| C.O.G Scaffolding Services Ltd | Construction | 2022 |
| Calypso Media Limited | Professional & scientific | 2023 |
| Campeys Group Limited | Financial services | 2023 |
| Campeys of Selby Limited | Transport & logistics | 2004 |
| Canine Team Ltd | Administrative & support | 2021 |
| Careline Security Limited | Administrative & support | 2010 |
| CARER4CARE Limited | Health & social care | 2021 |
| Carol Saunders Swim School (Franchise) Limited | Education | 2016 |
| Carowebb Limited | Hospitality | 2025 |
| Carrwood House Dental Limited | Health & social care | 2024 |
| Casselden & Walsh Funeral Directors Limited | Other services | 2022 |
| Cawood Castle Inn Ltd | Hospitality | 2025 |
| CBT Network Consulting Limited | Information & communication | 2018 |
| Cctv Drainage Investigations Limited | Administrative & support | 2014 |
| CDC Training Consultants Limited | Professional & scientific | 2015 |
| Celebrate Moments Limited | Wholesale & retail | 2024 |
| Celebrate With RIA Ltd | Other services | 2023 |
| Celebration Holiday Homes Ltd | Hospitality | 2020 |
| Central Cylinder Testing Limited | Manufacturing | 2022 |
| Central Service Developers Limited | Construction | 2005 |
| Central Studios Selby Limited | Other services | 2025 |
| Centre of Business Limited | Administrative & support | 2019 |
| Cerealia Ltd | Construction | 2010 |
| Cerritos Limited | Information & communication | 2013 |
| CFA Tax Limited | Professional & scientific | 2019 |
| CG Film Productions Limited | Information & communication | 2021 |
| CG Plumbing & Home Services Ltd | Construction | 2015 |
| CGH Builders Limited | Construction | 2014 |
| CGS Direct Ltd | Wholesale & retail | 2024 |
| Chance Properties Ltd | Real estate | 2018 |
| Channel Healthcare Ltd | Wholesale & retail | 2017 |
| Chapel Close Management Company Limited | Households | 2016 |
| Charcuterie Solutions Limited | Manufacturing | 2026 |
| Charles and Wesley Accountancy Services Limited | Professional & scientific | 2017 |
| Charles Makin Limited | Agriculture & fishing | 1997 |
| Charlotte Rose Allen Consulting Limited | Professional & scientific | 2024 |
| Chartered Professional Services Ltd | Construction | 2018 |
| Cherry Blossom Island Ltd | Health & social care | 2025 |
| Cherry Blossom Stables Ltd | Arts & recreation | 2018 |
| Chestnut Properties (Smales) Limited | Real estate | 2021 |
| Chloe’S Table Ltd | Hospitality | 2019 |
| Chocolotte Ltd | Hospitality | 2025 |
| CHT Training Group Ltd | Education | 2020 |
| Chudleigh Farming Limited | Agriculture & fishing | 2007 |
| Church View (Hemingbrough) Management Company Limited | Households | 2005 |
| Cider House Film Completion Limited | Information & communication | 2013 |
| Cinda Clothing Limited | Wholesale & retail | 2014 |
| Cinnamon HR Ltd | Hospitality | 2025 |
| City Builders (Northern) Limited | Construction | 1996 |
| City West Flooring Ltd | Construction | 2022 |
| City West Leisure Ltd | Hospitality | 2020 |
| City West Project Design & Consultants Limited | Construction | 2013 |
| City West Scaffolding Ltd | Construction | 2024 |
| CJ Construction (UK) Ltd | Construction | 2008 |
| CJB Clothing Limited | Wholesale & retail | 2023 |
| Cjwestates Ltd | Real estate | 2024 |
| Cksm Limited | Wholesale & retail | 2022 |
| CLA Consultant Ltd | Administrative & support | 2023 |
| Clarke's Plumbing Services Limited | Construction | 2012 |
| Classguild (UK) Limited | Professional & scientific | 2012 |
| Classic Upholstery Limited | Other services | 2017 |
| Classroom Clothing Limited | Wholesale & retail | 2009 |
| Clay Experiential Ltd | Administrative & support | 2022 |
| Clearview (Yorks) Limited | Administrative & support | 2014 |
| Click Sales & Lettings Ltd | Real estate | 2022 |
| Cliff Consultancy Ltd | Information & communication | 2025 |
| Cliffe Meadows Holiday Park Limited | Hospitality | 2021 |
| Cliffe Meadows Touring Limited | Hospitality | 2023 |
| Clifton Dental Practice Limited | Health & social care | 2008 |
| Cloudidm Ltd | Information & communication | 2020 |
| Clover 4596 Limited | Hospitality | 2021 |
| Clowrey & Sons Health and Safety Limited | Health & social care | 2022 |
| CMJ Kingspools Ltd | Construction | 2019 |
| CNJ Properties Limited | Construction | 2006 |
| Cobble Retreats Limited | Real estate | 2021 |
| Cobra Consultancy Group Limited | Professional & scientific | 2024 |
| Coffee ZU Ltd | Hospitality | 2023 |
| Cohesion Labs Ltd | Professional & scientific | 2022 |
| Colewise Limited | Real estate | 2024 |
| College Construction Limited | Professional & scientific | 1982 |
| Colour With Addy Ltd | Professional & scientific | 2026 |
| Companion Cremations Ltd | Other services | 2026 |
| Complexas Data Services Ltd | Professional & scientific | 2013 |
| Complexas Holdings Ltd | Financial services | 2025 |
| Complexas Investments Ltd | Financial services | 2025 |
| Comus Inn Selby Limited | Hospitality | 2024 |
| Condor Aviation Skybikes Limited | Manufacturing | 2022 |
| Condor Engineering Group Limited | Manufacturing | 2001 |
| Connaught Construction Group Limited | Construction | 2023 |
| Connect Manufacturing Ltd | Professional & scientific | 2026 |
| Constant Power Solutions Ltd | Manufacturing | 2013 |
| Control Property Investments Limited | Real estate | 2024 |
| Control Software Limited | Information & communication | 2018 |
| Cook Everyday Ltd | Hospitality | 2017 |
| Coolbreeze (Yorkshire) Limited | Construction | 2026 |
| Copeland Motors Limited | Wholesale & retail | 2007 |
| Copliant Ltd | Information & communication | 2025 |
| Copmanthorpe Limited | Real estate | 2024 |
| Copperfields Consulting Limited | Manufacturing | 2013 |
| Coral Engineering Ltd | Construction | 2020 |