| Bazzar Print Solutions Limited | Manufacturing | 2019 |
| BBS Metal Work Ltd | Construction | 2018 |
| Bcrecruitment Ltd | Administrative & support | 2026 |
| Bcsc Holdings Limited | Manufacturing | 2019 |
| BE 1 Star Ltd | Information & communication | 2025 |
| BE1STAR.ACTOR Ltd | Professional & scientific | 2025 |
| BE1STAR.CLOTHING Ltd | Wholesale & retail | 2025 |
| BEA Heaton Ltd | Information & communication | 2024 |
| Beacon Financial and Management Consulting Services Ltd. | Professional & scientific | 2009 |
| Bear Necessities Services Limited | Professional & scientific | 2024 |
| Bearwood Tree Services Ltd | Agriculture & fishing | 2017 |
| Beau Apparel Ltd | Wholesale & retail | 2023 |
| Beau Blooms by Sarah Ltd | Wholesale & retail | 2025 |
| Beaucroft Mansions RTM Company Limited | Households | 2008 |
| Beaumont's Butchers of Braintree Ltd | Wholesale & retail | 2019 |
| Beautiful Mindset Education Limited | Education | 2025 |
| Beautii Boost Ltd | Health & social care | 2025 |
| Beazley END Limited | Agriculture & fishing | 2009 |
| Bechar Property Limited | Real estate | 2018 |
| Bedeski Consulting Limited | Professional & scientific | 2017 |
| Beebee Homes Ltd | Real estate | 2023 |
| Beeyou Events Ltd | Other services | 2021 |
| Beeyou Holdings Ltd | Financial services | 2021 |
| Beeyou Records Ltd | Information & communication | 2020 |
| Behuman.Boutique Ltd | Wholesale & retail | 2025 |
| Behuman.Ceo Ltd | Professional & scientific | 2025 |
| Behuman.Investments Ltd | Financial services | 2025 |
| Behuman.Social Ltd | Information & communication | 2025 |
| Behuman.Software Ltd | Information & communication | 2025 |
| Bekir Holdings Limited | Real estate | 2024 |
| Bell Fencing Limited | Administrative & support | 2014 |
| Bellairs Enterprises Limited | Health & social care | 2022 |
| Beloved Fragrances Limited | Manufacturing | 2017 |
| Benarth Estates Ltd | Real estate | 2024 |
| Beni Preamati Limited | Wholesale & retail | 2024 |
| Benjamin Muir Ltd | Professional & scientific | 2017 |
| Bennetts Castle Limited | Health & social care | 1999 |
| Benson Motorcycle Training Limited | Education | 2021 |
| Berencourt Global Logistics Ltd | Transport & logistics | 2022 |
| Bespoke 11 Plus Ltd | Education | 2022 |
| Bespoke Cast Mouldings Ltd | Construction | 2015 |
| Best HCM Consultancy Limited | Professional & scientific | 2025 |
| Better Living Products (U.K.) Limited | Wholesale & retail | 1995 |
| Betty & Bertie’S Pet Grooming Limited | Professional & scientific | 2022 |
| BEV and Co Investment Limited | Real estate | 2020 |
| Beyond PM Ltd | Construction | 2019 |
| BGP SEN Limited | Financial services | 2023 |
| Big a Agile Ltd | Information & communication | 2024 |
| Big Bear Limited | Agriculture & fishing | 2021 |
| Big Bisque Ltd | Manufacturing | 2022 |
| Big Drums Limited | Arts & recreation | 2021 |
| BIH Consult Limited | Professional & scientific | 2020 |
| Bikers Oracle Limited | Information & communication | 2004 |
| Bill's Tackle Limited | Wholesale & retail | 2003 |
| Biocase Ltd | Extraterritorial | 2011 |
| Bir-Oz Ltd | Hospitality | 2025 |
| Birchfields Limited | Administrative & support | 2003 |
| Birchwood Capital Limited | Financial services | 2015 |
| Bird & Sons Ltd | Real estate | 1999 |
| Bird & Sons Property Development Ltd | Construction | 2009 |
| Biscuits Cafe Ltd | Hospitality | 2019 |
| Bish Trading UK Limited | Construction | 2021 |
| Bishop Nick Limited | Manufacturing | 2011 |
| Bishop Sutton & Alexander Limited | Construction | 2009 |
| Bizucation DCT Ltd | Information & communication | 2025 |
| BKN-AS1 Ltd | Real estate | 2024 |
| BL Bishops Stortford Limited | Other services | 2024 |
| Black Art Designs Limited | Manufacturing | 2006 |
| Black Barn Consulting Limited | Professional & scientific | 2011 |
| Black Eagle Hire Ltd | Administrative & support | 2022 |
| Black Notley Convenience Ltd | Wholesale & retail | 2015 |
| Black Notley Electrical Property Services Ltd | Construction | 2014 |
| Black Swan Obsidian Ltd | Financial services | 2025 |
| Blackmike Ltd | Professional & scientific | 2023 |
| Blackout Windows Tinting Ltd | Wholesale & retail | 2026 |
| Blackswanobsidan.Lawyer Ltd | Professional & scientific | 2025 |
| Blackswanobsidan.Media Ltd | Information & communication | 2025 |
| Blackswanobsidian.Accountants Ltd | Professional & scientific | 2025 |
| Blackswanobsidian.Digital Ltd | Information & communication | 2025 |
| Blackswanobsidian.Insure Ltd | Financial services | 2025 |
| Blackswanobsidian.Media Ltd | Manufacturing | 2025 |
| Blackswanobsidian.Money Ltd | Financial services | 2025 |
| Blackswanobsidian.Mortgage Ltd | Financial services | 2025 |
| Blackswanobsidian.Software Ltd | Information & communication | 2025 |
| Blackswanobsidian.Tax Ltd | Professional & scientific | 2025 |
| Blackswanobsidian.Trade Ltd | Energy | 2025 |
| Blackswanobsidian.Tv Ltd | Manufacturing | 2025 |
| Blackwater Alpacas & Pygmy Goats Ltd | Agriculture & fishing | 2026 |
| Blackwater Freight Limited | Transport & logistics | 2010 |
| Blackwater Property Investments Ltd | Manufacturing | 1999 |
| Blandford Property Services Ltd | Real estate | 2019 |
| Blanking Associates Limited | Professional & scientific | 2016 |
| Blanks and More Wholesale Ltd | Wholesale & retail | 2024 |
| Blanksolar Ltd | Construction | 2026 |
| Blindmaster Limited | Manufacturing | 1999 |
| Blinds Online Ltd | Manufacturing | 2015 |
| Blitzfitme Ltd | Health & social care | 2011 |
| Block and Reserve Ltd | Financial services | 2025 |
| Bloom & Stone Ltd | Real estate | 2025 |
| Bloomcare Ltd | Health & social care | 2018 |