| Cloud Sauce Solutions Ltd | Information & communication | 2017 |
| Cloudwater Limited | Information & communication | 2005 |
| Clover Projects Limited | Transport & logistics | 2019 |
| Cloverbrook Holdings Ltd | Financial services | 2003 |
| Cloverbrook Limited | Manufacturing | 1979 |
| Clprojectsuk Limited | Manufacturing | 2016 |
| Club Chesterfield Limited | Wholesale & retail | 2009 |
| Club Cleaning Technologies Ltd | Administrative & support | 2024 |
| CM Elite Sports Physio Ltd | Other services | 2022 |
| Cmar Consultancy Ltd | Health & social care | 2022 |
| CMC Asbestos Surveys Limited | Construction | 2004 |
| Cmrb Limited | Real estate | 2025 |
| Cmyk Burnley Ltd | Manufacturing | 2014 |
| CNR Civils Limited | Construction | 2025 |
| Coal Clough Singh Stores Ltd | Wholesale & retail | 2022 |
| Cobden Group Limited | Real estate | 2025 |
| Codaco Ltd | Construction | 2018 |
| Coffee Nightmares Ltd | Hospitality | 2026 |
| COG Lane Supermarket Ltd | Wholesale & retail | 2014 |
| COG Lane Tyres and Autocare Ltd | Wholesale & retail | 2025 |
| Cohiba Support Services Limited | Administrative & support | 2002 |
| Coldwell Park Ltd | Wholesale & retail | 2012 |
| Coleman Squared Limited | Real estate | 2024 |
| College Accountancy Services Limited | Professional & scientific | 2004 |
| Collins White Limited | Wholesale & retail | 2012 |
| Colne 1 Limited | Real estate | 2020 |
| Colne Road News Ltd | Wholesale & retail | 2019 |
| Colne Road Service & MOT Limited | Wholesale & retail | 2025 |
| Colorlord Limited | Wholesale & retail | 2007 |
| Colossus Property Ltd | Real estate | 2014 |
| Comberbach Property Developments Ltd | Construction | 2025 |
| Come and Play Childcare Ltd | Health & social care | 2014 |
| Commercial Deep Cleaning Solutions Limited | Professional & scientific | 2019 |
| Common Places Group Limited | Construction | 2019 |
| Commtrack Ltd | Information & communication | 2015 |
| Complete Care Services (North West) Limited | Health & social care | 2024 |
| Complete Drain Services Limited | Water & waste | 2002 |
| Complete Interior Cleaning Solutions Ltd | Administrative & support | 2026 |
| Complete Sleep Mastery Ltd | Wholesale & retail | 2024 |
| Complicentric Ltd | Information & communication | 2025 |
| Concept Hair Limited | Other services | 2002 |
| Concept Kitchens and Bedrooms Ltd | Manufacturing | 2019 |
| Concept Kitchens N Bedrooms Ltd | Manufacturing | 2026 |
| Concept Masonry NW Ltd | Construction | 2025 |
| Concord Connections CIC | Professional & scientific | 2025 |
| Concord Consultations Ltd | Professional & scientific | 2025 |
| Confections Limited | Financial services | 2016 |
| Confident Beauty Training Ltd | Other services | 2023 |
| Connect Mobile Burnley Ltd | Wholesale & retail | 2026 |
| Connect Security Solutions Ltd | Administrative & support | 2004 |
| Connect Steel Limited | Construction | 2021 |
| Connect Vehicle Solutions Ltd | Wholesale & retail | 2023 |
| CONNECT2MARKETS Ltd | Manufacturing | 2008 |
| Connecta Healthcare Ltd | Transport & logistics | 2022 |
| Connolly Civil Engineering Ltd | Construction | 2026 |
| Constance Manufacturing Ltd | Wholesale & retail | 2020 |
| Constance Mckenzie Limited | Real estate | 2021 |
| Constellation Tech Ltd | Other services | 2024 |
| Construction Company Combined Ltd. | Construction | 2009 |
| Construction Sites Web Limited | Information & communication | 2026 |
| Contact 24/7 Ltd | Wholesale & retail | 2021 |
| Continentals Barbecue House Limited | Hospitality | 2014 |
| Continentals Coffee Shop Limited | Hospitality | 2014 |
| Contour Cube Limited | Wholesale & retail | 2023 |
| Contour Landscapes Ltd | Administrative & support | 1983 |
| Convenience 4 U Ltd | Wholesale & retail | 2025 |
| Conways Engineering Ltd | Professional & scientific | 2019 |
| Conways Properties Ltd | Real estate | 2025 |
| Cool Plus Limited | Energy | 2010 |
| Cophall Parking Gatwick Ltd | Transport & logistics | 2005 |
| Copiam Investments Ltd | Financial services | 2018 |
| Copper Bridge Consultancy Ltd | Professional & scientific | 2025 |
| Copymark (Service) Limited | Manufacturing | 2010 |
| Coral Energy Solutions Ltd | Manufacturing | 2025 |
| Coral Financial Ltd | Financial services | 2015 |
| Core Machinery Limited | Other services | 2020 |
| CORE12 Ltd | Financial services | 2023 |
| Corebase Extensions & Groundwork Ltd | Construction | 2025 |
| Corehold Limited | Financial services | 2024 |
| Corevolt Electrical Ltd | Construction | 2025 |
| Corkhouse Kitchen Ltd | Hospitality | 2026 |
| Corlay & Co Limited | Manufacturing | 2003 |
| Corlay Holdings Limited | Financial services | 2012 |
| Corvino Mechanical Services Limited | Professional & scientific | 2016 |
| Cosmetic Aesthetics Beauty Ltd | Health & social care | 2020 |
| Cosmetic Aesthetics Holdings Limited | Financial services | 2022 |
| Cosmetic Aesthetics Limited | Health & social care | 2015 |
| Cosmetic Aesthetics Training Academy Ltd | Other services | 2017 |
| Cosmic Rays BRN Ltd | Wholesale & retail | 2025 |
| Costelicom Ltd | Construction | 2022 |
| Costswise Ltd | Other services | 2013 |
| Cosy Comfy Limited | Manufacturing | 2024 |
| Cosy Haven Ltd | Hospitality | 2024 |
| Cosy Sofas House Ltd | Manufacturing | 2025 |
| Counters Limited | Wholesale & retail | 2017 |
| Countryside Learning | Education | 1986 |
| County Sales Limited | Wholesale & retail | 2000 |
| Covar Limited | Construction | 2018 |
| CP Commercial Services Limited | Professional & scientific | 2025 |
| CR & DR Limited | Professional & scientific | 2018 |