| Chergoona Limited | Hospitality | 2024 |
| Chicago Solutions Ltd | Construction | 2020 |
| Chicago Transport Ltd | Construction | 2020 |
| Chicken Land B66 Ltd | Hospitality | 2018 |
| Chinook Couriers Ltd | Transport & logistics | 2020 |
| Chix Chickens WM Ltd | Hospitality | 2024 |
| Chohan Homes Limited | Real estate | 2020 |
| Choice First Health and Home Care Ltd | Health & social care | 2013 |
| Cholia Properties Limited | Real estate | 2025 |
| Choman Supermarket Ltd | Wholesale & retail | 2026 |
| Chozen Vessel's Ltd. | Wholesale & retail | 2020 |
| Chrisandarthurs House Ltd | Wholesale & retail | 2023 |
| Chrysalis Living Ltd | Health & social care | 2019 |
| Church Street Group Limited | Financial services | 2023 |
| Chxpz Ltd | Manufacturing | 2018 |
| Ciber Software Ltd | Construction | 2020 |
| Cinderella Golf CIC | Manufacturing | 2025 |
| Cipher Computers Ltd | Construction | 2020 |
| Circle Tri-Angle Technology Limited | Information & communication | 2024 |
| CIS Enterprises (Midlands) Limited | Professional & scientific | 2015 |
| CIS Investments (Midlands) Ltd | Real estate | 2023 |
| CIS Properties (Midlands) Ltd | Real estate | 2021 |
| Citrion Limited | Wholesale & retail | 2021 |
| City Bargain Pound Plus Limited | Construction | 2014 |
| City Computer Systems Ltd | Wholesale & retail | 2007 |
| City Pro Services Ltd | Information & communication | 2018 |
| City Store Two Limited | Wholesale & retail | 2025 |
| CJL Music Ltd | Health & social care | 2025 |
| CK Fade Ltd | Other services | 2026 |
| Cladding Group Ltd | Construction | 2022 |
| Cladding Sheets & Profiles Limited | Extraterritorial | 1976 |
| Cladup Design Ltd | Professional & scientific | 2017 |
| Clarendon Automotive Performance Ltd | Wholesale & retail | 2025 |
| Clarendon Glazing Ltd | Manufacturing | 2022 |
| Clarendon IT Solutions Ltd | Information & communication | 2025 |
| Clarendon Studio Ltd | Information & communication | 2025 |
| Clark and Harvey Limited | Extraterritorial | 2015 |
| Classic Barbers Club Limited | Other services | 2025 |
| Clean ALL Professional Services Ltd | Administrative & support | 2025 |
| Clean Cloud AI Ltd | Information & communication | 2025 |
| Clean CUT Design & Build Ltd | Construction | 2018 |
| Cleaning Agents and Services Ltd | Administrative & support | 2023 |
| Cleaning Dept Ltd | Manufacturing | 2026 |
| Cleanstal Ltd | Financial services | 2026 |
| Cleanu Ltd | Administrative & support | 2026 |
| Clear Distro Limited | Wholesale & retail | 2023 |
| Clear Group Services Ltd | Wholesale & retail | 2026 |
| Clear KKS Limited | Professional & scientific | 2025 |
| Clear Vision Cape Ltd | Wholesale & retail | 2019 |
| Clearhub Ltd | Health & social care | 2019 |
| Clearlake Projects Ltd | Construction | 2020 |
| Clfd Ltd | Real estate | 2023 |
| Click Flooring Limited | Construction | 2012 |
| Click Flooring Online Ltd | Construction | 2020 |
| Click Flooring Supplies Ltd | Construction | 2021 |
| Clinink Medical Ltd | Administrative & support | 2026 |
| Cloudtechhills IT Ltd | Information & communication | 2025 |
| Cloudy Comforts Limited | Real estate | 2024 |
| Cluston Services Ltd | Manufacturing | 2018 |
| CMB Network Ltd | Construction | 2022 |
| Cmdrealestate Ltd | Real estate | 2019 |
| CND Cleaning Ltd | Administrative & support | 2025 |
| CNN Software Ltd | Information & communication | 2020 |
| Coach Forward & Associates Limited | Professional & scientific | 2024 |
| Coachmate Ltd | Transport & logistics | 2026 |
| Cocogymbo Ltd | Wholesale & retail | 2022 |
| COD N Donner Chippy Limited | Hospitality | 2026 |
| Codec Computers Ltd | Construction | 2020 |
| Codec Digital Ltd | Construction | 2020 |
| Codewave Services Ltd | Information & communication | 2025 |
| Cody's Italian Shop Ltd | Hospitality | 2021 |
| Cogans Cosy Homes Ltd | Real estate | 2026 |
| Cognisys Solutions Limited | Information & communication | 2025 |
| Cognitive Toolbox Community Interest Company | Education | 2024 |
| College of Science Engineering and Management Ltd | Education | 2024 |
| Collyer and Mcbride Funeral Directors Ltd | Extraterritorial | 2024 |
| Colombia Picada MIX Ltd | Hospitality | 2020 |
| Colt Services Ltd | Construction | 2020 |
| Comfort Home Housing Association CIC | Health & social care | 2020 |
| Community Action Project | Health & social care | 1998 |
| Community Connect Foundation | Education | 1999 |
| Company Services (GHK) Limited | Professional & scientific | 2013 |
| Complex Foods Limited | Hospitality | 2025 |
| Compnet Solutions Ltd | Information & communication | 2016 |
| Con-Struct Ltd | Construction | 2009 |
| Conifers Day Nursery Limited | Other services | 2017 |
| Consulteam Services Ltd | Transport & logistics | 2019 |
| Continental Pizza BBQ Ltd | Hospitality | 2025 |
| CONTROLS4U Limited | Manufacturing | 2014 |
| Conwon Ltd | Wholesale & retail | 2021 |
| Cookie JAR Investments Ltd | Real estate | 2020 |
| Cordoba Ventures Ltd | Wholesale & retail | 2021 |
| Coretrans Solutions Limited | Transport & logistics | 2025 |
| Cornea Brothers Limited | Administrative & support | 2017 |
| Cornel Traders Limited | Wholesale & retail | 2026 |
| Corning Solutions Ltd | Construction | 2020 |
| Corrugated Sheets & Cladding Limited | Extraterritorial | 1982 |
| Cosy Homes for YOU Limited | Real estate | 2025 |
| Coton Care Limited | Health & social care | 2002 |
| Courier Express U.K. Ltd | Transport & logistics | 2024 |