| BF Mechanical Services Ltd | Wholesale & retail | 2026 |
| Bfbrands Ltd | Wholesale & retail | 2022 |
| Big Forest Cosmetics Ltd | Wholesale & retail | 2021 |
| Big Red Brick Dog Limited | Hospitality | 2024 |
| Bijou Apartments Ltd | Real estate | 2024 |
| Billings Holdings Limited | Financial services | 2025 |
| Bionet Property Services Ltd | Administrative & support | 2015 |
| Birchwood Communications Ltd | Professional & scientific | 2022 |
| BIS Grocery Limited | Wholesale & retail | 2025 |
| BL Coomber Services Ltd | Information & communication | 2025 |
| Black Consulting Services Limited | Information & communication | 2015 |
| Blackbox Automations Ltd | Information & communication | 2025 |
| Blakewater Contracting Ltd | Information & communication | 2015 |
| Bloc Systems Ltd | Wholesale & retail | 1989 |
| Blue Mangos Cafe & Bar Ltd | Administrative & support | 2022 |
| Blueberry Housing Limited | Administrative & support | 2008 |
| Bluebird Investments Limited | Real estate | 1997 |
| Bluemont Group Ltd | Financial services | 2026 |
| Bluemont Holdings Ltd | Real estate | 2020 |
| Bluemont Labs Ltd | Information & communication | 2026 |
| Blurton Commercial Property LLP | | 2021 |
| Blyde Automation Ltd | Information & communication | 2025 |
| Blythe Hill Limited | Households | 2024 |
| BNG Investments Ltd | Real estate | 2021 |
| Boiler Spares Distribution Limited | Wholesale & retail | 2002 |
| Bolingbroke General Trading Co Ltd | Wholesale & retail | 2013 |
| Bookbindesigns Ltd | Manufacturing | 2021 |
| Boon Homes & Rentals Limited | Real estate | 2016 |
| Bosham Marketing Limited | Other services | 1980 |
| Botley HUS Limited | Real estate | 2022 |
| Boutique Professional Media Ltd | Information & communication | 2018 |
| Bowe Property Ltd | Real estate | 2023 |
| Boxcrack Digital Ltd | Information & communication | 2023 |
| Bramber Aircraft Services Ltd | Manufacturing | 2008 |
| Brian Dodd & Company Ltd | Real estate | 1998 |
| Briant Broadband Ltd | Information & communication | 2020 |
| Brick and Beam Investments Ltd | Real estate | 2025 |
| Bricksteel Ltd | Real estate | 2016 |
| Bright Spark Ventures Ltd | Construction | 2011 |
| Bright White International Limited | Wholesale & retail | 2016 |
| Brighten Fundraising Ltd | Administrative & support | 2022 |
| Brighton Bytes Ltd | Information & communication | 2020 |
| Brighton Cardiothoracic Surgery Ltd | Health & social care | 2020 |
| Brighton City Electrical Limited | Construction | 2016 |
| Brighton Roofing Specialists Ltd | Construction | 2025 |
| Brighton Scaffold Alarms Ltd | Construction | 2015 |
| Brighton Seaside Cleaning Limited | Administrative & support | 2026 |
| Brittain Group Ltd | Information & communication | 2023 |
| Broadwater Sports & Embroidery Ltd | Wholesale & retail | 2015 |
| Broadway Academy of Counselling and Psychotherapy Training Ltd | Education | 2023 |
| Bronze Pauls Ltd | Other services | 2025 |
| Brooklands Confectionery Limited | Wholesale & retail | 2023 |
| Brooklands Park Financial Services Limited | Administrative & support | 2006 |
| BRP International Ltd | Professional & scientific | 2023 |
| BRP1 Ltd | Financial services | 2025 |
| BRP2 Ltd | Real estate | 2025 |
| Bruks Cafe Ltd | Hospitality | 2025 |
| Brunt Financial Planning Ltd | Financial services | 2019 |
| BSB Architectural Services Limited | Professional & scientific | 2021 |
| Buckingham Park Financial Services Limited | Professional & scientific | 2021 |
| Buckle UP Ltd | Information & communication | 2021 |
| Buckley Property Solutions Ltd | Construction | 2023 |
| Buffalo Machines Limited | Wholesale & retail | 2023 |
| Build Sussex Ltd | Construction | 2024 |
| Burgess-Autos Ltd | Wholesale & retail | 2024 |
| Bury Manor Barn Ltd | Hospitality | 2021 |
| Business Inception Limited | Extraterritorial | 2023 |
| Businesstyle Limited | Real estate | 2006 |
| BYE BYE Baby Limited | Information & communication | 2025 |
| Byrpark Limited | Real estate | 2002 |
| Bytecode Labs Ltd | Financial services | 2021 |
| C&N Carpets and Flooring Ltd | Wholesale & retail | 2026 |
| C-Able 2024 Limited | Professional & scientific | 2024 |
| C. a. Build Limited | Information & communication | 2012 |
| C. F. Autos Limited | Wholesale & retail | 2012 |
| C.H Roofing Limited | Construction | 2024 |
| C.M.H. Limited | Wholesale & retail | 1986 |
| Cadbury Properties Limited | Real estate | 2023 |
| Cadbury Ventures Limited | Financial services | 2023 |
| Caisteal Properties Ltd | Real estate | 2024 |
| Caley Brothers Limited | Agriculture & fishing | 2020 |
| Cali K9 Ltd | Other services | 2025 |
| Calla Style Designs Ltd | Professional & scientific | 2018 |
| Camdesign Limited | Professional & scientific | 2007 |
| Camping World Limited | Extraterritorial | 1998 |
| Capital Securities & Investments Ltd | Real estate | 2004 |
| Carandy Limited | Construction | 2012 |
| Carelink Direct Ltd | Health & social care | 2016 |
| Carergemhealth Ltd | Administrative & support | 2025 |
| Carewise Properties Ltd | Real estate | 2022 |
| Carivo UK Ltd | Wholesale & retail | 2025 |
| Carlana Ltd | Administrative & support | 2017 |
| Carlton Leach Ltd | Information & communication | 2021 |
| Carpentour Ltd | Arts & recreation | 2017 |
| Carrasel Ltd | Hospitality | 2019 |
| Catalyst Applications Ltd | Information & communication | 2020 |
| Cattblack Ltd | Wholesale & retail | 2020 |
| Cavalry Driveways and Landscaping Ltd | Construction | 2022 |
| CBG Construction Group Ltd | Construction | 2020 |
| CBG Construction Ltd | Construction | 2014 |