| Coops.Cloud Ltd | Information & communication | 2022 |
| Cope & Timmins UK Limited | Manufacturing | 2009 |
| Copeland Bennett Ltd | Real estate | 2022 |
| Copeland Estates Ltd | Real estate | 2020 |
| Copmanthorpe Holdings Ltd | Real estate | 2025 |
| Copmanthorpe Mots Ltd | Wholesale & retail | 2015 |
| Copmanthorpe Pharmacy Limited | Wholesale & retail | 2010 |
| Copmanthorpe Sports Club Limited | Arts & recreation | 2016 |
| Copper Beeches Property Ltd | Real estate | 2025 |
| Copperfield Truro Management Company Limited | Households | 2015 |
| Coppergate Clinic (Formerly Face ETC) Ltd | Health & social care | 2004 |
| Coppergate Properties Limited | Real estate | 1983 |
| Copsonrae Consulting Ltd | Professional & scientific | 2025 |
| Copy Cars Limited | Wholesale & retail | 2010 |
| Corba Intl Limited | Wholesale & retail | 2024 |
| Corby Epworth Limited | Professional & scientific | 2014 |
| Cordale Investments Limited | Extraterritorial | 2013 |
| Cordero Marketing Limited | Professional & scientific | 2012 |
| Core Call Ltd | Administrative & support | 2026 |
| Core Case Management Ltd | Health & social care | 2021 |
| Core Groundworks (York) Ltd | Construction | 2019 |
| Core Measures Ltd | Administrative & support | 2023 |
| Core MSK Limited | Health & social care | 2023 |
| Core Prestige Ltd | Extraterritorial | 2024 |
| Core Security Solutions Yorkshire Ltd | Administrative & support | 2023 |
| Corebrand Design Ltd | Professional & scientific | 2007 |
| Corelli Sherborne Management Company Limited | Households | 2015 |
| Corking Wines Limited | Wholesale & retail | 2003 |
| Corkscrew Estates Ltd | Real estate | 2026 |
| Corkscrew Productions Ltd | Arts & recreation | 2023 |
| Corne & Plant (Southern) Limited | Real estate | 1979 |
| Cornelius Services Limited | Information & communication | 2020 |
| Corner Barber Ltd | Other services | 2022 |
| Corner Grill House Ltd | Hospitality | 2023 |
| Corners Warmers Limited | Manufacturing | 2017 |
| Corpex Group York Ltd | Administrative & support | 2016 |
| Corporate Business Loans Ltd | Financial services | 2016 |
| Corporate Company Secretaries Ltd | Administrative & support | 2006 |
| Corporate Development Solutions Limited | Administrative & support | 2014 |
| Corporate Safety Solutions Limited | Professional & scientific | 2000 |
| Corporate Stays Limited | Real estate | 2017 |
| Corps Consulting Limited | Professional & scientific | 2013 |
| Correct Steps Consultancy Ltd | Information & communication | 2018 |
| Corries Solicitors Limited | Professional & scientific | 2005 |
| Corrigan Pick Ltd | Real estate | 2019 |
| Cortech Holdings Limited | Manufacturing | 2020 |
| Cortex Consulting Services Limited | Professional & scientific | 2025 |
| Corulet Limited | Professional & scientific | 2019 |
| Corvus Solutions Ltd | Manufacturing | 2025 |
| Coseley New Village Management Company Limited | Households | 2023 |
| Cosham's Property Limited | Construction | 2020 |
| Cosig Ltd | Wholesale & retail | 2025 |
| Cosmetics Cluster UK Limited | Other services | 2020 |
| Costrafx Limited | Professional & scientific | 2013 |
| Cosy Cottage Skincare Limited | Manufacturing | 2022 |
| Cote Farm (Thackley) Management Company Limited | Households | 2019 |
| Coterminous CIC | Education | 2020 |
| Coton Park (Rugby) Management Company Limited | Real estate | 2018 |
| Cottage Farm (Easingwold) Management Company Ltd | Households | 2026 |
| Cottage Villa Limited | Real estate | 2015 |
| Cottonplant Ltd | Wholesale & retail | 2019 |
| Coulsy Limited | Construction | 2013 |
| Coultas Property Limited | Real estate | 2026 |
| Coulterpepper Limited | Administrative & support | 2006 |
| Coultura Limited | Wholesale & retail | 2020 |
| Council for British Archaeology(The) | Education | 1983 |
| Counter Interiors Ltd | Construction | 2014 |
| Counterpoint Strategic Limited | Professional & scientific | 2026 |
| Country Charles Logistics Ltd | Transport & logistics | 2025 |
| Country Gardens (York) Limited | Other services | 2006 |
| Country Stoves of Farndale Ltd | Construction | 2015 |
| Countryheart Investments Limited | Financial services | 2018 |
| County House Estate Ltd | Real estate | 2008 |
| Court Electrical Services (York) Ltd | Construction | 2014 |
| Court House Framers Ltd | Professional & scientific | 2020 |
| Court Sport Plus Limited | Construction | 2021 |
| Courts Properties Ltd | Real estate | 2019 |
| Couttie Construction Planning Solutions Limited | Professional & scientific | 2015 |
| Covailent Ltd | Professional & scientific | 2023 |
| Coveney Dental Ltd | Health & social care | 2025 |
| Covent Garden Entertainment Ltd | Arts & recreation | 2012 |
| Coventry Arena Parking Ltd | Real estate | 2011 |
| Coverbaloo Limited | Financial services | 2017 |
| Coversure Insurance Services (Yorks) Limited | Financial services | 2003 |
| COW to Curb Ltd | Wholesale & retail | 2025 |
| Cowling Swift & Kitchin Limited | Professional & scientific | 2012 |
| Cowlings Solicitors Limited | Professional & scientific | 2020 |
| Cowton Property Limited | Real estate | 2025 |
| Coxy Cars Limited | Wholesale & retail | 2023 |
| COY Scaffolding Ltd | Construction | 2022 |
| Cozy Decor Limited | Wholesale & retail | 2025 |
| CP Scaffolding Yorkshire Limited | Construction | 2024 |
| CPD Active Ltd | Education | 2025 |
| Cpnw Food and Catering Ltd | Administrative & support | 2015 |
| CPS Roofing York Ltd | Construction | 2023 |
| CR & J Piercy Ltd | Agriculture & fishing | 2006 |
| CR Content Influencer Ltd | Professional & scientific | 2023 |
| CR Group Ltd | Wholesale & retail | 2020 |
| CR8 Agency Limited | Professional & scientific | 2026 |
| Crackergroup Limited | Financial services | 2007 |