| Community Justice Centre Leeds Ltd | Professional & scientific | 2026 |
| Community of Kelham Central CIC | Real estate | 2021 |
| Community of Stãll CIC | Energy | 2024 |
| Community Revival Mission Community Interest Company | Professional & scientific | 2026 |
| Community Revivalmission Ltd | Professional & scientific | 2025 |
| Community Solutions for Primary Care (Barnsley) Limited | Professional & scientific | 2003 |
| Community Support Solutions Ltd | Health & social care | 2025 |
| Community Values CIC | Hospitality | 2022 |
| Comouk Trust | Transport & logistics | 2002 |
| Company Car Rentals UK Limited | Administrative & support | 1994 |
| Company Closures Limited | Professional & scientific | 2022 |
| Company Flooring Ltd | Wholesale & retail | 2015 |
| Company Messa Properties Ltd | Real estate | 2025 |
| Compare My Wealth Manager Limited | Professional & scientific | 2004 |
| Compare Retirement Limited | Professional & scientific | 2024 |
| Comparisontiger Limited | Information & communication | 2020 |
| Compass Informatics UK Limited | Information & communication | 2012 |
| Compass Live Art Limited | Arts & recreation | 2014 |
| Compass Martial Arts Ltd | Administrative & support | 2022 |
| Compass Merchandise and Events Ltd | Administrative & support | 2022 |
| Compass Properties (Leeds) LLP | | 2007 |
| Compass Security Innovations Limited | Administrative & support | 2005 |
| Compassionate Kitchen Ltd | Manufacturing | 2020 |
| Compassionateway Care Limited | Health & social care | 2026 |
| Competent Care Service Limited | Health & social care | 2023 |
| Compl - EAT Global Limited | Wholesale & retail | 2014 |
| Complete Care Agency Limited | Health & social care | 2009 |
| Complete Computer Systems Limited | Information & communication | 2003 |
| Complete Construction & Design Limited | Construction | 2020 |
| Complete Contemporary Care.Triple "C". Ltd. | Health & social care | 2013 |
| Complete CPM Limited | Administrative & support | 2013 |
| Complete Electrical & Datacom Installations Ltd | Information & communication | 1995 |
| Complete Fashions Limited | Wholesale & retail | 2013 |
| Complete Lets Limited | Real estate | 2004 |
| Complete Meica Ltd | Professional & scientific | 2023 |
| Complete Quality Engineering Limited | Information & communication | 2016 |
| Complete Scaffolding Yorkshire Ltd | Construction | 2022 |
| Complete Sign Illumination Ltd | Wholesale & retail | 2015 |
| Complete Staffing Solutions Ltd | Administrative & support | 2018 |
| Complete Talent Services Limited | Administrative & support | 2023 |
| Complete Tech Systems Limited | Information & communication | 2019 |
| Complete Woman CIC | Education | 2018 |
| Completestar Limited | Professional & scientific | 2004 |
| Complex Display Limited | Construction | 2025 |
| Complexia Limited | Manufacturing | 2006 |
| Compliance Compendium Limited | Information & communication | 2017 |
| Compliance Studio Limited | Information & communication | 2015 |
| Compliant Plus Ltd | Professional & scientific | 2018 |
| Complify UK Software and Technology Ltd | Education | 2025 |
| Complyscan Ltd | Professional & scientific | 2025 |
| Composed Software Limited | Information & communication | 2011 |
| Composites People Ltd | Administrative & support | 2023 |
| Compserv Limited | Wholesale & retail | 2014 |
| Compton Store Leeds Limited | Wholesale & retail | 2024 |
| Compton Stores Limited | Wholesale & retail | 2019 |
| Compuserve Ltd | Information & communication | 2024 |
| Compute and Cultivate Ltd | Manufacturing | 2023 |
| Computecuk Ltd | Other services | 2019 |
| Computer & Technology Solutions Limited | Information & communication | 2005 |
| Computer Aided Management Services Limited | Information & communication | 1988 |
| Computer Assistance Limited | Information & communication | 2009 |
| Computerised Administration Systems International Limited | Professional & scientific | 2001 |
| Computers Rebooted Limited | Wholesale & retail | 2024 |
| Computime Holdings Limited | Financial services | 2022 |
| Computime Systems (UK) Limited | Administrative & support | 1996 |
| Computology Ltd | Information & communication | 2022 |
| Compvac Ltd | Wholesale & retail | 2012 |
| Coms 1 Limited | Information & communication | 2013 |
| Comsols Limited | Information & communication | 2004 |
| Comtech Designs Ltd | Professional & scientific | 2023 |
| Conben Properties Ltd | Real estate | 2026 |
| Concentrate Properties Ltd | Real estate | 2024 |
| Concept Apartments Management Company Limited | Households | 2004 |
| Concept Auto Body Work Ltd | Manufacturing | 2026 |
| Concept Business Group Limited | Administrative & support | 2007 |
| Concept Construction Leeds Ltd | Construction | 2021 |
| Concept Containment Designs Ltd. | Manufacturing | 1999 |
| Concept Electrical Designs Ltd | Manufacturing | 2025 |
| Concept III Textiles International Limited | Wholesale & retail | 1998 |
| Concept Property Group Ltd | Real estate | 2018 |
| Concept Real Estate UK Ltd | Real estate | 2023 |
| Concept Renovations Ltd | Construction | 2025 |
| Concept Special Risks Ltd | Financial services | 1969 |
| Concept Taverns Ltd | Hospitality | 2018 |
| Concept Taverns Services Ltd | Administrative & support | 2020 |
| Concert Bidco Limited | Financial services | 2020 |
| Concert Newco Limited | Financial services | 2021 |
| Concha Collective Ltd | Professional & scientific | 2025 |
| Concord London Tower Limited | Administrative & support | 2013 |
| Concord Street Management Company Limited | Real estate | 2003 |
| Concorde Company Solutions Limited | Professional & scientific | 2011 |
| CONCORDE1 Limited | Construction | 2016 |
| Concrete Sandwiches Ltd | Wholesale & retail | 2025 |
| Concrete Wakefield Limited | Wholesale & retail | 2009 |
| Condor Golf Ltd | Professional & scientific | 2017 |
| Coney Park Estates Limited | Real estate | 1986 |
| Coneymoor Motors Limited | Wholesale & retail | 1999 |
| Coneymoor Properties Ltd | Real estate | 2018 |
| Conezz Limited | Hospitality | 2026 |
| Confetti and Lace (Yorkshire) Ltd | Other services | 2017 |