| Bumblebnb Ltd | Real estate | 2019 |
| Burcea Haulage Limited | Transport & logistics | 2016 |
| Busibookkeepers Ltd | Professional & scientific | 2021 |
| Business Opportunities for the Physically Handicapped Limited | Administrative & support | 2011 |
| Business Shows Limited | Information & communication | 2012 |
| Business Workspace Solutions Ltd | Extraterritorial | 2018 |
| Butterfly Home Cleaning Limited | Administrative & support | 2021 |
| Buudby Estates Ltd | Real estate | 2025 |
| Buy From China NOW Limited | Extraterritorial | 2020 |
| Byfield Consultancy Limited | Other services | 2006 |
| Bygrace Catering Solution Ltd | Hospitality | 2022 |
| Bygrace Ltd | Construction | 2019 |
| C & Z Recovery Limited | Transport & logistics | 2022 |
| C and C Engineering and Fleet Services Ltd | Wholesale & retail | 2023 |
| C I G Technical Solutions Ltd | Administrative & support | 2023 |
| C Young Property Services Ltd | Real estate | 2025 |
| C&E Investment Group Limited | Financial services | 2025 |
| C.J.M. Limited | Construction | 2001 |
| C.J.S Carpentry & Joinery Solutions Limited | Construction | 2017 |
| CAD on Track Limited | Information & communication | 2014 |
| Caelira Systems Ltd | Manufacturing | 2025 |
| Café Ermac Limited | Hospitality | 2024 |
| CAI Watson Limited | Arts & recreation | 2023 |
| Caine Road Consulting Ltd | Administrative & support | 2023 |
| Cairns Keenan Holdings Ltd | Real estate | 2026 |
| Cakes N' Desserts Limited | Manufacturing | 2020 |
| Calmac Services Limited | Professional & scientific | 2006 |
| Calmcalls Ltd | Information & communication | 2026 |
| Camellia Theatre Arts Limited | Education | 2017 |
| Campbell Haulage Ltd | Transport & logistics | 2007 |
| Candy Trading Limited | Wholesale & retail | 2007 |
| Canvey Bay Trading Company Ltd | Wholesale & retail | 2022 |
| Canvey Beds Ltd | Wholesale & retail | 2021 |
| Canvey Claims Consultants Limited | Financial services | 2024 |
| Canvey Cleaners Ltd | Households | 2015 |
| Canvey Commercial Laundry Limited | Other services | 2012 |
| Canvey Competitions Limited | Arts & recreation | 2025 |
| Canvey Concrete Pumping Limited | Construction | 2005 |
| Canvey Construction Ltd | Construction | 2025 |
| Canvey Corporation Ltd | Hospitality | 2023 |
| Canvey Cycles Ltd | Wholesale & retail | 2019 |
| Canvey Drywall Limited | Construction | 2021 |
| Canvey Estates Ltd | Real estate | 2019 |
| Canvey Express Shuttle Ltd | Transport & logistics | 2021 |
| Canvey Hand Car Wash Ltd | Other services | 2016 |
| Canvey Houses Ltd | Real estate | 2023 |
| Canvey Island Bingo Ltd | Hospitality | 2024 |
| Canvey Island Football Club Limited | Arts & recreation | 2002 |
| Canvey Jewish Trust Ltd | Hospitality | 2019 |
| Canvey Kehilla Ltd | Other services | 2022 |
| Canvey Kids Ltd | Health & social care | 2018 |
| Canvey MOT & Service Centre Ltd | Wholesale & retail | 2013 |
| Canvey News Ltd | Wholesale & retail | 2023 |
| Canvey Project Management Limited | Real estate | 2026 |
| Canvey Properties Ltd | Real estate | 2017 |
| Canvey Property Ltd | Real estate | 2021 |
| Canvey Self Storage Limited | Other services | 2016 |
| Canvey Subs Ltd | Hospitality | 2016 |
| Canvey Supply Company Limited | Wholesale & retail | 1919 |
| Canvey Tandoori Ltd | Hospitality | 2025 |
| Canvey Wharf Company Limited(The) | Wholesale & retail | 1928 |
| Canveyfornia Consulting Limited | Administrative & support | 2013 |
| CAO Parcel Services Ltd | Transport & logistics | 2026 |
| Capital Insulations Ltd | Construction | 2021 |
| Capital Property Resolutions Limited | Construction | 2011 |
| Car Power Limited | Wholesale & retail | 2024 |
| Caractacus Spirits Ltd | Manufacturing | 2024 |
| Carbon Zero Limited | Professional & scientific | 2025 |
| Career Forge Solutions Limited | Other services | 2024 |
| Careplus Residential & Respite Ltd | Administrative & support | 2022 |
| Caron Heating & Plumbing Engineers Limited | | 1988 |
| Carringtons Tree Surgery Limited | Administrative & support | 2022 |
| Casa Invertida Limited | Information & communication | 2021 |
| Casa Seabrook Limited | Real estate | 2026 |
| Castle Optical Services Ltd | Health & social care | 1998 |
| Castle Point Care Limited | Administrative & support | 2025 |
| Castle Point Iron Works Ltd | Manufacturing | 2020 |
| Castle Point Lettings Limited | Real estate | 2014 |
| Castle Point Motors Limited | Wholesale & retail | 2006 |
| Catherine Estates Ltd | Real estate | 2022 |
| Cato Analytics Limited | Information & communication | 2017 |
| Causon Building Assets Ltd | Real estate | 2018 |
| Cavity Closure Ltd | Construction | 2013 |
| Cazaar Ltd | Wholesale & retail | 2021 |
| CC Box Solutions Limited | Construction | 2024 |
| CC International Ltd | Information & communication | 2023 |
| CC Property Connections Group Ltd | Real estate | 2025 |
| CCG Groundworks Ltd | Construction | 2019 |
| Cdogsgarmz Ltd | Wholesale & retail | 2026 |
| Cedar Metals Limited | Professional & scientific | 2004 |
| Cedar Utility Limited | Construction | 2021 |
| Cedartech Energy Ltd | Energy | 2023 |
| Cedartech Ltd | Energy | 2020 |
| Cee.J.Cee Limited | Real estate | 2012 |
| Celtic Electricals Essex Limited | Construction | 2014 |
| Central 8 Management Limited | Professional & scientific | 2017 |
| Centralised Management Ltd | Arts & recreation | 2017 |
| CFC Property Maintenance Ltd | Other services | 2022 |
| CHA Construction Ltd | Construction | 2018 |
| CHA Projects Limited | Extraterritorial | 2022 |