| Climb - MAX Limited | Arts & recreation | 2013 |
| Clinical Restore UK Limited | Other services | 2017 |
| Clinisafe Ltd | Information & communication | 2009 |
| Clive Nicholls Limited | Professional & scientific | 2007 |
| Clive Stones (Electricians) Ltd | Construction | 2009 |
| Clockwork Production Ltd | Arts & recreation | 2004 |
| Club LOS Claveles Trustee Company Limited | Financial services | 2023 |
| Cmfv Green Property and Investment Limited | Real estate | 2025 |
| Coach Houses (Blackpool) Limited | Households | 2001 |
| Coast Welfare Ltd | Health & social care | 2021 |
| Coastal Buildings & Management Ltd | Real estate | 2021 |
| Coastal Child & Adult Therapeutic Service Limited | Health & social care | 2008 |
| Coastal Health Limited | Health & social care | 2009 |
| Coastal Life Story Ltd | Health & social care | 2025 |
| Coastal Resorts Investments & Developments NWO19 Ltd | Real estate | 2021 |
| Coastal Resorts Properties Ltd | Real estate | 2021 |
| Coastpath Limited | Real estate | 1994 |
| Code Edge Technologies Limited | Information & communication | 2021 |
| Codoo Technologies Limited | Information & communication | 2020 |
| Coffeejuice & Co Limited | Hospitality | 2018 |
| Cognatec Limited | Real estate | 2000 |
| Comedy Dining Ltd | Arts & recreation | 2017 |
| Comedy Tributes Ltd | Arts & recreation | 2021 |
| Complete Fylde Care Limited | Health & social care | 2013 |
| Complete Logistical Services Ltd | Transport & logistics | 2023 |
| Complete Logistical Solutions Ltd | Transport & logistics | 2018 |
| Comsci Research Ltd | Professional & scientific | 2025 |
| Conceptism Community Workshops CIC | Health & social care | 2024 |
| Conceptism Limited | Professional & scientific | 2024 |
| Concord Business Consultants Ltd | Administrative & support | 2014 |
| Condition Insight Ltd | Professional & scientific | 2024 |
| Connect Community Groups CIC | Arts & recreation | 2023 |
| Conneely Consulting Services Ltd | Professional & scientific | 2024 |
| Conningsleigh Ltd | Education | 2025 |
| Connolly Lettings Ltd | Real estate | 2025 |
| Conservatory Roof Insulation Ltd | Construction | 2014 |
| Consider I.T. Solutions Ltd | Wholesale & retail | 2017 |
| Construire Limited | Real estate | 2018 |
| Consultade Limited | Information & communication | 2014 |
| Contratax Limited | Professional & scientific | 2013 |
| Control Designs Ltd | Information & communication | 2020 |
| Conway Construction Ltd | Construction | 2022 |
| Cool Hand Consulting Ltd | Information & communication | 2018 |
| Cool Hand Properties Ltd | Real estate | 2021 |
| Cooper Property Claims Limited | Financial services | 2023 |
| Coopers Way Property Management Ltd | Households | 2020 |
| Corbellin Developments Ltd | Construction | 2020 |
| Corbellin Holdings Ltd | Real estate | 2020 |
| Corbellin Services Ltd | Administrative & support | 2023 |
| Corbenyah Developments Limited | Construction | 2023 |
| Corbenyah Ltd | Professional & scientific | 2002 |
| Corbenyah Properties Limited | Real estate | 2019 |
| Corbenyah Yachts Group Limited | Professional & scientific | 2024 |
| Cordapse Ltd | Information & communication | 2019 |
| Cordatus Consulting Limited | Financial services | 2022 |
| Core Collection Accomodation Limited | Hospitality | 2023 |
| Core Collection Group Limited | Professional & scientific | 2019 |
| Core Management Holdings Limited | Professional & scientific | 2019 |
| Core Utility Ltd | Administrative & support | 2016 |
| Corner Shop Lytham Ltd | Wholesale & retail | 2020 |
| Corporate & Personal Wealth Solutions Limited | Financial services | 2015 |
| Cosmic Codes Digital Limited | Wholesale & retail | 2025 |
| Cosmic Shift Ltd | Professional & scientific | 2023 |
| Costal Calm Recovery Ltd | Health & social care | 2026 |
| Cottam Stores Ltd | Wholesale & retail | 2015 |
| Cottis Partners Ltd | Professional & scientific | 2014 |
| Countrywide Adventures Ltd | Wholesale & retail | 2021 |
| Court Royal Residents Company Ltd | Hospitality | 2010 |
| COX LCF Ltd | Financial services | 2014 |
| Coyle Locum Medical Limited | Health & social care | 2014 |
| Cozycool Ltd | Construction | 2013 |
| CP Juice Bar Ltd | Hospitality | 2025 |
| Craft and Common Ltd | Wholesale & retail | 2023 |
| Creative Landscapes & Driveways Ltd | Administrative & support | 2025 |
| Creative Sparc Architects Limited | Professional & scientific | 2012 |
| Creed Project Management Limited | Professional & scientific | 2022 |
| Crestvista Limited | Administrative & support | 2008 |
| CRO Informatics Limited | Professional & scientific | 2015 |
| Croft Avenue Care Home Limited | Health & social care | 2021 |
| Crook & Harrison Holdings Ltd | Health & social care | 2022 |
| Crookdale House Limited | Real estate | 2021 |
| Cryo Body Stimulus Ltd | Health & social care | 2015 |
| Crystal Accountants Services Ltd | Professional & scientific | 2020 |
| Crystal Clean Warton (North West) Limited | Other services | 2016 |
| Crystal Lodge Limited | Households | 1985 |
| CS Pharma Ltd | Professional & scientific | 2011 |
| CSP Programme Management Limited | Information & communication | 2015 |
| CSR Property Ltd | Other services | 2021 |
| CT Electrics (Huddersfield) Limited | Construction | 2011 |
| CTH Commercial Ltd | Real estate | 2025 |
| Cuddy Homes Ltd | Real estate | 2025 |
| CUE7 Snooker Ltd | Arts & recreation | 2026 |
| Cuffe and Lacey Associates Limited | Health & social care | 2018 |
| Cuffe and Lacey Social Work and Therapeutic Services CIC | Health & social care | 2015 |
| Cuillin Ridge Ltd | Professional & scientific | 2018 |
| Cullen Renewable Energy Limited | Construction | 2024 |
| Custom Marshalling Systems Ltd | Administrative & support | 2014 |
| Custom PC Repair Limited | Information & communication | 2013 |
| Cutler Shepherd & Co Ltd | Construction | 2024 |
| CW Surveys Ltd | Professional & scientific | 2026 |