| City View Point Commercial Ltd | Real estate | 2010 |
| City View Point Ltd | Real estate | 2010 |
| Cityspace Construction Limited | Construction | 2024 |
| Civic Recruitment Limited | Administrative & support | 2024 |
| Civilhauus Ltd | Construction | 2024 |
| Civils Direct Limited | Administrative & support | 2016 |
| CJ Hall Builders Ltd | Construction | 2021 |
| CJA Taxi Transport Limited | Transport & logistics | 2017 |
| CJC Kent Limited | Wholesale & retail | 2011 |
| CJC Mortgages Ltd | Financial services | 2025 |
| Cjja Media Limited | Administrative & support | 2021 |
| Cjja Properties Ltd | Real estate | 2022 |
| CKR Accountants Ltd | Professional & scientific | 2011 |
| CKR Directors Limited | Professional & scientific | 2002 |
| CKR Nominees Limited | Extraterritorial | 2000 |
| CKR Secretaries Limited | Professional & scientific | 2003 |
| CKR3 Limited | Real estate | 2024 |
| CKR4 Limited | Extraterritorial | 2024 |
| Clabesa Limited | Administrative & support | 2022 |
| Clad Eleven Ltd | Construction | 2019 |
| Clancey Building Developments Limited | Construction | 2022 |
| Clandon Developments Kent Ltd | Real estate | 2019 |
| Clann Sona Properties Limited | Real estate | 2018 |
| Clarence Court (Rushmore Hill) Management Company Limited | Households | 2017 |
| Clarglo 413 Limited | Real estate | 2026 |
| Clarinet and Saxophone Society of Great Britain | Arts & recreation | 1995 |
| Clarivive Medinsight Ltd | Information & communication | 2026 |
| Clarke & SON Property Ltd | Real estate | 2025 |
| Class Barbers Kent Limited | Other services | 2025 |
| Class Property Investment Limited | Real estate | 2024 |
| Claycoln Lifting Services Ltd | Administrative & support | 2016 |
| CLB Electrical Services Limited | Construction | 2011 |
| Clean in a Jiffy Ltd | Administrative & support | 2020 |
| Cleanfocal Ltd | Real estate | 2019 |
| Cleaning Motion Ltd | Administrative & support | 2020 |
| Cleanplay Ltd | Administrative & support | 2025 |
| Clear Balance Debt Recovery Ltd | Water & waste | 2026 |
| Clear Property Management (SE) Limited | Construction | 2018 |
| Clear Rock Properties Ltd | Real estate | 2022 |
| Clear Services London Limited | Administrative & support | 2026 |
| Clear Sight Consultants Ltd | Professional & scientific | 2023 |
| Clearlane Limited | Health & social care | 2021 |
| Clearpoint Business Services Ltd | Administrative & support | 2007 |
| Clearpoint Events Limited | Administrative & support | 2019 |
| Clearsift Ltd | Information & communication | 2026 |
| Clearway Environmental Services (U.K) Limited | Administrative & support | 2000 |
| Clementia Care ENG Limited | Administrative & support | 2025 |
| Clenshaw Homes Ltd | Real estate | 2025 |
| Cleopatra Enterprises Ltd | Wholesale & retail | 2024 |
| Cleverway Services Limited | Administrative & support | 2018 |
| Clifton & Co (Estate Agents) Limited | Administrative & support | 2006 |
| Clifton & Co (Hartley) Limited | Administrative & support | 2007 |
| Clifton & Co (Lettings) Limited | Administrative & support | 2012 |
| Cliftonville Court Management Company Limited | Households | 1971 |
| Clinical Partners Recruitment Ltd | Administrative & support | 2024 |
| Clinton Property Ltd | Real estate | 2022 |
| Clipped In.Tv Limited | Information & communication | 2013 |
| Clive Bilby Ltd | Professional & scientific | 2025 |
| Clive Robertson Ltd | Construction | 2017 |
| Close Protection Global Ltd | Administrative & support | 2020 |
| Cloud Invest Ltd | Real estate | 2026 |
| CLOUD65 Ltd | Information & communication | 2021 |
| Cloudbunch Limited | Information & communication | 2021 |
| Clouds Properties Limited | Real estate | 2023 |
| Cloudsaha Ltd | Information & communication | 2025 |
| CLS Global Solutions Limited | Mining & quarrying | 2014 |
| CLU Holdings Ltd | Real estate | 2024 |
| CM Construct Solutions Ltd | Construction | 2015 |
| CM Pumps Ltd | Water & waste | 2025 |
| CM Tabletop Solutions Ltd | Manufacturing | 2019 |
| CMC Consulting Engineers Ltd | Professional & scientific | 2000 |
| CMC Go Ltd | Transport & logistics | 2025 |
| CMG Consultants Limited | Health & social care | 2020 |
| CMG1 Limited | Health & social care | 2015 |
| CMM Projects LLP | | 2025 |
| CMN GAS Ltd | Professional & scientific | 2021 |
| CMP Building Ltd | Households | 2020 |
| CMP Solutions Kent Ltd | Professional & scientific | 2025 |
| CMS Elevators Ltd | Construction | 2022 |
| Cmsdriven Ltd | Information & communication | 2019 |
| CMT Equipment Limited | Wholesale & retail | 2010 |
| CMT Group Resourcing & Facilities Ltd | Administrative & support | 2025 |
| CMT Power Limited | Wholesale & retail | 2024 |
| CN Freight Ltd | Transport & logistics | 2024 |
| CN Innovative Finance Ltd | Financial services | 2015 |
| CNB GAS and Plumbing Services Limited | Construction | 2013 |
| Cnif Property Consultancy Ltd | Administrative & support | 2016 |
| Coach Hospitality Ltd | Hospitality | 2022 |
| Coastal & Agricultural Demolition Ltd | Construction | 2022 |
| Coastal Roofing and Paving Ltd | Construction | 2025 |
| Coastlands Management Company Ltd | Households | 2023 |
| Cobare Limited | Information & communication | 2025 |
| Cobham Sushi Ltd | Wholesale & retail | 2023 |
| Cocoa Venuk Ltd | Manufacturing | 2018 |
| Cocoon Children’S Therapy Ltd | Health & social care | 2018 |
| Cocoon Femme Ltd | Information & communication | 2020 |
| Codearc Recycling Ltd | Construction | 2025 |
| Coffee and Unicorns Ltd | Arts & recreation | 2014 |
| Coffee First Ltd | Hospitality | 2025 |
| Cogai Ltd | Wholesale & retail | 2020 |