| Coach House (Chester) Limited | Hospitality | 2006 |
| Coach House Denture Clinic Limited | Health & social care | 2026 |
| Coach House Pianos Ltd | Other services | 2023 |
| Coachedbybee Ltd | Other services | 2025 |
| Coaches Voice Tours Limited | Administrative & support | 2021 |
| Coaches Voice UK Tours Limited | Administrative & support | 2021 |
| Coaching and Engineering Services Ltd | Arts & recreation | 2012 |
| COACHING4CALM Ltd | Administrative & support | 2022 |
| Coactive Physio Ltd | Other services | 2016 |
| Coastal Point Management Co Ltd | Real estate | 2005 |
| Cobalt Wealth Limited | Administrative & support | 2010 |
| Cobolt Electrical Ltd | Construction | 2023 |
| Coco BAO Labs Limited | Health & social care | 2025 |
| Cocobee Limited | Wholesale & retail | 2015 |
| Coconut Beauty Ltd | Wholesale & retail | 2020 |
| Cocoon One Ltd | Other services | 2023 |
| Cocopot Ltd | Administrative & support | 2019 |
| Code Puma Limited | Information & communication | 2016 |
| Code Republic Ltd | Education | 2018 |
| Codeguysuk Ltd | Information & communication | 2019 |
| Codelocksmiths Limited | Other services | 2021 |
| Codemasons Limited | Information & communication | 2007 |
| Codex Integrity Limited | Administrative & support | 2010 |
| Codvex Technologies Ltd | Information & communication | 2026 |
| Coffee and Donuts (Chester) Ltd | Hospitality | 2019 |
| Coffee Panna Ltd | Hospitality | 2012 |
| Coffvee Ltd | Wholesale & retail | 2023 |
| Cogent Breeding Limited | Agriculture & fishing | 1992 |
| Cogent Staffing Limited | Administrative & support | 2017 |
| Cognitech Systems Ltd | Information & communication | 2022 |
| Cohen Limited | Manufacturing | 2005 |
| Colefax Building RTM Company Ltd | Households | 2022 |
| Coleman Dynamics Ltd | Professional & scientific | 2025 |
| Coles Knapp Limited | Administrative & support | 2008 |
| Colin Roberts Plant Hire Limited | Construction | 2004 |
| Colin Spofforth Studio Limited | Information & communication | 2025 |
| Collab Carts Limited | Wholesale & retail | 2025 |
| Collabor Technologies Ltd | Information & communication | 2025 |
| Collabora Consulting Limited | Construction | 2012 |
| Collatia Ltd | Professional & scientific | 2019 |
| Collatia Partners Ltd | Professional & scientific | 2019 |
| Collective Flooring Ltd | Construction | 2021 |
| Collins Motor Care Limited | Administrative & support | 2011 |
| Collister (North West) Ltd | Administrative & support | 2007 |
| Collister Ltd | Administrative & support | 2011 |
| Colo Property Ltd | Real estate | 2019 |
| Colour Coatings Limited | Manufacturing | 1999 |
| Colourcos Consulting Ltd | Professional & scientific | 2022 |
| Colouru Ltd | Manufacturing | 2025 |
| Columbus Mckinnon Corporation Limited | Manufacturing | 1958 |
| Comigo Clothing Co. Ltd | Wholesale & retail | 2025 |
| Commercial Boat Services Ltd | Transport & logistics | 1997 |
| Commercial Energy Assessments Ltd | Professional & scientific | 2025 |
| Commfield Ltd | Wholesale & retail | 2024 |
| Commsbyjack Ltd | Administrative & support | 2025 |
| Commstek Ltd | Information & communication | 2018 |
| Communicateuk Ltd | Information & communication | 2018 |
| Communicorp UK Digital Investments Limited | Financial services | 2020 |
| Community and School Support Limited | Education | 2016 |
| Community Safety Partnerships Ltd | Professional & scientific | 2023 |
| Como Lake Marketing Partners Ltd | Wholesale & retail | 2020 |
| Company Carpi Create CIC | Education | 2026 |
| Company Secretary Services Limited | Administrative & support | 1984 |
| Comparitec Group Limited | Information & communication | 2020 |
| Compass Adventures Limited | Administrative & support | 2013 |
| Compass Agronomy Limited | Agriculture & fishing | 2020 |
| Complete Clearances (North West) Ltd | Water & waste | 2021 |
| Complete Driveways Ltd | Construction | 2025 |
| Complete Holiday Park Solutions Ltd | Hospitality | 2021 |
| Complete Network Solutions Limited | Extraterritorial | 2006 |
| Complete Vehicle Support Limited | Administrative & support | 2011 |
| Compliance Bear Limited | Professional & scientific | 2025 |
| Comprehensive Tax Planning Ltd | Professional & scientific | 2017 |
| Computer & Phone Repairs Ltd | Other services | 2019 |
| Comvergent Holdings Limited | Information & communication | 2013 |
| Conber Developments Limited | Construction | 2008 |
| Concise Translations Limited | Professional & scientific | 2008 |
| Concpt Ltd | Information & communication | 2021 |
| Coney Croft Management Company Limited | Households | 2018 |
| Conflux Alliance Ltd | Transport & logistics | 2026 |
| Connah-Kakoty Ltd | Real estate | 2025 |
| Connect Radio Limited | Information & communication | 2009 |
| Connect Recruit Ltd | Other services | 2012 |
| Connect Talent Group Ltd | Administrative & support | 2026 |
| Connections Family Assessment Services Ltd | Health & social care | 2022 |
| Connex Education Academy Limited | Information & communication | 2016 |
| Connex Education Partnership Birmingham Limited | Education | 2021 |
| Connex Education Partnership Bristol Limited | Education | 2018 |
| Connex Education Partnership Cardiff Limited | Administrative & support | 2010 |
| Connex Education Partnership Derby Limited | Administrative & support | 2016 |
| Connex Education Partnership Leicester Limited | Administrative & support | 2018 |
| Connex Education Partnership Limited | Administrative & support | 2016 |
| Connex Education Partnership Liverpool Limited | Education | 2018 |
| Connex Education Partnership Manchester Limited | Administrative & support | 2017 |
| Connex Education Partnership North East Limited | Education | 2021 |
| Connex Education Partnership Nottingham Limited | Education | 2018 |
| Connex Education Partnership Warrington Limited | Education | 2018 |
| Connex Solutions Limited | Administrative & support | 2016 |
| Connor Health & Safety Ltd | Professional & scientific | 2024 |
| Connors Visuals Limited | Professional & scientific | 2024 |