| Breckland Aero Ltd | Transport & logistics | 2022 |
| Breckland Balloons Ltd. | Arts & recreation | 1999 |
| Breckland Crematorium Ltd | Other services | 2017 |
| Breckland House Management Company Limited | Households | 2003 |
| Breckland Water Treatment Limited | Administrative & support | 2019 |
| Brenda Collison Close Management Limited | Professional & scientific | 2002 |
| Bridge Close (Lenwade) Limited | Households | 2021 |
| Bridge Close Management Company Limited | Households | 2016 |
| Bridgegate Homes Limited | Construction | 2018 |
| Bridgehead Investments Ltd | Construction | 2006 |
| Bridgit Knowles Limited | Real estate | 2015 |
| Bright Blast Ltd | Professional & scientific | 2017 |
| Brinkman Pro Limited | Administrative & support | 2014 |
| Britannia Groundwork's Norfolk Ltd | Construction | 2026 |
| Britton & Hills Limited | Real estate | 2012 |
| Brix Cafe Ltd | Hospitality | 2025 |
| Broads Premier Ltd | Arts & recreation | 2018 |
| Broadwalks (King's Lynn) Management Company Limited | Real estate | 1986 |
| Brocade Court RTM Company Limited | Real estate | 2015 |
| Brock Fire, Safety and Access Control Ltd | Other services | 2024 |
| Brook House Cattery Ltd | Other services | 2026 |
| Brothers in Arms Restaurant Limited | Hospitality | 2025 |
| Brown's Tree Management Limited | Other services | 2015 |
| BROWN77 Limited | Professional & scientific | 2004 |
| Bruch & Co. Limited | Professional & scientific | 2002 |
| Brunch & Lunch Limited | Hospitality | 2026 |
| Brundle Consulting Ltd | Professional & scientific | 2018 |
| Bruno and Rita Limited | Health & social care | 2013 |
| Brunswick Automotive Limited | Arts & recreation | 2002 |
| Bruso Elite Studio Ltd | Arts & recreation | 2018 |
| Bryan Freeman Mortgage Services Ltd | Financial services | 2021 |
| BS Rentals Ltd | Real estate | 2026 |
| BSA Products Limited | Manufacturing | 2012 |
| Bspk Furniture Company Ltd | Manufacturing | 2026 |
| BTB & Sons (Builders) Ltd | Construction | 2009 |
| BTB and Co Construction Ltd | Real estate | 2024 |
| BTK (Norfolk) Ltd | Manufacturing | 2026 |
| BTR Plumbing and Heating Ltd | Construction | 2020 |
| Bubba Shrimp Limited | Agriculture & fishing | 2013 |
| Buckingham Court (Hunstanton) Management Limited | Households | 1977 |
| Bucur Construction Limited | Construction | 2025 |
| Budd Holdings Limited | Financial services | 2022 |
| Budget Blueprint Ltd | Education | 2024 |
| Buffery and SON Limited | Real estate | 1970 |
| Build IT From Scratch Limited | Construction | 2020 |
| Building & Energy Assessments Ltd | Professional & scientific | 2023 |
| Built Environment Collective Limited | Professional & scientific | 2018 |
| Bullas Properties Ltd | Real estate | 2003 |
| Bulrush Construction Limited | Construction | 2023 |
| Burba Traders Ltd | Construction | 2026 |
| Burdess Holdings Limited | Professional & scientific | 2010 |
| Burgh Street (Management) Limited | Extraterritorial | 1988 |
| Burlington Court (Sheringham) Management Company Ltd | Households | 2023 |
| Burnham Market Developments Limited | Construction | 2022 |
| Burnham Market Limited | Construction | 2023 |
| Burnham Market Meadows Limited | Households | 2024 |
| Burnham Market Rentals Limited | Real estate | 2026 |
| Burnham Thorpe Residents Limited | Households | 2016 |
| Burns Court Management Company Limited | Households | 1989 |
| Burrico Limited | Health & social care | 2004 |
| Burridge & Pluck Solicitors Ltd | Professional & scientific | 2023 |
| Burton Environmental Consulting Limited | Professional & scientific | 2007 |
| Burton Richards Limited | Manufacturing | 2006 |
| Burtons Investment Corporation Limited | Administrative & support | 2018 |
| BUS Station Cafe (KL) Limited | Hospitality | 2017 |
| Business Growth Services Limited | Professional & scientific | 2000 |
| Business Process Excellence Consultancy Limited | Administrative & support | 2017 |
| Business Support Direct Limited | Professional & scientific | 2009 |
| Busy Workers Experts Ltd | Construction | 2023 |
| Butlers 1960 Limited | Extraterritorial | 2014 |
| Button Engineering Limited | Manufacturing | 2011 |
| Buy the Mind Limited | Financial services | 2012 |
| Buzra Investments Ltd | Real estate | 2012 |
| Buzra Property Management Ltd | Households | 2022 |
| Buzzy BEE Bookkeeping Services Ltd | Professional & scientific | 2023 |
| Bygen (Chippenham) Ltd | Energy | 2023 |
| Bygen Power (Tregeen) Limited | Energy | 2016 |
| Bygen Power Limited | Energy | 2007 |
| Bywater Property Solutions Limited | Manufacturing | 2025 |
| C & a Superbikes (King's Lynn) Ltd | Wholesale & retail | 2006 |
| C & C Mobile Caravan Services and Sales Ltd | Manufacturing | 2025 |
| C & D Motors Ltd | Wholesale & retail | 2006 |
| C & M Servicing Limited | Construction | 1998 |
| C & S J Taylor Limited | Agriculture & fishing | 2017 |
| C & T Electronics Ltd | Wholesale & retail | 2022 |
| C B RAO Anaesthetics Services Ltd | Health & social care | 2016 |
| C K E Entertainment Limited | Hospitality | 2019 |
| C Nine Aesthetics Limited | Other services | 2025 |
| C P Cooper Plumbing & Heating Ltd | Construction | 2013 |
| C&C Property Maintenance Ltd | Construction | 2024 |
| C&G Refrigeration Limited | Professional & scientific | 2002 |
| C&L Newsagents Limited | Wholesale & retail | 2016 |
| C&P Nails Spa (PE) Limited | Other services | 2023 |
| C-Fix Limited | Manufacturing | 2015 |
| C. J. M. Electrical Specialists Ltd | Construction | 2012 |
| C. J. M. Renewable Specialists Ltd | Construction | 2023 |
| C. N. a. Distribution Limited | Extraterritorial | 2009 |
| C.A.Lewis | Agriculture & fishing | 1957 |
| C.A.P. Symonds Ltd | Other services | 2022 |
| C.T.S. Security Limited | Construction | 1986 |