| Chill OUT Clubs CIC | Education | 2024 |
| Chillington Close Holdings Ltd | Real estate | 2021 |
| Chillington Close Ltd | Health & social care | 2019 |
| Chloe's Cams Ltd | Professional & scientific | 2018 |
| Chocolate Treasures Ltd | Wholesale & retail | 2018 |
| Choongh Consultancy Ltd | Professional & scientific | 2024 |
| Christar Limited | Information & communication | 2025 |
| Christie Projects Ltd | Real estate | 2018 |
| Christine Huni Ministries International | Other services | 2015 |
| Christine Thomas Limited | Professional & scientific | 2012 |
| Chrometrader Limited | Wholesale & retail | 2011 |
| Church Farm Eggs Limited | Agriculture & fishing | 1979 |
| Church Farm Group Limited | Agriculture & fishing | 2016 |
| Church ST Convenience Store Limited | Wholesale & retail | 2025 |
| Cinematic! Bringthetheatrehome Ltd | Information & communication | 2019 |
| Cinpres UK Limited | Wholesale & retail | 2014 |
| Ciszak Logistic Ltd | Transport & logistics | 2015 |
| Citnal Limited | Health & social care | 2018 |
| City Essentials Ltd | Wholesale & retail | 2023 |
| Civia Ltd | Professional & scientific | 2020 |
| CJ Rentals Ltd | Real estate | 2020 |
| CJD Logistics Ltd | Transport & logistics | 2024 |
| CJE Developments & Property Services Limited | Administrative & support | 2016 |
| CJP Tooling Limited | Wholesale & retail | 2007 |
| CJR Accommodation and Leisure Limited | Hospitality | 2025 |
| CJR Corporate and Estates Limited | Financial services | 2025 |
| CJR Plant and Machinery Limited | Manufacturing | 2025 |
| CJS Electrical & AV Ltd | Wholesale & retail | 2026 |
| CKI Holdings Limited | Financial services | 2015 |
| CKL Facades Ltd | Professional & scientific | 2023 |
| CL Training Academy Ltd | Other services | 2025 |
| Clar Decor Ltd | Construction | 2025 |
| Clarke Smith Property Management Limited | Real estate | 2025 |
| Clarke Venture Group Holdings Limited | Financial services | 2025 |
| Clarke's Cabin Transport Limited | Transport & logistics | 2018 |
| Clarke's Solutions Limited | Manufacturing | 2003 |
| Classic and Race Ltd | Administrative & support | 2019 |
| Classic Homes (Staffs) Limited | Construction | 2002 |
| Classic Woodcraft Limited | Construction | 2012 |
| Claudines Flowers Limited | Wholesale & retail | 2020 |
| Clay Home Improvements Ltd | Construction | 2026 |
| Clayton Advisory Services Limited | Information & communication | 2010 |
| Clayton Clinic Ltd | Health & social care | 2022 |
| CLC Group Limited | Construction | 2026 |
| Clean Eco Solutions Ltd | Construction | 2024 |
| Clear Blue Skies Limited | Professional & scientific | 2020 |
| Clearview Consultants Limited | Professional & scientific | 1996 |
| Clearview Upvc Ltd | Construction | 2026 |
| Clementine Design Limited | Construction | 2018 |
| Clever Duck Media Limited | Administrative & support | 2009 |
| Clever Duck Properties Limited | Real estate | 2012 |
| Clever Technology Limited | Wholesale & retail | 2010 |
| Clews Property Estates Limited | Real estate | 2018 |
| CLICK12WIN Ltd | Wholesale & retail | 2023 |
| Clinatol Investments Limited | Professional & scientific | 2021 |
| Clip Optical (Midland) Ltd | Manufacturing | 2013 |
| CLM Airconditioning Ltd | Energy | 2018 |
| CLN Social Work Solutions Ltd | Health & social care | 2018 |
| Cloos (UK) Limited | Manufacturing | 1987 |
| Cloud 9 Accounts Management Ltd | Professional & scientific | 2024 |
| Cloud 9 Soft Play Limited | Administrative & support | 2025 |
| Cloud Central Limited | Information & communication | 2023 |
| CLOUD9APPLEGROVE Ltd | Real estate | 2026 |
| CLOUD9BLACKBULL Ltd | Real estate | 2026 |
| CLOUD9HIDEAWAY Ltd | Real estate | 2026 |
| CLOUD9PARKS Ltd | Hospitality | 2025 |
| CLR Homes and Developments Limited | Construction | 2025 |
| Clyde House Product Management Consultancy Ltd | Professional & scientific | 2018 |
| CM Estate Agents Limited | Real estate | 2019 |
| CMG Aesthetics Limited | Other services | 2021 |
| CN Accountancy Services Limited | Professional & scientific | 2026 |
| CN Civil Engineering Ltd | Construction | 2026 |
| CN Convenience Store Ltd | Wholesale & retail | 2019 |
| CNG Building and Developments Limited | Real estate | 2021 |
| CNG EV Limited | Other services | 2021 |
| Co-Operative Web Limited | Information & communication | 2006 |
| Coby Capital Limited | Professional & scientific | 2026 |
| Cocoon Retreat Properties Limited | Real estate | 2021 |
| Coggers 2018 Limited | Hospitality | 2018 |
| Coilco Limited | Manufacturing | 2009 |
| Coldon Abbey Estates Limited | Real estate | 2021 |
| Coldwhere Limited | Information & communication | 2021 |
| Cole’S Auto Logistics Ltd | Transport & logistics | 2019 |
| Colgrave Carpentry Ltd | Construction | 2015 |
| Collective Building Services Ltd | Construction | 2024 |
| Colliery Practice GPF Limited | Health & social care | 2013 |
| Colluco Ltd | Information & communication | 2022 |
| Colourjoylondon Ltd | Wholesale & retail | 2024 |
| Combat Culture League Limited | Administrative & support | 2023 |
| Commercial & Residential Aluminium Ltd | Manufacturing | 2019 |
| Commercial Construction Supplies Limited | Wholesale & retail | 2017 |
| Commercial Consultancy Limited | Professional & scientific | 2017 |
| Commercial First Ltd | Real estate | 2022 |
| Commercial Household Electrical Services Limited | Construction | 2016 |
| Community Hobby and Gaming Spaces CIC | Wholesale & retail | 2023 |
| Completely Connected Limited | Construction | 2024 |
| Compspares Ltd | Information & communication | 2013 |
| Concept Elevators (Holdings) Limited | Financial services | 2011 |
| Concept Elevators (UK) Limited | Manufacturing | 2011 |
| Condensate Systems Limited | Manufacturing | 2016 |