| Belle Property Group Ltd | Real estate | 2020 |
| Belle's Petals & Events Ltd | Arts & recreation | 2021 |
| Bellfield Developments Limited | Construction | 2021 |
| Bellhouse Security Ltd | Administrative & support | 1999 |
| Bellissimo Aesthetics Ltd | Other services | 2019 |
| Bello Motorcycles Ltd | Other services | 2020 |
| Bellson’S Property Developments Ltd | Construction | 2019 |
| Bellstar Homes Limited | Construction | 1997 |
| Belru Real Estate Limited | Real estate | 2019 |
| Belvia Property Ltd | Real estate | 2023 |
| Bemm Property Services Ltd | Construction | 2011 |
| BEN Warren Developments Limited | Construction | 2021 |
| BEN Warren Hospitality Limited | Other services | 2022 |
| BEN Warren Properties Limited | Real estate | 2015 |
| BEN Warren Property Rental Limited | Real estate | 2021 |
| Benchmark Builders & Decorators Limited | Construction | 2003 |
| Benefit Cosmetics Limited | Wholesale & retail | 2000 |
| Benj Ltd | Construction | 2021 |
| Benji Lifecare Ltd | Health & social care | 2023 |
| Benmax Build Ltd | Construction | 2016 |
| Benmax Group Limited | Real estate | 2025 |
| Benmax Holdings Limited | Real estate | 2025 |
| Benoxer Products Ltd | Manufacturing | 2004 |
| Benrosejohnson Limited | Real estate | 2020 |
| Bensin Haulage Limited | Transport & logistics | 2017 |
| Bentfield Consultants Ltd | Professional & scientific | 2017 |
| Bentley-Middleton Electrical (BME) Limited | Construction | 2016 |
| Benzaiden Investments Ltd | Real estate | 2021 |
| Berechurch Financial Solutions Limited | Financial services | 2025 |
| Beresford & Barnes Limited | Professional & scientific | 2017 |
| Beresford Group Holdings Limited | Financial services | 2026 |
| Beresford Group Limited | Professional & scientific | 1987 |
| Beresford Property Holdings Limited | Financial services | 2026 |
| Beresfords Commercial Limited | Extraterritorial | 2006 |
| Beresfords Financial Services Limited | Extraterritorial | 2003 |
| Beresfords Lettings Limited | Real estate | 1987 |
| Beresfords Residential Limited | Real estate | 1987 |
| Berg Group Limited | Manufacturing | 2026 |
| Berke Fine Fussell Limited | Professional & scientific | 2000 |
| Berkeley Cleaning Services Limited | Other services | 2004 |
| Berry Blueberg Limited | Real estate | 2025 |
| Berry Ingredients Limited | Wholesale & retail | 2019 |
| Bertama Ltd | Wholesale & retail | 2021 |
| Beso London Ltd | Hospitality | 2020 |
| Bespoke LOG Homes LLP | | 2019 |
| Bespoke Bars Limited | Hospitality | 2003 |
| Bespoke Case Makers & Packers Ltd | Administrative & support | 2017 |
| Bespoke Estetique Limited | Wholesale & retail | 2018 |
| Bespoke Luxury Travel Ltd | Administrative & support | 2008 |
| Bespoke Pergola Ltd | Manufacturing | 2026 |
| Bespoke Trade Solutions (Chelmsford) Limited | Construction | 2013 |
| Bespoke Trading Ltd | Wholesale & retail | 2019 |
| Bessel & BRO Limited | Real estate | 2004 |
| Best Abode Ltd | Real estate | 2022 |
| Best Chelmsford Grocery Shop Ltd | Other services | 2023 |
| Best Choice Moulsham Ltd | Wholesale & retail | 2025 |
| Best Cleaning UK Ltd | Administrative & support | 2023 |
| Best Deals Online Ltd | Wholesale & retail | 2018 |
| Best Fake Skin Ltd | Arts & recreation | 2025 |
| Best for Training Limited | Education | 2017 |
| Best Home 4 YOU Property Ltd | Real estate | 2020 |
| Best Lawns Limited | Wholesale & retail | 2016 |
| Best Resources Limited | Wholesale & retail | 2006 |
| Best Way Traders Limited | Wholesale & retail | 2026 |
| Bestronic Distribution Ltd | Wholesale & retail | 2018 |
| Bestway Developments Ltd | Professional & scientific | 2003 |
| Bestway Roofing Ltd | Construction | 2025 |
| BET Solutions International Limited | Arts & recreation | 2002 |
| Beth Amaro Consulting Limited | Professional & scientific | 2023 |
| Beth-May Design Ltd | Arts & recreation | 2019 |
| Bethel Assemblies of GOD Church CIC | Public administration | 2023 |
| Bethelgroups Limited | Information & communication | 2005 |
| Betsi Ltd | Professional & scientific | 2002 |
| Better Agency Limited | Professional & scientific | 2012 |
| Better Mondays Limited | Information & communication | 2016 |
| Better Primary Mathematics Limited | Education | 2015 |
| Better Your Life Ltd | Other services | 2018 |
| Bettercar Limited | Wholesale & retail | 2016 |
| Bettercar Trade Limited | Wholesale & retail | 2017 |
| BEW Air Source Heat Pumps (Division) Ltd | Construction | 2024 |
| BEW Electrical Distributors (Holdings) Limited | Financial services | 2023 |
| BEW Electrical Distributors Limited | Wholesale & retail | 1983 |
| Bewick PME Limited | Construction | 2009 |
| Beyond ALL Heating Plumbing and GAS Ltd | Construction | 2025 |
| Beyond Glass Ceiling Ltd | Real estate | 2025 |
| Beyond Limits (UK) Limited | Construction | 2012 |
| Beyondtheborders Limited | Information & communication | 2024 |
| Beza Engineering Ltd | Construction | 2008 |
| Bezel and Bracelet Limited | Wholesale & retail | 2023 |
| Bezna Theatre Ltd. | Arts & recreation | 2018 |
| BF Consult Limited | Professional & scientific | 2023 |
| BG Motors Writtle Limited | Wholesale & retail | 2026 |
| BGE Digital Limited | Construction | 2011 |
| BGE Digital SW Limited | Construction | 2021 |
| BGL Investments Ltd | Professional & scientific | 2005 |
| BGL Markets Ltd | Financial services | 2015 |
| BGM Records Ltd | Information & communication | 2022 |
| BGS Distributions Ltd | Wholesale & retail | 2025 |
| Bhadra Maruti Limited | Professional & scientific | 2025 |
| Bhairavax Ltd | Financial services | 2025 |