| Cafe Play Date Ltd | Hospitality | 2026 |
| Cain Carpentry Ltd | Construction | 2022 |
| Calais to Cape Limited | Real estate | 2019 |
| Calm Futures Hertfordshire Ltd | Health & social care | 2021 |
| Calm Futures Ltd | Health & social care | 2021 |
| Cambridge Electrical Wholesale Limited | Wholesale & retail | 1992 |
| Cambridgeshire Internet Services Limited | Professional & scientific | 1995 |
| Camelia G Ltd | Other services | 2024 |
| Cameron Claims and Surveys Ltd | Financial services | 2013 |
| Camille Hair Academy Limited | Education | 2025 |
| Camille Hair Brentwood Limited | Other services | 2021 |
| Candytuft Limited | Professional & scientific | 2025 |
| Canine DIP and Dive Maldon Ltd | Administrative & support | 2021 |
| Cannon Access Ltd | Administrative & support | 2013 |
| Capitool Business Finance Limited | Financial services | 2026 |
| Capot Ltd | Information & communication | 2006 |
| Capway Limited | Real estate | 2022 |
| Carabott & Davis Ltd | Health & social care | 2014 |
| Carbon Management Solutions Ltd | Professional & scientific | 2024 |
| Cardi Marmi Investments Limited | Real estate | 2017 |
| Care Fulfilment Limited | Financial services | 2010 |
| CARE4CARERSCLUB Ltd | Other services | 2020 |
| Carebright Limited | Wholesale & retail | 2008 |
| Cargo Asset LLP | | 2003 |
| Cargocare Global Holdings Ltd | Financial services | 2026 |
| Cargocare Global Limited | Transport & logistics | 2014 |
| Cargocare Holdings Limited | Financial services | 2026 |
| Cargocare Limited | Transport & logistics | 2010 |
| Cargocare Lines Ltd | Transport & logistics | 2017 |
| Carlisle Internet Services Limited | Professional & scientific | 1995 |
| Carlson Homes Limited | Financial services | 2017 |
| Carmelite Place Limited | Households | 1982 |
| Carters of Suffolk Limited | Manufacturing | 2012 |
| Catalogue E (UK) Ltd | Construction | 2020 |
| Catch That Card Ltd | Wholesale & retail | 2025 |
| Catering Connection Ltd | Manufacturing | 2023 |
| Cavenda Limited | Professional & scientific | 2024 |
| CB Tech Consulting Ltd | Information & communication | 2025 |
| Cbcq Ltd | Professional & scientific | 2025 |
| CC Global Holdings Limited | Financial services | 2026 |
| CCA Hospitality Ltd | Hospitality | 2025 |
| CCW Prop Limited | Real estate | 2023 |
| CDC Global Ltd | Wholesale & retail | 2024 |
| CE Property & Sons Ltd | Financial services | 2019 |
| Cellsearch Biotech Limited | Professional & scientific | 2023 |
| Central Park Capital Limited | Real estate | 2019 |
| Centurion Building and Landscapes Ltd | Administrative & support | 2025 |
| Cerro Invest International Limited | Information & communication | 2026 |
| CF Investment Group Ltd | Financial services | 2021 |
| CG Marketing Consulting Ltd | Professional & scientific | 2023 |
| Chantry Grove Management Limited | Administrative & support | 2016 |
| Chaos Monkey Technologies Ltd | Information & communication | 2025 |
| Chapel 110 LLP | | 2025 |
| Charged Electric Limited | Manufacturing | 2024 |
| Charlesworth Productions Ltd | Information & communication | 2022 |
| Charlie Charlie Windrose Limited | Financial services | 2019 |
| Chase Electrical Limited | Construction | 2022 |
| Chasefield Electrical Ltd | Construction | 2008 |
| Chasefield Holdings Limited | Real estate | 2024 |
| Chasewood Services Limited | Extraterritorial | 2006 |
| Chater Holdings Limited | Real estate | 1961 |
| Chater Land Holdings Limited | Construction | 1978 |
| Chatty Boxx C.I.C. | Health & social care | 2024 |
| Chef Hospitality Collection Limited | Hospitality | 2022 |
| Chelmer Advanced Thermostores Limited | Administrative & support | 2006 |
| Chelmer Group Limited | Administrative & support | 2024 |
| Chelmer Holdings Ltd. | Professional & scientific | 2006 |
| Chelmer Pneumatics & Compressors Limited | Manufacturing | 1987 |
| Chelmer Radio Limited | Information & communication | 2018 |
| Chelmsford Music Academy Ltd | Information & communication | 2024 |
| Chelmsford Technical Solutions Limited | Construction | 2023 |
| Chelmsford Windows & Doors Ltd | Construction | 2026 |
| Cheshire Internet Services Limited | Professional & scientific | 1995 |
| Chiltern Contracts Limited | Construction | 2008 |
| Chiltern House Properties Ltd | Real estate | 2025 |
| Chiltern Marble Group Limited | Financial services | 2017 |
| Chiltern Marble Limited | Wholesale & retail | 2008 |
| Chren Limited | Professional & scientific | 2025 |
| Chris Hampshire Design Ltd | Construction | 2019 |
| Christtechs Global Solutions Limited | Information & communication | 2019 |
| Church and Green Planning and Design Consultants Ltd | Professional & scientific | 2018 |
| Churchlow Developments Limited | Real estate | 2016 |
| Churchwell Investments Ltd | Real estate | 2003 |
| Circum Fire Engineering Limited | Construction | 2004 |
| Circum Limited | Construction | 2020 |
| Citizen Accounts Limited | Professional & scientific | 2002 |
| City Business Intelligence Solutions Limited | Information & communication | 2013 |
| City Pumps Ltd | Construction | 2009 |
| CJB Mechanical Services Ltd | Construction | 2025 |
| Cjcb Limited | Professional & scientific | 2021 |
| CJD Capital Ltd | Professional & scientific | 2023 |
| CJD Property Ltd | Real estate | 2022 |
| Cl&M Designs Ltd | Professional & scientific | 2024 |
| Clapham Properties (Brighton) Ltd | Real estate | 2002 |
| Clapham Properties (Consultancy) Limited | Professional & scientific | 2016 |
| Clarity Publishing Services Ltd | Information & communication | 2018 |
| Clearpath Construction Solutions Ltd | Information & communication | 2026 |
| Clearview Dymek Construction Limited | Construction | 2026 |
| Clearwater Maldon Limited | Administrative & support | 2023 |
| Clements Capital Limited | Real estate | 2024 |