| Brookson (5435A) Limited | Professional & scientific | 2007 |
| Brookson (5538I) Limited | Administrative & support | 2007 |
| Brookson (5562F) Limited | Administrative & support | 2007 |
| Brookson (5706K) Limited | Professional & scientific | 2007 |
| Brookson (5748J) Limited | Administrative & support | 2007 |
| Brookson (5980I) Limited | Administrative & support | 2007 |
| Broomfield Place Hale Limited | Real estate | 2024 |
| Broomleigh Property Management Company Limited | Households | 1992 |
| Broomwood Pharmacy Limited | Wholesale & retail | 1959 |
| Broussa Day Nursery Limited | Education | 2015 |
| Brow Joinery Limited | Construction | 2001 |
| Browne Estates Limited | Real estate | 2019 |
| Browne Estates PM Limited | Real estate | 2023 |
| Brownhill Homes Limited | Real estate | 2025 |
| Browsable Limited | Information & communication | 2011 |
| BRS Investment Limited | Real estate | 2008 |
| Bruce Neary Limited | Health & social care | 2018 |
| Brumbrums Limited | Extraterritorial | 2001 |
| Brunel Court (Northwich) Limited | Real estate | 2015 |
| Brunnian Solutions Limited | Professional & scientific | 2022 |
| Brushes Clough Reservoir Ltd | Extraterritorial | 2014 |
| Bruver Limited | Administrative & support | 2009 |
| Bryan Robson Limited | Arts & recreation | 1981 |
| Bryanton Geoserve Limited | Administrative & support | 2015 |
| Bryn Eithin Management Limited | Households | 1995 |
| Brynleys Catering Limited | Hospitality | 2002 |
| BS Kitchen Limited | Hospitality | 2019 |
| BSL Accountancy Services Limited | Professional & scientific | 2010 |
| Bspf Nominee Limited | Professional & scientific | 2017 |
| Bsquare Controls Limited | Administrative & support | 2015 |
| BSS LED [R&D] Limited | Manufacturing | 2010 |
| BT Photographic Ltd | Professional & scientific | 2011 |
| BTA Technology Ltd | Information & communication | 2023 |
| Btdauk CIC | Education | 2024 |
| Btma CIC | Education | 2024 |
| Buchananvets Ltd | Professional & scientific | 2008 |
| Bucklesham Freight Limited | Transport & logistics | 2019 |
| Buckley-Ross Holdings Ltd | Financial services | 2025 |
| Buckley-Ross Limited | Professional & scientific | 2009 |
| Budenberg 4B Group Limited | Manufacturing | 1996 |
| Budenberg 4B Trustees Limited | Extraterritorial | 1996 |
| Budenberg Gauge Company Limited | Manufacturing | 1902 |
| Budenberg Instrumentation Limited | Manufacturing | 2010 |
| Budenberg VAC Limited | Extraterritorial | 1996 |
| Build Manage Grow Ltd | Real estate | 2025 |
| Build the Block Ltd | Professional & scientific | 2020 |
| Buildflex Contractors Limited | Construction | 2021 |
| Buildfolio Private Limited | Real estate | 2023 |
| Building Automation Solutions Limited | Construction | 2006 |
| Bullet Point Ltd | Information & communication | 2014 |
| Bunch Capital Ltd. | Information & communication | 2023 |
| Bunch of Investors Ltd | Financial services | 2024 |
| Bunting Property Services Limited | Construction | 2025 |
| Burdett Properties Limited | Real estate | 2015 |
| Burford Lane PTY Limited | Real estate | 2025 |
| Burford Trust Limited(The) | Real estate | 1940 |
| Burford Trust Management Ltd. | Real estate | 1995 |
| Burgers on Top Ltd | Hospitality | 2026 |
| Burgess House Ltd | Households | 2014 |
| Burnham Lodge Flats Management (1986) Limited | Households | 1987 |
| Burr ST NOM1 Limited | Professional & scientific | 2020 |
| Burr ST NOM2 Limited | Professional & scientific | 2020 |
| Burrows Graham (Holdings) Limited | Financial services | 2022 |
| Burrows Graham Limited | Professional & scientific | 2020 |
| Burton Legal Services Ltd | Other services | 2021 |
| Burton Properties (Altrincham) LLP | | 2013 |
| Burton Road Clinic Ltd | Health & social care | 2013 |
| Burton Varley Ltd | Financial services | 2014 |
| Burton's Trading Ltd | Wholesale & retail | 2025 |
| Bury & District Property Company Limited | Real estate | 1963 |
| Businabox Ltd | Information & communication | 2023 |
| Business Accelerator Consulting Group Ltd | Real estate | 2019 |
| Business Analysis Consulting Services Limited | Professional & scientific | 2021 |
| Business Helpline & Advisory Limited | Professional & scientific | 2025 |
| Business Innovative Solutions Limited | Professional & scientific | 2025 |
| Business Intelligence Atlas Limited | Administrative & support | 2023 |
| Business Performance Consulting Limited | Professional & scientific | 2013 |
| Business Rocket Limited | Professional & scientific | 2016 |
| Business Sherpa Ltd | Professional & scientific | 2018 |
| Business Support Experts Limited | Administrative & support | 2022 |
| Business Transformation Solutions Limited | Professional & scientific | 2024 |
| Business Wisdom Limited | Information & communication | 2010 |
| Busy Little BEE Ltd | Administrative & support | 2020 |
| Bute House (Whalley Range) Management Company Limited | Households | 2007 |
| Butterfield Technology Ltd | Information & communication | 2010 |
| Butterfly Nominee Co Ltd | Extraterritorial | 2021 |
| Butts Green (Kingswood) Management Company Limited | Households | 2003 |
| Buy to LET Club Limited | Extraterritorial | 2014 |
| Buy UR Ticket Ltd | Information & communication | 2018 |
| Buzlen Limited | Manufacturing | 2019 |
| Buzz Property Solutions Ltd | Construction | 2022 |
| Buzzin' Leisure Ltd | Arts & recreation | 2021 |
| Buzzing Ltd | Information & communication | 2018 |
| Buzzmart Ltd | Wholesale & retail | 2025 |
| Bvyi Limited | Construction | 2023 |
| BW Carpentry & Maintenance Services Limited | Construction | 2014 |
| BW77 Solutions Limited | Administrative & support | 2016 |
| BWD Holdings Limited | Real estate | 2016 |
| BY DH Limited | Professional & scientific | 2022 |
| BY Invitation Only Limited | Professional & scientific | 2018 |