| Bagshaw Consulting Limited | Professional & scientific | 2020 |
| Balabio Ltd | Extraterritorial | 2023 |
| Bangladeshi Spice Ltd | Extraterritorial | 2017 |
| Barber & Barber Investments Ltd | Real estate | 2019 |
| Barber & Barber Ltd | Other services | 2014 |
| Barnbrook Consulting Ltd | Information & communication | 2024 |
| Barry Walker Property Investments Ltd | Real estate | 2023 |
| Battersea Inns Limited | Hospitality | 1997 |
| Bauhaus Projects Ltd | Construction | 2021 |
| Bayford Road Limited | Real estate | 2013 |
| BC Building & Roofing Sussex Ltd | Construction | 2025 |
| BCJ Plumbing & Heating Ltd | Construction | 2025 |
| BCS Access Ltd | Construction | 2025 |
| Bcurious Ltd | Education | 2021 |
| BDM CX Limited | Education | 2026 |
| BDM Talk Limited | Education | 2014 |
| BDP & Sons Limited | Construction | 2017 |
| Beacon Facilities Management Limited | Administrative & support | 2008 |
| Beacon Geotechnical Surveys Ltd | Construction | 2019 |
| Beaconview Limited | Financial services | 2020 |
| Beards Place Farm Group Ltd | Manufacturing | 2025 |
| Beasley Construction Ltd | Construction | 2023 |
| Becalm Quality Care Ltd | Health & social care | 2016 |
| Beckett Architectural & Consultancy Services Limited | Professional & scientific | 2015 |
| Becky Wells Limited | Health & social care | 2012 |
| Bee-Side the Seaside Ltd | Real estate | 2024 |
| Beech Court Management Company East Grinstead Limited | Extraterritorial | 2008 |
| Beedes Limited | Professional & scientific | 1997 |
| Beeston Drive Freehold Limited | Households | 2018 |
| Beetle Garage Limited | Wholesale & retail | 2022 |
| Belgravia Styles Ltd | Manufacturing | 2024 |
| Benbro Limited | Real estate | 2019 |
| Bennett and Newell Notaries Limited | Professional & scientific | 2011 |
| Bennett Oakley Elliott Limited | Professional & scientific | 2021 |
| Bennett Oakley Limited | Professional & scientific | 2012 |
| Bennetts Decorating Services Ltd | Construction | 2007 |
| Bennett’S MOT & Service Centre Ltd | Wholesale & retail | 2022 |
| Beytug Textile UK Limited | Manufacturing | 2013 |
| BGM Holdings Limited | Professional & scientific | 1983 |
| Bhillfood Limited | Hospitality | 2026 |
| Bhillsub Limited | Hospitality | 2024 |
| Bhrigu Limited | Real estate | 2021 |
| Bhrigu Retreats Limited | Hospitality | 2023 |
| Big Time Town Ltd | Hospitality | 2025 |
| Biga Pizza Company Ltd | Hospitality | 2023 |
| BIH Limited | Professional & scientific | 1997 |
| Bijou Investments Limited | Financial services | 2019 |
| Bikes of Brighton Limited | Extraterritorial | 2007 |
| Billington Place Management Company Limited | Households | 2011 |
| Biosphere Ltd | Extraterritorial | 2006 |
| Birchen Oak (Lindfield) Management Company Limited | Households | 2017 |
| Bisley Partners Ltd | Agriculture & fishing | 2007 |
| BKE Installations Limited | Construction | 2024 |
| BKK Burgess Hill Ltd | Hospitality | 2024 |
| Black Diamond Financial Services Ltd | Information & communication | 2018 |
| Black Sheep Engineering Limited | Construction | 2016 |
| Blackbird Brewing Ltd | Manufacturing | 2020 |
| Blackdog Estate | Financial services | 2017 |
| Blackdog Estate Holdings Ltd | Financial services | 2020 |
| Blackdog Estate Investments Ltd | Financial services | 2018 |
| Blackdog Retreat LLP | | 2020 |
| Blackfriar Media Limited | Information & communication | 2017 |
| Blackness Lane (Woking) Management Company Limited | Households | 2018 |
| Blink Media House Ltd | Information & communication | 2025 |
| Bloomery Way (Maresfield) Management Company Ltd | Households | 2021 |
| Bloxham Construction Limited | Construction | 2017 |
| Bloxham Leisure Ltd | Hospitality | 2025 |
| Bluauto Limited | Wholesale & retail | 2015 |
| Blue Eyed Sun Ltd | Manufacturing | 2005 |
| Blue Eyed Sun Trading Ltd | Manufacturing | 2021 |
| Blue Sky Operations Limited | Administrative & support | 2012 |
| Blue TOR Consulting Ltd | Professional & scientific | 2003 |
| Bluebox Automotive Limited | Wholesale & retail | 2013 |
| Bluechip Holdco Ltd. | Wholesale & retail | 2017 |
| Bluefin Properties Limited | Real estate | 2000 |
| Bluelite Graphics Limited | Manufacturing | 1997 |
| Bluestack Technology Ltd | Information & communication | 2015 |
| Blutex Limited | Wholesale & retail | 2003 |
| Bmvl Club Limited | Professional & scientific | 2020 |
| BN Homestyle Interiors Ltd | Construction | 2025 |
| BNG Hub Limited | Hospitality | 2023 |
| Bodaiz Ltd | Information & communication | 2023 |
| Bodle Bros Limited | Wholesale & retail | 1947 |
| Bonnett Wealth Management Limited | Financial services | 2025 |
| Bookham Industrial Park Occupiers Limited | Real estate | 2008 |
| Bookkeeping Genies Ltd | Administrative & support | 2018 |
| Boom Arts Academy Ltd | Arts & recreation | 2015 |
| Boom Arts Creative Futures CIC | Education | 2026 |
| Borayla Ltd | Other services | 2023 |
| Bosco Catholic Education Trust | Education | 2017 |
| Boss Level Creative Ltd | Information & communication | 2024 |
| Botaniqa Limited | Professional & scientific | 2025 |
| Bourlet Ventures Limited | Professional & scientific | 2019 |
| Boustead International Heaters Limited | Professional & scientific | 1997 |
| Boxalbrook Stud and Forge Ltd. | Agriculture & fishing | 2009 |
| Bpry Limited | Information & communication | 2014 |
| BQ Foods Ltd | Wholesale & retail | 2022 |
| Bradbury Close (East Preston) Management Company Limited | Households | 2016 |
| Bradford Builders of Lindfield Limited | Construction | 2008 |
| Bread of Life Ltd | Manufacturing | 2020 |