| Botch Sconnet Ltd | Manufacturing | 2020 |
| Bottrills Transport Limited | Transport & logistics | 1968 |
| Boulderlink Ltd | Professional & scientific | 2022 |
| Boultbee Flight Academy Ltd | Education | 2011 |
| Boulton Property Management Ltd | Real estate | 2025 |
| Bounce Bounce Baby Ltd | Administrative & support | 2026 |
| Boutique Beach Ltd | Hospitality | 2020 |
| Boveno Services Ltd | Administrative & support | 2017 |
| Boxall Homes Ltd | Real estate | 2020 |
| Boxclever Media Ltd | Information & communication | 2015 |
| Boxgrove Estates Limited | Real estate | 2012 |
| Boxgrove Village Stores & Cafe Ltd | Wholesale & retail | 2019 |
| Boyall Properties Ltd | Real estate | 2019 |
| BP Civils Consulting Ltd | Professional & scientific | 2026 |
| Bpcoaching Limited | Education | 2021 |
| BPF Solar Limited | Energy | 2022 |
| BR Aviation Limited | Arts & recreation | 2009 |
| BR Property Management Limited | Households | 2021 |
| Bracklesham Board Riders Ltd | Wholesale & retail | 2006 |
| Bracklesham Caravan & Boat Club Limited | Hospitality | 1964 |
| Bracklesham Court Limited | Real estate | 2016 |
| Bracklesham Garage Limited | Wholesale & retail | 2005 |
| Bradley Designs (Sussex) Ltd | Professional & scientific | 2019 |
| Bradley Stoves Sussex Limited | Construction | 2007 |
| Bramley & Sage Limited | Wholesale & retail | 2024 |
| Brampton Road Trade Park Management Company Limited | Construction | 2006 |
| Bran Holdings Ltd | Financial services | 2019 |
| Branch OUT Plants Ltd | Wholesale & retail | 2025 |
| Brandwave Marketing Limited | Professional & scientific | 2006 |
| Brave Percy Motor Co Ltd | Professional & scientific | 2021 |
| Breakaway Investment Group Ltd | Professional & scientific | 2025 |
| Breedr Impact Limited | Administrative & support | 2020 |
| Breeze Blinds Ltd | Administrative & support | 2004 |
| Bremere Lane Management Company Limited | Households | 2003 |
| Brendon Cook 2 Ltd | Other services | 2017 |
| Brenlaw Limited | Wholesale & retail | 2003 |
| Brennan Marketing Services Ltd | Construction | 1997 |
| Brewed Burgers Limited | Hospitality | 2024 |
| Brewer Cowls Limited | Extraterritorial | 2007 |
| Brewer Manufacturing Limited | Financial services | 2018 |
| Brewer Metalcraft Limited | Manufacturing | 1994 |
| Brian Langmead Limited | Other services | 1960 |
| Briant Investments Limited | Financial services | 2016 |
| Brick Borrow Limited | Arts & recreation | 2023 |
| Brick Kiln Garden Centre Limited | Wholesale & retail | 2015 |
| Brick Manor Limited | Financial services | 2021 |
| Bridge Bedding Centre Limited | Wholesale & retail | 2016 |
| Bridge Carpentry One Ltd | Construction | 2016 |
| Bridge Court (Runcton) Management Company Limited | Households | 2002 |
| Bridge Road Developments(Hampton Court) Ltd | Real estate | 2013 |
| Bridgewater Care Ltd | Health & social care | 2015 |
| Bridle Business Park Limited | Real estate | 2010 |
| Bright Alternative Ltd | Education | 2016 |
| Bright Function Limited | Information & communication | 2014 |
| Bright Green Car Recycling Limited | Wholesale & retail | 2020 |
| Bright Inclusive Ltd. | Professional & scientific | 2025 |
| Bright Plan Civils Ltd | Professional & scientific | 2019 |
| Bright Plan Ltd | Professional & scientific | 2018 |
| Bright Starts Day Nursery Ltd | Education | 2013 |
| Brightride CIC | Administrative & support | 2021 |
| Brightserve Limited | Information & communication | 2007 |
| Brightwhale Ltd | Administrative & support | 2025 |
| Brigittex Ltd | Wholesale & retail | 2025 |
| Brilliant Beer Company Limited | Education | 2000 |
| Brimstone Labs Ltd | Information & communication | 2025 |
| Brisk Property Management LLP | | 2025 |
| Brisk Systems Management Limited | Construction | 2005 |
| Britannia Law Limited | Administrative & support | 2018 |
| British Ballet Organization Limited | Education | 1978 |
| Brittain Marketing Services Limited | Other services | 1998 |
| Broadbridge Farms Limited | Agriculture & fishing | 1970 |
| Broadbridge Limited | Construction | 2018 |
| Broadbridge Mill "B" Company Limited | Households | 1998 |
| Broadbridge Mill Number One Management Limited | Households | 1990 |
| Broader Perspective Ltd | Other services | 2021 |
| Broadham Property Limited | Real estate | 2016 |
| Broadmark Consulting Limited | Information & communication | 2013 |
| Broadreach Landscapes Limited | Administrative & support | 2010 |
| Brockway Interiors Ltd | Construction | 2013 |
| Brodule SM Parts Limited | Other services | 2017 |
| Bromfelde Estates Ltd | Financial services | 2023 |
| Brook Independent Estate Agents Limited | Real estate | 2003 |
| Brook Independent Holdings Limited | Financial services | 2025 |
| Brook Independent Residential Lettings Limited | Households | 2002 |
| Brook Meadows (Hambrook) Management Limited | Households | 2015 |
| Brooke Carter Ltd | Real estate | 2022 |
| Brookes-Harmer Estates Limited | Real estate | 2014 |
| Brooks Vines Gardens Ltd | Administrative & support | 2025 |
| Brookview Landscapes & Garden Services Ltd | Other services | 2019 |
| Brookview Nursery Walberton Ltd | Other services | 2025 |
| Broomer Farm Developments (Birdham) Limited | Construction | 2025 |
| Broomer Farm Holdings Limited | Financial services | 2023 |
| Broomer Farm Investments Limited | Construction | 1986 |
| Broomer Farm Trading Limited | Other services | 1971 |
| Brothers’, Bikes, Bangers & Brews Community Interest Company | Wholesale & retail | 2025 |
| Brownley Properties Ltd | Real estate | 2021 |
| Brownseabuild (Coolhurst) 2021 Limited | Construction | 2021 |
| Brownseabuild 2 Limited | Construction | 2016 |
| Brownseabuild 3 Limited | Construction | 2017 |
| Brownseabuild 4 Limited | Construction | 2017 |