| Consultants Like US Ltd | Information & communication | 2020 |
| Consulting Cosmos Limited | Information & communication | 2018 |
| Consultingopedia Ltd | Information & communication | 2023 |
| Consulttech Ltd | Wholesale & retail | 2025 |
| Consumer Credit Counselling Service (Equity Release) Limited | Financial services | 2008 |
| Consumer Credit Counselling Service Limited | Financial services | 1996 |
| Consumer Credit Counselling Service Voluntary Arrangements Limited | Financial services | 2005 |
| Consumer Debt Legal Services Limited | Administrative & support | 2013 |
| Contact Centre UK Ltd | Health & social care | 2024 |
| Contact Consulting Limited | Information & communication | 2007 |
| CONTACT25 Limited | Information & communication | 2004 |
| Contain a Curl Ltd | Other services | 2023 |
| Container Cities UK Limited | Transport & logistics | 2021 |
| Container Studio Limited | Hospitality | 2016 |
| Contandown Limited | | 1952 |
| Contec Cleanroom (UK) Limited | Administrative & support | 2013 |
| Conteh Limited | Transport & logistics | 2018 |
| Contemporary Aesthetics Limited | Health & social care | 2018 |
| Contemporary Investment & Development Ltd | Construction | 2022 |
| Contemporary Plumbing Solutions Limited | Wholesale & retail | 2007 |
| Content Plumbing and Heating Limited | Administrative & support | 2015 |
| Content Soup Limited | Professional & scientific | 2013 |
| Content Studio Limited | Professional & scientific | 2011 |
| Contentable Limited | Professional & scientific | 2015 |
| Contilinks CI Ltd | Manufacturing | 2017 |
| Continental Link Traders Ltd | Wholesale & retail | 2023 |
| Continuous Property Ltd | Real estate | 2015 |
| Continuum Aids C.I.C. | Manufacturing | 2025 |
| Continuum Projects Ltd | Real estate | 2022 |
| Contra Padel Limited | Wholesale & retail | 2025 |
| Contract Appliances Limited | Transport & logistics | 1976 |
| Contract Experts Limited | Real estate | 1989 |
| Contract Furniture Manufacturing Ltd | Manufacturing | 2019 |
| Contract Plumbing Solutions Limited | Construction | 2009 |
| Contract Risks Management Limited | Professional & scientific | 2024 |
| Contract Scaffolding Yorkshire Limited | Construction | 2014 |
| Contract UK Staffing Solutions Ltd | Administrative & support | 2015 |
| Contract Vehicles Fleet Services Limited | Administrative & support | 2020 |
| Contract Vehicles Limited | Administrative & support | 1963 |
| Contract Vehicles Properties Limited | Other services | 2020 |
| Contract Vehicles Rentals Limited | Administrative & support | 2020 |
| Contractor Concierge Limited | Administrative & support | 2021 |
| Contractorco Limited | Administrative & support | 2020 |
| Contractorco Property Limited | Real estate | 2023 |
| Contractors Facilities Limited | Professional & scientific | 1971 |
| Control & Power Systems Services Ltd | Professional & scientific | 2025 |
| Control Finance Ltd | Professional & scientific | 2026 |
| Control Fire Ltd | Construction | 2022 |
| Control Instruments Limited | Manufacturing | 2005 |
| Control Station Limited | Manufacturing | 2012 |
| Control System Realisation Limited | Construction | 2005 |
| Controlled Space Limited | Arts & recreation | 2002 |
| Convenience Stores UK (Lowedges) Ltd | Wholesale & retail | 2026 |
| Converged Technology Solutions Ltd | Information & communication | 2018 |
| Conversion by Team Ltd | Manufacturing | 2026 |
| Conversionhubs Ltd | Professional & scientific | 2021 |
| CONVERT2CASH (Leeds) Limited | Wholesale & retail | 2012 |
| CONVERT4LESS Ltd | Construction | 2018 |
| Convertsense Ltd | Professional & scientific | 2024 |
| Conveyancinghome Limited | Professional & scientific | 2023 |
| Conway Partnership Ltd. | Health & social care | 2009 |
| Cook & Cook Group Limited | Professional & scientific | 2002 |
| Cook & Lucas Frozen (Holdings) Limited | Wholesale & retail | 2016 |
| Cook & Lucas Frozen (UK) Limited | Wholesale & retail | 2007 |
| Cooke Sports Medicine & Performance Ltd | Health & social care | 2025 |
| Cookridge Estates LLP | | 2013 |
| Cookridge Hall Golf Club (Leeds) Limited | Arts & recreation | 2021 |
| Cookridge Hall Golf Club Limited | Arts & recreation | 2004 |
| Cookridge Retail Developments Limited | Real estate | 2023 |
| Cookridge Windows Ltd | Construction | 2013 |
| Cooks Racking Services Ltd | Manufacturing | 2022 |
| Cookson Consulting Ltd | Information & communication | 2009 |
| Cookson D & C Ltd | Construction | 2021 |
| Cool Cats Ice Co Limited | Wholesale & retail | 2022 |
| Cool Creations Carpentry Ltd | Manufacturing | 2022 |
| Cool Cuts (Leeds) Ltd | Other services | 2023 |
| Cool Gell Limited | Manufacturing | 1999 |
| Cool Solutions Applied Heat Ltd | Extraterritorial | 2023 |
| Cool Solutions Distribution Limited | Energy | 2005 |
| Coolblue Clothing Ltd | Wholesale & retail | 2025 |
| Coolcare Limited | Information & communication | 1997 |
| Coollook Limited | Financial services | 2012 |
| Coolthingz Ltd | Wholesale & retail | 2022 |
| Cooltrade Ltd | Wholesale & retail | 2018 |
| Coolvast Limited | Professional & scientific | 1990 |
| Cooper COR Ltd | Professional & scientific | 2022 |
| Cooper Electrical Design Services Ltd | Construction | 2011 |
| Cooper Limon Limited | Professional & scientific | 2006 |
| Cooper Morris Ltd | Professional & scientific | 2014 |
| Cooper Ross Limited | Hospitality | 2015 |
| Cooper's Groceries Ltd | Wholesale & retail | 2022 |
| Coopers Maintenance Limited | Administrative & support | 2012 |
| Coopers of Beeston,Limited | Real estate | 1937 |
| Coordinate Saas Limited | Information & communication | 2016 |
| Coordinate Sport Limited | Financial services | 2025 |
| Cootech Ltd | Information & communication | 2021 |
| Copa Summit Limited | Arts & recreation | 2014 |
| Copave Int'L - Community Partners for the Vulnerable & Excluded Ltd | Information & communication | 2025 |
| Copeland & Belle Ltd | Real estate | 2024 |
| Copeland Auto Repair Services Limited | Wholesale & retail | 2003 |