| Cheshire Grab and Civils Ltd | Construction | 2020 |
| Cheshire Investments & Pensions Limited | Financial services | 2004 |
| Cheshire Space Limited | Construction | 2021 |
| Cheva Biotec Ltd | Professional & scientific | 2020 |
| Chicken Bech Ltd | Hospitality | 2024 |
| Chikombe Engineering Services Limited | Construction | 2017 |
| Chokers.Co.Uk Ltd | Wholesale & retail | 2025 |
| Chris & Michael Building Solutions Limited | Construction | 2026 |
| Chris Boyd Ltd | Professional & scientific | 2010 |
| Christ Alive Gospel Ministry CIC | Administrative & support | 2024 |
| Church Green Property Ltd | Real estate | 2019 |
| Cisacc Limited | Real estate | 2022 |
| Citihill Consult Ltd | Hospitality | 2019 |
| Citizens Advice Service in the Borough of Wigan | Other services | 1989 |
| City Monitoring and Inspection Services Limited | Administrative & support | 2021 |
| Civil Court Users Association | Other services | 1990 |
| CJA Accountancy Ltd | Professional & scientific | 2025 |
| CJP Joinery & Timberframe Ltd | Construction | 2024 |
| CJT Quality & Inspection Services Limited | Professional & scientific | 2019 |
| CK New Good Food Limited | Hospitality | 2024 |
| CK Properties (NW) Limited | Real estate | 2025 |
| Claremont Building & Joinery Ltd. | Construction | 2017 |
| Clarian Developments Ltd | Real estate | 2023 |
| Class a Cleaning Limited | Administrative & support | 2020 |
| Class Solutions Ltd | Administrative & support | 2021 |
| Classic Loft Design and Build Limited | Construction | 2016 |
| Classic Tractor Workshop Ltd | Extraterritorial | 2025 |
| Clbtl Limited | Real estate | 2019 |
| Clean&Dream Ltd | Administrative & support | 2025 |
| Cleaning Services (NW) Limited | Professional & scientific | 2009 |
| Clear CUT (Leigh) Ltd | Other services | 2025 |
| Clearway Drainage Systems Limited | Construction | 1994 |
| Cleaver Associates Limited | Professional & scientific | 2014 |
| Cleercon Ltd | Professional & scientific | 2023 |
| Cleo Touch London Ltd | Information & communication | 2018 |
| CLN Technology Ltd | Wholesale & retail | 2024 |
| Clothears Costumes Ltd | Professional & scientific | 2026 |
| Cloud Access (Manchester) Limited | Information & communication | 2022 |
| Cloud Accounts Co. (North West) Ltd | Professional & scientific | 2023 |
| Cloud Vapes Ltd | Wholesale & retail | 2023 |
| CLOUDNINESTUDIO2025 Limited | Other services | 2025 |
| Clover Maid Cleaning Services Ltd | Professional & scientific | 2017 |
| Cloverleaf Garage (Blackpool) Limited | Wholesale & retail | 2014 |
| Clsc (UK) Limited | Health & social care | 2013 |
| Cneze Ltd | Health & social care | 2024 |
| Coating Consultants Limited | Construction | 2017 |
| Cockerel Consulting Ltd | Professional & scientific | 2023 |
| Coffee Seller Limited | Wholesale & retail | 2012 |
| Collins & Darwell Holdings Limited | Financial services | 2012 |
| Collins & Darwell Printers Limited | Manufacturing | 2012 |
| Colourhaus Decorating Ltd | Construction | 2023 |
| Colstan Ltd | Construction | 2016 |
| Common Farm Activities Ltd | Other services | 2026 |
| Communitea Spaces C.I.C. | Hospitality | 2017 |
| Complaint Ninja Limited | Extraterritorial | 2023 |
| Complete Elec Ltd | Construction | 2015 |
| Complete Fireplace Services Ltd | Construction | 2018 |
| Complete Property Maintenance N/W Ltd | Construction | 2025 |
| Concept (Air Conditioning and Refrigeration) Limited | Construction | 2002 |
| Concept (Air Conditioning and Refrigeration) Maintenance Ltd | Manufacturing | 2010 |
| Concept Air Conditioning Limited | Extraterritorial | 2012 |
| Conductive Hire Ltd | Administrative & support | 2026 |
| Conquest Fencing Holdings Ltd | Financial services | 2024 |
| Conquest Fencing Limited | Construction | 1999 |
| Conserve Rentals & Services Limited | Mining & quarrying | 1998 |
| Contract Joinery Nwuk Limited | Extraterritorial | 2023 |
| Control Data Limited | Other services | 2017 |
| Cooke & Company Holdings Limited | Real estate | 1996 |
| Cooke Properties Limited | Real estate | 1991 |
| Core Access Solutions Ltd | Construction | 2022 |
| Corner Lane Shell Self Serve Ltd | Wholesale & retail | 2015 |
| Corporate Direct (Europe) Ltd | Information & communication | 1994 |
| Corporate Direct Limited | Professional & scientific | 2009 |
| Corporate Telecommunications (UK) Limited | Professional & scientific | 2005 |
| Corporateleads Ltd | Information & communication | 2024 |
| Corptel Limited | Professional & scientific | 2019 |
| Corpteluk Limited | Professional & scientific | 2019 |
| Cosmol Ltd | Professional & scientific | 2020 |
| Cotswold Polo Academy LLP | | 2025 |
| Country Park Kennels Ltd | Other services | 2016 |
| County Garage (Leigh) Ltd | Wholesale & retail | 2019 |
| County Movers Ltd | Transport & logistics | 2025 |
| Court Financial Limited | Professional & scientific | 2003 |
| Courtcraft Limited | Construction | 2001 |
| Craft House LS27 Ltd | Hospitality | 2021 |
| Craft Work Supplies Ltd | Wholesale & retail | 2023 |
| Creative Homes and Buildings Limited | Construction | 2016 |
| Credential Health Care Limited | Health & social care | 2019 |
| Crew Solutions Limited | Transport & logistics | 2014 |
| Crocodile JOE Wild World Limited | Administrative & support | 2010 |
| Crown Canine Care Ltd | Wholesale & retail | 2023 |
| Crown Commercial Developments Ltd | Real estate | 2024 |
| Crown Contracting UK Ltd | Construction | 2022 |
| Crown Payroll Services Ltd | Professional & scientific | 2015 |
| Crown UK Cleaning Ltd | Administrative & support | 2022 |
| CS Investment Holdings Limited | Real estate | 2019 |
| CSK Services 2022 Limited | Transport & logistics | 2022 |
| CSL Industries Ltd | Professional & scientific | 2024 |
| Ctbw Consultants Limited | Other services | 2020 |
| CTL Property Investments Limited | Health & social care | 2024 |