| Baynes Place Management Services Limited | Households | 2008 |
| Bayon Construction Limited | Construction | 2024 |
| Baytree Capital Limited | Professional & scientific | 2016 |
| Baytree Capital Partners Limited | Professional & scientific | 2016 |
| BB Apparel Limited | Wholesale & retail | 2018 |
| BB Fit Ltd | Arts & recreation | 2024 |
| BB Healthcare Services Limited | Administrative & support | 2016 |
| BB Manco Limited | Real estate | 2023 |
| BB Trade UK Limited | Professional & scientific | 2009 |
| Bbcl Holdings Limited | Real estate | 2022 |
| BBS Security Solutions Ltd | Administrative & support | 2022 |
| Bbtv Group Ltd | Manufacturing | 2021 |
| Bbyo | Other services | 2010 |
| Bbyo (the Burroughs) Limited | Professional & scientific | 2008 |
| BC Music Education Limited | Education | 2021 |
| BCB Electrical Ltd | Construction | 2023 |
| BCC Stone Limited | Administrative & support | 2014 |
| Bcmma Ltd | Arts & recreation | 2016 |
| BD Advisors Ltd | Professional & scientific | 2026 |
| BD Creative Services Ltd | Professional & scientific | 2015 |
| BDA Management (1993) Limited | Professional & scientific | 2014 |
| BDESIGN7 Dynamics Ltd | Information & communication | 2024 |
| BDK Properties Limited | Real estate | 2025 |
| Bdmm Services Ltd | Construction | 2025 |
| BE (Colchester) Limited | Hospitality | 2018 |
| BE Happy 2020 Ltd | Transport & logistics | 2020 |
| BE in Your Element Ltd | Administrative & support | 2021 |
| BE Inspired Media Ltd | Professional & scientific | 2015 |
| BE My Bear Limited | Wholesale & retail | 2001 |
| Be-Different Consulting Limited | Professional & scientific | 2025 |
| Beach Chic Ltd | Wholesale & retail | 2025 |
| Beaches LA Limited | Other services | 2023 |
| Beacon Advisory Group Limited | Professional & scientific | 2026 |
| Beam Electrical Services Limited | Construction | 2020 |
| Beam Wellness Ltd | Financial services | 2026 |
| Beans & Bagels Ltd | Administrative & support | 2018 |
| Bear Architecture Ltd | Professional & scientific | 2022 |
| Bear Canvassing Ltd | Wholesale & retail | 2026 |
| Bear Consulting Services Limited | Information & communication | 2016 |
| Bear Grub Ltd | Hospitality | 2025 |
| Bearberry Limited | Wholesale & retail | 2024 |
| Bearclaw-Building Projects Ltd | Construction | 2026 |
| Beard Property Maintenance Limited | Construction | 2014 |
| Beardgangmembers Ltd | Wholesale & retail | 2019 |
| Bearoak Corporate Services Limited | Professional & scientific | 2010 |
| Beau Data Ltd | Administrative & support | 2023 |
| Beau Fromage Ltd | Hospitality | 2018 |
| Beaulieu Bees Ltd | Agriculture & fishing | 2025 |
| Beaulieu Chase Accountancy Management Services Ltd | Professional & scientific | 2018 |
| Beaulieu Dental Limited | Health & social care | 2017 |
| Beaulieu Estate Agents Limited | Real estate | 2025 |
| Beaulieu Estates Limited | Real estate | 2010 |
| Beaulieu Home Ltd | Real estate | 2021 |
| Beaulieu Landscapes Ltd | Other services | 2019 |
| Beaulieu Leisure Group Limited | Arts & recreation | 2024 |
| Beaulieu Park Day Nursery Limited | Health & social care | 2015 |
| Beaulieu Partners Limited | Professional & scientific | 2025 |
| Beaulieuheating Ltd | Construction | 2023 |
| Beaumont Plant Sales Limited | Administrative & support | 2024 |
| Beautify Permanent Cosmetics Limited | Other services | 2022 |
| Beauty & Health Ltd. | Health & social care | 2007 |
| Beauty LES Contours Ltd | Other services | 2025 |
| Bebatransport Limited | Extraterritorial | 2016 |
| Becentric Ltd | Other services | 2022 |
| Beckwith Contracts Limited | Transport & logistics | 2007 |
| Beda Limited | Real estate | 1995 |
| Bedford Hyde Training Limited | Education | 2019 |
| Bedford Translations Limited | Extraterritorial | 2016 |
| Bedrock Equity Limited | Financial services | 2025 |
| Bedrock Real Estate Ltd | Real estate | 2024 |
| BEE Brewery Limited | Hospitality | 2021 |
| Bee-Line (Southend) Limited | Wholesale & retail | 2002 |
| Beechinor Property Group Ltd | Real estate | 2020 |
| Beehive Electrical Limited | Manufacturing | 2009 |
| Beehive Lane Management Services Ltd | Other services | 2025 |
| Beeleigh Developments Limited | Professional & scientific | 1992 |
| Beeleigh Services Limited | Administrative & support | 2017 |
| Beepee Ltd | Arts & recreation | 2026 |
| Beesfield Homes Limited | Real estate | 2024 |
| Beexpress Group Ltd | Wholesale & retail | 2021 |
| Beexpress Logistics Ltd | Transport & logistics | 2022 |
| Beexpress Ltd | Transport & logistics | 2014 |
| BEF Services Ltd | Construction | 2015 |
| Beguiled Productions Limited | Arts & recreation | 2006 |
| Being Pamper Limited | Other services | 2023 |
| Beke Hall Trade Centre Ltd | Wholesale & retail | 2018 |
| BEL Banjo Sings Ltd | Information & communication | 2026 |
| Bel-Air Rentals Limited | Real estate | 2025 |
| Belairboys Ltd | Wholesale & retail | 2026 |
| Belbrook Limited | Real estate | 2021 |
| Belgrave Commissioning Limited | Professional & scientific | 2004 |
| Belgrave Concierge Ltd | Administrative & support | 2020 |
| Belighted Import and Export Ltd | Wholesale & retail | 2025 |
| Bell&Aero Security Ltd | Administrative & support | 2024 |
| Bella Property Services Limited | Real estate | 2016 |
| Bellabeau Ltd | Wholesale & retail | 2025 |
| Bellamy Surveying & Consultancy Services Limited | Professional & scientific | 2003 |
| Bellaprop Limited | Real estate | 2025 |
| Bellavista Apartments Limited | Households | 2023 |
| Belle Botanicals Ltd | Administrative & support | 2021 |