| Azure Apartments Limited | Households | 2024 |
| Azure Wave Ltd | Financial services | 2025 |
| Azzura Medical Limited | Health & social care | 2024 |
| B & B Kids Cuts Ltd | Other services | 2011 |
| B & H Carpark and Storage Limited | Transport & logistics | 2025 |
| B & H Contract Cleaning Ltd | Administrative & support | 2025 |
| B & H Motors (Brighton) Ltd | Wholesale & retail | 2022 |
| B & J Domestic Appliances Ltd | Other services | 2003 |
| B & L (Sussex) Limited | Health & social care | 2014 |
| B @ 1 ORG Limited | Financial services | 2008 |
| B a Education Services Ltd | Arts & recreation | 2024 |
| B Ahmed Letting (Sussex) Limited | Real estate | 2018 |
| B at NO One Ltd | Wholesale & retail | 2024 |
| B Byrne Builders Limited | Construction | 2014 |
| B C Quay Commercial Limited | Real estate | 2021 |
| B Howard Plumbing & Heating Ltd | Construction | 2024 |
| B Jandu Ltd | Real estate | 2018 |
| B M Welsh Engineering Limited | Professional & scientific | 2018 |
| B N K Limited | Real estate | 2025 |
| B R Siggins (Maidstone) Ltd | Real estate | 2013 |
| B Right on Living Ltd | Real estate | 2016 |
| B Sharpe PHG Limited | Construction | 2026 |
| B Star Fitness Ltd | Wholesale & retail | 2017 |
| B Sussed Ltd | Professional & scientific | 2021 |
| B&H Business Solutions Ltd | Administrative & support | 2021 |
| B&K Wine Store Limited | Wholesale & retail | 2021 |
| B&N Trading Limited | Wholesale & retail | 2021 |
| B&R Jewellers Ltd | Wholesale & retail | 2023 |
| B&R Murphy Investment Ltd | Financial services | 2025 |
| B&S Medical Limited | Health & social care | 2012 |
| B'Neen Ltd | Hospitality | 2024 |
| B. R. T. Productions CIC | Arts & recreation | 2014 |
| B.A. Education London Ltd | Arts & recreation | 2025 |
| B.A.D. Biscuit Productions Ltd | Arts & recreation | 2023 |
| B.Flow Limited | Construction | 2025 |
| B.G.Milner & Sons Limited | Information & communication | 2014 |
| B.T. Estates Management Limited | Real estate | 1990 |
| B1M Services Ltd | Information & communication | 2017 |
| Baabah Ltd | Manufacturing | 2026 |
| Babacan Kitchen Limited | Real estate | 2020 |
| Babble Beach Limited | Hospitality | 2024 |
| Babushka Creative Limited | Information & communication | 2014 |
| Baby BAO Limited | Hospitality | 2017 |
| Babyfoot Ltd | Wholesale & retail | 2001 |
| BAC2 Ltd | Professional & scientific | 2001 |
| Bacelli Diamond Ltd | Wholesale & retail | 2026 |
| Back Pocket Creative Ltd | Information & communication | 2023 |
| BACK2BACK Productions Limited | Information & communication | 2003 |
| Backbone Studio Ltd | Manufacturing | 2023 |
| Backstreet Company Ltd | Wholesale & retail | 2023 |
| Backwood Circus Limited | Hospitality | 2019 |
| Backwood Trafalgar Limited | Hospitality | 2019 |
| Backwood Ventures Limited | Hospitality | 2019 |
| BAD Crackers Limited | Wholesale & retail | 2024 |
| BAD Cuckoo Limited | Administrative & support | 2014 |
| BAD Tooth Studios Limited | Information & communication | 2026 |
| Badger Consultancy Limited | Real estate | 1988 |
| Badger Trust | Other services | 2005 |
| Badgerhammer Limited | Information & communication | 2018 |
| Badgers Tennis Club Ltd | Arts & recreation | 2013 |
| Badhan & Badhan Portfolio Limited | Real estate | 2018 |
| Badu Ltd | Other services | 2013 |
| BAG of Holding Limited | Financial services | 2026 |
| Bagabaldo Healthcare Solutions Ltd | Health & social care | 2021 |
| Bagel and Coffee Limited | Hospitality | 2020 |
| Bagel Palace Ltd | Manufacturing | 2017 |
| Baggott Consulting Limited | Information & communication | 2013 |
| Bahari Limited | Real estate | 1973 |
| Bahmaps Limited | Information & communication | 2017 |
| Bahtag CIC | Other services | 2020 |
| Bailes Place Management Limited | Households | 2012 |
| Bailey & French Ltd | Administrative & support | 2014 |
| Bainbridge Carpentry & Construction Ltd | Construction | 2022 |
| Bainbridge Estate Management Ltd | Administrative & support | 2016 |
| Baines& Ltd | Manufacturing | 2014 |
| Bake a Difference Sussex CIC | Hospitality | 2022 |
| Baked Hove Ltd | Hospitality | 2025 |
| Bakehouse Music Ltd | Arts & recreation | 2015 |
| Baker Street Bikes Limited | Wholesale & retail | 2000 |
| Bakers & Burns Limited | Hospitality | 2014 |
| Balance Engineers Ltd | Professional & scientific | 2024 |
| Balanced Coaching Ltd | Health & social care | 2023 |
| Balancepointe Ltd | Education | 2012 |
| Balanus Equities Limited | Other services | 2013 |
| Baldchefnick Limited | Hospitality | 2023 |
| Baldocks of Wivelsfield Limited | Wholesale & retail | 1977 |
| Baldwin Builders Ltd | Construction | 2020 |
| Balearic Investments Ltd | Real estate | 2022 |
| Balfour Booty Limited | Real estate | 2023 |
| Balfour Brick Limited | Real estate | 2026 |
| Balfour Investment Property Limited | Real estate | 2017 |
| Balfour Swimming School Ltd | Arts & recreation | 2026 |
| Ball and Duck Studios Ltd | Professional & scientific | 2015 |
| Balmonds Skincare Ltd | Wholesale & retail | 2018 |
| Balmoral Promotions Limited | Construction | 2022 |
| Balmoral RTM Company Limited | Extraterritorial | 2025 |
| Balthamos Ltd | Hospitality | 2018 |
| Balti Express 1 Ltd | Hospitality | 2024 |
| Bambo Landscaping and Gardening Ltd | Administrative & support | 2021 |
| Bamboo Nine Co Ltd | Real estate | 2022 |