| Bridges Court Residents Association Limited | Real estate | 1983 |
| Brinklow Properties Limited | Real estate | 2021 |
| Bristows Property Services Ltd | Transport & logistics | 2021 |
| Britannica Maintenance Limited | Construction | 2023 |
| British Wheatfields Limited | Agriculture & fishing | 1940 |
| Britscotti Medical Ltd | Information & communication | 2025 |
| Brockfield Limited | Professional & scientific | 2001 |
| Brohmon Ltd | Hospitality | 2017 |
| Broken Native Limited | Information & communication | 2022 |
| Brokor Ltd | Real estate | 2025 |
| Bromage Ltd | Professional & scientific | 2025 |
| Bromley Assets Ltd | Real estate | 2019 |
| Brookdean Limited | Other services | 2025 |
| Brooke Coaching & Development Limited | Professional & scientific | 2024 |
| Brownlow Wealth Management Ltd | Financial services | 1977 |
| Browns Builders Ltd | Construction | 2014 |
| Broxbourne Citizens Advice Bureau | Professional & scientific | 2007 |
| Brydie Taylor Ltd | Wholesale & retail | 2020 |
| BSA High Performance Ltd | Education | 2026 |
| BSA Premier Events Ltd | Administrative & support | 2024 |
| BSO Properties Limited | Real estate | 2024 |
| Btees Property Limited | Real estate | 2025 |
| Bubbaluxe Ltd | Manufacturing | 2018 |
| Buckley Taverns Limited | Hospitality | 2020 |
| Buffalo Advisory Services Ltd | Professional & scientific | 2025 |
| Building by Design Consultancy Ltd | Construction | 2024 |
| Buntingford Taxi Hub Ltd | Transport & logistics | 2024 |
| Burbage Family Butchers Limited | Wholesale & retail | 2025 |
| Burdlite Services Limited | Construction | 2022 |
| Bury Green Farm Limited | Arts & recreation | 2018 |
| Butter Hospitality Ltd | Hospitality | 2024 |
| BY Barnaby Limited | Construction | 2019 |
| BY Rosie Limited | Other services | 2024 |
| Byron & Atkinson Physiotherapy Ltd | Other services | 2020 |
| C & B Painters & Decorators Limited | Construction | 2016 |
| C O'Brien Protection Ltd | Financial services | 2022 |
| C. Melhuish Ltd | Agriculture & fishing | 2024 |
| C. U. Lighting Limited | Manufacturing | 1987 |
| C. U. Phosco Lighting Limited | Professional & scientific | 2004 |
| C.F.Vigus Limited | Agriculture & fishing | 1964 |
| C.U. Phosco Limited | Professional & scientific | 2012 |
| C19 Engineering Services Ltd | Professional & scientific | 2023 |
| C2C Group Limited | Professional & scientific | 2017 |
| Cablebear Ltd | Wholesale & retail | 2019 |
| Cafe Santiago Roastery Limited | Manufacturing | 2026 |
| Cainelli Welding and Fabrication Ltd | Professional & scientific | 2024 |
| Calculator Ltd | Public administration | 2025 |
| Caleta Group Limited | Information & communication | 2024 |
| Calico Maintenance Limited | Administrative & support | 2007 |
| Cambridge Lens Ltd | Professional & scientific | 2021 |
| Cambridge Taproom Ltd | Hospitality | 2024 |
| Campbell’S College by BG Limited | Education | 2026 |
| Cannon & Castle Ltd | Real estate | 2019 |
| Capital Bridge Properties Limited | Real estate | 2024 |
| Capital Wise Group Limited | Real estate | 2019 |
| Car Body Repairs 4 Less Ltd | Wholesale & retail | 2022 |
| Cardans Heating Ltd | Construction | 2021 |
| Cardinal Roofing Limited | Construction | 2019 |
| Cardiovascular Consulting Limited | Professional & scientific | 2009 |
| Care Group Limited | Administrative & support | 1997 |
| Careheat Ltd | Construction | 2006 |
| Cariad Associates Ltd | Other services | 2011 |
| Cariad Marketing Ltd | Other services | 2009 |
| Carte Blanche @ the Cowbarn Limited | Hospitality | 2025 |
| Carteen Limited | Manufacturing | 2025 |
| Casa LUA Ltd | Hospitality | 2015 |
| Casa Luiza Limited | Administrative & support | 2020 |
| Casa XFL Ltd | Financial services | 2015 |
| Casnou Limited | Professional & scientific | 1987 |
| Catercare Limited | Administrative & support | 2002 |
| Cbec International Ltd | Hospitality | 2019 |
| Cblp Styling Ltd | Wholesale & retail | 2026 |
| Cdot & Co Ltd | Financial services | 2020 |
| CE Soir? Ltd | Households | 2025 |
| Cedar Grange Management Limited | Households | 1980 |
| Cedars Park Farm Construction Limited | Construction | 2021 |
| Cedars Park Farm Limited | Real estate | 2020 |
| CEM Elisa Limited | Hospitality | 2025 |
| Censeo Property (Planet ST) Limited | Hospitality | 2024 |
| Censeo Property Group Ltd | Financial services | 2024 |
| Certified Sparks Ltd | Construction | 2020 |
| CGR GAS Services Ltd | Construction | 2017 |
| Chads Footwear Ltd | Manufacturing | 2019 |
| Chamberlain & Kings Estates Limited | Real estate | 2003 |
| Champion Health and Fitness Limited | Health & social care | 2018 |
| Chapcon Ltd | Construction | 2017 |
| Chapelfarm Consultants Limited | Construction | 2006 |
| Chapman Barley Limited | Real estate | 2014 |
| Chappell Solutions Limited | Professional & scientific | 2011 |
| Chapple & Halls Limited | Real estate | 1959 |
| Charleyjane's Training Academy Ltd | Education | 2023 |
| Chauncy School | Education | 2011 |
| Chelmsford Building Company Limited(The) | Construction | 1938 |
| Cherry's Property Ltd | Real estate | 2025 |
| Chicago Limited | Professional & scientific | 2006 |
| CHK Enterprise Holdings Limited | Financial services | 2020 |
| Chloe Capsey TV Ltd | Information & communication | 2020 |
| Chrometex Chemicals Ltd | Wholesale & retail | 2024 |
| Church Barns Limited | Real estate | 2018 |
| CHYLLYALPS3 Limited | Hospitality | 2025 |