| Castle Pizza Ltd | Hospitality | 2024 |
| Castle Sunset Ltd | Real estate | 2022 |
| Catfoss Group Holdings Limited | Professional & scientific | 2013 |
| Catfoss Renewable Energy Limited | Extraterritorial | 2018 |
| Catfoss Renewables Ltd | Professional & scientific | 2014 |
| Cati Fire & Security Ltd | Administrative & support | 2024 |
| Cave Street Fisheries Ltd | Hospitality | 2003 |
| Caveman Barbers Ltd | Other services | 2017 |
| Cavendish Hale Ltd | Arts & recreation | 2019 |
| Cavendish Meadows Management Company Ltd | Households | 2020 |
| CB Media and Marketing Ltd | Professional & scientific | 2025 |
| CBA (Accountants) Limited | Professional & scientific | 2003 |
| CBF Property Ltd | Real estate | 2025 |
| CBM Associates Consulting Limited | Transport & logistics | 2005 |
| CC Motor Engineers Ltd | Wholesale & retail | 2015 |
| CCE Lettings Limited | Real estate | 2020 |
| CE Finance (Beverley) Limited | Administrative & support | 2002 |
| CE Services Yorkshire Limited | Construction | 2017 |
| CE the Future Ltd | Professional & scientific | 2025 |
| Ce&L Limited | Manufacturing | 2014 |
| Centurion Coating Supplies Ltd | Wholesale & retail | 2019 |
| Century Developments Limited | Construction | 2002 |
| Cephas Valves & Controls Ltd | Wholesale & retail | 2014 |
| Ceramic Tile Merchants Limited | Wholesale & retail | 2003 |
| Ceramic Tile Subco Limited | Extraterritorial | 2011 |
| Cert Energy Ltd | Water & waste | 2024 |
| Cerutti 2 Limited | Hospitality | 1988 |
| Cerutti's Limited | Hospitality | 1974 |
| CGS Roofing Limited | Construction | 2025 |
| CH Counselling Ltd | Health & social care | 2017 |
| CH Training Limited | Professional & scientific | 2005 |
| Chadwick Construction Limited | Construction | 2021 |
| Challenger Agri (UK) Limited | Wholesale & retail | 2009 |
| Chapter Healthcare Ltd | Health & social care | 2024 |
| Charles Hyde & SON Limited | Wholesale & retail | 1967 |
| Chas. D. Pullan & SON Limited | Manufacturing | 1999 |
| Chbg Properties Limited | Real estate | 1999 |
| Checked Ltd | Professional & scientific | 2019 |
| Chemtech Consultant Limited | Professional & scientific | 2008 |
| Cherry Blossom Hill (Bridlington) Management Ltd | Households | 2021 |
| Cherry Garth Cottingham Limited | Hospitality | 1985 |
| Cherry Windows & Doors Ltd | Construction | 2020 |
| Chestnut Gardening Services Ltd | Administrative & support | 2019 |
| Chetter Limited | Health & social care | 2019 |
| Chiaro Limited | Real estate | 2025 |
| Chilli Water Ltd | Administrative & support | 2012 |
| Chris Andrews Limited | Construction | 2003 |
| Chris Gibson Mobile DJ Ltd | Arts & recreation | 2022 |
| Christian Derrick Financial Planning Limited | Financial services | 2018 |
| Christie Engineering Services Ltd | Professional & scientific | 2019 |
| Christopha's Limited | Other services | 2004 |
| Christopher Group Ltd | Financial services | 2022 |
| Chrome Finish Limited | Construction | 2015 |
| Chrylec Limited | Professional & scientific | 2010 |
| Chums Cafe Limited | Hospitality | 2023 |
| Church Drive Management Company Limited | Households | 1980 |
| Church Farm Sandhutton Management Company Ltd | Households | 2024 |
| Church Fields (Kirk Sandall) Management Company Limited | Households | 2004 |
| Ciao (Beverley) Ltd | Hospitality | 2020 |
| Cinsano Wind Ltd | Manufacturing | 2025 |
| Circe Ltd | Construction | 2012 |
| Citco Investments Ltd | Real estate | 2014 |
| Citco Properties Limited | Real estate | 1994 |
| City Culture Limited | Construction | 2013 |
| Cityworth Limited | Other services | 1979 |
| CK Arrhythmics Limited | Health & social care | 2017 |
| CK Barrett Limited | Other services | 2014 |
| CLA Properties Ltd | Real estate | 2023 |
| Claire Scott Designs Ltd | Professional & scientific | 2002 |
| Clarence Snooker Club Limited | Arts & recreation | 2001 |
| Clark & HAY Ltd | Construction | 2012 |
| Clark & HAY Properties Limited | Real estate | 2017 |
| Clark Speed Limited | Administrative & support | 2010 |
| Clarke & Family Limited | Professional & scientific | 2023 |
| Clarkes of Yorkshire Ltd | Professional & scientific | 2024 |
| Claroflow Ltd | Construction | 2026 |
| Classic Decorating (Yorkshire) Limited | Construction | 2009 |
| Clean Future Innovation Exchange Limited | Professional & scientific | 2025 |
| Cleancap Engineering Services Ltd | Professional & scientific | 2023 |
| Cleanmequick Limited | Administrative & support | 2019 |
| Clear Choice Plumbing Ltd | Construction | 2022 |
| Clear Strip UK Limited | Construction | 2026 |
| Clearteq Energy Limited | Construction | 2015 |
| Clearview Fire and Security Ltd | Public administration | 2022 |
| Cleverclogs Multimedia Ltd | Information & communication | 2017 |
| Clickhood Ltd | Wholesale & retail | 2025 |
| Climatesi Limited | Information & communication | 2024 |
| Clinical Operation Pharma Services Limited | Health & social care | 2022 |
| CLL2 Ltd | Wholesale & retail | 2022 |
| Close Innovations Limited | Wholesale & retail | 2025 |
| Closer Healthcare Limited | Health & social care | 2011 |
| Club Hospitality's Limited | Hospitality | 2012 |
| Clubhouse Nico Ltd | Other services | 2024 |
| CMH Engineering Limited | Professional & scientific | 2025 |
| CMO Electrical Solutions Ltd | Manufacturing | 2021 |
| Cmrp Technical Services Limited | Professional & scientific | 2020 |
| CN Animal Health Ltd | Professional & scientific | 2026 |
| Coast and Castle Properties Limited | Real estate | 2017 |
| Coastal Care Healthcare Limited | Health & social care | 2026 |
| Coastline Leisure Limited | Wholesale & retail | 2004 |