| Blackleaf Scaffolding Limited | Construction | 2025 |
| Blacklock Advisory Limited | Administrative & support | 2022 |
| Blackstone Hotel Group Ltd | Hospitality | 2026 |
| BLC Property Management Ltd | Real estate | 2025 |
| Bloom Mental Health & Wellbeing CIC | Education | 2025 |
| Blossoming Buddies Limited | Education | 2020 |
| BLU3 Sky Limited | Wholesale & retail | 2024 |
| Blue Barton Limited | Hospitality | 2026 |
| Blueden Limited | Hospitality | 2017 |
| Blueline Arrangements Limited | Transport & logistics | 2018 |
| Blursed Ltd | Wholesale & retail | 2018 |
| BM Property Agents Limited | Real estate | 2016 |
| BMG Surveying Ltd | Professional & scientific | 2025 |
| Boiler Repairs R US Ltd | Construction | 2014 |
| Bonjo Ltd | Hospitality | 2024 |
| Bonum-Inv Limited | Professional & scientific | 2018 |
| Boranti Ltd | Hospitality | 2014 |
| Bounty Healthcare Services Limited | Administrative & support | 2019 |
| Boxyet Ltd | Hospitality | 2013 |
| BPC Group Limited | Administrative & support | 2005 |
| BR Lite Limited | Administrative & support | 2005 |
| Brackenbury Thai Eatery Ltd | Hospitality | 2019 |
| Bradleys Childcare Limited | Health & social care | 2007 |
| Braintree Supplies Ltd | Manufacturing | 2012 |
| Branch Care Company Limited | Health & social care | 2024 |
| Branch Surveys Limited | Professional & scientific | 2022 |
| Breathing Space Wellness Limited | Other services | 2019 |
| Breon Limited | Construction | 2012 |
| Brian Warrens and Associates Limited | Information & communication | 2012 |
| Brickland Capital Ltd | Real estate | 2026 |
| Bridge Properties (Essex) Limited | Construction | 2024 |
| Brit's Pizza Limited | Hospitality | 2022 |
| Britannia Cliff Ltd | Real estate | 2024 |
| Britannia Lodge RTM Company Limited | Households | 2021 |
| British and Overseas Property Ltd | Wholesale & retail | 2007 |
| Britsafety Ltd | Other services | 2025 |
| Brodie Enterprises Ltd | Information & communication | 2020 |
| Broken Shark Ltd | Arts & recreation | 2013 |
| Brook Catford Limited | Real estate | 2014 |
| Brow Construction Ltd | Construction | 2021 |
| Brown Property Ltd | Construction | 2019 |
| Brunswick Computing Consulting Limited | Information & communication | 2019 |
| BSA IT Consulting Ltd | Other services | 2015 |
| Bscare & Recruitment Ltd | Public administration | 2024 |
| Bsgp Ltd | Households | 2024 |
| Btom Construction Limited | Construction | 2023 |
| Bubble Popping Limited | Wholesale & retail | 2026 |
| Budget Print Ltd | Other services | 2011 |
| Buildforce Contracts Ltd | Construction | 2012 |
| Buildwidus Ltd | Construction | 2023 |
| Builtbybrick Ltd | Wholesale & retail | 2026 |
| Bullpho Brands Ltd | Wholesale & retail | 2023 |
| Burnham Beer Co Ltd | Wholesale & retail | 2025 |
| Bury New Ltd | Real estate | 2018 |
| Business Payment Services Limited | Information & communication | 2022 |
| Business Protected Limited | Financial services | 2022 |
| Buzzboost Digital Ltd | Professional & scientific | 2024 |
| Bwbs Rental & Contracts Limited | Administrative & support | 2019 |
| BY D&M UK Ltd | Construction | 2015 |
| Byte Consulting Limited | Information & communication | 2017 |
| Byteshive Ltd | Professional & scientific | 2025 |
| C Chido Ltd | Health & social care | 2022 |
| C.H.D Digger Hire & Builders (Westcliff-On-Sea) Ltd. | | 1984 |
| C6L 4R Limited | Transport & logistics | 2020 |
| CAB Transmissions Limited | Manufacturing | 2014 |
| Cabellos R&R Limited | Other services | 2025 |
| Cactus Patch Productions Ltd | Information & communication | 2023 |
| Cafe Besa Ltd | Hospitality | 2026 |
| Cafe Terrace Limited | Hospitality | 2011 |
| Cafs Properties Limited | Real estate | 2019 |
| Calleo Consulting Limited | Professional & scientific | 2011 |
| Camara Dacilor Ltd | Wholesale & retail | 2020 |
| Campbells and Sons Limited | Health & social care | 2014 |
| Candy Cozy Ltd | Wholesale & retail | 2025 |
| Canon Court (Nevendon) Residents Association Limited | Households | 1988 |
| CAP247 Care Ltd | Administrative & support | 2020 |
| Caps&Gills Limited | Agriculture & fishing | 2025 |
| Car Vault (London) Ltd | Manufacturing | 2010 |
| Care in Style Limited | Other services | 2011 |
| Care Wagon Limited | Health & social care | 2023 |
| Careconnect Visits Ltd | Health & social care | 2026 |
| Career Activator Ltd | Administrative & support | 2024 |
| Careers Activators Ltd | Professional & scientific | 2022 |
| Carespace Ltd | Health & social care | 2019 |
| Caribbean Kitchen Takeaway Ltd | Hospitality | 2021 |
| Caring Cremations Ltd | Other services | 2018 |
| Carl Associates Ltd | Professional & scientific | 2024 |
| Carmar Accountancy and Bookkeeping Limited | Professional & scientific | 2020 |
| Carmar Accountancy Limited | Extraterritorial | 2020 |
| Carp Mafia Limited | Wholesale & retail | 2026 |
| Carrot Windows Doors Ltd | Construction | 2024 |
| Carson Capital Ltd | Financial services | 2020 |
| CART360 Ltd | Wholesale & retail | 2026 |
| Cassava Caterers Ltd | Hospitality | 2023 |
| Castello Luxury Baths Ltd | Manufacturing | 2019 |
| Castle Hill Finance Ltd | Financial services | 2024 |
| Castlegate (Hadleigh) RTM Company Limited | Households | 2012 |
| Catapult Cloud Ltd | Information & communication | 2025 |
| Cavetto Plastering Ltd | Construction | 2009 |
| CBW Consulting Limited | Information & communication | 2020 |