| Brighton Theatre Factory Ltd | Extraterritorial | 2002 |
| Brighton Therapy Centre Limited | Health & social care | 2011 |
| Brighton Therapy Partnership Ltd | Other services | 2014 |
| Brighton Therapy Rooms Limited | Other services | 2025 |
| Brighton Tools and Fixings Limited | Wholesale & retail | 1991 |
| Brighton Top Cuts Ltd | Other services | 2025 |
| Brighton Toy and Model Museum | Arts & recreation | 1990 |
| Brighton TPA Limited | Arts & recreation | 2020 |
| Brighton Trade in Ltd | Wholesale & retail | 2025 |
| Brighton Trade Windows Limited | Construction | 2000 |
| Brighton Trading Ltd | Real estate | 2023 |
| Brighton Traffic Management Ltd | Professional & scientific | 2012 |
| Brighton Tyres and Exhausts Limited | Wholesale & retail | 2026 |
| Brighton Unemployed Centre | Health & social care | 1988 |
| Brighton Upholstery Ltd | Professional & scientific | 2017 |
| Brighton Vehicle Supplies Limited | Wholesale & retail | 2018 |
| Brighton Vinyl Finds Limited | Wholesale & retail | 2018 |
| Brighton Waldorf School Limited | Education | 1989 |
| Brighton Warm Roof Project CIC | Professional & scientific | 2026 |
| Brighton Waste & Recycling Limited | Water & waste | 2023 |
| Brighton Webtech Ltd | Information & communication | 2017 |
| Brighton Wellbeing Ltd | Education | 2025 |
| Brighton Women's Centre | Health & social care | 1991 |
| Brighton Wooden IT BE Nice Limited | Manufacturing | 2022 |
| Brighton Wound Care Ltd | Professional & scientific | 2011 |
| Brighton Y.M.C.A. | Hospitality | 1988 |
| Brighton Youth Centre | Health & social care | 2002 |
| Brighton ZOO Limited | Information & communication | 2022 |
| Brighton, Hove & District Motor Services Ltd | Wholesale & retail | 2024 |
| Brighton-Lusaka Health Link | Health & social care | 2011 |
| Brightonrumours Ltd | Hospitality | 2025 |
| Brightons Bathrooms Ltd | Construction | 2014 |
| Brightonshine Ltd | Administrative & support | 2025 |
| Brightontour Ltd | Administrative & support | 2026 |
| Brightonyoga Ltd | Arts & recreation | 2021 |
| Brightpool Properties Limited | Real estate | 2019 |
| Brightrock Ventures Limited | Real estate | 2018 |
| Brightside CH5 Limited | Real estate | 2023 |
| Brightside Chichester Limited | Real estate | 2025 |
| Brightside Facilities Limited | Professional & scientific | 2025 |
| Brightside G71 Limited | Real estate | 2023 |
| Brightside Holdings Limited | Energy | 2018 |
| Brightside JVS Limited | Real estate | 2025 |
| Brightside Marketing Ltd | Professional & scientific | 2014 |
| Brightside Media Ltd | Information & communication | 2013 |
| Brightside NE12 Limited | Real estate | 2023 |
| Brightside S35 Limited | Real estate | 2023 |
| Brightstay (Sussex) Limited Liability Partnership | | 2016 |
| Brightstone Construction Company Limited | Construction | 1999 |
| Brightstore CIC | Hospitality | 2021 |
| Brightup Cleaners Ltd | Administrative & support | 2021 |
| Brightware Ltd | Information & communication | 2007 |
| Brightwave Renewables & Electrical Ltd | Professional & scientific | 2025 |
| Brightwhite Developments Limited | Real estate | 2017 |
| Brightwood Enterprises Limited | Hospitality | 2014 |
| Briho Residents Company Limited | Households | 2003 |
| Brikel Investments Ltd | Construction | 2025 |
| Brilliant Noise Limited | Administrative & support | 2010 |
| Bring Impact Ltd | Professional & scientific | 2024 |
| Brinigirl Limited | Arts & recreation | 2022 |
| Brioeventsuk Ltd | Arts & recreation | 2026 |
| Bristol Estate Leaseholders & Tenants Association CIC | Other services | 2020 |
| Bristol Mansions (Brighton) Limited | Households | 2010 |
| Bristow Heritage Brickwork Ltd | Construction | 2025 |
| Brit Home Improvements Limited | Construction | 2015 |
| Britania AU Pair Ltd | Other services | 2018 |
| Britannia Intelligence Group Ltd | Information & communication | 2025 |
| Britanniacomms Digital Limited | Professional & scientific | 2021 |
| Brite Blinds Limited | Manufacturing | 2004 |
| British Crop Protection Enterprises Limited | Arts & recreation | 1989 |
| Britmoz Limited | Information & communication | 2015 |
| Brittechcare Ltd | Wholesale & retail | 2026 |
| Briwand Computers Limited | | 1981 |
| Brixhaven Ltd | Professional & scientific | 2025 |
| BRM Egremont House Limited | Hospitality | 2021 |
| BRM Restaurants Limited | Hospitality | 2022 |
| BRM Sussex Ltd | Hospitality | 2025 |
| Broadacre Estates Limited | Real estate | 2000 |
| Broadcroft Contracts Limited | Wholesale & retail | 1986 |
| Broadlight Global Ltd | Information & communication | 2019 |
| Broken Riders Limited | Wholesale & retail | 2013 |
| Brombard Trustees Limited | Administrative & support | 1979 |
| Bromley and Beckenham Schoolwear Ltd | Wholesale & retail | 2025 |
| Bromley Schoolwear Limited | Wholesale & retail | 2011 |
| Bronze Land Ltd | Hospitality | 2022 |
| Brood Family Studio Ltd | Education | 2022 |
| Brook View Residents Management Company Limited | Households | 2020 |
| Brookband International Limited | Financial services | 2022 |
| Brooker Crane Hire Limited | Administrative & support | 2025 |
| Brooker Plant & Haulage Limited | Transport & logistics | 2025 |
| Brooker Ventures Limited | Professional & scientific | 2025 |
| Brookgrade Limited | Real estate | 1976 |
| Brooklands Glass Centre Ltd | Professional & scientific | 2003 |
| Brooklands Glass Holdings Ltd | Financial services | 2025 |
| Brooklyn & Bay Ltd | Professional & scientific | 2020 |
| Brooks & Co Consulting Services Limited | Information & communication | 2019 |
| Brooks Empire Limited | Construction | 2022 |
| Broom Fendley Salmon Limited | Professional & scientific | 2025 |
| Broomans Terrace (Lewes) Management Company Limited | Households | 2011 |
| Broome/Gekoski Limited | Professional & scientific | 2015 |