| Blue FOX Group Limited | Professional & scientific | 2020 |
| Blue FOX Properties Limited | Real estate | 2016 |
| Blue Plateau Limited | Real estate | 2003 |
| Blue Works Sussex Limited | Real estate | 2016 |
| BN7BS1 Limited | Professional & scientific | 2019 |
| Boba BAO Ltd | Hospitality | 2022 |
| Bobinet LLP | | 2023 |
| Boddington IT Consulting Ltd | Information & communication | 2023 |
| Bodimeade Andrew Ltd | Arts & recreation | 2003 |
| Bodywise Muscle Care Limited | Wholesale & retail | 2007 |
| Boldstar Properties Limited | Real estate | 1999 |
| Boltlight Ltd | Education | 2019 |
| BON Bride Limited | Wholesale & retail | 2019 |
| Bonner-Murray Consulting Ltd | Professional & scientific | 2024 |
| Bonzini UK Ltd | Wholesale & retail | 2025 |
| Borracasa Limited | Real estate | 2015 |
| Bothy Design Studio Ltd | Professional & scientific | 2026 |
| Botolph Alley RTM Company Limited | Households | 2014 |
| Bounce Hire Ltd | Arts & recreation | 2017 |
| Bound Rates, Inc. | | 2025 |
| BOW Windows Bookshop Limited | Administrative & support | 2010 |
| Box Buddies Ltd | Manufacturing | 2016 |
| Brampton Business Park Ventures Limited | Extraterritorial | 2010 |
| Brave Girl Vain Girl Ltd | Wholesale & retail | 2023 |
| Brayford Limited | Manufacturing | 1985 |
| Brayo Ltd | Wholesale & retail | 2026 |
| Brickells Farmhouse Limited | Real estate | 2025 |
| Brickells Land 1 Limited | Real estate | 2025 |
| Brickells Land 2 Limited | Real estate | 2025 |
| Brickfast NO.2 Limited | Professional & scientific | 2010 |
| Bright Blue Motors Limited | Wholesale & retail | 2020 |
| Brighter Days Residential Ltd | Health & social care | 2025 |
| Brighthelmstone Limited | Wholesale & retail | 1998 |
| Brightnight Limited | Other services | 2008 |
| Brighton Toxicology Services Ltd | Professional & scientific | 2023 |
| Brighton Wellness and Beauty Ltd | Other services | 2022 |
| Brighton West Pier Trading Limited | Wholesale & retail | 2000 |
| Brighton West Pier Trust(The) | Arts & recreation | 1978 |
| Brighton, Hove & District Mencap Society | Health & social care | 1998 |
| Brightwater Conveyancing Ltd | Professional & scientific | 2026 |
| Brit TV Limited | Information & communication | 1997 |
| Brithop Brewing Company Limited | Manufacturing | 2017 |
| Brockwells Forestry Limited | Agriculture & fishing | 1996 |
| Broomans Court Residents Association (Lewes) Limited | Households | 1999 |
| Brown & Gray Ltd | Professional & scientific | 2016 |
| Brown’S (Sussex) Ltd | Administrative & support | 2020 |
| Brunswick Developments Group Limited | Real estate | 1994 |
| Brunswick Homes Limited | Real estate | 2020 |
| Brunswick Homes London Limited | Construction | 2023 |
| Build Red Limited | Construction | 2015 |
| Buildequip Construction Rentals Ltd | Administrative & support | 2025 |
| Buildsure Limited | Construction | 2020 |
| Bumdry UK Ltd | Wholesale & retail | 2026 |
| Bunbunbun Limited | Hospitality | 2024 |
| Bureau NEU Limited | Professional & scientific | 2019 |
| Burley (South) Developments Limited | Professional & scientific | 2004 |
| Burrito Cartel Limited | Hospitality | 2017 |
| Bvssh Group Limited | Financial services | 2025 |
| Bygone Steam Toys Ltd | Wholesale & retail | 2025 |
| Byron Close (Ringmer) Management Company Limited | Households | 2019 |
| C & N Structural Limited | Construction | 2010 |
| C L Murphy Limited | Arts & recreation | 2015 |
| C S Concrete Holdings Limited | Financial services | 2023 |
| C&J Farrow Ltd. | Information & communication | 2014 |
| C. Beamish Limited | Real estate | 1958 |
| C.B Rail Ltd | Wholesale & retail | 2022 |
| C.E.B.Rail Ltd | Manufacturing | 2013 |
| C.M. Wettern Limited | Extraterritorial | 1960 |
| CAB Workshop LLP | | 2018 |
| Caburn Advisers LLP | | 2007 |
| Caburn Decorating Ltd | Construction | 1999 |
| Caburn Electrical Services Limited | Construction | 2021 |
| Caccia and Tails UK Limited | Hospitality | 2017 |
| Cad@Fionaryan.Works Ltd | Information & communication | 2019 |
| Cafe Vegu Limited | Hospitality | 2021 |
| Calabbria Limited | Hospitality | 2021 |
| Call IT! Workplace Culture App CIC | Information & communication | 2021 |
| Calligram Design & Content Ltd | Professional & scientific | 2016 |
| Calm Fire Ltd | Wholesale & retail | 2020 |
| Camilla Perkins Limited | Arts & recreation | 2018 |
| Camondo London Limited | Other services | 2025 |
| Campbell Facilitation Ltd | Professional & scientific | 2010 |
| Camper and Marine Ltd | Construction | 2016 |
| Canning Ericsson Limited | Construction | 1988 |
| Canterbury Quantum Limited | Professional & scientific | 2023 |
| Cara Tonkin Ltd | Manufacturing | 2025 |
| Care for Community Living Limited | Health & social care | 1996 |
| Cargon E-Velo Ltd | Wholesale & retail | 2024 |
| Carnesky Productions Limited | Administrative & support | 2009 |
| Carol Attfield Limited | Administrative & support | 2003 |
| Carpenter Farrer Limited | Professional & scientific | 2008 |
| Carpenters Croft Management Company Limited | Households | 1989 |
| Carriage Mews (Ripe) Management Company Limited | Households | 2018 |
| Carthage Music Limited | Information & communication | 2002 |
| Castle Lewes Ltd | Hospitality | 2026 |
| Castle Masters Ltd | Arts & recreation | 2023 |
| Cat and Frog Limited | Professional & scientific | 2016 |
| Catandra Limited | Professional & scientific | 2015 |
| Catering Productions Limited | Extraterritorial | 2014 |
| Cautley House Management Company Limited | Households | 2025 |