| Black Dog Renovations Ltd | Construction | 2021 |
| Black Duck Investments Ltd | Real estate | 2024 |
| Black Oak Construction (Southern) Ltd | Construction | 2026 |
| Black Olive Limited | Hospitality | 2026 |
| Blackburn Trailers Limited | Manufacturing | 1998 |
| Blackfield Consultants Ltd | Professional & scientific | 2020 |
| Blackflamingostore Ltd | Wholesale & retail | 2021 |
| Blackriverdetails Limited | Wholesale & retail | 2016 |
| Blackwall Investments Limited | Construction | 1989 |
| Blakehurst Barns Management Limited | Households | 2020 |
| Blakeney & Bond Ltd | Wholesale & retail | 2013 |
| Blakkk Limited | Extraterritorial | 2016 |
| Blanc Legal Limited | Professional & scientific | 2025 |
| Blanchard Consultants Limited | Professional & scientific | 2016 |
| Blanchard Properties (Southern) Limited | Real estate | 2017 |
| Blandford Advisory Limited | Professional & scientific | 2021 |
| BLC Electrical Ltd | Construction | 2022 |
| Blessed Yoga Limited | Education | 2019 |
| Blink Design (UK) Limited | Wholesale & retail | 2012 |
| Block Chain Inc Ltd | Transport & logistics | 2023 |
| Block Party UK Ltd | Professional & scientific | 2024 |
| Bloodyit Limited | Professional & scientific | 2017 |
| Bloom Bird Digital Ltd | Administrative & support | 2022 |
| Bloom Pilates Ltd | Education | 2022 |
| Blossoming Births Ltd | Education | 2022 |
| Blossoms Brighton Ltd | Hospitality | 2022 |
| Bloxo Limited | Manufacturing | 2023 |
| BLU Skies Ltd | Transport & logistics | 2013 |
| Blue 134 Ltd | Wholesale & retail | 2002 |
| Blue Bathrooms Ltd | Construction | 2023 |
| Blue Dock Limited | Administrative & support | 2026 |
| Blue Flag Technologies Limited | Information & communication | 1991 |
| Blue House Project Limited | Financial services | 2020 |
| Blue Marine UK Limited | Wholesale & retail | 2018 |
| Blue Monde Ltd | Financial services | 2011 |
| Blue Pecan Computer Training Limited | Information & communication | 2012 |
| Blue Ribbon Plants Ltd | Agriculture & fishing | 2021 |
| Blue Rocket Holdings Limited | Wholesale & retail | 2018 |
| Blue Sky Hosts Limited | Information & communication | 2012 |
| Blue Spire Financial Planning Limited | Financial services | 2009 |
| Blue Spire Limited | Professional & scientific | 2015 |
| Blue Streak Limited | Professional & scientific | 2025 |
| Blue Waters Residents Association Ltd. | Households | 2007 |
| Blueprint Design Company Limited(The) | Arts & recreation | 1985 |
| Blueprint Network Limited | Extraterritorial | 2006 |
| Bluesky (Oxford) Limited | Professional & scientific | 2006 |
| Blumin Limited | Administrative & support | 2007 |
| Blyth Livestock Advisor Services Limited | Agriculture & fishing | 2018 |
| Blyth Model Dairies Limited | Agriculture & fishing | 1963 |
| BM Greenhouses Ltd | Construction | 2025 |
| BMB Training Solutions Ltd | Education | 2014 |
| BMC Tiling Limited | Construction | 2016 |
| BMD 2025 Limited | Administrative & support | 2025 |
| BMS Energy Management Ltd | Construction | 2001 |
| Boatingbuddy Marine Services Limited | Manufacturing | 2019 |
| Boatyard Hastings Ltd | Hospitality | 2019 |
| Bodybag Active Ltd | Wholesale & retail | 2021 |
| Bodymaster Method Limited | Extraterritorial | 2013 |
| BOE Capital Ltd | Real estate | 2025 |
| Bognor Apartments Ltd | Real estate | 2025 |
| Bognor Hair Advice Ltd | Other services | 2012 |
| Bognor Investment Co.Limited | Real estate | 1954 |
| Bognor Regis & District MCC Limited | Arts & recreation | 2005 |
| Bognor Regis Dental Limited | Health & social care | 2012 |
| Bognor Regis Motor Club Limited | Arts & recreation | 2000 |
| Bognor Regis Scaffolding Ltd | Construction | 2014 |
| Bognor Road Developments Limited | Construction | 2011 |
| Bognor Websites Ltd | Professional & scientific | 2025 |
| Bolar Groundworks Ltd | Construction | 2024 |
| BON Bois Limited | Arts & recreation | 2023 |
| Bond-A-Frame Limited | Wholesale & retail | 1996 |
| Bone a Limited | Wholesale & retail | 2020 |
| Bonesmend Ltd | Wholesale & retail | 2021 |
| Bonhams Field Management Company Limited | Households | 2022 |
| Bonnier Media Ltd | Information & communication | 2004 |
| Bonsai Tiger Ltd | Information & communication | 2015 |
| Boocock Advisory Ltd | Professional & scientific | 2021 |
| Bookfolly Limited | Wholesale & retail | 2024 |
| Booth Concrete Specialists Ltd | Construction | 2023 |
| Booth PIG Equipment Ltd | Professional & scientific | 2013 |
| Booths Consultants Ltd | Information & communication | 2025 |
| Bootworks Theatre Community Interest Company | Arts & recreation | 2009 |
| Borch WIX Energy Advisors Limited | Mining & quarrying | 2020 |
| Border Digital Ltd | Administrative & support | 2007 |
| Border Fine Art (West Sussex) Ltd | Arts & recreation | 2024 |
| Bore Vale Limited | Real estate | 2009 |
| Boreas Retail Consulting LLP | | 2024 |
| Borland & Borland (Lettings) Limited | Real estate | 2001 |
| Borland and Borland LLP | | 2009 |
| Born Thinking Ltd | Information & communication | 2007 |
| Borthwick Property Management Ltd | Households | 2020 |
| Bosh Comp Limited | Arts & recreation | 2026 |
| Bosham Dental Laboratory Limited | Health & social care | 2005 |
| Bosham GAS Ltd | Construction | 2020 |
| Bosham Holdings Limited | Health & social care | 2025 |
| Bosham Homes Ltd | Construction | 2015 |
| Bosham Landscapes Limited | Administrative & support | 2016 |
| Bosham Sailing Club Limited | Arts & recreation | 1992 |
| Bosham Takeaway Ltd | Hospitality | 2019 |
| Bosham Tutors Ltd | Education | 2025 |