| Beauty in Spires Limited | Other services | 2014 |
| Beaver Lake Fishery Ltd | Agriculture & fishing | 2025 |
| Beaver Plants Properties Limited | Real estate | 2025 |
| Beavers Properties Ltd | Real estate | 2025 |
| Bebrite Commercial Cleaning Services Ltd | Administrative & support | 2025 |
| Behomed Ltd | Real estate | 2024 |
| Belgohunt Limited | Real estate | 2000 |
| Belgoprop Limited | Extraterritorial | 2016 |
| Belgrove Estates Ltd | Hospitality | 2025 |
| Belgrove Holdings Ltd | Hospitality | 2026 |
| Bella Vista Property Management Limited | Real estate | 2020 |
| Bene Velle Limited | Wholesale & retail | 2019 |
| Benjamin Whittaker Limited | Professional & scientific | 2021 |
| Benjamins Motor Company Limited | Wholesale & retail | 2014 |
| Ben’S Pest Solutions Limited | Professional & scientific | 2019 |
| Berrywood Contractors Ltd | Construction | 2015 |
| Berto Property Ltd | Real estate | 2018 |
| Bespoke Bathroom Brand Consultants Ltd | Professional & scientific | 2024 |
| Bespoke Blind Solutions Ltd | Wholesale & retail | 2021 |
| Bespoke Epilepsy Training Ltd | Health & social care | 2015 |
| Bespoke Lofts and Extensions Ltd | Construction | 2020 |
| Bespoke Money Limited | Financial services | 2016 |
| Bespoke Multimedia Limited | Extraterritorial | 2018 |
| Best United Football Limited | Education | 2025 |
| Bestline Consulting Ltd | Information & communication | 2022 |
| Bestoil Ltd | Manufacturing | 2022 |
| Besuco Ltd | Administrative & support | 2023 |
| Betsa Capital Partners Limited | Financial services | 2017 |
| Betsa Developments Limited | Real estate | 2015 |
| Betsa Properties Limited | Real estate | 2000 |
| Better Alternatives Limited | Health & social care | 2011 |
| Better Movement Physio Limited | Health & social care | 2024 |
| Better Systems Ltd | Professional & scientific | 2014 |
| Between Oceans Solutions Ltd | Administrative & support | 2022 |
| BEX18 Ltd | Other services | 2018 |
| Beyond Blinds & Shutters Ltd | Construction | 2021 |
| Beyond Media Productions Ltd. | Arts & recreation | 2007 |
| Beyond the Scene Post-Production Ltd | Information & communication | 2025 |
| Biancamila Ltd | Administrative & support | 2016 |
| Bianco Logistics Ltd | Transport & logistics | 2026 |
| Biloba Limited | Real estate | 2015 |
| Bio-World Products Ltd | Manufacturing | 2023 |
| Bionic Associates Ltd | Information & communication | 2020 |
| Bionova Holding Limited | Financial services | 2024 |
| Bioscience Productions Ltd | Information & communication | 2019 |
| Bircotes Homes Limited | Real estate | 2025 |
| Bircotes Limited | Real estate | 2025 |
| Bircotes Property Limited | Real estate | 2019 |
| Birdhurst Investment Company Limited | Real estate | 1955 |
| Black Cat Graphics UK Limited | Professional & scientific | 2003 |
| Black Hare Yard Limited | Wholesale & retail | 2024 |
| Black Limited | Administrative & support | 2005 |
| Black Pepper Hospitality Limited | Hospitality | 2021 |
| Black, Red & Gold Ltd | Real estate | 2017 |
| Blackbushe Aviation Limited | Arts & recreation | 1987 |
| Blacker Limited | Information & communication | 1988 |
| Blackland Farm Ltd | Real estate | 2023 |
| Blackland Farm Outdoor Centre Ltd | Education | 2023 |
| Blackstone Chambers Limited | Other services | 1998 |
| Blackwood Books Limited | Professional & scientific | 2013 |
| Blindstar Blinds, Curtains & Shutters Ltd | Construction | 2022 |
| Blockshaft Limited | Professional & scientific | 1979 |
| Bloomara Ltd | Wholesale & retail | 2025 |
| Blue and Red Consulting Ltd | Information & communication | 2011 |
| Blue Aventurine Limited | Professional & scientific | 2021 |
| Blue Cube Security Holdings Limited | Professional & scientific | 2011 |
| Blue Cube Security Limited | Information & communication | 2010 |
| Bluebell Barn Nursery Ltd | Health & social care | 2023 |
| Bluebell Beauty Training Academy Ltd | Education | 2026 |
| Bluebell Digital Ltd | Professional & scientific | 2021 |
| Bluebells Bookkeeping Ltd | Professional & scientific | 2021 |
| Blueline Property Investments Ltd | Real estate | 2022 |
| Bluespell Limited | Information & communication | 2006 |
| Bluestar Refurbs Limited | Construction | 2016 |
| Bmgd Limited | Professional & scientific | 2024 |
| BML Plant Limited | Administrative & support | 2021 |
| BMY Company Limited | Wholesale & retail | 2021 |
| Bodmod Ltd | Health & social care | 2025 |
| Body Tech Repairs Ltd | Wholesale & retail | 2019 |
| Bolnore Village Pre-School Limited | Education | 2011 |
| Book Club (Crowborough) Limited(The) | Wholesale & retail | 1947 |
| Borja Builds Ltd | Construction | 2024 |
| Bornwise Ltd | Health & social care | 2025 |
| Bostock Software Development and Consultancy Limited | Information & communication | 1997 |
| Bourne Consultancy Solutions Limited | Professional & scientific | 2014 |
| Boutelje Trading Limited | Financial services | 2016 |
| Bowhite (Investments) Limited | Real estate | 1982 |
| Bowland Retail Limited | Professional & scientific | 2012 |
| Bowleyfi Advisory Limited | Professional & scientific | 2026 |
| Boyles Farm Car Storage Ltd | Transport & logistics | 2024 |
| Bp-Crown Services Ltd | Wholesale & retail | 2024 |
| BPL Electrical Services Limited | Construction | 2018 |
| Brackenrose Limited | Agriculture & fishing | 1996 |
| Brambletye School Services Limited | Administrative & support | 2023 |
| Brambletye School Trust Limited | Education | 1969 |
| Brand New Cars Limited | Wholesale & retail | 2024 |
| BRB Founders Ltd | Extraterritorial | 2015 |
| BRC Consulting Services Ltd | Professional & scientific | 2002 |
| Breed Solar Limited | Administrative & support | 2018 |
| Brenda Stock Limited | Real estate | 2018 |