| BN Medical Writing Limited | Administrative & support | 2020 |
| BN Transport Services Limited | Transport & logistics | 2024 |
| BN1 Arts Centre CIC | Education | 2024 |
| BN1 Arts Limited | Education | 2023 |
| BN1 Carpentry Ltd | Manufacturing | 2017 |
| BN1 Direct Ltd | Wholesale & retail | 2026 |
| BN1 Electrical Limited | Construction | 2018 |
| BN1 Holdings Limited | Professional & scientific | 2026 |
| BN1 Ltd | Professional & scientific | 2019 |
| BN1 Motors Limited | Wholesale & retail | 2022 |
| BN1 Property Solutions Ltd | Construction | 2024 |
| BN1 Recruitment Limited | Professional & scientific | 2008 |
| BN1 Surveyors Ltd | Professional & scientific | 2021 |
| BN2 Styles Ltd | Other services | 2019 |
| BN3 Asset Management Limited | Financial services | 2017 |
| BN3 Law Limited | Professional & scientific | 2023 |
| BN3 Properties Ltd | Real estate | 2022 |
| Bnjc | Education | 2020 |
| Bnjc Trading Limited | Real estate | 2022 |
| BNM Auto Ltd | Wholesale & retail | 2024 |
| BNM Parkstone LLP | | 2008 |
| Boarder Control Ltd | Arts & recreation | 2025 |
| Boardwalk Limited | Hospitality | 1999 |
| Boatcare Sussex Ltd | Manufacturing | 2021 |
| Boatseed Ltd | Other services | 2017 |
| BOB Ahern Consulting Ltd | Information & communication | 2015 |
| BOB Wilson Consultancy Limited | Administrative & support | 2022 |
| Bob's Community Cafe Ltd | Hospitality | 2018 |
| Bob's Transport (Sussex) Ltd | Transport & logistics | 2020 |
| Bobble Ltd | Professional & scientific | 2004 |
| Bobby Holding Ltd | Hospitality | 2015 |
| Bobby Salazar Consulting Ltd | Professional & scientific | 2026 |
| Bocka Bocka Ltd | Wholesale & retail | 2016 |
| Bocolife Ltd | Real estate | 2020 |
| Bodhi’S Coffee Shop Limited | Hospitality | 2024 |
| Bodimed Ltd | Health & social care | 2024 |
| Body Essentials Online Ltd | Wholesale & retail | 2025 |
| Body Fixers Health & Wellness Limited | Other services | 2022 |
| Bofort Ltd | Financial services | 2009 |
| Boho Bazar Limited | Wholesale & retail | 2017 |
| Boho Boho Ltd | Wholesale & retail | 2023 |
| Boho Gelato Ltd | Manufacturing | 2010 |
| Boiler and Burner Services Limited | Construction | 2018 |
| Boiler Specialist KBC Ltd | Construction | 2024 |
| BOK Deliveries (Wallington) Ltd | Administrative & support | 2020 |
| Boldscript Ltd | Professional & scientific | 2013 |
| Bolingbroke Roofing Limited | Construction | 2008 |
| Bolingbroke Roofing Sussex Ltd | Construction | 2025 |
| Bolourchi Ltd | Construction | 2019 |
| BOM Flux Limited | Professional & scientific | 2026 |
| Bombshell Beauty Limited | Other services | 2024 |
| BON Insight Limited | Information & communication | 2024 |
| Bona Vada Limited | Arts & recreation | 2009 |
| Bonchurch Road Limited | Construction | 2020 |
| Bond Studios Ltd | Hospitality | 2015 |
| Bond Worth Holdings Limited | | 1896 |
| Bondzo Properties Limited | Financial services | 2026 |
| Bone & Carter Limited | Wholesale & retail | 2000 |
| Bongle Systems Ltd | Information & communication | 2022 |
| Boni Technology Ltd | Information & communication | 2018 |
| Bonne Etoile Marketing Ltd | Professional & scientific | 2026 |
| Bonni Outbuildings Ltd | Construction | 2018 |
| Bonpaul Limited | Professional & scientific | 2012 |
| Bonsai Plant Kitchen Ltd | Hospitality | 2026 |
| Bonus Populus Ltd | Administrative & support | 2022 |
| Boofel Enterprises Limited | Professional & scientific | 2010 |
| Book My Demos Limited | Professional & scientific | 2024 |
| Booked Rooms Ltd | Hospitality | 2014 |
| Boolaky Consultancy Ltd | Administrative & support | 2023 |
| Boom Bird Limited | Hospitality | 2020 |
| Boomerang Kids | Education | 2002 |
| Boominshot Ltd | Information & communication | 2005 |
| Boorman Parker Limited | Professional & scientific | 2026 |
| Booster Property Investment 2 Ltd | Real estate | 2019 |
| Bootle Design Limited | Arts & recreation | 2010 |
| Bootstrapped PR Limited | Professional & scientific | 2013 |
| Boozyclouds Ltd | Wholesale & retail | 2025 |
| Born Makers Limited | Manufacturing | 2017 |
| Born Ready Games Limited | Information & communication | 2012 |
| BORN2SWIMUK Ltd | Education | 2023 |
| Borowski Holdings Limited | Real estate | 1992 |
| Borrowed Earth Ltd | Professional & scientific | 2025 |
| Borrowed Time Films Ltd | Information & communication | 2012 |
| Boss Building & Carpentry Limited | Construction | 2023 |
| Boss Building Developments Limited | Construction | 2014 |
| Boss Carpet Cleaning Ltd | Administrative & support | 2026 |
| Boss PUB Ltd | Hospitality | 2022 |
| Bosunstone Limited | Construction | 1986 |
| Bothwells Accountants Limited | Professional & scientific | 2015 |
| Bott Block Ltd | Real estate | 2018 |
| Bott Property Services Limited | Real estate | 2016 |
| Bottled UP Ltd | Hospitality | 2019 |
| Boubi Limited | Hospitality | 2005 |
| Boudica Creations Limited | Arts & recreation | 2015 |
| Boulevard Florists Limited | Wholesale & retail | 1957 |
| Boulevard Marketing Ltd | Professional & scientific | 2019 |
| Bounce Back Foundation | Health & social care | 2011 |
| Bounce Back Project Limited | Health & social care | 2013 |
| Boundless Enterprises Limited | Other services | 2016 |
| Boundless Experiences Limited | Other services | 2016 |