| Citadel Project Management Ltd | Construction | 2011 |
| City Car Storage Ltd | Administrative & support | 2022 |
| City Computer Services Limited | Information & communication | 2004 |
| City Furniture Hire (Properties) Limited | Administrative & support | 1999 |
| City Furniture Hire Limited | Wholesale & retail | 2021 |
| City Ground Hero Limited | Wholesale & retail | 2023 |
| City Illuminations Limited | Construction | 2001 |
| City Quantity Surveyors Limited | Professional & scientific | 2017 |
| City Sitemix Concrete Limited | Manufacturing | 2004 |
| City Used & Recycled Office Furniture Limited | Wholesale & retail | 2021 |
| Citysmith Limited | Other services | 2018 |
| Civcon Projects Limited | Professional & scientific | 1999 |
| Civil Engineering Contractors Association, North West Limited | Other services | 2006 |
| Civils & Rail Limited | Administrative & support | 2012 |
| CJ Artists Ltd | Arts & recreation | 2011 |
| CJ Automotive Limited | Wholesale & retail | 2012 |
| CJ Drummond Advisory Ltd | Administrative & support | 2025 |
| CJ Engineering Limited | Administrative & support | 2010 |
| CJ Holdings (North West) Ltd | Real estate | 2023 |
| CJ IT Consultancy Limited | Administrative & support | 2015 |
| CJ Prime Construction Limited | Construction | 2024 |
| CJ Wright Consulting Limited | Professional & scientific | 2020 |
| Cjb-It Consulting Limited | Administrative & support | 2016 |
| CJD Partners Limited | Information & communication | 2023 |
| CJF Social Care Ltd | Health & social care | 2026 |
| CJH Planning Solutions Ltd | Professional & scientific | 2017 |
| CJJ Consultancy Limited | Administrative & support | 2026 |
| CJL Diagnostics Ltd | Information & communication | 2013 |
| CJL Fire Ltd | Financial services | 2025 |
| Cjla Consulting Ltd | Professional & scientific | 2021 |
| CJM Project Consulting Ltd | Professional & scientific | 2012 |
| CJP Property Investments Limited | Professional & scientific | 2012 |
| CJR Electrical Services Ltd | Construction | 2021 |
| CJR Property Development Limited | Real estate | 2014 |
| CJR Retailing Limited | Wholesale & retail | 2011 |
| Cjrb Services Limited | Information & communication | 2019 |
| CJT Commercial Services Limited | Other services | 2018 |
| CJU Consultancy Ltd | Manufacturing | 2025 |
| CJV Services Limited | Other services | 2018 |
| CJW Engineers Limited | Administrative & support | 2021 |
| CK Agriculture Ltd | Agriculture & fishing | 2022 |
| CK Infrastructure Solutions Limited | Information & communication | 2015 |
| CK MED Consulting Ltd | Professional & scientific | 2025 |
| CK Tuition and Education Limited | Education | 2026 |
| CKC Joinery Ltd | Construction | 2018 |
| CKE Consulting Limited | Professional & scientific | 2017 |
| Ckkt Moore Ltd | Administrative & support | 2026 |
| CKW Consultants Limited | Professional & scientific | 2017 |
| CL Commercial Services Limited | Administrative & support | 2017 |
| CL Creations and Maintenance Ltd | Arts & recreation | 2024 |
| CL Travel Solutions (International) Ltd | Administrative & support | 2015 |
| Claddagh Civils Ltd | Professional & scientific | 2018 |
| Claire Elliott Consulting Ltd | Administrative & support | 2011 |
| Claire Gregory Consultancy Ltd | Education | 2025 |
| Claney Ltd | Wholesale & retail | 2024 |
| Clara IT Limited | Information & communication | 2021 |
| Claremont Group Interiors (EBT) Limited | Administrative & support | 2024 |
| Claremont Group Interiors (EOT) Limited | Administrative & support | 2020 |
| Claremont Group Interiors Limited | Construction | 1996 |
| Claremont Interior Solutions LLP | | 2006 |
| Claret Properties Limited | Construction | 2020 |
| Clareve Ltd | Real estate | 2025 |
| Claritix Ltd | Professional & scientific | 2015 |
| Clarity Business Solutions Ltd | Administrative & support | 2024 |
| Clarity Procurement Solutions Limited | Professional & scientific | 2007 |
| Clarityrfi Limited | Information & communication | 2026 |
| Clark Admin Services Ltd | Administrative & support | 2023 |
| Clarke Consulting Group Limited | Administrative & support | 2025 |
| Clarke Design Weights Limited | Administrative & support | 2013 |
| Clarkestone Limited | Other services | 2018 |
| Class CUT Warrington Ltd | Other services | 2024 |
| Classic Investments and Assets UK Ltd | Administrative & support | 2023 |
| Classic Rock OIL Company Limited | Wholesale & retail | 2009 |
| Claudia Font Legal Limited | Professional & scientific | 2017 |
| Claughton Cavern Ltd | Hospitality | 2025 |
| Clayms Ltd | Professional & scientific | 2022 |
| Claypit Ltd | Information & communication | 2012 |
| Clayton Holiday Lettings Ltd | Extraterritorial | 2023 |
| Clayton Motors (Manchester) Limited | Wholesale & retail | 1960 |
| Clayton Site Services Limited | Construction | 2002 |
| CLD Global Limited | Administrative & support | 2017 |
| Clean & Gleam With Natalie & Christine Ltd | Administrative & support | 2022 |
| Clean Air Design Limited | Administrative & support | 2021 |
| Clean by Lisa Ltd | Administrative & support | 2019 |
| Clean Energy & Infrastructure 6 UK Limited | Financial services | 2017 |
| Clean Energy and Infrastructure 6 UK Holdings Limited | Financial services | 2017 |
| Clean Energy and Infrastructure UK Limited | Financial services | 2013 |
| Clean Energy and Infrastructure UK Wind 2 Limited | Financial services | 2015 |
| Clean Energy and Infrastructure UK Wind Limited | Financial services | 2014 |
| Clean Holmes Ltd | Administrative & support | 2020 |
| Cleaners UK Limited | Administrative & support | 2003 |
| Cleaning Angels EST 2022 Limited | Administrative & support | 2022 |
| Cleaning Spotless Ltd | Administrative & support | 2017 |
| Cleansweep (Manchester) Limited | Administrative & support | 2010 |
| Cleansweep Window Division Limited | Administrative & support | 2020 |
| Clear Dawn Comms and Media Ltd | Other services | 2016 |
| Clear Drains Northwest Limited | Water & waste | 2020 |
| Clear Eyed Consulting Ltd | Professional & scientific | 2019 |
| Clear Group NW Limited | Construction | 2023 |
| Clear Performance Ltd | Professional & scientific | 2009 |