| Brandapad Limited | Manufacturing | 2012 |
| Branded Pads Limited | Manufacturing | 2011 |
| Brands Incorporated Limited | Administrative & support | 2006 |
| Brandville Studios Ltd | Information & communication | 2026 |
| Branxholme PUB Company Ltd | Hospitality | 2012 |
| Brayfield Property Ltd | Real estate | 2021 |
| Brazen Investments Limited | Real estate | 2019 |
| BRB Worldwide Ltd | Hospitality | 2024 |
| Breadbox Studios Limited | Information & communication | 2023 |
| Breathe Payroll Services Limited | Professional & scientific | 2023 |
| Bred in the Bone Theatre Company | Arts & recreation | 2009 |
| Breda Flaherty Associates Ltd | Professional & scientific | 2003 |
| Breeze Hospitality Limited | Hospitality | 2025 |
| Brelgate Limited | Transport & logistics | 1975 |
| Brent Taunton Joinery Limited | Construction | 2003 |
| Brewery Visual Effects Limited | Administrative & support | 2010 |
| Brian Ball Education Consultants Limited | Education | 2015 |
| Briant Communications (Sussex) Ltd | Construction | 2014 |
| Brickplicity Ltd | Professional & scientific | 2023 |
| Bricks and Mortar Photography Ltd | Professional & scientific | 2021 |
| Brickyard Cottages Management Company Ltd | Households | 2020 |
| Bridge Construction Southern Ltd | Construction | 2011 |
| Bridgers Windows Limited | Construction | 2021 |
| Bridgewater & Mckenzie Investments Limited | Construction | 2013 |
| Bridgeway Together CIC | Health & social care | 2026 |
| Bridgley Consultancy Limited | Financial services | 2019 |
| Bridon Asset Management Ltd | Real estate | 2015 |
| Bridon Farm Foods Limited | Wholesale & retail | 2005 |
| Brierley & COE Limited | Real estate | 2014 |
| Briggs & Co Contracting Ltd | Manufacturing | 2019 |
| Bright & Beautiful Gardens West Sussex Limited | Administrative & support | 2016 |
| Bright Code Labz Ltd | Information & communication | 2026 |
| Bright Eco Construction Ltd | Construction | 2024 |
| Bright Flower Retreats Ltd | Other services | 2024 |
| Bright Future Design & Consultants Ltd | Real estate | 2009 |
| Bright Investment (UK) Ltd | Real estate | 2011 |
| Bright Kiddies Ltd | Education | 2014 |
| Bright Sparks Alternative Provision Ltd | Education | 2023 |
| Bright Star Community Project CIC | Health & social care | 2025 |
| Bright Venter Commerce Ltd | Wholesale & retail | 2026 |
| Brighten & Flow Ltd | Arts & recreation | 2025 |
| Brightlaw Limited | Professional & scientific | 2009 |
| Brightmatter Limited | Administrative & support | 2007 |
| Brighton & Hove Construction Limited | Construction | 2014 |
| Brighton and Hove Holiday Homes Ltd | Professional & scientific | 2019 |
| Brighton and Hove Law Limited | Professional & scientific | 2017 |
| Brighton Aviation Ltd | Education | 2019 |
| Brighton Brat Club Ltd | Wholesale & retail | 2018 |
| Brighton Builders Limited | Construction | 2003 |
| Brighton Forward Ltd | Education | 2021 |
| Brighton Gymnastics Club Ltd | Arts & recreation | 2026 |
| Brighton Holiday Apartments Ltd | Hospitality | 2023 |
| Brighton Home Improvement Limited | Extraterritorial | 2013 |
| Brighton Indian Ltd | Hospitality | 2019 |
| Brighton Pilates Limited | Other services | 2011 |
| Brighton Podiatry Ltd | Health & social care | 2012 |
| Brighton Production Hub Ltd | Administrative & support | 2020 |
| Brighton Road Garage Ltd | Wholesale & retail | 2025 |
| Brighton Road Motors Limited | Wholesale & retail | 2021 |
| Brighton Spiegeltent Ltd | Arts & recreation | 2013 |
| Brightorange Communications Ltd | Information & communication | 2016 |
| Brightwell Creative Limited | Administrative & support | 2016 |
| Brilliant Futures Limited | Other services | 2007 |
| Brilliant Maintenance Ltd | Construction | 2025 |
| Brisa Dorada Inns Limited | Hospitality | 2025 |
| Brisa Marina Inns Limited | Hospitality | 2023 |
| Brise Soleil UK Ltd | Manufacturing | 2021 |
| Bristell UK Limited | Administrative & support | 2012 |
| Brit Fleet Rental Limited | Administrative & support | 2020 |
| Brit Fleet Services Limited | Administrative & support | 2016 |
| Britannia Site Services Ltd | Administrative & support | 2024 |
| Britda Ltd | Wholesale & retail | 2025 |
| Britlease Equipment Limited | Administrative & support | 2025 |
| Brix Limited | Construction | 2004 |
| Brix Plumbing & Heating Limited | Manufacturing | 2011 |
| Brizebox Ltd | Wholesale & retail | 2019 |
| BRK Sign and Print Ltd | Professional & scientific | 2022 |
| Broadlands Paving Limited | Construction | 2022 |
| Broadreach Technology Limited | Administrative & support | 2014 |
| Broadwater Autos Limited | Wholesale & retail | 2020 |
| Broadwater Manor Properties Limited | Real estate | 2002 |
| Broadwater Nails Ltd | Other services | 2026 |
| Broadwater Project Services Limited | Professional & scientific | 2009 |
| Broadwater Support Group CIC | Administrative & support | 2020 |
| Broadwater Swimming School Ltd | Education | 2023 |
| Broadway Academy Limited | Education | 2023 |
| Broccoli MUM Limited | Wholesale & retail | 2025 |
| Brockham Commercial Limited | Construction | 2025 |
| Brockwell Car Sales Limited | Wholesale & retail | 2014 |
| Broken Puppet Worthing Limited | Other services | 2025 |
| Broken Soulz Ltd | Information & communication | 2019 |
| Brook House Property Management Limited | Other services | 2008 |
| Brookfield Marquees Limited | Administrative & support | 2007 |
| Brooklands Cafe Ltd | Hospitality | 2022 |
| Brosis Café Ltd | Hospitality | 2019 |
| Brotan (Wickford) Limited | Construction | 1996 |
| Brothers Global Investment Limited | Real estate | 2022 |
| Brothers Insulation Ltd | Construction | 2025 |
| Brough Investments LLP | | 2024 |
| Broughton & Co. Limited | Professional & scientific | 1998 |