| C.W. Cave (Properties) Limited | Hospitality | 2019 |
| C.W.Cave(Terrington)Limited | Agriculture & fishing | 1951 |
| CAC Developments Ltd | Construction | 2025 |
| Cadence & Candour Ltd | Professional & scientific | 2020 |
| Cafe 68 Ltd | Hospitality | 2019 |
| Cafe Garelle Ltd | Hospitality | 2025 |
| Cafe Moccha Limited | Hospitality | 2013 |
| Cafe Writers Ltd | Arts & recreation | 2006 |
| CALCIN8 Energy Limited | Manufacturing | 2021 |
| Calcutt Ceilings and Walls Limited | Construction | 2005 |
| Caledonian House & Mews Management Company Limited | Households | 2009 |
| Caley Developments Limited | Construction | 2021 |
| Caley Farms Limited | Agriculture & fishing | 1969 |
| Caley Group Ltd | Wholesale & retail | 2026 |
| Calin Bratu Ltd | Professional & scientific | 2018 |
| Calvert Brain & Fraulo Architectural Limited | Professional & scientific | 2007 |
| Calvert Brain & Fraulo Limited | Professional & scientific | 2005 |
| Cambridge Concepts Limited | Extraterritorial | 2007 |
| Cambridge Consultancy Group Ltd | Administrative & support | 2022 |
| Cambridge Education Publishing Ltd | Professional & scientific | 2017 |
| Cambridge ERP Ltd | Information & communication | 2023 |
| Cambridge Fireworks Limited | Arts & recreation | 2017 |
| Cambridge Hockey Club Limited | Arts & recreation | 2022 |
| Cambridge Technical Content Limited | Professional & scientific | 2017 |
| Cambris Cardiac Limited | Health & social care | 2021 |
| Camerons Empire Ltd | Wholesale & retail | 2025 |
| Campers 4 Couples Limited | Arts & recreation | 2021 |
| Cancer and Dementia Awareness and Support for Africa (Cadasa) Ltd | Health & social care | 2018 |
| Candy & Cream (Norfolk) Limited | Wholesale & retail | 2014 |
| Capin Ltd | Wholesale & retail | 2022 |
| Capitox Limited | Education | 2025 |
| Car Care Services (Norfolk) Limited | Wholesale & retail | 2018 |
| Caravan Services Ltd | Manufacturing | 2025 |
| Carbon Launch Systems Ltd | Professional & scientific | 2023 |
| Carbon Zero Markets Limited | Energy | 2020 |
| Cardun Limited | Construction | 2008 |
| Care Quality Group Ltd | Professional & scientific | 2025 |
| Care Star Ltd | Health & social care | 2023 |
| Careeast Limited | Hospitality | 2003 |
| Cargo Supervision and Surveying (UK) Limited | Transport & logistics | 2016 |
| Caribbean Sapphires (Ocho Rios) Ltd | Professional & scientific | 1997 |
| Carltons Solid Fuels Ltd | Administrative & support | 2017 |
| Carman Brothers Limited | Construction | 2023 |
| Carolines Body & Bath Ltd | Administrative & support | 2018 |
| Carolines Driving School Ltd | Education | 2019 |
| Caroma Store Ltd | Wholesale & retail | 2019 |
| Carousel Consultancy Limited | Administrative & support | 1991 |
| Carpet Tiles Next Day Ltd | Wholesale & retail | 2012 |
| Carrstone Limited | Health & social care | 2025 |
| Carter Rice Ltd | Financial services | 2024 |
| Carway-Roe Events Limited | Hospitality | 2016 |
| Casa Rose Ltd | Real estate | 2020 |
| Casamasa Limited | Administrative & support | 2020 |
| Case NRG Ltd | Energy | 2014 |
| Casp Holdings Limited | Financial services | 2019 |
| Caspercoast Limited | Real estate | 1977 |
| Caspianro Limited | Transport & logistics | 2008 |
| Cassiobury Estates Limited | Real estate | 2005 |
| Catapult Print and Packaging Limited | Administrative & support | 2021 |
| Cavell & Lind Limited | Health & social care | 2000 |
| Cavity Masters Ltd | Construction | 2025 |
| Cavity Wallfix Ltd | Construction | 2025 |
| Caws Property Services Ltd | Manufacturing | 2020 |
| Caymac Sports Limited | Arts & recreation | 2022 |
| CB Contracts Limited | Construction | 2022 |
| CB1 Associates Ltd | Professional & scientific | 2013 |
| CBW Solutions Limited | Professional & scientific | 2010 |
| Ccff Limited | Administrative & support | 2026 |
| CCG Farming Limited | Agriculture & fishing | 2025 |
| CE Tiling Ltd | Construction | 2019 |
| Ceat Investments Ltd | Financial services | 2019 |
| Central CAB Company Limited | Extraterritorial | 2003 |
| Central Pet Supplies Ltd | Wholesale & retail | 2024 |
| Cets Value Ltd | Information & communication | 2025 |
| CF & GF Properties Ltd | Real estate | 2024 |
| CF Contractors Ltd | Construction | 2024 |
| CF Farms Ltd | Agriculture & fishing | 2025 |
| CFM Property Services Limited | Real estate | 2021 |
| CFT Maintenance Limited | Professional & scientific | 2023 |
| CGI Group Limited | Wholesale & retail | 2024 |
| Chalk Farm Stoves Limited | Wholesale & retail | 2017 |
| Chambers Court (Dersingham) Ltd | Households | 2024 |
| Chancery Costs Consultants Limited | Professional & scientific | 2003 |
| Chandler Design Associates Limited | Information & communication | 2009 |
| Chapelfield Developments Limited | Construction | 1972 |
| Chapman Electrical (Wisbech) Limited | Construction | 2006 |
| Charcoal Grill K Lynn Ltd | Hospitality | 2026 |
| Charcoal Grill KL Ltd | Hospitality | 2025 |
| Charge Smart Ltd | Construction | 2023 |
| Charger Bay Solutions Ltd | Manufacturing | 2012 |
| Charisma Cubed Ltd | Professional & scientific | 2025 |
| Charles Lock (1963) Limited | Real estate | 1963 |
| Charliesvintagecoop Ltd | Wholesale & retail | 2026 |
| Charlock (KL) Management Company Limited | Households | 2021 |
| Charlotte Shropshire Limited | Professional & scientific | 2023 |
| Charred Macabre Ltd | Wholesale & retail | 2020 |
| Chartrent Limited | Wholesale & retail | 1992 |
| Chas D.Allflatt Limited | Construction | 1952 |
| Chatsworth Homes Wisbech Limited | Construction | 2020 |
| Checkers Ltd | Wholesale & retail | 2026 |