| Banstead Garage Doors and Gates Limited | Manufacturing | 2024 |
| Banyan Retreat | Education | 2017 |
| Baphomet-Forging Strength Ltd | Wholesale & retail | 2024 |
| Baqa Process Solutions Limited | Professional & scientific | 2011 |
| Bar-Hill Chef Ltd | Hospitality | 2025 |
| Barakah Services Limited | Professional & scientific | 2008 |
| Barbara's Green Limited | Real estate | 2024 |
| Barcode Traders Limited | Wholesale & retail | 2008 |
| Barden Energy (South East) Limited | Professional & scientific | 2024 |
| Barden Lettings Ltd | Real estate | 2024 |
| Bareham Investments (UK) Limited | Real estate | 1986 |
| Bareham Properties Limited | Real estate | 1998 |
| Barfrestone Court Farms Limited | Agriculture & fishing | 1997 |
| Bargain Direct Limited | Wholesale & retail | 2010 |
| Bargain Pond Limited | Information & communication | 2017 |
| Barham LAB Services Ltd | Agriculture & fishing | 2019 |
| Barham Property Services Ltd | Other services | 2025 |
| Barker Bond Properties Limited | Real estate | 2019 |
| Barker Murray Architecture Limited | Professional & scientific | 2001 |
| Barklee Place Ltd | Other services | 2025 |
| Barks Limited | Administrative & support | 2009 |
| Barlow Assets Ltd | Real estate | 2025 |
| Barn's Designs Limited | Construction | 2013 |
| Barnes Carpentry Services Ltd | Manufacturing | 2022 |
| Barnes Webster (Developments) Limited | Construction | 1981 |
| Barnes Webster (Holdings) Limited | Professional & scientific | 2002 |
| Barnfield Cars Ltd | Wholesale & retail | 2012 |
| Barnfield Management Limited | Real estate | 2022 |
| Barni Trans Ltd | Transport & logistics | 2025 |
| Barns Property Ltd | Real estate | 2022 |
| Barnsmoor Estates Limited | Construction | 2016 |
| Barradale Eggs Limited | Wholesale & retail | 2008 |
| Barrington Coms Ltd | Information & communication | 2019 |
| Barterik Limited | Information & communication | 2014 |
| Baruch Home Services Ltd | Real estate | 2025 |
| Baseflair Limited | Real estate | 1995 |
| Basenineteen Ltd | Other services | 2023 |
| Basra Construction Group Limited | Construction | 2021 |
| Bass Roofing Ltd | Construction | 2019 |
| Bastion Property Ltd | Real estate | 2017 |
| Basutaproperties Ltd | Real estate | 2024 |
| Batana Follica Ltd | Professional & scientific | 2026 |
| Bath Korean Food Ltd | Wholesale & retail | 2025 |
| Bathroom Worx Limited | Construction | 2017 |
| Battle BAG Limited | Manufacturing | 2018 |
| Batts Haulage Ltd | Water & waste | 2018 |
| BAX Thomas French Ltd | Real estate | 2010 |
| Bay Tree Landscapes Ltd | Administrative & support | 2019 |
| Bay View (Broadstairs) Management Company Limited | Households | 2025 |
| Bay View Hotel Swansea Limited | Hospitality | 2018 |
| Bayhill Developments Ltd | Construction | 2020 |
| Baylei Brickwork Ltd | Construction | 2026 |
| Baylis Property Limited | Real estate | 2016 |
| Baynards (Witley) Property Limited | Real estate | 2025 |
| Bays Development Ltd | Real estate | 2020 |
| BBB Construction (Kent) Limited | Construction | 2020 |
| Bbeautiful Products Limited | Wholesale & retail | 2014 |
| Bborg Ltd | Wholesale & retail | 2022 |
| BBR Home Builds Ltd | Construction | 2019 |
| BBR Homes Ltd | Construction | 2018 |
| BC Creative Solutions Ltd | Administrative & support | 2020 |
| BC Networks Limited | Administrative & support | 2016 |
| Bc&B Limited | Professional & scientific | 2021 |
| Bccr Limited | Administrative & support | 2024 |
| Bcene Limited | Professional & scientific | 2025 |
| BCP Renewables Ltd | Construction | 2025 |
| BDE Tech Ltd | Information & communication | 2019 |
| BDH Enterprises Ltd | Professional & scientific | 2025 |
| BDI Emea Limited | Extraterritorial | 2024 |
| BE Aspired Limited | Information & communication | 2019 |
| BE One Systems Limited | Manufacturing | 2026 |
| Beach-Side Cars & Car Wash Services Ltd | Wholesale & retail | 2022 |
| Beachwood Construction Limited | Construction | 2017 |
| Beachwood Leisure Ltd | Wholesale & retail | 2020 |
| Beacon Bliss Healthcare Ltd | Health & social care | 2023 |
| Beacon Electricians Ltd | Energy | 2015 |
| Beacon Pharmaceuticals Limited | Manufacturing | 2000 |
| Bealetech Software Ltd | Information & communication | 2025 |
| Beam Directors Services Ltd | Extraterritorial | 2012 |
| Beam HR Ltd | Extraterritorial | 2012 |
| Beam Organisation Ltd | Extraterritorial | 2012 |
| Beam Training Ltd | Extraterritorial | 2012 |
| Bean & Ballantyne Properties Limited | Real estate | 2020 |
| Bean There W10 Limited | Hospitality | 2024 |
| Bean There, BUN That Co Ltd | Hospitality | 2026 |
| Bear & Mind Chefs Ltd | Hospitality | 2022 |
| Bear to BEE C.I.C. | Construction | 2023 |
| Bearded Viking Ltd | Construction | 2019 |
| Bearing Store Limited | Professional & scientific | 2010 |
| Bearingshopuk Ltd | Wholesale & retail | 2014 |
| Beau Clinic Limited | Other services | 2020 |
| Beaudurof Limited | Manufacturing | 2015 |
| Beaumont Hair Limited | Other services | 2018 |
| Beaumont Properties (Surrey) Ltd | Real estate | 2021 |
| Beautifulbravebody Ltd | Other services | 2018 |
| Beauty and Nailbar (PVT) Ltd | Wholesale & retail | 2020 |
| Beauty Corner Ashford Limited | Other services | 2024 |
| Beauty International Limited | Professional & scientific | 1984 |
| Beauty Shots Aesthetics Ltd | Other services | 2025 |
| Beaver Community Trust Ltd | Education | 2002 |