| BEN Davis Marketing Ltd | Other services | 2021 |
| BEN Hillman Limited | Construction | 2015 |
| BEN Lucas Ltd | Professional & scientific | 2020 |
| Benbow Limited | Professional & scientific | 1997 |
| Benjamin Forward Limited | Health & social care | 2023 |
| Benji's Exterior Property Care Ltd | Administrative & support | 2022 |
| Bens Gutter Cleaning Exeter Ltd | Administrative & support | 2026 |
| Bentley's Accounting Ltd | Professional & scientific | 2000 |
| Bentleys Accountants Ltd | Professional & scientific | 2012 |
| Bentswood Hub C.I.C. | Hospitality | 2023 |
| Bergot Unlimited Ltd | Other services | 2025 |
| Bespoke Agronomy Limited | Agriculture & fishing | 2021 |
| Bespoke Divorce and Finance Limited | Professional & scientific | 2026 |
| Better at Home Care Ltd | Health & social care | 2024 |
| Bevpack Ltd | Wholesale & retail | 2012 |
| Bevtech - Trading Ltd | Wholesale & retail | 2020 |
| Beyond Cloudnine Limited | Professional & scientific | 2025 |
| Beyond Trauma Ltd | Other services | 2025 |
| BGC Investments Limited | Real estate | 2020 |
| Bghe Limited | Arts & recreation | 2011 |
| Bgma Trading Limited | Wholesale & retail | 2021 |
| BH Gaming Ltd. | Information & communication | 2022 |
| Bhspando Ltd | Wholesale & retail | 2024 |
| Bife Sussex Limited | Hospitality | 2024 |
| Big Bite Sound Ltd | Information & communication | 2022 |
| Big Cheese Investments Limited | Construction | 2016 |
| Big MAN Removals Ltd | Transport & logistics | 2018 |
| Bikri Limited | Professional & scientific | 2018 |
| Billiecaufield Ltd | Professional & scientific | 2023 |
| Billingshurst Community Partnership Limited | Other services | 2005 |
| Binary Lighting Limited | Wholesale & retail | 2012 |
| BIO Cosmetics Limited | Wholesale & retail | 2006 |
| BIO Secure Borders LLP | | 2023 |
| Bio-Mechs Ltd | Administrative & support | 2019 |
| Biocosmedical Ltd | Administrative & support | 2020 |
| Bionics Corporation Ltd | Wholesale & retail | 1996 |
| Bios Rural Limited | Agriculture & fishing | 2025 |
| Biotelligent Ltd | Information & communication | 2012 |
| Biotida Ltd | Professional & scientific | 2023 |
| Birch & Company (Haywards Heath) Limited | | 1982 |
| Birchen Lane Residents Management Company Limited | Households | 2024 |
| Birchgrove Healthcare (Sussex) Limited | Health & social care | 2007 |
| Bird & Newman Automotive Limited | Wholesale & retail | 2026 |
| Birdswan Solutions Limited | Other services | 1995 |
| BIS Bros Ltd | Real estate | 2024 |
| Bizdolphin Ltd | Information & communication | 2022 |
| Bizezia Limited | Administrative & support | 2000 |
| Bizgen Solutions Ltd | Wholesale & retail | 2025 |
| Bkheward Co Limited | Hospitality | 2025 |
| Black Opal Investments Limited | Wholesale & retail | 2025 |
| Black Silver Property Limited | Real estate | 2014 |
| Black Swan Creation Limited | Construction | 2024 |
| Blackman Terry Accountants Ltd | Professional & scientific | 2020 |
| Blackman Terry LLP | | 2010 |
| Blackthorn and Brook Ltd | Health & social care | 2022 |
| Blackwater Consolidated Services Ltd | Professional & scientific | 2026 |
| Blanc Collections Ltd | Wholesale & retail | 2017 |
| Blandford Dental Workshop Ltd | Professional & scientific | 2014 |
| Block 2 ST Francis Park (Haywards Heath) Management Company Limited | Real estate | 2011 |
| Blockleys Brick Limited | Professional & scientific | 2010 |
| Blooming Futures Limited | Construction | 2016 |
| Blooming Marvellous Gardens Ltd | Administrative & support | 2017 |
| Blossom and Roar Limited | Wholesale & retail | 2017 |
| Blossom Travel Ltd. | Administrative & support | 2019 |
| Bltc Trading Ltd | Wholesale & retail | 2018 |
| Bltp Limited | Real estate | 2000 |
| Blue Elephant Bookkeeping Ltd | Professional & scientific | 2023 |
| Blue Leisure Management Limited | Arts & recreation | 2010 |
| Blue Pixel Design Limited | Other services | 2006 |
| Blue Roots Limited | Other services | 2020 |
| Bluebell Services Limited | Professional & scientific | 2017 |
| Blueberryit Limited | Information & communication | 2012 |
| Bluefix Energy Solutions Ltd | Construction | 2022 |
| Bluelight Direct Limited | Wholesale & retail | 2004 |
| Bluntswood Limited | Professional & scientific | 2015 |
| BM Basement Specialist Ltd | Construction | 2025 |
| BM Promanage Ltd | Construction | 2024 |
| Bmbd Limited | Construction | 2023 |
| Bmhn Ventures Limited | Professional & scientific | 2026 |
| Bmores RD Limited | Wholesale & retail | 2025 |
| BNR22 Ltd | Hospitality | 2022 |
| Bobo Bacchus Limited | Real estate | 2014 |
| Boddy Matthews Limited | Professional & scientific | 2012 |
| Body Mechanics International Limited | Health & social care | 2023 |
| Body Rocket Ltd | Manufacturing | 2018 |
| Bodywerks Limited | Wholesale & retail | 2023 |
| Boha Print Ltd | Manufacturing | 2019 |
| Bold & Belt Ltd | Manufacturing | 2025 |
| Bolero Ventures Ltd | Transport & logistics | 2021 |
| Bolney Brewing Collective Limited | Professional & scientific | 2025 |
| Bolney Wine Estate Ltd | Manufacturing | 2003 |
| Bolnore Farm Lane Residents Association Limited | Households | 2010 |
| Bolnore Financial Planning Limited | Financial services | 2023 |
| Bolnore Heating Services Limited | Construction | 2018 |
| Bolnore Services Ltd | Hospitality | 2016 |
| Bolnore Village Events Community Interest Company | Administrative & support | 2025 |
| Bolnore Village Homes Ltd | Extraterritorial | 2010 |
| Bonafidee Limited | Information & communication | 2008 |
| Bonaventure (Real Estate) Limited | Professional & scientific | 2020 |
| Bonaventure Finance Limited | Financial services | 2014 |