| Bridge Fleet Solutions Limited | Administrative & support | 2003 |
| Bridge Gate Services Limited | Administrative & support | 2020 |
| Bridge Green Solutions Ltd | Administrative & support | 2023 |
| Bridge Management Systems Limited | Administrative & support | 2019 |
| Bridge Power Limited | Wholesale & retail | 2020 |
| Bridge Security Domestic Limited | Administrative & support | 2018 |
| Bridge Security Investments Limited | Administrative & support | 2003 |
| Bridge Security Solutions Limited | Administrative & support | 2017 |
| Bridgenow Limited | Information & communication | 2024 |
| Bridget Brooks Ltd | Real estate | 2025 |
| Bridgeway Legacy Planning Ltd | Other services | 2025 |
| Bridgwater 18 Limited | Construction | 2023 |
| Bright Front Limited | Real estate | 2021 |
| Bright Minds Tutoring Limited | Education | 2022 |
| Bright Properties UK E Ltd | Construction | 2015 |
| Bright Property Maintenance Ltd | Construction | 2025 |
| Bright Sky Investments 2 Limited | Real estate | 2018 |
| Bright Sky Investments Limited | Real estate | 2016 |
| Brightdebeauty Ltd | Education | 2019 |
| Brighter Paths Services Ltd | Health & social care | 2022 |
| Brighton & Hove PUB Company Limited | Hospitality | 2006 |
| Brighton Lease Co Limited | Real estate | 2026 |
| Brighton Road (Redhill) Ltd | Construction | 2022 |
| Brightpadproperty Ltd | Households | 2020 |
| Brightsky Management Limited | Real estate | 2014 |
| Brightwater Memorial Park Ltd | Other services | 2017 |
| Brilliant Telecommunications Limited | Information & communication | 2025 |
| Britannia Homestay Ltd | Hospitality | 2024 |
| Briteuro Limited | Information & communication | 2026 |
| British Wholesale Fruit and Vegetable Supplies Limited | Wholesale & retail | 1940 |
| Britnell Limited | Financial services | 2022 |
| Britot Ltd | Manufacturing | 2011 |
| Britton Group Ltd | Water & waste | 2020 |
| Brixmont Ltd | Construction | 2025 |
| Brixton Graphic Ltd | Professional & scientific | 2017 |
| Brixton Hill Court RTM Company Limited | Households | 2012 |
| BRJ Homes Ltd | Real estate | 2026 |
| Brmk Investments Limited | Real estate | 2026 |
| Broad Home Care Ltd | Health & social care | 2026 |
| Broadcroft Estates Ltd | Real estate | 2018 |
| Broadleaf Tree Surgeons Ltd | Other services | 2013 |
| Broadleigh Management Co. Limited | Households | 1977 |
| Broadrowe Provisions Limited | Professional & scientific | 2017 |
| Broadrowe Supplies LLP | | 2009 |
| Broke Hill Golf Club Limited | Arts & recreation | 1991 |
| Bromley & Orpington Accountancy Services Ltd | Professional & scientific | 2008 |
| Bromley Accountants,Bookkeeping & Payroll Services Ltd | Professional & scientific | 2014 |
| Bromley Brides Limited | Wholesale & retail | 2013 |
| Bromley Business Centre (Holdings) Ltd. | Administrative & support | 1960 |
| Bromley Colour Limited | Real estate | 1978 |
| Bromley Foods Ltd | Wholesale & retail | 2026 |
| Bromley Healthcare Care at Home Limited | Health & social care | 2020 |
| Bromley Healthcare Community Interest Company | Health & social care | 2009 |
| Bromley House Clearance Ltd | Transport & logistics | 2026 |
| Bromley North Construction Ltd | Construction | 2013 |
| Bromley Scaffolding Ltd | Construction | 2020 |
| Bromley Training Services Limited | Administrative & support | 2025 |
| Bromley Tree & Garden Care Ltd | Agriculture & fishing | 2021 |
| Bromley Valley Gymnastic Centre | Arts & recreation | 1991 |
| Bromsham Trading Limited | Manufacturing | 2005 |
| Brother Concrete Linepump Limited | Construction | 2018 |
| Brothers Bakery Wholesale Limited | Wholesale & retail | 2025 |
| Brothers Center Ltd | Transport & logistics | 2019 |
| Broucrew Studio Ltd | Professional & scientific | 2022 |
| Brow & Beauty Limited | Other services | 2013 |
| Brown Eagle 24 Ltd | Transport & logistics | 2024 |
| Brows by SAM Ltd | Other services | 2024 |
| Brush Buzz Limited | Construction | 2025 |
| BRW Electrical Ltd | Construction | 2017 |
| Brydian Smart Cards Limited | Manufacturing | 2018 |
| Bryen & Langley (Holdings) Ltd | Financial services | 2017 |
| Bryen & Langley Construction Limited | Construction | 2022 |
| Bryen & Langley Limited | Construction | 1998 |
| Bryen & Langley Trustee Limited | Financial services | 2025 |
| BS Bromley Ltd | Construction | 2016 |
| Bsafe Cycling Ltd | Wholesale & retail | 2015 |
| Bsql Ltd | Information & communication | 2018 |
| Bsure G.A.S Heating & Plumbing Ltd | | 2010 |
| BSW Construction Ltd | Construction | 2017 |
| BTR Building Limited | Construction | 2023 |
| BTR Building Services Limited | Construction | 2006 |
| BTR Estates Limited | Real estate | 2024 |
| Bttf Consultancy Limited | Information & communication | 2015 |
| Bubbassauces Limited | Professional & scientific | 2013 |
| Bubblegum Consulting Limited | Information & communication | 2017 |
| Bubblegum Finance Limited | Professional & scientific | 2018 |
| Bubbly Nursery for Children With Special Needs Ltd | Administrative & support | 2016 |
| Bucharest International Arbitration Center Ltd | Education | 2024 |
| Buckingham Estate Management Limited | Real estate | 2011 |
| Buckland Fitting Services Ltd | Construction | 2016 |
| Bucks Boilers Kent Limited | Wholesale & retail | 2025 |
| Buckston Browne Management Limited | Households | 2012 |
| Bugden Enterprises Ltd | Construction | 2026 |
| Bugzilla Consultancy Services Limited | Information & communication | 2022 |
| Build Works Design & Build Ltd | Construction | 2025 |
| Building for Living Ltd | Real estate | 2017 |
| Bulldozer Developer Limited | Financial services | 2020 |
| Bulldozer Media Limited | Manufacturing | 2002 |
| Bullnet Ltd | Information & communication | 2025 |
| Bulls Head Pratts Bottom Limited | Hospitality | 2019 |