| Chetland Installations Limited | Construction | 2015 |
| Cheviot Trade Limited | Wholesale & retail | 2026 |
| Chiara Clarke Property Ltd | Real estate | 2023 |
| Chicago Pizza and MIX Kebab Ltd | Hospitality | 2026 |
| Child of Gold Limited | Arts & recreation | 2024 |
| Children's Family Trust(The) | Health & social care | 1945 |
| Childrens Homes Solutions Limited | Professional & scientific | 2026 |
| Chill Air Contracts Limited | Other services | 2011 |
| Chilled OUT Campers Ltd | Wholesale & retail | 2022 |
| Chippytea Limited | Arts & recreation | 2020 |
| Chocadoobie Limited | Hospitality | 2012 |
| Chris Clark Plant Services Limited | Manufacturing | 2010 |
| Chris Dews Asset Services Limited | Transport & logistics | 2015 |
| Chris Hughes Investments Ltd | Financial services | 2021 |
| Chris Lewis Music Limited | Information & communication | 2012 |
| Chris Miller's Brilliant UK Company Ltd | Information & communication | 2024 |
| Chris Wright Childminding Limited | Health & social care | 2016 |
| Christopher's Carvery Limited | Hospitality | 2025 |
| Chronos Trade Limited | Wholesale & retail | 2026 |
| Chrysalis Pharma Limited | Wholesale & retail | 2018 |
| Chrysalis Skin Limited | Wholesale & retail | 2018 |
| Church Hill Treatment Centre Limited | Health & social care | 2002 |
| Church Street Nominees Limited | Financial services | 2023 |
| Churchill 4 X 4 Limited | Wholesale & retail | 2004 |
| Churchill Services (U.K.) Limited | Wholesale & retail | 2005 |
| Cici Express Limited | Wholesale & retail | 2025 |
| Cinema Court Management Company Ltd. | Real estate | 2006 |
| Cippa Limited | Real estate | 2019 |
| Cirrus Information Technology Limited | Other services | 2002 |
| City Farmerz Ltd | Wholesale & retail | 2024 |
| City Smoke Urban Smokehouse Limited | Hospitality | 2025 |
| City Transport Solutions Limited | Administrative & support | 1994 |
| Citypool Investments Limited | Real estate | 2020 |
| Civic Property Consultants Ltd | Real estate | 2026 |
| CJ Tree Surgeons Limited | Other services | 2014 |
| CJS Welding Limited | Other services | 2012 |
| CJW GAS Services Ltd | Construction | 2011 |
| Cjwt Limited | Financial services | 2026 |
| CK Supported Housing Limited | Hospitality | 2017 |
| CLA Developments Ltd | Construction | 2025 |
| Claire Whitehouse Learning Limited | Education | 2014 |
| Clare's Childcare Limited | Health & social care | 2015 |
| Clarity Aesthetics West Midlands Limited | Other services | 2025 |
| Clarity Stress & Trauma Ltd | Administrative & support | 2012 |
| Clark Property Refurbishment Limited | Construction | 2007 |
| Clarke Baron Associates Limited | Financial services | 2006 |
| Clarke Consultancy Services Limited | Professional & scientific | 2025 |
| Clarke Education Services Ltd | Education | 2025 |
| Clarke Flooring Limited | Administrative & support | 2016 |
| Classic Lines Design Ltd | Information & communication | 2004 |
| CLASSICAL33 Ltd | Wholesale & retail | 2022 |
| Clay 10 Limited | Arts & recreation | 2011 |
| Clay GBP Audit Limited | Professional & scientific | 2023 |
| Clay GBP Holdings Ltd | Financial services | 2023 |
| Clay GBP Limited | Professional & scientific | 2014 |
| Clay Group Investments Limited | Financial services | 2019 |
| Claybourne Trade Limited | Wholesale & retail | 2026 |
| Clcl Consulting Limited | Information & communication | 2023 |
| Clean Air Compliance Limited | Professional & scientific | 2022 |
| Cleaning Technique Limited | Administrative & support | 2012 |
| Cleanoffice.Co.Uk Ltd | Administrative & support | 2018 |
| Clear Minds Medical Ltd | Wholesale & retail | 2024 |
| Clear View Productions Ltd | Information & communication | 2019 |
| Clements and Street Limited | Manufacturing | 2005 |
| Clent Cottage Management Company Limited | Households | 2002 |
| Clever Jackie Pictures Ltd | Arts & recreation | 2019 |
| CLG Solutions Limited | Administrative & support | 2015 |
| Clicklettings Limited | Real estate | 2011 |
| Clik Properties Ltd | Real estate | 2020 |
| Climate Control Floors Ltd | Construction | 2026 |
| Clinique Aesthetics Treatments & Training Ltd | Other services | 2021 |
| Clockwise Motion Limited | Wholesale & retail | 2004 |
| Cloud Response Ltd | Information & communication | 2023 |
| Cloudvault Limited | Wholesale & retail | 2026 |
| CLR Aesthetics Ltd | Health & social care | 2020 |
| Club Coders Ltd | Education | 2026 |
| Club Scrunchies Ltd | Manufacturing | 2021 |
| Clvr Solutions Ltd | Real estate | 2023 |
| CLW Detailing Ltd | Wholesale & retail | 2024 |
| CMB Auto Repair Ltd | Wholesale & retail | 2026 |
| Cmkd Limited | Administrative & support | 2018 |
| CMR Building Contractors Ltd | Construction | 2024 |
| CMR Property Solutions (Midlands) Ltd | Construction | 2023 |
| Cntrl Limited | Other services | 2024 |
| Coach ED UK Limited | Health & social care | 2004 |
| Coach Stuart PT Ltd | Arts & recreation | 2023 |
| Coached by Steph Mills Ltd | Other services | 2023 |
| Coachellis Ltd | Other services | 2025 |
| Coalbourn Car Repairs Limited | Wholesale & retail | 2019 |
| Coconutea Limited | Extraterritorial | 2020 |
| Code Angel Ltd | Information & communication | 2012 |
| Coeur DE Lion (Construction & Development) Limited | Construction | 2004 |
| Cofton Property Services Limited | Real estate | 2019 |
| Cognito Excellentia Limited | Information & communication | 2026 |
| Cognito Music Limited | Arts & recreation | 2019 |
| Cognitor Accountancy Limited | Administrative & support | 2017 |
| Cogswell Ltd | Construction | 2011 |
| Colesbury Limited | Construction | 1994 |
| Collett Wealth Management Limited | Real estate | 2025 |
| Colonial Marketing Ltd | Financial services | 2013 |