| Conservation Contracts North West Holdings Limited | Financial services | 2009 |
| Conservation Contracts North West Limited | Construction | 2004 |
| Consillium Consultancy Limited | Professional & scientific | 2023 |
| Console Wizard Limited | Information & communication | 2009 |
| Constrotech Ltd | Construction | 2023 |
| Construct IT CM Ltd | Professional & scientific | 2022 |
| Construct IT Estates Ltd | Financial services | 2025 |
| Construction Guarantee Solutions Limited | Financial services | 2015 |
| Construction Management Consultancy Ltd | Construction | 2025 |
| Construction Materials Direct Ltd | Wholesale & retail | 2021 |
| Construction Supplies (Adlington) Limited | Extraterritorial | 1979 |
| Constructive Living Ltd | Real estate | 2002 |
| Consult Keegan Limited | Administrative & support | 2023 |
| Consult-Meds Ltd | Wholesale & retail | 2025 |
| CONSULT3D Ltd | Professional & scientific | 2020 |
| Consultair Projects Ltd | Professional & scientific | 2026 |
| Consultancy North West Ltd | Professional & scientific | 2019 |
| Consultant Support Ltd | Administrative & support | 2006 |
| Consultants Collective Group Ltd | Professional & scientific | 2024 |
| Consulted IT Limited | Information & communication | 2022 |
| Consulting Technical Limited | Professional & scientific | 2026 |
| Consultwired Ltd | Information & communication | 2022 |
| CONSUME4LESS Limited | Wholesale & retail | 2018 |
| Contact Guards Ltd | Manufacturing | 2025 |
| Contactventure Ltd | Transport & logistics | 2023 |
| Contemporary Homes Limited | Other services | 2006 |
| Contento Racking and Shelving Limited | Construction | 2018 |
| Contex Interiors Limited | Wholesale & retail | 1991 |
| Context Pneumatic Supplies Limited | Manufacturing | 2008 |
| Continental Goods Transport Ltd | Transport & logistics | 2025 |
| Continentsfood Limited | Wholesale & retail | 2025 |
| Contingent & Future Technologies Ltd | Information & communication | 2019 |
| Contiquip Limited | Manufacturing | 2009 |
| Contor Holdings Ltd | Financial services | 2023 |
| Contour Aesthetics Global Ltd | Administrative & support | 2017 |
| Contraception Education CIC | Wholesale & retail | 2001 |
| Control ALT Delete Ltd | Information & communication | 2024 |
| Control Automation Limited | Manufacturing | 1988 |
| Controlled Cooling Ltd | Construction | 2021 |
| Controlmotive Limited | Information & communication | 2017 |
| Controlworx Ltd | Professional & scientific | 2020 |
| Conundrum Films Ltd | Information & communication | 2011 |
| Convene Property Ltd | Real estate | 2018 |
| Convenience Store (Bacup) Ltd | Wholesale & retail | 2022 |
| Convenient Auto Care Limited | Wholesale & retail | 2025 |
| Convergence Technologies (UK) Limited | Real estate | 2001 |
| Converj Limited | Information & communication | 2009 |
| Conversation and Culture Ltd | Education | 2026 |
| Convertrix Ltd | Professional & scientific | 2023 |
| Convery Well Ltd | Professional & scientific | 2023 |
| Conveyprep Limited | Professional & scientific | 2026 |
| Convult Ltd | Wholesale & retail | 2023 |
| Conwy Beekeepers Limited | Professional & scientific | 2014 |
| Conwy Court Limited | Real estate | 2002 |
| Cookies and Crinkles Limited | Manufacturing | 2022 |
| Cooking With Zainab Ltd | Hospitality | 2021 |
| Cool Innovation Consulting Ltd | Information & communication | 2019 |
| Cool Move Property Group Ltd | Real estate | 2023 |
| Cool OFF Ltd | Health & social care | 2023 |
| Cool Studio Limited | Information & communication | 2019 |
| Cool Tech Air Conditioning (UK) Limited | Construction | 2007 |
| Cooler Planet Solutions Limited | Energy | 2020 |
| Coolvent Limited | Construction | 2012 |
| Coombes Investments Limited | Real estate | 2018 |
| Cooper Crafted Property Limited | Real estate | 2025 |
| Cooper Healthcare Limited | Professional & scientific | 2012 |
| Cooper Painting & Decorating Ltd | Construction | 2016 |
| Cooperjackson (UK) Ltd | Administrative & support | 2011 |
| Coote on the Water Ltd | Transport & logistics | 2026 |
| Copary Limited | Professional & scientific | 2020 |
| Cope on the Road Ltd | Education | 2024 |
| Copelands Estate Agents Limited | Real estate | 2015 |
| Coplin Family Investments Ltd | Financial services | 2012 |
| Coplin Holdings Limited | Real estate | 2022 |
| Coppice Holdings Limited | Financial services | 2020 |
| Coppice Labs Ltd | Information & communication | 2025 |
| Coppice Procurement Limited | Administrative & support | 2025 |
| Copras Specialities Limited | Manufacturing | 1955 |
| Copthorne Cattery Ltd | Other services | 2023 |
| Copy Print Services Limited | Other services | 2006 |
| Corbin Digital Limited | Administrative & support | 2022 |
| Corcoran & SON Roofing Ltd | Construction | 2026 |
| Cordon Blue Ltd | Health & social care | 2018 |
| Cordon Properties Ltd | Real estate | 2020 |
| Core Align Consulting Ltd | Information & communication | 2025 |
| Core Building Services Design Ltd | Energy | 2023 |
| Core Estates NW Limited | Real estate | 2022 |
| Core Feeds Ltd | Manufacturing | 2026 |
| Core Heat Plumbing Bolton Ltd | Construction | 2026 |
| Core Link IT Services Limited | Information & communication | 2025 |
| Core Plus Ltd | Extraterritorial | 2018 |
| Core Serve Solutions Ltd | Construction | 2026 |
| CORE4B Community-Oriented Research and Engagement for Black Communities CIC | Education | 2026 |
| Corey Ltd | Wholesale & retail | 2026 |
| Cork Utilities Ltd | Administrative & support | 2021 |
| Corkers Transport Limited | Transport & logistics | 2025 |
| Cornelia Holdings 2026 Ltd | Financial services | 2026 |
| Corner Cafe (Kearsley) Limited | Hospitality | 2019 |
| Corner Convenience Chorley Ltd | Wholesale & retail | 2025 |
| Corner Lounge Urmston Limited | Hospitality | 2020 |