| Body & Soul Boutique Spa Ltd | Other services | 2024 |
| Body-Torque Pilates Ltd | Health & social care | 2010 |
| Bohema Hair Ltd | Wholesale & retail | 2023 |
| Bohema Studio Ltd | Other services | 2025 |
| Boldu Ltd | Transport & logistics | 2023 |
| Bolney Urology Ltd | Administrative & support | 2008 |
| Bolton's Group Limited | Wholesale & retail | 2020 |
| Bombs Scents Ltd | Manufacturing | 2021 |
| Bond Fit OUT & Refurbishment Ltd | Construction | 2022 |
| Bondvale Homes (Westwood Stores) South Godstone Ltd | Construction | 2026 |
| Bondvale Limited | Construction | 2022 |
| Bonito Apps Limited | Information & communication | 2018 |
| Boodhun Limited | Other services | 2024 |
| Boom Boom Audio Limited | Information & communication | 2011 |
| Borderless Consulting Corporation Ltd | Information & communication | 2022 |
| Boris A/C Ltd | Professional & scientific | 2016 |
| Boroughworks CIC | Real estate | 2026 |
| Boss Dog Graphics Ltd | Wholesale & retail | 2022 |
| Botes Beheer BV Ltd | Other services | 2019 |
| Bougainvillea Limited | Wholesale & retail | 2019 |
| Bourne 2025 Ltd | Construction | 2025 |
| Bourne Electrical Contracting Limited | Construction | 2025 |
| Bourne Open Source Limited | Information & communication | 2005 |
| Bournes Haulage Ltd | Transport & logistics | 2019 |
| Bouverie Lodge Management Company Limited | Households | 1970 |
| Bowheart Property Limited | Real estate | 2020 |
| Box Joint Limited | Arts & recreation | 2014 |
| Bramblecroft Limited | Real estate | 2020 |
| Bramblewood Residents Association Limited | Real estate | 1992 |
| Brampton House Management Company Limited | Households | 1989 |
| Bray Music Limited | Wholesale & retail | 2015 |
| Brayne & Sons Ltd | Construction | 2026 |
| Brenman Properties Limited | Real estate | 1985 |
| Brewstarz Ltd | Information & communication | 2020 |
| Brian Gale & Associates Limited | Professional & scientific | 2018 |
| Brian Gale Holdings Limited | Financial services | 2021 |
| Bridge IT CRM Consulting Limited | Professional & scientific | 2020 |
| Bridge Works Development Limited | Real estate | 2001 |
| Bridgeforever Limited | Professional & scientific | 2009 |
| Bridome Limited | Construction | 1986 |
| Bright Spark 24/7 Ltd | Construction | 2025 |
| Brightbyrd Cleaners Ltd | Administrative & support | 2024 |
| Brightleigh Consulting Limited | Professional & scientific | 2011 |
| Brighton Fire and Security Ltd | Administrative & support | 2023 |
| Brightpad Construction Limited | Construction | 2022 |
| Bristow Technical Services Limited | Transport & logistics | 1953 |
| Bristow (UK) LLP | | 2008 |
| Bristow Aircraft Leasing II Ltd. | Administrative & support | 2019 |
| Bristow Aircraft Leasing Limited | Administrative & support | 2016 |
| Bristow Aviation Holdings Limited | Transport & logistics | 1996 |
| Bristow Helicopters (International) Limited | Transport & logistics | 1958 |
| Bristow Helicopters Limited | Transport & logistics | 1955 |
| Bristow Worldwide L.P. | | 2010 |
| Britaniacrest Developments Limited | Construction | 2016 |
| Britaniacrest Properties Ltd | Other services | 2017 |
| Britannia Mobile Self Storage Limited | Transport & logistics | 2006 |
| Britannia Movers International PLC | Transport & logistics | 1981 |
| Britannia Movers Limited | Transport & logistics | 2001 |
| Britannia Record Management Limited | Transport & logistics | 1999 |
| Britannia Self Storage Limited | Transport & logistics | 2000 |
| British and Foreign Wharf Company Limited(The) | Real estate | 1907 |
| British WAX (Holdings) Limited | Financial services | 2013 |
| British WAX Refining Company Limited(The) | Manufacturing | 1914 |
| Brixton Ventures Limited | Real estate | 2021 |
| Broadbridge Heath Mews Management Limited | Households | 1987 |
| Broadhythe Ltd | Hospitality | 2006 |
| Brooklands Way Limited | Real estate | 2021 |
| Brookview Developments and Construction Limited | Construction | 2020 |
| Brown Sugar Management Limited | Wholesale & retail | 2012 |
| Brownie Boyz Ltd | Wholesale & retail | 2023 |
| Browns Electrical & Solar Services Ltd | Construction | 2002 |
| BRS Project Management Limited | Administrative & support | 2013 |
| Bryan Ingleby Consulting Limited | Professional & scientific | 2014 |
| BSS Language Limited | Education | 2024 |
| Bubwa Initiatives Ltd | Hospitality | 2022 |
| Buffalo Soul JA Ltd | Hospitality | 2018 |
| Built by Cornerstone Extensions Ltd | Construction | 2023 |
| Built by Cornerstone Property Maintenance Services Ltd | Construction | 2023 |
| Built by Cornerstone Roofing Ltd | Construction | 2019 |
| Bulinski Consultancy Ltd | Construction | 2024 |
| Bull Brown Ltd | Professional & scientific | 2026 |
| Bullear Residents Association Limited | Households | 1992 |
| Buns and Zeros Ltd | Information & communication | 2021 |
| Burghley Management Co. Limited | Households | 1978 |
| Burncroft Management Limited | Households | 1971 |
| Burnham Signs Limited | Wholesale & retail | 1972 |
| Burning Room Ltd | Administrative & support | 2018 |
| Business Publishing International Ltd. | Administrative & support | 1997 |
| Buy to Benefit Limited | Wholesale & retail | 2006 |
| BW Consulting Limited | Professional & scientific | 2026 |
| BWD Property Limited | Real estate | 2013 |
| BY ALL Accounts Sussex Limited | Professional & scientific | 2021 |
| Byfield Allen Associates Limited | Professional & scientific | 2015 |
| Byrne & SON Property Ltd | Households | 2021 |
| Byte by Byte Ltd | Information & communication | 2024 |
| C & M Maritime Consultants Limited | Professional & scientific | 2014 |
| C B Nickson Consultancy Limited | Construction | 2014 |
| C Suleyman Healthcare Ltd | Health & social care | 2023 |
| C Warnham Electrical Services Ltd | Construction | 2017 |
| C&C Consultancy Limited | Information & communication | 2023 |