| Chisacre Heyes Limited | Professional & scientific | 2025 |
| Chisel Developments NW Ltd | Construction | 2021 |
| Choose Handmade Ltd | Wholesale & retail | 2025 |
| Chorley Concrete Limited | Construction | 2016 |
| Chorley Denture Services Limited | Health & social care | 2014 |
| Chosen Photography Limited | Professional & scientific | 2026 |
| CHR Joinery Ltd | Construction | 2024 |
| Chranoi | Professional & scientific | 2023 |
| Chris Bent Ltd | Construction | 2015 |
| Chris Bradshaw Limited | Transport & logistics | 2019 |
| Chris Care Service (UK) Limited | Health & social care | 2003 |
| Chris Jones Plastering Nefyn Ltd | Construction | 2016 |
| Chris Lloyd Agriplant Limited | Other services | 2023 |
| Chris Wallace Flooring Ltd | Construction | 2019 |
| Christian UK Family Centre | Other services | 2003 |
| Christine Ashton Ltd | Education | 2018 |
| Christmas Tree World Ltd | Wholesale & retail | 2020 |
| Christopher Inns Limited | Hospitality | 2015 |
| Chromatic Parts Limited | Manufacturing | 2023 |
| CHU & Co. Ltd | Professional & scientific | 2024 |
| Chuk Financial Ltd | Financial services | 2014 |
| Church Street Catering Ltd | Hospitality | 2016 |
| Churchfield Maintenance Ltd | Construction | 2017 |
| Churchward Logistics Limited | Transport & logistics | 2022 |
| CHY Wright Engineering Limited | Wholesale & retail | 2021 |
| Cimmas Ltd | Wholesale & retail | 2026 |
| Cintralis Ltd | Professional & scientific | 2020 |
| Circle One Golf Ltd | Manufacturing | 2026 |
| Circular Concierge Ltd | Information & communication | 2022 |
| Circular Garage Limited | Real estate | 1961 |
| City Walk Investments Limited | Real estate | 2025 |
| Civic Safety Ltd | Professional & scientific | 2026 |
| Civilero | Professional & scientific | 2023 |
| Civils & Construction Solutions Ltd | Construction | 2011 |
| CJ Garden Buildings Ltd | Manufacturing | 2021 |
| CJ Parker Projects Ltd | Arts & recreation | 2017 |
| CJ Promotions Ltd | Wholesale & retail | 2025 |
| CJ Property Group Wigan Limited | Real estate | 2024 |
| CJA Plumbing & Heating Limited | Construction | 2020 |
| Cjfs Anrich Ltd | Real estate | 2023 |
| Cjfs Properties Ltd | Construction | 2022 |
| CJH Transport Services Ltd | Transport & logistics | 2026 |
| Cjlilly Ltd | Health & social care | 2026 |
| CJM Garage Doors Limited | Manufacturing | 2002 |
| CJM Group NW Ltd | Real estate | 2016 |
| CJM Medical Locums Limited | Health & social care | 2012 |
| CJS Projects Ltd | Construction | 2026 |
| Cjsa Legacy Investments Ltd | Real estate | 2026 |
| CJT Engineering Ltd | Professional & scientific | 2026 |
| CK Building Services Ltd | Construction | 2020 |
| CK Buildings and Lettings Ltd | Construction | 2025 |
| CK Haulage (NW) Ltd | Transport & logistics | 2020 |
| CK Pro Maintenance Ltd | Professional & scientific | 2024 |
| CK Skip Hire Ltd | Administrative & support | 2020 |
| CKP Recruitment Ltd | Administrative & support | 2023 |
| CKP Training Ltd | Education | 2023 |
| CL Chambers Plumbing & Heating Limited | Construction | 2004 |
| CL Tunnelling Ltd | Construction | 2023 |
| Claire Rawlinson Ltd | Professional & scientific | 2021 |
| Clareview Ltd | Construction | 2008 |
| Clariston Properties Ltd | Real estate | 2025 |
| Clarity Insolvency Ltd | Financial services | 2026 |
| Clarke Jones Holdings Limited | Financial services | 2024 |
| Clarke Properties (NW) Limited | Construction | 2021 |
| Clarkson Financial Management Limited | Professional & scientific | 2016 |
| Claron Design Ltd | Construction | 2025 |
| Class Classes Ltd | Arts & recreation | 2019 |
| Classic 2 Modern Car Parts Ltd | Wholesale & retail | 2019 |
| Classone Properties Ltd | Real estate | 2026 |
| Classone Solutions Ltd | Transport & logistics | 2019 |
| Clavitron (Nominees) Limited | Financial services | 2000 |
| CLB Aircraft Engineer Ltd | Manufacturing | 2019 |
| Clean AS a Whistle NW Ltd | Administrative & support | 2024 |
| Clean Distribution Limited | Wholesale & retail | 2020 |
| Clean Easy Solutions Ltd | Administrative & support | 2023 |
| Cleanshine Services Limited | Administrative & support | 2025 |
| Clear Introduction Limited | Financial services | 2017 |
| Clearlink Language Services Ltd | Professional & scientific | 2026 |
| Clearview Corporate Advisory Ltd | Financial services | 2011 |
| Cleaver Consultancy Ltd | Administrative & support | 2019 |
| Clem Turton Limited | Construction | 1978 |
| Clerkenwell Investment Group Ltd | Financial services | 2025 |
| Clevedon Services Limited | Manufacturing | 2015 |
| Cleveland Heating Services Ltd | Construction | 2011 |
| Cleverstein Ltd | Extraterritorial | 2018 |
| Click Consultancy Limited | Information & communication | 2009 |
| Clientmach Ltd | Professional & scientific | 2024 |
| Clients on Hold Limited | Information & communication | 2002 |
| Cliffords Joinery Solutions Ltd | Construction | 2026 |
| Clinic 22 NW Ltd | Other services | 2022 |
| Clinical Engineering Services Ltd | Manufacturing | 2026 |
| CLM Support Limited | Health & social care | 2026 |
| Close to Home Productions CIC | Administrative & support | 2022 |
| Cloud BPM Limited | Professional & scientific | 2020 |
| CLOUD2 CAD Ltd | Information & communication | 2018 |
| Club DNA Ltd | Information & communication | 2020 |
| CM Eco Innovations Ltd | Professional & scientific | 2023 |
| CM Electrical NW Ltd | Construction | 2026 |
| CM Health & Fitness Ltd | Arts & recreation | 2013 |
| CM Roofing (Wigan) Ltd | Construction | 2022 |