support | 2014 |
| Bargain Tyres (Essex) Ltd | Wholesale & retail | 2020 |
| Barhys Limited | Professional & scientific | 2025 |
| Barker Business Limited | Construction | 2009 |
| Barracuda Equipment Limited | Manufacturing | 1981 |
| Barramundi Camps Limited | Health & social care | 2025 |
| Barritt Fire Doors Ltd | Construction | 2026 |
| Bars Build Ltd | Construction | 2020 |
| Bars Build Real Estate Ltd | Real estate | 2024 |
| Barss Tech Ltd | Information & communication | 2024 |
| Basai Limited | Real estate | 2026 |
| Basava Samithi of United Kingdom | Administrative & support | 2016 |
| Baseliners Ltd | Professional & scientific | 2025 |
| Bashipro Ltd | Real estate | 2023 |
| Basileia Consulting Limited | Wholesale & retail | 2015 |
| Basileia Homes Ltd | Health & social care | 2024 |
| Basileia Property Holdings Ltd | Real estate | 2019 |
| Bates Employee Ownership Trust Limited | Professional & scientific | 2025 |
| Bathroom Brands Group Limited | Financial services | 2016 |
| Bathroom Brands Holdings UK Limited | Wholesale & retail | 2009 |
| Bathroom Brands Limited | Financial services | 2017 |
| Bathroom Creations Limited | Construction | 2026 |
| Bathson Ltd | Administrative & support | 2008 |
| Baton Ridge Investment Ltd | Wholesale & retail | 2023 |
| Bats Group Ltd | Transport & logistics | 2009 |
| Battle Beard Ltd | Other services | 2024 |
| Bay Tree House (Gravesend) Limited | Health & social care | 2015 |
| Baykesbybee Ltd | Manufacturing | 2026 |
| Baymoon Integrated Services Ltd | Administrative & support | 2023 |
| Bayview Property Services Ltd | Construction | 2021 |
| BAZ Engineering Ltd | Professional & scientific | 2022 |
| BB Creatives Ltd | Real estate | 2025 |
| Bb&A Consultancy Ltd | Professional & scientific | 2024 |
| Bbespoke Ltd | Wholesale & retail | 2015 |
| Bbhomes Properties Limited | Real estate | 2025 |
| BBL Building Equipment Ltd | Water & waste | 2018 |
| BBL Management Limited | Financial services | 2022 |
| BBO Group Ltd | Construction | 2025 |
| BC Balloons Ltd | Arts & recreation | 2020 |
| Bc&G Limited | Construction | 2025 |
| BCB Consulting Ltd | Professional & scientific | 2019 |
| BCS Group Services Limited | Construction | 2023 |
| BDB Couriers Ltd | Transport & logistics | 2022 |
| BDB Properties Ltd | Real estate | 2020 |
| Bdcom UK Limited | Information & communication | 2004 |
| BDL Construction Ltd | Construction | 2017 |
| BDP International UK Limited | Transport & logistics | 1970 |
| Bdpm Group Ltd | Professional & scientific | 2024 |
| BE Cycle C.I.C. | Education | 2024 |
| BE Safe Direct Limited | Wholesale & retail | 2010 |
| BE Sure Couriers Ltd | Transport & logistics | 2016 |
| BE Therapy Ltd | Health & social care | 2025 |
| BE True 2 U Therapies Ltd | Health & social care | 2023 |
| Be-Connect Ltd | Information & communication | 2019 |
| Be-Connect PAY Ltd | Professional & scientific | 2024 |
| Be.Sofa Limited | Wholesale & retail | 2018 |
| Bea-Nathan Ltd | Transport & logistics | 2023 |
| Beacon Housing Limited | Real estate | 2020 |
| Beaming Bubs Ltd | Education | 2021 |
| Bean Sports Club Ltd | Education | 2025 |
| Bearsted Trading Fulfilment Ltd | Transport & logistics | 2021 |
| Beatgrasp Limited | Professional & scientific | 1996 |
| Beatricemak Limited | Health & social care | 2018 |
| Beatty House Ltd | Hospitality | 2021 |
| Beaudella Consultancy Limited | Information & communication | 2023 |
| Beautiful Bloom Ltd | Wholesale & retail | 2026 |
| Beautiful Nails (Dartford) Limited | Other services | 2015 |
| Beauty by NAZ Ltd | Other services | 2018 |