| Commerzo Ltd | Wholesale & retail | 2025 |
| Common Barber BL1 Ltd | Other services | 2019 |
| Common Interest Films Ltd | Information & communication | 2018 |
| Commonhall Limited | Construction | 2021 |
| Commonhall Street Management Company Limited | Households | 2024 |
| Communia Consulting Ltd | Professional & scientific | 2024 |
| Community Care Options | Health & social care | 1991 |
| Community Compass Consultancy Ltd | Professional & scientific | 2023 |
| Community Cutz C.I.C. | Education | 2014 |
| Community Help & Information Service C.I.C. | Health & social care | 2017 |
| Community Hive CIC | Arts & recreation | 2023 |
| Community Prospects CIC | Education | 2015 |
| Compact Instruments Limited | Manufacturing | 2003 |
| Companion Support Services Ltd | Health & social care | 2017 |
| Companions in Care Ltd | Health & social care | 2023 |
| Compare Dual Fuel Ltd | Professional & scientific | 2012 |
| Comparo Energy Limited | Professional & scientific | 2014 |
| Compass Immigration Law Ltd | Administrative & support | 2011 |
| Compass Printing & Packaging Limited | Manufacturing | 2002 |
| Compass Renewables Ltd | Construction | 2025 |
| Compass Window Cleaning Ltd | Administrative & support | 2022 |
| Compass Window Cleaning NW Ltd | Manufacturing | 2025 |
| Compassion Homes Ltd | Health & social care | 2020 |
| Compazz Ltd | Professional & scientific | 2019 |
| Comperio Consulting Limited | Other services | 2020 |
| Competa 2025 Ltd | Financial services | 2025 |
| Competent People Safety Consulting Limited | Professional & scientific | 2022 |
| Complete Alpha Ltd | Professional & scientific | 2016 |
| Complete Business Solutions (NW) Limited | Information & communication | 2005 |
| Complete Care 4 U Limited | Health & social care | 2021 |
| Complete Cart Ltd | Wholesale & retail | 2024 |
| Complete Cloud Properties Limited | Households | 2023 |
| Complete Cloud Solution Ltd | Information & communication | 2018 |
| Complete Commercial Repairs Limited | Wholesale & retail | 2018 |
| Complete Construction (BL) Ltd | Construction | 2023 |
| Complete Construction (Bolton) Ltd | Construction | 2016 |
| Complete Electrical Solutions North West Ltd | Construction | 2014 |
| Complete Integrated Support Solutions Ltd | Professional & scientific | 2011 |
| Complete Iwear Limited | Health & social care | 2018 |
| Complete LAB Solutions Ltd | Professional & scientific | 2024 |
| Complete Manufacturing Solutions Limited | Manufacturing | 2008 |
| Complete Metering Services Ltd | Energy | 2018 |
| Complete Plumbing & GAS Services Limited | Construction | 2020 |
| Complete Purchasing Consultancy Limited | Professional & scientific | 2018 |
| Complex Expert Reports Ltd | Professional & scientific | 2021 |
| Compli-Uk Ltd | Professional & scientific | 2024 |
| Compliance Cleaners Limited | Administrative & support | 2025 |
| Compliance Companion Ltd | Professional & scientific | 2025 |
| Compliance Right Limited | Professional & scientific | 2021 |
| Compliant Dining Consultants Limited | Professional & scientific | 2020 |
| Compuhost Limited | Information & communication | 2007 |
| Computex Ltd | Other services | 2026 |
| Comsolutions (UK) Limited | Information & communication | 2001 |
| Comulus Ltd | Information & communication | 2019 |
| Cona Investments Limited | Administrative & support | 2024 |
| Conair Cooling Ltd | Construction | 2022 |
| Conall Science Ltd | Professional & scientific | 2025 |
| Concept Building Services (North) Ltd | Construction | 2017 |
| Concept Management Consulting Limited | Information & communication | 2009 |
| Concept Multibox Limited | Manufacturing | 2015 |
| Conceptech Limited | Professional & scientific | 2019 |
| Concrete Drilling Services Ltd. | Administrative & support | 1995 |
| Condec Construction Ltd | Construction | 2021 |
| Condec Containers & Storage Ltd | Real estate | 2024 |
| Condensation Cured Ltd | Construction | 2012 |
| Condor Analytics Limited | Information & communication | 2019 |
| Condor Combifloor Limited | | 2005 |
| Condron Concrete UK Limited | Other services | 2019 |
| Conex International Trading Limited | Wholesale & retail | 2026 |
| Confident Tailors Ltd | Wholesale & retail | 2023 |
| Confidently Yours Limited | Wholesale & retail | 2024 |
| Confused by Tech Ltd | Information & communication | 2025 |
| Coniston IT Ltd | Information & communication | 2017 |
| Conkyp Driver Services Ltd | Transport & logistics | 2026 |
| Connaught Perimeter Protection Limited | Construction | 2025 |
| Connaught Security Services Ltd | Construction | 2025 |
| Connect Brokers Limited | Financial services | 2018 |
| Connect Construct Ltd | Construction | 2013 |
| Connect Executive Search Group Ltd | Administrative & support | 2018 |
| Connect for Land Limited | Professional & scientific | 2014 |
| Connect IT ALL Ltd | Information & communication | 2024 |
| Connect Tutoring Ltd | Education | 2020 |
| Connect.Studio NW Ltd | Other services | 2017 |
| CONNECT2CARGO Limited | Transport & logistics | 2020 |
| Connected Consultants Limited | Professional & scientific | 2018 |
| Connecti-Fi Installations Ltd | Construction | 2025 |
| Connectifi Ltd | Information & communication | 2023 |
| Connection International Ltd | Wholesale & retail | 2024 |
| Connections in Motion Ltd | Education | 2025 |
| CONNECTM2M Limited | Wholesale & retail | 2014 |
| Connector Media Community Interest Company | Arts & recreation | 2007 |
| Connext Ltd | Manufacturing | 2011 |
| Connolly Operations Ltd | Construction | 2025 |
| Connollys & Harvey Ltd | Administrative & support | 2017 |
| Conquer Enterprises Ltd | Wholesale & retail | 2025 |
| Conquest Holdings Limited | Financial services | 2017 |
| Conquest Joinery and Sectional Building Company Limited | Manufacturing | 1979 |
| Conroy PHR Ltd | Construction | 2024 |
| Conscious Wellness Collective Limited | Health & social care | 2026 |
| Consensus Leisure Ltd | Administrative & support | 2013 |