| Box to Box Media Limited | Manufacturing | 2008 |
| Boxed Bills Ltd. | Energy | 2026 |
| Boxpipe Limited | Hospitality | 2003 |
| Boyapati Trading Limited | Real estate | 2015 |
| Bpdmr Enterprises Limited | Hospitality | 2017 |
| BPT (Full Reversions) Limited | Extraterritorial | 2001 |
| BPT Bridgewater (Home Reversions) Limited | Real estate | 1997 |
| Bradley Sales & Lettings Ltd | Real estate | 2026 |
| Braidnglow Ltd | Other services | 2021 |
| Brain Aaasset Ltd | Health & social care | 2011 |
| Brainwave Brands Ltd | Manufacturing | 2013 |
| Bramber Estates Limited | Real estate | 2026 |
| Brand & Reputation Management Ltd | Professional & scientific | 2017 |
| Brandtech Computing Limited | Information & communication | 2021 |
| Brantome Property Limited | Real estate | 2023 |
| Breadpoint Ltd | Manufacturing | 2008 |
| Brecken Court Residents Association Limited | Households | 1999 |
| Brewery Stables Management Limited | Households | 2000 |
| Brexumo Ltd | Wholesale & retail | 2025 |
| Brian Jones Maintenance Services Ltd | Professional & scientific | 2019 |
| Brick Services Limited | Wholesale & retail | 1999 |
| Brick-Tech Limited | Construction | 1997 |
| Brickroot Holdings Limited | Real estate | 2026 |
| Bricks and Mortar NE Ltd | Real estate | 2023 |
| Brickyard Bakery Community Interest Company | Hospitality | 2015 |
| BRIDGE2BRIGHTER Ltd | Education | 2025 |
| Bridgeham Limited | Real estate | 2018 |
| Bridgemediauk Ltd | Professional & scientific | 2025 |
| Bridgepark Leisure Limited | Hospitality | 2026 |
| Bridgestreet Ltd | Real estate | 2017 |
| Bridgewater (Home Reversions Number 1) Limited | Real estate | 2002 |
| Bridgewater (Home Reversions Number 2) Limited | Real estate | 2001 |
| Bridgewater Contractual Tenancies Limited | Real estate | 2004 |
| Bridgewater Equity Release Limited | Real estate | 2004 |
| Bridgewater Equity Release Nominees (NO 1) Limited | Professional & scientific | 2005 |
| Bridgewater Equity Release Nominees (NO 2) Limited | Professional & scientific | 2005 |
| Bridgewater Lifetime Mortgages Limited | Real estate | 2004 |
| Bridgewater Property Holdings Limited | Real estate | 2004 |
| Bridgewater Tenancies Limited | Real estate | 2003 |
| Bridgewater Tenancies Nominees Limited | Professional & scientific | 2003 |
| Brigham Property Co Ltd | Real estate | 2020 |
| Bright Housing Limited Ltd | Construction | 2026 |
| Brighter Horizons Psychotherapy Ltd | Education | 2023 |
| Brighter World Productions Ltd | Information & communication | 2007 |
| Brightroot NE Limited | Construction | 2025 |
| Brightsight Medical Ltd | Health & social care | 2025 |
| Brightwave Retail Ltd | Wholesale & retail | 2026 |
| Brims & Co Limited | Professional & scientific | 2006 |
| Brims Building Group Limited | Construction | 2011 |
| Brims Civil Engineering Limited | Extraterritorial | 2011 |
| Brims Construction Limited | Construction | 1996 |
| Brims Homes Limited | Extraterritorial | 2011 |
| Brims Maintenance Limited | Extraterritorial | 2011 |
| Brinkburn House (Dunston Riverside) Management NO 2 Limited | Households | 2002 |
| Bristol Street (NO.1) Limited | Extraterritorial | 1997 |
| Bristol Street (NO.2) Limited | Extraterritorial | 1959 |
| Bristol Street Commercials (Italia) Limited | Extraterritorial | 2007 |
| Bristol Street Fifth Investments Limited | Extraterritorial | 1995 |
| Bristol Street Fleet Services Limited | Extraterritorial | 1974 |
| Bristol Street Group Limited | Extraterritorial | 1996 |
| Bristol Street Limited | Extraterritorial | 1924 |
| Brizzolari Limited | Hospitality | 2020 |
| BRL Lets Ltd | Real estate | 2020 |
| Broad Street Consulting Limited | Administrative & support | 2023 |
| Brocha Estates Ltd | Real estate | 2019 |
| Brochvr Limited | Information & communication | 2019 |
| Brockcrest Group Limited | Financial services | 1988 |
| Brongate Limited | Health & social care | 1981 |
| Bronze Boutique Tanning Salon Limited | Other services | 2024 |
| Brooke Bentham Ltd | Information & communication | 2025 |
| Brooks Offshore Services Limited | Professional & scientific | 2024 |
| Brookside (1998) Limited | Extraterritorial | 2001 |
| Brotherhood Fitness Ltd | Health & social care | 2022 |
| Broughton House (Dunston Riverside) Management Limited | Households | 2002 |
| Brow WOW Bar Ltd | Other services | 2019 |
| BRP Investments Ltd | Real estate | 2019 |
| Bruce Express Limited | Transport & logistics | 1989 |
| Brucegate Holdings Ltd | Financial services | 2024 |
| Brunton Car Wash Ltd | Administrative & support | 2023 |
| Bruntsfield Estates Ltd | Real estate | 2016 |
| Bruton Dental Management Ltd | Health & social care | 2024 |
| Brys Software Ltd | Information & communication | 2014 |
| Bryte Digital and Screen Limited | Manufacturing | 2013 |
| BS Randhawa Property Limited | Real estate | 2018 |
| BSB Cargo Ltd | Transport & logistics | 2020 |
| BSC Electricals NE Limited | Construction | 2025 |
| BSC Financial Services Ltd | Financial services | 2017 |
| BSD (UK) Ltd | Manufacturing | 2002 |
| BSD Finance Ltd | Financial services | 2019 |
| BSD Investmentsuk Ltd | Real estate | 2017 |
| BSD Properties NE Ltd | Real estate | 2024 |
| BSD Roofing Limited | Construction | 2010 |
| BSD Rydal Investments Limited | Real estate | 2024 |
| BSD Wallsend Ltd | Real estate | 2017 |
| Bsdprop Limited | Real estate | 2014 |
| BSH Pension Trustee Limited | Extraterritorial | 1997 |
| BTG Cosmetics Limited | Wholesale & retail | 2026 |
| BTG Spa Limited | Other services | 2026 |
| BUA Commercial Limited | Real estate | 2023 |
| BUA Commercial NO 2 Limited | Real estate | 2023 |