| Bramar Ltd | Administrative & support | 2016 |
| Bramfield House Holdings Limited | Financial services | 2017 |
| Bramfield House Limited | Construction | 1969 |
| Bramley & Birtley Management Company Ltd | Households | 2002 |
| Brand Design Solutions Limited | Wholesale & retail | 2019 |
| Branded Concept Security Limited | Administrative & support | 1998 |
| Brandium, Inc. Ltd. | Administrative & support | 2016 |
| Brandline Consulting Limited | Wholesale & retail | 2025 |
| Brandons Estate Agency Limited | Real estate | 2006 |
| Bravington Estate Ltd | Households | 2022 |
| Brax Group Ltd | Information & communication | 2023 |
| Brazil Tropical Ltd | Wholesale & retail | 2023 |
| Breache House Limited | Financial services | 2014 |
| Bread & Pudin' Ltd | Hospitality | 2026 |
| Break Box Vending Ltd | Wholesale & retail | 2025 |
| Breeze Maintenance Services Ltd | Construction | 2024 |
| Brenchley Close Management Company Limited | Households | 2015 |
| Brentmoor Heath Consulting Ltd | Professional & scientific | 2025 |
| Brian Stokes Coaching Ltd | Arts & recreation | 2024 |
| Brice Consulting Ltd | Professional & scientific | 2025 |
| Brick Build (Surrey) Ltd | Construction | 2025 |
| Bridger Window Cleaning Limited | Administrative & support | 2018 |
| Bridgeview Accountancy Ltd | Professional & scientific | 2025 |
| Bridley Consulting Limited | Professional & scientific | 2003 |
| Bridley Manor Farm Limited | Real estate | 2025 |
| Brie Limited | Information & communication | 2013 |
| Bright Child (Hornsey) Ltd | Education | 2012 |
| Bright Vision Investment Ltd | Real estate | 2022 |
| Brightlights Solutions Surrey Limited | Construction | 2021 |
| Brightown Property Management Limited | Households | 1999 |
| Brightsites Ltd | Information & communication | 2023 |
| Brightstar Networks Limited | Information & communication | 2011 |
| Brimington Developments NO. 1 Limited | Real estate | 2018 |
| Brimington Developments NO. 2 Limited | Real estate | 2018 |
| Brimona OEV Ltd | Transport & logistics | 2019 |
| Briones & Briones Ltd | Professional & scientific | 2011 |
| Briss Technologies Limited | Administrative & support | 2018 |
| Brit Horizon Ltd | Wholesale & retail | 2026 |
| Brit Survival Co. Ltd | Wholesale & retail | 2025 |
| Britaniamark Limited | Other services | 2023 |
| Britannia Gold Limited | Professional & scientific | 2021 |
| British Industrial Gases Limited | Extraterritorial | 1955 |
| Britten Management Limited | Real estate | 2013 |
| Britten Properties ST Albans Limited | Real estate | 2016 |
| Britten Properties ST Albans Residential Limited | Real estate | 2017 |
| Brivana Limited | Hospitality | 2026 |
| Broadcast Focus Limited | Information & communication | 2022 |
| Broadgate Consultancy Limited | Wholesale & retail | 2000 |
| Broadoaks Contracts Ltd | Construction | 2025 |
| Broadsphere Ltd | Transport & logistics | 2025 |
| Broadstone Ecosystems Ltd | Professional & scientific | 2013 |
| Broadstone Estate Management Ltd | Households | 2010 |
| Broadwater Conservation Society | Other services | 2018 |
| Brock Heath Limited | Real estate | 2025 |
| Brodean Limited | Administrative & support | 2008 |
| Brody & Brooke London Limited | Wholesale & retail | 2022 |
| Bromley Court Residents Association Limited | Households | 1968 |
| Bromley Grove Residents Limited | Households | 1994 |
| Brompton Gardens Management Limited | Households | 2019 |
| Brook Farm Management Company Limited | Households | 2025 |
| Brook Leisure (Surrey) Limited | Wholesale & retail | 2001 |
| Brooklyn Road Management Company Limited | Households | 2001 |
| Brookshore Limited | Administrative & support | 2015 |
| Brookside Pre-School Ltd | Health & social care | 2013 |
| Brookwood Bakeries Limited | Manufacturing | 1999 |
| Brookwood Cars & Taxis Limited | Transport & logistics | 2009 |
| Brookwood Club (Assets) Limited | Other services | 2018 |
| Brookwood Club Limited | Other services | 2018 |
| Brookwood Commercial Selection Limited | Administrative & support | 2005 |
| Brookwood Restaurant Limited | Hospitality | 2024 |
| Brookwood Search & Selection Ltd | Administrative & support | 2002 |
| Brookwood Selection Ltd | Administrative & support | 2016 |
| Brookwood Solutions Ltd | Administrative & support | 2012 |
| Brookwood Temporary Solutions Ltd | Administrative & support | 2008 |
| Broomhouse Management Limited | Households | 2020 |
| Brophy Properties Ltd | Real estate | 2023 |
| Brother Homes Limited | Real estate | 2026 |
| Brother Transport Services Limited | Transport & logistics | 2026 |
| Browman Logistics Limited | Transport & logistics | 2025 |
| Brown Pumpkin Ltd | Professional & scientific | 2026 |
| Brown Wilder Ltd | Professional & scientific | 2009 |
| Browns Group Holdings (London) Limited | Construction | 2020 |
| Browns Group Properties Limited | Real estate | 2024 |
| Broyd Investments Ltd | Financial services | 2020 |
| Brriyah Ltd | Wholesale & retail | 2022 |
| Bruckshaw Brands Ltd | Wholesale & retail | 2023 |
| Bryan NZ Limited | Information & communication | 2015 |
| Bryn S Elliott Consulting Ltd | Construction | 2024 |
| BS Consultancy Services Ltd | Professional & scientific | 2024 |
| Btvision Impex Limited | Wholesale & retail | 2025 |
| Buckingham Gate Investments Limited | Real estate | 2014 |
| Buff UP Limited | Information & communication | 2018 |
| Buglear Bate & Co Limited | Professional & scientific | 2023 |
| Build UP Sales Systems Ltd | Professional & scientific | 2022 |
| Builder Sky Ltd | Construction | 2015 |
| Builders Update Solutions Ltd | Construction | 2024 |
| Building Balance Services Limited | Professional & scientific | 2023 |
| Building Testing Limited | Professional & scientific | 1999 |
| Buildology UK (Surrey) Limited | Construction | 2026 |
| Buildvize Ltd | Construction | 2021 |