| Contenlo Consulting Limited | Information & communication | 1997 |
| Continental Fabrications Ltd | Manufacturing | 2019 |
| Continental Huddersfield Ltd | Wholesale & retail | 2025 |
| Continental Sports Limited | Manufacturing | 1964 |
| Continental Wine & Food Limited | Manufacturing | 1960 |
| Continuum Advisors Limited | Professional & scientific | 2023 |
| Contour Agent Ltd | Information & communication | 2025 |
| Contract BED Supplies Ltd | Manufacturing | 2025 |
| Contract Clean Limited | Administrative & support | 2025 |
| Contract Controls (Instrumentation) Limited | | 1974 |
| Control Logic UK Limited | Professional & scientific | 2000 |
| Control Systems 21 Ltd | Manufacturing | 2021 |
| Cook's Quarters Ltd | Real estate | 2021 |
| Cookies and Co Ltd | Manufacturing | 2013 |
| Cookingcloud Ltd | Wholesale & retail | 2019 |
| Cool Hand Studios Limited | Information & communication | 2014 |
| Cool Shop Ltd | Wholesale & retail | 2025 |
| Cool Water Direct (Huddersfield) Ltd | Other services | 2014 |
| Cool Water Direct Limited | Administrative & support | 2002 |
| Cool Work Limited | Real estate | 2019 |
| Coolbattz Limited | Professional & scientific | 2021 |
| Cooldeals Trading Ltd | Wholesale & retail | 2024 |
| Coolhandstrading Ltd | Wholesale & retail | 2021 |
| Cooltemper Limited | Manufacturing | 2004 |
| Cooneys Ecom Store Ltd | Wholesale & retail | 2022 |
| Cooper & Neville Estates Limited | Real estate | 2021 |
| Cooper & Neville Properties Ltd | Real estate | 2016 |
| Cooper Building Services (Holmfirth) Ltd | Construction | 2021 |
| Cooper Darwin Ltd | Financial services | 2015 |
| Cooper Home Investments Limited | Real estate | 2023 |
| Copper Rose Beauty Ltd | Other services | 2019 |
| Copper Technology Limited | Wholesale & retail | 2007 |
| Coppy Lane Properties Limited | Real estate | 2019 |
| Core Hardware Limited | Wholesale & retail | 2007 |
| Core Supply Ltd | Education | 2015 |
| Coreed Limited | Education | 2019 |
| Coreedge Learning Ltd | Public administration | 2025 |
| Cork Tree Trading Ltd | Wholesale & retail | 2020 |
| Corletta Limited | Wholesale & retail | 2023 |
| Cormed Limited | Health & social care | 2017 |
| Cornerstone Developments Yorkshire Ltd | Construction | 2023 |
| Cornerstone Estate Agents (Yorkshire) Limited | Real estate | 2005 |
| Cornfields 2019 Limited | Education | 2019 |
| Cornfields Developments Limited | Real estate | 2024 |
| Corporal Property Investments Limited | Real estate | 2008 |
| Corporate Cottages Limited | Extraterritorial | 2023 |
| Corrado's Limited | Administrative & support | 2016 |
| Corretagem Limited | Transport & logistics | 2025 |
| Cortex Electrical Ltd | Construction | 2024 |
| Cosmaderm Limited | Health & social care | 2013 |
| Cosmesis Ltd | Health & social care | 2011 |
| Cosmia Festivals Ltd | Arts & recreation | 2019 |
| Cosmopro Ltd | Other services | 2017 |
| Cosmos Corporation Ltd | Health & social care | 2011 |
| Cosmos Engagement Ltd | Health & social care | 2017 |
| Costa Hand Ltd | Manufacturing | 2024 |
| Costcutter Burmantofts Ltd | Wholesale & retail | 2005 |
| Cosy Kitchen (Huddersfield) Ltd | Hospitality | 2021 |
| Cosy Kitchen Desserts Ltd | Hospitality | 2023 |
| Cote Wood Ltd | Real estate | 2024 |
| Coterie Property Limited | Real estate | 2021 |
| Cotewood House Holdings Ltd | Financial services | 2018 |
| Cotewood House Ltd | Health & social care | 2018 |
| Cotsfield Trading Company Limited | Professional & scientific | 1983 |
| Cotterills Construction Ltd | Construction | 2023 |
| Cotti London Ltd | Wholesale & retail | 2024 |
| Country Feast Ltd | Wholesale & retail | 2013 |
| Country Homes Group Limited | Real estate | 2022 |
| Country Homes Holdings Limited | Real estate | 2022 |
| County Homes Group Limited | Real estate | 2022 |
| Cour North Limited | Administrative & support | 2019 |
| Cousin DFS Ltd | Mining & quarrying | 2016 |
| Cova Mova Limited | Wholesale & retail | 2006 |
| Coverdale Construction Ltd | Construction | 2023 |
| Covers in UK Ltd | Wholesale & retail | 2019 |
| COW Close Caravan & Camping Limited | Hospitality | 2016 |
| COW Close Cottages Ltd | Hospitality | 2023 |
| COW Close Pods Ltd | Hospitality | 2021 |
| COW Shed Investments Limited | Financial services | 2023 |
| Cowan Analysts Limited | Professional & scientific | 2008 |
| Cowlersley Hand Car Wash Ltd | Other services | 2026 |
| Cowling Property Ventures Ltd | Real estate | 2026 |
| Cowshed Consultants Limited | Health & social care | 2015 |
| CP & GP Limited | Professional & scientific | 2015 |
| CP Business Development Limited | Professional & scientific | 2019 |
| CP Electrical Services Ltd | Construction | 2016 |
| CPA Enterprises (Midlands) Ltd | Financial services | 2025 |
| CPC Specialist Decorators Ltd | Construction | 2019 |
| CPD Online College Limited | Education | 2018 |
| CPG Medical Ltd | Health & social care | 2024 |
| CPH Air Ltd | Energy | 2020 |
| CPH Developments Ltd | Real estate | 2018 |
| CPH Properties Ltd | Construction | 2019 |
| CPI Homes Ltd | Construction | 2019 |
| CPI Lettings Ltd | Real estate | 2018 |
| CPL Site Services Ltd | Professional & scientific | 2023 |
| CPS Financial Solutions Limited | Financial services | 2005 |
| CPS Property Holdings Ltd | Real estate | 2019 |
| Cpxpert Ltd | Professional & scientific | 2019 |
| CQ Apartments Ltd | Real estate | 2025 |