| Complaint Solution Limited | Information & communication | 2014 |
| Complete Auto Assist Ltd | Wholesale & retail | 2026 |
| Complete Business Management & Consultancy Ltd | Professional & scientific | 2022 |
| Complete Cleaning Solutions (Ccs-Uk) Ltd | Administrative & support | 2017 |
| Complete Company Solutions Ltd | Extraterritorial | 2013 |
| Complete Construction (Yorkshire) Limited | Construction | 2020 |
| Complete Healthcare Service Ltd | Wholesale & retail | 2025 |
| Complete Information Solutions Ltd | Information & communication | 2008 |
| Complete IT Systems Limited | Wholesale & retail | 2007 |
| Complete Service Management Ltd | Manufacturing | 2002 |
| Complete Today Limited | Construction | 2014 |
| Complete Vision Social Care Ltd | Health & social care | 2023 |
| Complex Engineering Solutions Ltd | Manufacturing | 2023 |
| Compliance Consultancy Matters Ltd | Professional & scientific | 2024 |
| Compliant Recruitment Solutions Limited | Administrative & support | 2024 |
| Compliant Survey and Installation Ltd | Construction | 2016 |
| Comply House Ltd | Information & communication | 2026 |
| Composite Door Specialists Ltd | Construction | 2026 |
| Compvac Engineering Limited | Wholesale & retail | 2025 |
| Comres Limited | Manufacturing | 2019 |
| Comtech Networks Ltd | Wholesale & retail | 2024 |
| Comtech Vision Ltd | Wholesale & retail | 2013 |
| Comus Stalwart Services Limited | Public administration | 2021 |
| Concept Comms Limited | Information & communication | 2005 |
| Concept Jinnah LLP | | 2019 |
| Concept Phones Ltd. | Information & communication | 2019 |
| Concept Repairs Centre Ltd | Wholesale & retail | 2025 |
| Concept Traders Ltd | Transport & logistics | 2025 |
| Concerthouse Limited | Wholesale & retail | 2025 |
| Concirrus Holdings Limited | Information & communication | 2023 |
| Concirrus Ltd | Information & communication | 2011 |
| Concordia Mentis Ltd | Administrative & support | 2025 |
| Conditioned Training Ltd | Other services | 2010 |
| Conexous Ltd | Information & communication | 2019 |
| Confession Inns Limited | Hospitality | 2022 |
| Confidential Consultancy & Digital Marketing Ltd | Professional & scientific | 2021 |
| Confluence Viewpoint Limited | Financial services | 2019 |
| Confluence Viewpoint Topco Limited | Financial services | 2022 |
| Coniston Heating Limited | Construction | 2020 |
| Connect Accountancy (Yorkshire) Limited | Professional & scientific | 2020 |
| Connect Motors Ltd | Wholesale & retail | 2017 |
| Connect Sales and Marketing Limited | Administrative & support | 2021 |
| Connect Vehicle Sales Ltd | Wholesale & retail | 2018 |
| Connected-It Business Services Group Limited | Financial services | 2024 |
| Connected-It Business Services Limited | Wholesale & retail | 2018 |
| Connecting Roma C.I.C. | Professional & scientific | 2019 |
| Connecting Roma Middlesbrough C.I.C. | Arts & recreation | 2024 |
| Connecting U Limited | Wholesale & retail | 2013 |
| Connection Creative Ltd | Professional & scientific | 2014 |
| Connectwealth Limited | Administrative & support | 2024 |
| Connexent Ltd | Manufacturing | 2021 |
| Connextar Technologies Ltd | Information & communication | 2013 |
| Connoisseur Cards Limited | Extraterritorial | 1967 |
| Connoisseur Cleaning Solutions Ltd | Administrative & support | 2025 |
| Connolly PUB Management Limited | Hospitality | 2022 |
| Conrad Wolfe Ltd | Financial services | 2018 |
| Consept Logistics Limited | Professional & scientific | 2024 |
| Conservation Estates Ltd | Wholesale & retail | 2016 |
| Considerate Developments Ltd | Construction | 2013 |
| Consistent Services Ltd | Other services | 2023 |
| Consolidated Distribution Holdings, Ltd. | Wholesale & retail | 2019 |
| Constantine Foods Ltd | Wholesale & retail | 2025 |
| Construction and Plumbing Services Ltd | Construction | 2025 |
| Construction Leasing Solutions Limited | Administrative & support | 2025 |
| Constructions 4 ALL Ltd | Construction | 2022 |
| Constructwise Ltd | Construction | 2016 |
| Consult & Grow Services Ltd | Information & communication | 2025 |
| Consulting Compass Ltd | Professional & scientific | 2025 |
| Consultium Advisory Limited | Professional & scientific | 2024 |
| CONTAINERSTORAGE4U Limited | Administrative & support | 2021 |
| Contempo Glass Design Ltd | Construction | 2025 |
| Contest Athletics Ltd | Wholesale & retail | 2025 |
| Context Fabrics Limited | | 1987 |
| Continental Cement Limited | Manufacturing | 2025 |
| Continental Kitchen Ltd | Hospitality | 2022 |
| Contract Surveying Services Ltd | Professional & scientific | 2018 |
| Controlx Engineering Ltd | Professional & scientific | 2025 |
| Converse Investments Limited | Real estate | 2021 |
| Conzac Solutions Limited | Health & social care | 2018 |
| Cook Magic Ltd | Wholesale & retail | 2024 |
| Cookes Tavern Limited | Hospitality | 2025 |
| Cookielove Ltd | Public administration | 2021 |
| Cookies Crumble Limited | Hospitality | 2025 |
| Cookridge Decorating Services Limited | Other services | 2012 |
| Cool TEX Ltd | Wholesale & retail | 2010 |
| Cool TEX Wholesale Limited | Wholesale & retail | 2025 |
| Cooling Parts & Services Limited | Wholesale & retail | 2003 |
| Coop Group Recruitment Limited | Administrative & support | 2017 |
| Cooper Hall Solicitors Limited | Professional & scientific | 2017 |
| Cooper Lane Stores Ltd | Wholesale & retail | 2012 |
| Cooper PO Retail Ltd | Wholesale & retail | 2020 |
| Cooper-Tyrrell Property Solutions Ltd | Real estate | 2025 |
| Coopers Building Contractors Limited | Construction | 2009 |
| Coppergate Trading Limited | Wholesale & retail | 2024 |
| Coppice Collective CIC | Manufacturing | 2022 |
| Coral Mill Investment Limited | Real estate | 2018 |
| Coral Windows (Bradford) Limited | Manufacturing | 1990 |
| Coral Windows Limited | Construction | 1995 |
| Coral Yorkshire Holdings Limited | Financial services | 2026 |
| Cordoba Consulting Ltd | Administrative & support | 2021 |