| Burt Baits and Tackle Ltd | Wholesale & retail | 2020 |
| Burton Construction (NO.1) Ltd | Construction | 2025 |
| Burton Construction Ltd | Construction | 2025 |
| Burton Solar Solutions (Wholesale) Ltd | Construction | 2025 |
| Burton Solar Solutions Ltd | Construction | 2025 |
| Burtonise Ltd | Information & communication | 2025 |
| Burywood Developments Ltd | Administrative & support | 2019 |
| Butler & Francis Developments Limited | Construction | 2024 |
| Butler West Electrical Services Limited | Construction | 2010 |
| Butler West Solar Ltd | Construction | 2024 |
| BY Jamie London Ltd | Other services | 2026 |
| C & C Plant and Transport Consultancy Limited | Professional & scientific | 2009 |
| C Esports Ltd | Administrative & support | 2020 |
| C G Rigging Limited | Construction | 2012 |
| C&B Windows Ltd | Construction | 2024 |
| C&O SLS Limited | Health & social care | 2015 |
| C3 Weddings Ltd | Information & communication | 2018 |
| Cable IT Solutions Ltd | Information & communication | 2015 |
| Cadena Developments Limited | Real estate | 2005 |
| Caesar Performance Ltd | Wholesale & retail | 2024 |
| Calleja Consulting Limited | Professional & scientific | 2005 |
| Cambridge Centre of Performance & Excellence Limited | Education | 2014 |
| Camford Sutton Associates Ltd | Administrative & support | 2012 |
| Campbell Associates Limited | Professional & scientific | 1999 |
| CAN Associates Limited | Other services | 2002 |
| Canfield Farming Limited | Agriculture & fishing | 2015 |
| Canfield Garage Limited | Wholesale & retail | 2017 |
| Canfield House Limited | Real estate | 2009 |
| Canfield Service Centre Limited | Wholesale & retail | 2017 |
| Cannon Architectural Design Ltd | Professional & scientific | 2018 |
| Cannon Homes Ltd | Construction | 2018 |
| CAP Services International Limited | Administrative & support | 2011 |
| Capital Building Limited | Construction | 2018 |
| Capon Property & Building Services Ltd | Construction | 2014 |
| Captive Broadcast Limited | Information & communication | 2003 |
| Capture Inventory Ltd | Households | 2020 |
| Car Wash Consultancy Services Ltd | Professional & scientific | 2025 |
| Cardiohaem Ltd | Health & social care | 2019 |
| Carl Hopkins Garage Services Limited | Wholesale & retail | 2004 |
| Cartea Limited | Professional & scientific | 2012 |
| Cartel (Brothers) Limited | Administrative & support | 2024 |
| Caruso Consulting Services Ltd | Professional & scientific | 2020 |
| Caruso Global Consulting Ltd | Professional & scientific | 2019 |
| Caruso Group Ltd | Extraterritorial | 2020 |
| Carvella Rooms Aesthetics Ltd | Health & social care | 2026 |
| Casa Dunmow Ltd | Hospitality | 2023 |
| Cashtec Designs Limited | Professional & scientific | 1994 |
| Castleside Construction Limited | Construction | 2025 |
| Catalyst Image Solutions Limited | Professional & scientific | 2012 |
| Catherine Limited | Other services | 2013 |
| Causton East Consulting Limited | Professional & scientific | 2018 |
| Cave Agency Ltd | Professional & scientific | 2026 |
| Cavendish Engineers Ltd | Professional & scientific | 1995 |
| CC Stone Ltd | Manufacturing | 2024 |
| CCS (Satcom) Limited | Manufacturing | 2005 |
| CDB Plumbing and Heating Ltd | Construction | 2020 |
| CE Consultancy 1869 Limited | Professional & scientific | 2015 |
| CE Secretarial 1869 Limited | Administrative & support | 2015 |
| Ceau Ltd | Wholesale & retail | 2021 |
| Celare Consulting Ltd | Professional & scientific | 2025 |
| Cenco Ltd | Water & waste | 2020 |
| Centrail Limited | Real estate | 2003 |
| Century Tower (SPV) Ltd | Real estate | 2022 |
| Certain Change Limited | Education | 2002 |
| CF Welding Services Ltd | Professional & scientific | 2022 |
| Chamberlain Brown LLP | | 2012 |
| Champions of Media Ltd | Administrative & support | 2017 |
| Champions of Mind Coaching Academy Ltd | Education | 2019 |
| Champions of Mind Ltd | Professional & scientific | 2017 |
| Chapel Lawns (Felsted) Management Company Limited | Households | 2007 |
| Chapman Property Lettings Ltd | Real estate | 2025 |
| Charlestons Independent Inventory Services Limited | Administrative & support | 2018 |
| Charlotte Partners Limited | Financial services | 2011 |
| Charlton Mews Management Co Limited | Households | 2006 |
| Chefwebb Limited | Hospitality | 2021 |
| Chelmsford Dance Centre Limited | Arts & recreation | 2003 |
| Cheryl Hole Ltd | Arts & recreation | 2019 |
| Chesterfield Finance Limited | Financial services | 2022 |
| Chevres Limited | Financial services | 2012 |
| Chiara PMU Limited | Other services | 2022 |
| Chic Charm Beauty Ltd | Other services | 2024 |
| Chills Bodyworks Ltd | Wholesale & retail | 2015 |
| Chimera Agencies Limited | Transport & logistics | 1990 |
| Chingford Motor Services Limited | Wholesale & retail | 1994 |
| Chippendale Properties LLP | | 2010 |
| Chophouse Haverhill Ltd | Other services | 2026 |
| Chophouse Lakenheath Ltd | Other services | 2022 |
| Chorus Holdings Limited | Financial services | 2020 |
| Chosen Vessel Ltd | Wholesale & retail | 2025 |
| Chptr;One Ltd | Manufacturing | 2026 |
| Christmas Cottages (Great Dunmow) Property Management Limited | Households | 2013 |
| Christopher James London Ltd | Other services | 2016 |
| Church Farm Barns Snailwell Management Limited | Households | 2025 |
| Ciaran Williams Properties Limited | Real estate | 2024 |
| Cidm Ltd | Professional & scientific | 2020 |
| CJB (Motor Services) Limited | Wholesale & retail | 1997 |
| CJC Management Consultancy Ltd | Professional & scientific | 2018 |
| CJG Systems Limited | Information & communication | 2022 |
| CJK Export Services Limited | Manufacturing | 2010 |
| Clarent Advisory Ltd | Professional & scientific | 2026 |