| Bright Reach Limited | Professional & scientific | 2024 |
| Bright Thinking Marketing Solutions Ltd | Professional & scientific | 2022 |
| Brighton Pride Community Interest Company | Arts & recreation | 2013 |
| Brightsure Electrical Limited | Construction | 2016 |
| Brightsure Limited | Construction | 2016 |
| Brightwell Motor Company Ltd | Wholesale & retail | 2020 |
| Brik Recruitment Limited | Other services | 2019 |
| Brilliant Industries Limited | Wholesale & retail | 2008 |
| Brit Food 2 U Limited | Hospitality | 2025 |
| British Acupuncture Association and Register(The) | Health & social care | 1963 |
| British Tennis Coaches Association Limited | Other services | 2001 |
| Brittains (Furnishers) Limited | Real estate | 1940 |
| Broadway Developments Limited | Other services | 2009 |
| Brockfield Trading Company Limited | Administrative & support | 1995 |
| Broomfield Athletics Ltd | Education | 2020 |
| Broomhall Fabrications Limited | Manufacturing | 1999 |
| Bros Healthcare Solutions Ltd | Public administration | 2023 |
| Brownsleigh Limited | Construction | 2025 |
| BRUSH.71 Ltd | Other services | 2023 |
| Bryan Builders (Rayleigh) Ltd | Construction | 2020 |
| Bschip CIC | Other services | 2024 |
| Bucks Training Academy Limited | Administrative & support | 2019 |
| Build (Skinners Lane ) Ltd | Construction | 2024 |
| Build Partnerships Limited | Construction | 2015 |
| Build UP Investments Ltd | Real estate | 2024 |
| Building by Recommendation Ltd | Construction | 2025 |
| Bulk Buying Limited | Wholesale & retail | 2015 |
| Burke and Hare Creative Limited | Arts & recreation | 2018 |
| Burning Desire Installations Ltd | Construction | 2019 |
| Buy Back IT Ltd | Wholesale & retail | 2014 |
| BW Brickwork Ltd | Construction | 2020 |
| BWC Builders Ltd | Construction | 2023 |
| BWR Construction Limited | Construction | 2019 |
| Byfords Traditional Fresh Foods Limited | Real estate | 1998 |
| C Cooper Property Ltd | Real estate | 2026 |
| C I S Services Limited | Construction | 2002 |
| C P Autos Essex Ltd | Wholesale & retail | 2025 |
| C Rogers Consulting Limited | Information & communication | 2014 |
| C Williams Services Limited | Construction | 2016 |
| C&W Interiors Limited | Manufacturing | 2022 |
| C1 Coaching Ltd | Education | 2025 |
| Cactus Trading Company Ltd | Wholesale & retail | 2023 |
| CAD Contractor Ltd | Professional & scientific | 2019 |
| Cafe 206 Limited | Hospitality | 2017 |
| Cafe 401 Ltd | Hospitality | 2024 |
| Cafe Patois Limited | Hospitality | 2025 |
| Cailex Limited | Professional & scientific | 2016 |
| Calder Services Limited | Water & waste | 2005 |
| Camera One Rental Limited | Administrative & support | 2023 |
| Capital Building Care Limited | Administrative & support | 2026 |
| Capital Cooling Air Conditioning Ltd | Construction | 2022 |
| Capital Financial (UK) Limited | Financial services | 2004 |
| Capri and Gigi Collective Limited | Wholesale & retail | 2026 |
| Caprice Coinamatic Limited | Real estate | 1966 |
| Car-Nect 4 Limited | Real estate | 2006 |
| Car-Nect Auto Group Limited | Wholesale & retail | 1995 |
| Car-Nect Auto Ltd | Wholesale & retail | 2024 |
| Card Culture Ltd | Wholesale & retail | 2021 |
| Carly Salter Interiors Ltd | Other services | 2017 |
| Carnot Close Management Company Ltd | Households | 2009 |
| Carpenters Trade Cars Ltd | Wholesale & retail | 2020 |
| Carrington Recruitment Solutions Ltd | Administrative & support | 2016 |
| Carrzar Limited | Wholesale & retail | 2023 |
| Cars Under Limited | Wholesale & retail | 2019 |
| Carters Estates Essex Ltd | Real estate | 2026 |
| Castlemead Management Limited | Other services | 1994 |
| Cat Casa Ltd | Wholesale & retail | 2025 |
| Causeway Country Sports Ltd | Manufacturing | 2021 |
| Caxton Street North Ltd | Real estate | 2014 |
| CBU UK Ltd | Construction | 2026 |
| CC Cabling Ltd | Construction | 2023 |
| CC Mastic Ltd | Construction | 2024 |
| CC117 Limited | Manufacturing | 2017 |
| CCL Media Partners Limited | Extraterritorial | 2025 |
| Celestial Church of Christ Rehoboth Parish | Other services | 2018 |
| Centrechild House Ltd | Health & social care | 2022 |
| CEV Distribution Ltd | Wholesale & retail | 2026 |
| CF IT Management Limited | Information & communication | 2005 |
| CGI Friday Limited | Professional & scientific | 2019 |
| Cguinane Limited | Financial services | 2021 |
| Chameleon Colour Contractors Limited | Construction | 2010 |
| Changes Promotions Limited | Education | 2006 |
| Changing Spaces Kent Ltd | Construction | 2019 |
| Chantree Solutions Limited | Professional & scientific | 2025 |
| Charfleets Promotions Limited | Real estate | 1992 |
| Charles Anderson Associates Limited | Financial services | 2008 |
| Charlotte Elizabeth Ltd | Professional & scientific | 2015 |
| Charlton Alderman Demolition Ltd | Construction | 2017 |
| Charlton Farm Limited | Administrative & support | 2004 |
| Chase END Residents Association Limited | Households | 2002 |
| Chelmsford Plastering and Home Improvements Ltd | Construction | 2019 |
| Chelmsford Plastic Warehouse Limited | Wholesale & retail | 2003 |
| Cherrydown Fire Protection Limited | Construction | 2022 |
| Chestnut Cottages Management Company Limited | Households | 1991 |
| Chosen Recruitment Services Ltd | Administrative & support | 2020 |
| Christopher Peacock Home Limited | Manufacturing | 2014 |
| Christopher Peacock Home London Limited | Manufacturing | 2014 |
| Church Kendall Ltd | Construction | 2015 |
| CIA Security Limited | Administrative & support | 2014 |
| Ciao Bella! Nails Limited | Other services | 2013 |