| Canon Windows & Locks Limited | Construction | 2011 |
| Canterbury Road Management Limited | Households | 2012 |
| Canvey Islanders Limited | Real estate | 2026 |
| Canvey Talmudical Congregation Limited | Health & social care | 2021 |
| Canvey UK Estates Limited | Real estate | 2017 |
| Capital Prime Ltd | Construction | 2016 |
| Capper Property Ltd | Real estate | 2025 |
| Car/Parts Trade Limited | Wholesale & retail | 2025 |
| Carbiz Limited | Wholesale & retail | 2017 |
| Card Crusaders Ltd | Wholesale & retail | 2023 |
| Cardhood Limited | Hospitality | 2006 |
| Cardhood Services (UK) Limited | Hospitality | 2012 |
| Care 4 U Ltd | Health & social care | 2011 |
| Care CUT Ltd | Other services | 2024 |
| Care First London Ltd | Health & social care | 2020 |
| Carewood Ltd | Health & social care | 2025 |
| Carglaze Limited | Wholesale & retail | 2024 |
| Carleton Accountancy Services Limited | Professional & scientific | 2012 |
| Carmel Solutions Ltd | Real estate | 2012 |
| Carnivore FMC Limited | Wholesale & retail | 2016 |
| Carole Dunn Alpha B Limited | Wholesale & retail | 2014 |
| Carousel in the Park Limited | Arts & recreation | 2021 |
| Carpé Publicity Ltd | Professional & scientific | 2017 |
| Carr & Carr Limited | Hospitality | 2026 |
| Carrano Real Estate Ltd | Real estate | 2019 |
| Carsclinic Ltd | Wholesale & retail | 2017 |
| Carsmart Autos Limited | Wholesale & retail | 2020 |
| CAS Scaffolding Ltd | Construction | 2015 |
| Casa Lydor Ltd | Construction | 2025 |
| Cassar Enterprise Ltd | Wholesale & retail | 2024 |
| Cassop Plumbing and Co Ltd | Construction | 2019 |
| Cast Limited | Professional & scientific | 1989 |
| Castlekeeperai Ltd | Information & communication | 2025 |
| Castles Group Ltd | Financial services | 2021 |
| Catford Properties Limited | Real estate | 2013 |
| Catoz Builders Limited | Construction | 2025 |
| Catton Casks Limited | Wholesale & retail | 2019 |
| Cavendish Equipment Limited | Other services | 1967 |
| Cavus Transportation Limited | Transport & logistics | 2024 |
| Cazenove Estates Limited | Real estate | 2010 |
| CBA Zinc Design Limited | Construction | 2015 |
| CBK Electrical Supplies Limited | Wholesale & retail | 2006 |
| CBK Trading Ltd | Professional & scientific | 2024 |
| CBO Health Care Ltd | Health & social care | 2022 |
| CCJ Property Lettings Ltd | Real estate | 2012 |
| CCM and Daughters Ltd | Real estate | 2022 |
| CCS Cookout Ltd | Hospitality | 2022 |
| Ccthk Property Management Limited | Real estate | 2024 |
| CD Entry and Access Limited | Administrative & support | 2025 |
| Cdighton Cars Limited | Manufacturing | 2025 |
| CDS Internet Development Ltd | Information & communication | 2014 |
| Cecil Road (Enfield) Management Company Limited | Households | 2014 |
| Cedar Landscapes & Maintenance Ltd | Administrative & support | 2021 |
| Ceeby Management Consulting Limited | Administrative & support | 2013 |
| CEH Capital Investments Limited | Administrative & support | 2015 |
| Ceko Limited | Hospitality | 2026 |
| Celik Properties Ltd | Real estate | 2021 |
| Celin Property Limited | Real estate | 2021 |
| Cell Comm Ltd | Information & communication | 2011 |
| Cemsoy Properties Limited | Real estate | 2017 |
| Central Mining & Investment Corporation Limited(The) | Professional & scientific | 1905 |
| Central Mining Finance Limited | Financial services | 1957 |
| Centre Transport Group Ltd | Financial services | 2024 |
| Centre Transport Sales Ltd | Wholesale & retail | 2014 |
| Centre Tyres (Takeley) Ltd | Wholesale & retail | 2016 |
| Cevlik Landscaping &Gardening Ltd | Administrative & support | 2020 |
| Ceylon Gateway Ltd | Wholesale & retail | 2014 |
| CGS Football Club Limited | Arts & recreation | 2026 |
| Chageo Logistics Limited | Transport & logistics | 2019 |
| Chai Property Ltd | Real estate | 2019 |
| Chaichino Ltd | Information & communication | 2025 |
| Chambers Street Hertford Management Company Limited | Households | 2024 |
| Chandana Associates Limited | Health & social care | 2003 |
| Characterads Ltd | Arts & recreation | 2010 |
| Charis Global Services Limited | Other services | 2019 |
| Charlie’S Wildlife Photography Ltd | Administrative & support | 2021 |
| Charter Central Finance Limited | Financial services | 1952 |
| Charter Central Services Limited | Other services | 1958 |
| Charter Consolidated Holdings Limited | Professional & scientific | 2008 |
| Charter Consolidated Limited | Professional & scientific | 1964 |
| Charter Limited | Professional & scientific | 1993 |
| Charter Pension Trustee Limited | Other services | 1966 |
| Chase Accounting Limited | Professional & scientific | 2024 |
| Chase Assets Limited | Administrative & support | 2026 |
| Chase Consulting Group Limited | Financial services | 2025 |
| Chase Court Gardens Management Limited | Households | 1986 |
| Chase for Britain Limited | Professional & scientific | 2026 |
| Chase People Limited | Administrative & support | 2026 |
| Chase Tax Limited | Professional & scientific | 2025 |
| Chasewood (Enfield) NO. 2 Residents Company Limited | Households | 1986 |
| Chateau Interiors Limited | Professional & scientific | 2001 |
| Chaudri Limited | Information & communication | 2013 |
| CHC Homes Limited | Construction | 2015 |
| CHC Rentals Ltd | Real estate | 2025 |
| Check the Gate Media Limited | Information & communication | 2015 |
| Chellsea Homes Property Ltd | Real estate | 2020 |
| Cherry Green Limited | Real estate | 2021 |
| Cheshire Chippy Limited | Hospitality | 2025 |
| Cheshunt Accountants & Tax Advisors Ltd | Professional & scientific | 2014 |
| Cheshunt and Waltham Cross PCN Ltd | Health & social care | 2024 |