| Burgess Field (Chelmsford) Management Company Limited | Households | 1986 |
| Burlington Road (Tottenham) Management Company Limited | Households | 1971 |
| Burney (Harwich) Ltd | Real estate | 2021 |
| Burney (Hornchurch) Limited | Real estate | 2012 |
| Burney (Ipswich) Ltd | Real estate | 2021 |
| Burney Drive Management Company Limited | Households | 1983 |
| Burney Estates Development Ltd | Real estate | 2017 |
| Burney Estates Midlands Limited | Real estate | 2013 |
| Burney New Developments Ltd | Other services | 2014 |
| Buslogistics Limited | Transport & logistics | 2025 |
| Busy Bees Christian Pre-School Nursery Limited | Health & social care | 2019 |
| Butavasy Ltd | Transport & logistics | 2024 |
| Buybox 17 Ltd | Information & communication | 2022 |
| C K M Construction Ltd | Construction | 2026 |
| C&A Accounting & Consultancy Ltd | Professional & scientific | 2022 |
| C&G Canvassing Ltd | Wholesale & retail | 2026 |
| Calden Consultancy Services Limited | Administrative & support | 2015 |
| Cambridge IF Analytica Limited | Education | 2014 |
| Cambridge International Financial Advisory Ltd | Professional & scientific | 2018 |
| Cameron Quality Management Ltd | Wholesale & retail | 2016 |
| Cameron Quality Services Limited | Administrative & support | 2015 |
| Camversation Limited | Extraterritorial | 2012 |
| Candoo Food Ltd | Hospitality | 2026 |
| Candoo Homes Ltd | Real estate | 2023 |
| Candoo Industrial Maintenance Limited | Manufacturing | 2015 |
| Capital Skip Hire Ltd | Transport & logistics | 2026 |
| Capricorn LEO Properties Limited | Real estate | 2025 |
| Capsulation PPS Ltd | Professional & scientific | 2012 |
| Car Wizz Ltd | Wholesale & retail | 2023 |
| Cardastrophe TCG Limited | Wholesale & retail | 2025 |
| Care BEE Ltd | Health & social care | 2023 |
| Carmine Ciao & Co Ltd | Wholesale & retail | 2018 |
| Carpet Delight Ltd | Wholesale & retail | 2020 |
| Carrostein Ltd | Information & communication | 2018 |
| Carter Services Limited | Households | 2019 |
| CAS Psychological Services Ltd | Health & social care | 2021 |
| Cassie Puscasu Limited | Professional & scientific | 2024 |
| Cat Drylining Ltd | Construction | 2020 |
| CATALEYA07 Ltd | Transport & logistics | 2024 |
| CAV Capital Ltd | Professional & scientific | 2023 |
| Caxton Security Group LLP | | 2013 |
| Caxton Security Limited | Administrative & support | 2013 |
| CDA Team Transport Ltd | Transport & logistics | 2019 |
| CDM Carpentry(Uk) Ltd | Construction | 2015 |
| Celebrateshop Ltd | Wholesale & retail | 2024 |
| Central Freeholds Limited | Real estate | 2004 |
| Central House RTM Company Ltd | Households | 2024 |
| Ceres Assets Ltd | Wholesale & retail | 2018 |
| Ch&M Limited | Construction | 2012 |
| Chadwell Heath Veterinary Practice Limited | Real estate | 2002 |
| Chai Yeah Ltd | Hospitality | 2025 |
| Chana Asset Management Ltd | Real estate | 2018 |
| Chana Consolidated Limited | Real estate | 2019 |
| Chana Design and Build Ltd | Construction | 2025 |
| Chana Hospitality Ltd | Wholesale & retail | 2020 |
| Chana Medical Services Ltd | Construction | 2008 |
| Chandrakaanthan Fashions Limited | Wholesale & retail | 2015 |
| Chane Investments Limited | Information & communication | 1999 |
| Change Telecoms Ltd | Wholesale & retail | 2009 |
| Chapel Hill Studio Ltd | Other services | 2018 |
| Chari Fixing Limited | Construction | 2016 |
| Charleston Darwin Limited | Financial services | 2025 |
| Charlton Care Group Limited | Health & social care | 2009 |
| Charlton Legal Consultancy Limited | Professional & scientific | 2023 |
| Chatha & Sons Ltd | Real estate | 2026 |
| Chhabra Ltd. | Wholesale & retail | 2017 |
| Chicken Run Productions Limited | Manufacturing | 2025 |
| Chiggle Ltd | Professional & scientific | 2015 |
| Chigwell Broker Services Limited | Financial services | 2025 |
| Chigwell Building Services Ltd | Construction | 2020 |
| Chigwell Burnt House Properties Limited | Professional & scientific | 1988 |
| Chigwell Butcher Ltd | Wholesale & retail | 2025 |
| Chigwell Catering Ltd | Hospitality | 2026 |
| Chigwell Construction Services Limited | Construction | 2020 |
| Chigwell Garden Maintenance Ltd | Administrative & support | 2025 |
| Chigwell Golf Club Limited(The) | Arts & recreation | 1924 |
| Chigwell Interiors Ltd | Construction | 2019 |
| Chigwell Kebab Ltd | Hospitality | 2019 |
| Chigwell Locksmith Limited | Other services | 2020 |
| Chigwell Medical Services Limited | Other services | 2004 |
| Chigwell Muslims Association | Other services | 2025 |
| Chigwell Rise Ltd | Real estate | 2024 |
| Chigwell School | Education | 2006 |
| Chigwell Tandoori Limited | Hospitality | 2016 |
| CHIKO1970 Limited | Construction | 2016 |
| Chima and Chima Limited | Real estate | 2018 |
| Chimbley Estates Ltd | Real estate | 2023 |
| Chloe JAY Studios Ltd | Administrative & support | 2025 |
| Chokoy Ltd | Construction | 2012 |
| Cholgain Construction Ltd | Other services | 2025 |
| Chris Poulter Limited | Construction | 2006 |
| Chris Stone Ltd | Construction | 2014 |
| Cibas Ltd | Construction | 2010 |
| Cinnamon Space Ltd | Professional & scientific | 2020 |
| City & Country Shutters Limited | Other services | 2018 |
| City Chiropody and Podiatry Limited | Health & social care | 2020 |
| Cityfitlondon Ltd | Real estate | 2015 |
| Cityscape Properties (CSS) Limited | Real estate | 2025 |
| CIV (287 High Street) Ltd | Construction | 2024 |
| Civils Investment Limited | Real estate | 2015 |