| Banfield Estate Agents Ltd | Real estate | 2003 |
| Banfield Holding Company Ltd | Financial services | 2020 |
| Banfield Residential Management Ltd | Real estate | 2022 |
| Bann Road Solar Project Limited | Energy | 2014 |
| Bannercrowd Limited | Information & communication | 2021 |
| Bar 63 Ltd | Real estate | 2026 |
| Barbern | Professional & scientific | 1959 |
| Barchen Coffee Ltd | Manufacturing | 2025 |
| Barclay Bros Hove Ltd | Other services | 2019 |
| Barclay Court Developments Ltd | Construction | 2023 |
| Barcombe Village Shop Limited | Real estate | 2017 |
| Barefoot Academy Ltd | Education | 2023 |
| Bargain Place Ltd | Information & communication | 2014 |
| BARK365 Ltd | Other services | 2023 |
| Barkee Ltd | Wholesale & retail | 2025 |
| Barkergraves Limited | Administrative & support | 1997 |
| Barlows MEP Services Limited | Construction | 2022 |
| Barnard Flooring Limited | Construction | 2013 |
| Barnes & Binns General Store Ltd | Wholesale & retail | 2019 |
| Barnfield Shaw Management Company Limited | Households | 2025 |
| Barngrip Limited | Real estate | 2007 |
| Basanite Limited | Real estate | 2017 |
| Base Chance Ltd | Wholesale & retail | 2024 |
| Base Construction (South Yorkshire) Limited | Construction | 2019 |
| Base Supply Ltd | Wholesale & retail | 2024 |
| Basecraft Residents Association Limited | Households | 1983 |
| Baseline One Ltd | Professional & scientific | 2025 |
| Basex Sports UK Limited | Construction | 2026 |
| Basin Bridge Solar Limited | Energy | 2013 |
| Basset Strategy Limited | Administrative & support | 2012 |
| Bassett Court Residents Association Limited | Households | 1968 |
| Basu Capital Markets Ltd | Professional & scientific | 2017 |
| BAT Legal Solutions Limited | Information & communication | 2017 |
| BATFINK1974 Limited | Manufacturing | 2025 |
| Bath Court Investment Company Limited | Households | 1987 |
| Batterbee Consulting Ltd | Information & communication | 2018 |
| Batys Wine Limited | Hospitality | 2017 |
| Baubox Ltd | Wholesale & retail | 2024 |
| Bauermeister Properties Limited | Real estate | 2017 |
| Bay House Care Ltd | Health & social care | 2010 |
| Baybars Decoration Ltd | Construction | 2024 |
| Bayleaf Homes Limited | Administrative & support | 1997 |
| Bayleaf Properties Limited | Administrative & support | 2014 |
| Bayleaf Property Group Limited | Administrative & support | 2022 |
| Bayon Bakery Limited | Hospitality | 2024 |
| Bayside Property Investments Ltd | Real estate | 2013 |
| Baytree Roofing Ltd | Construction | 2026 |
| Bayway Limited | Other services | 2005 |
| Bazehill Manor Freehold Limited | Real estate | 2007 |
| BBD Group Companies Limited | Administrative & support | 2025 |
| BBZ Limited | Real estate | 2024 |
| BC Bespoke Joinery Ltd | Manufacturing | 2017 |
| BC Constructions & Renovations Ltd | Construction | 2025 |
| BCM Behavioural Science Solutions Ltd | Professional & scientific | 2019 |
| Bcn&Mrt Ltd | Health & social care | 2025 |
| Bcnc Limited | Professional & scientific | 2026 |
| Bcooked Ltd | Hospitality | 2018 |
| BDN Building Limited | Construction | 2025 |
| BDS Leadworks Ltd | Construction | 2019 |
| BE Fabulous Beauty Ltd | Other services | 2020 |
| BE More Inspired Ltd | Professional & scientific | 2024 |
| BE Your Own Guru Events Ltd | Administrative & support | 2018 |
| Beach & Lawn Limited | Wholesale & retail | 2023 |
| Beach Bandit Swimming Ltd | Arts & recreation | 2023 |
| Beach Dreams Ltd | Real estate | 2025 |
| Beach Hair Limited | Other services | 2017 |
| Beach House Properties Ltd | Real estate | 2015 |
| Beachside Brighton Ltd | Hospitality | 2021 |
| Beacon Close (Rottingdean) Residents Management Company Limited | Households | 2019 |
| Beacon Wall Limited | Real estate | 2019 |
| Beacon Woods (Burgess Hill) Residents Management Company Limited | Households | 2018 |
| Beaconfield Property Limited | Real estate | 2020 |
| Bear & Cedar Camping Ltd | Hospitality | 2026 |
| Bearhug Marketing Ltd | Professional & scientific | 2020 |
| Beatle Style Ltd | Arts & recreation | 2016 |
| Beatrice Emily Limited | Professional & scientific | 2022 |
| Beatty Dental Limited | Health & social care | 2014 |
| BEAUMONTS9 Limited | Real estate | 2025 |
| Beautiful Lofts Ltd | Construction | 2023 |
| Beauty Lounge (Hinckley) Ltd | Other services | 2015 |
| Beauty of Clay C.I.C. | Arts & recreation | 2021 |
| BEB Services UK Ltd | Education | 2017 |
| Beckon Jewel Ltd | Manufacturing | 2023 |
| Beckwell Road LLP | | 2012 |
| Beckwith (Brighton) Limited | Transport & logistics | 2002 |
| Beckwith Bucks Limited | Transport & logistics | 2025 |
| Beckwith Eastbourne Ltd | Transport & logistics | 2019 |
| Beckwith Holdings Ltd | Financial services | 2019 |
| Bedfordwell Road Management Limited | Households | 2006 |
| Bedrock TV Limited | Information & communication | 2024 |
| Beeagle Limited | Wholesale & retail | 2020 |
| Beech Eyewear Ltd | Administrative & support | 2022 |
| Beech Farm Solar Limited | Energy | 2014 |
| Beecher Communications Limited | Information & communication | 2009 |
| Beechwood Avenue Property Management Company Limited | Real estate | 2011 |
| Beechwood Joinery Southern Limited | Construction | 2008 |
| Beer & Buns Limited | Hospitality | 2016 |
| Beer Engine Trading Company Ltd | Hospitality | 2018 |
| Beers & Bands Ltd | Hospitality | 2021 |
| Bees Knees Decorating Ltd | Construction | 2024 |