| Basil Property Limited | Administrative & support | 2007 |
| Basil Ridha Neurology Limited | Health & social care | 2025 |
| Basilica Limited | Real estate | 1988 |
| Basilico Bistro Ltd | Hospitality | 2026 |
| Baskrooms Ltd | Hospitality | 2025 |
| Bass Couture Ltd | Arts & recreation | 2014 |
| Bass Couture Records Limited | Information & communication | 2017 |
| Basskonnection Ltd | Arts & recreation | 2024 |
| Bassline Rigging Limited | Administrative & support | 2025 |
| Batdog Projects Ltd | Professional & scientific | 2016 |
| Bate & Albon Limited | Professional & scientific | 2014 |
| Batemans Road Limited | Real estate | 2019 |
| Bater General Contracting UK Limited | Construction | 2021 |
| Bath Bags Ltd | Manufacturing | 2025 |
| Batoneee Limited | Wholesale & retail | 2026 |
| Bator App Limited | Information & communication | 2019 |
| Bavian Design Limited | Professional & scientific | 2017 |
| Bavian Developments Ltd | Real estate | 2025 |
| Baws Enterprises Ltd | Administrative & support | 2025 |
| Baxter Interior Design Ltd | Construction | 2019 |
| Baxter Street LLP | | 2012 |
| Bay Properties Sussex Ltd | Real estate | 2020 |
| BAY12 Studio Ltd | Other services | 2013 |
| Bayagan Group Ltd | Wholesale & retail | 2016 |
| Bayagan Holdings Limited | Financial services | 2022 |
| Bayleaf Seafront Ltd | Hospitality | 2019 |
| Bayrak Ltd | Hospitality | 2019 |
| Baywood Design Limited | Manufacturing | 2025 |
| Baztech Solutions Limited | Information & communication | 2007 |
| BB All-Star Ltd | Wholesale & retail | 2023 |
| BB Electrical Services Ltd | Construction | 2017 |
| BB Film Limited | Information & communication | 2016 |
| BB Heat Pumps Ltd | Construction | 2012 |
| BB Oral Health Limited | Health & social care | 2011 |
| BBB Senang Ltd | Manufacturing | 2016 |
| BBE Health Limited | Health & social care | 2020 |
| BBR Solutions Limited | Information & communication | 2000 |
| BC Beauty Ltd | Other services | 2022 |
| BC Beauty Training Limited | Other services | 2013 |
| Bc&L RTM Company Limited | Households | 2025 |
| BC2 Limited | Professional & scientific | 2015 |
| BCD Auto Limited | Wholesale & retail | 2023 |
| Bconn Ltd | Information & communication | 2026 |
| BCR So-Lar Ltd | Energy | 2022 |
| BCS Group Holdings Limited | Financial services | 2011 |
| BCS Robertson Ltd | Construction | 2018 |
| BCS Supplies Ltd | Wholesale & retail | 1994 |
| BD Investments Limited | Administrative & support | 1996 |
| Bdrn Consultants Ltd | Professional & scientific | 2024 |
| BDS (Sussex) Limited | Construction | 2017 |
| BE BE Business Services Limited | Administrative & support | 2016 |
| BE Content Ltd | Professional & scientific | 2013 |
| BE Data Solutions Limited | Information & communication | 2021 |
| BE Electric Media Ltd | Information & communication | 2015 |
| BE Metis Limited | Information & communication | 2024 |
| BE Property Solution Ltd | Real estate | 2026 |
| BE the FOX Limited | Information & communication | 2013 |
| BE Work Fit Ltd | Arts & recreation | 2025 |
| BEA (Sussex) Limited | Real estate | 2010 |
| Beach Boutique Property Management Limited | Real estate | 2021 |
| Beach Box Limited | Arts & recreation | 2013 |
| Beach Box Spa Ltd | Health & social care | 2018 |
| Beach Cafe Brighton Limited | Hospitality | 2017 |
| Beach Green Valeting Ltd | Administrative & support | 2026 |
| Beach Tennis UK Limited | Arts & recreation | 2012 |
| Beachfront Leisure Ltd | Hospitality | 2014 |
| Beachside Consulting Ltd. | Information & communication | 2016 |
| Beacon 105 Limited | Professional & scientific | 2002 |
| Beacon Hill Management Company Limited | Households | 2006 |
| Beacon Medical Communications Ltd | Professional & scientific | 2014 |
| Beaconsfield Villas SPV 1 Limited | Construction | 2025 |
| Beaconsville Court (Brighton) Limited | Real estate | 1961 |
| Beakman Studios Limited | Information & communication | 2025 |
| Beal's Farm Limited | Manufacturing | 2022 |
| Beamwood Limited | Administrative & support | 2022 |
| Beanbag Limited | Real estate | 2018 |
| Beancount Limited | Professional & scientific | 2011 |
| Beanstalk Psychology Ltd | Health & social care | 2023 |
| Bear Paula Ltd | Hospitality | 2018 |
| Bear Road LLP | | 2012 |
| Bear Town Ltd | Arts & recreation | 2019 |
| Bearded Excavation Ltd | Information & communication | 2023 |
| Bearded PUB Co Limited | Hospitality | 2018 |
| Beardsley Property Management Ltd | Real estate | 2016 |
| Bearly Awake Ltd | Hospitality | 2025 |
| Bears Construction Ltd | Construction | 2021 |
| Bears in Suits Ltd | Professional & scientific | 2023 |
| Bearwood Properties Ltd | Real estate | 2014 |
| Beat About the Bush Limited | Administrative & support | 1996 |
| Beat Goes on Limited | Arts & recreation | 2016 |
| Beatnik Breaks Limited | Hospitality | 2012 |
| Beatrice Isaac Consultancy Ltd | Health & social care | 2020 |
| Beats and Treats Limited | Information & communication | 2019 |
| Beau and Bell Tent Hire Limited | Administrative & support | 2018 |
| Beau and Bell Tipi Hire Limited | Administrative & support | 2023 |
| Beau Gems Limited | Wholesale & retail | 1981 |
| Beau-Quay UK Ltd | Wholesale & retail | 2024 |
| Beaufort Norwood Ltd | Real estate | 2021 |
| Beaulieu Contracts Ltd | Construction | 2014 |
| Beaumont Holdco Ltd | Health & social care | 2021 |