| Credico Holdings Limited | Professional & scientific | 2015 |
| Credico Limited | Administrative & support | 2005 |
| Credico Marketing Limited | Professional & scientific | 2007 |
| Credit Solutions International Limited | Financial services | 2008 |
| Creditec Limited | Information & communication | 2021 |
| Credos (UK) Limited | Extraterritorial | 1992 |
| Cremdella Limited | Wholesale & retail | 2021 |
| Crescendo Communications Limited | Professional & scientific | 2008 |
| Crest Five Limited | Real estate | 2026 |
| Cria Construction Limited | Construction | 2016 |
| Crickhowell Properties (Wales) Limited | Real estate | 1992 |
| Crimson Technology Consulting Ltd | Information & communication | 2024 |
| Critical Vector Consulting Ltd | Information & communication | 2020 |
| Crocky Trail Limited | Arts & recreation | 2001 |
| Croft & Croft Limited | Construction | 2007 |
| Croft Holdings (Calveley) Limited | Construction | 2022 |
| Croft Holdings (Calveley) Management Limited | Households | 2026 |
| Crogen Holdings Ltd | Financial services | 2021 |
| Crogen Investments Ltd | Financial services | 2021 |
| Crogen Sporting LLP | | 2023 |
| Cromwell Storage Ltd | Real estate | 2021 |
| Cross Border Communications UK Ltd | Information & communication | 1993 |
| Cross Border Fire Solutions Limited | Public administration | 2019 |
| Cross Border Media Ltd | Information & communication | 2022 |
| Cross Lanes Classic Cars Ltd | Wholesale & retail | 2024 |
| Cross Lanes Classics Limited | Wholesale & retail | 2020 |
| Crossford Construction Ltd | Construction | 2018 |
| Crossland Holdings Ltd | Financial services | 2022 |
| Crossland Properties Limited | Real estate | 2018 |
| Crosslink Development Limited | Other services | 1999 |
| Crossways Asset Solutions LLP | | 2010 |
| Croston Engineering (EOT) Limited | Administrative & support | 2023 |
| Crouch & Co Investments Ltd | Professional & scientific | 2022 |
| Crowdfarming Limited | Wholesale & retail | 2019 |
| Crown Accommodation Services Limited | Real estate | 2008 |
| Crown Business Communications Limited | Other services | 1993 |
| Crown Park Computing Ltd | Information & communication | 2019 |
| Crownshield Security Services Ltd | Financial services | 2019 |
| Crumpet Moon Ltd | Information & communication | 2016 |
| Crunchicks Ltd | Hospitality | 2023 |
| Crustum Limited | Hospitality | 2020 |
| Crwti Limited | Information & communication | 2022 |
| Crystal Beads Design Limited | Wholesale & retail | 2025 |
| Crystal Clarity Medical Limited | Health & social care | 2019 |
| CS Coffee Ltd | Hospitality | 2021 |
| CS2U Limited | Information & communication | 2006 |
| CSB Meddent Limited | Health & social care | 2025 |
| Cscc Limited | Transport & logistics | 2016 |
| Csch Property Ltd | Households | 2020 |
| CSL Chester Services Ltd | Wholesale & retail | 2022 |
| Csmc Ventures Limited | Information & communication | 2023 |
| CSO Capital Ltd. | Financial services | 2021 |
| CSO Investments Limited | Real estate | 2025 |
| CSP Audio Visual Limited | Administrative & support | 1992 |
| Csphysiotherapy Limited | Health & social care | 2013 |
| CSR Cheshire Ltd | Real estate | 2022 |
| CST Marketing Management Limited | Professional & scientific | 2008 |
| CT28 Productions Ltd | Professional & scientific | 2023 |
| Ctak Services Limited | Health & social care | 2021 |
| CTP (Wakefield) Limited | Construction | 1992 |
| Ctpm Limited | Real estate | 2009 |
| Cube Consulting & Resourcing Ltd | Administrative & support | 2015 |
| Cubiq Recruitment Limited | Professional & scientific | 2010 |
| Cuckoo`S Nest (Chester) Management Company Limited | Households | 2008 |
| Cuddington PP Ltd | Construction | 2021 |
| CUE Collective Ltd | Professional & scientific | 2026 |
| CUE Technologies Limited | Information & communication | 2022 |
| Cuebrook Ltd | Administrative & support | 2015 |
| Cullimore Dutton Solicitors Limited | Professional & scientific | 2014 |
| Cultural Exchange Lingua Limited | Education | 2025 |
| Cummins Financial Advisers Limited | Financial services | 2002 |
| Cuppin House Limited | Real estate | 2024 |
| Curad Netsecure Ltd | Information & communication | 2024 |
| Curated Frames Ltd | Professional & scientific | 2020 |
| Curlysoo Enterprises Ltd | Wholesale & retail | 2020 |
| Currans Homes Limited | Real estate | 2004 |
| Currans NW Limited | Real estate | 2020 |
| Currans Property Group Ltd | Financial services | 2024 |
| Currans Property Limited | Real estate | 2016 |
| Curtains by Design Limited | Wholesale & retail | 2007 |
| Curvebeam AI UK Limited | Wholesale & retail | 2022 |
| Curzon Park Developments Ltd | Construction | 2020 |
| Curzon Property Group Ltd | Real estate | 2025 |
| Curzon Property Holdings Ltd | Real estate | 2026 |
| Custard-Pies PCP Ltd. | Construction | 1998 |
| Custom Property Maintenance NW Limited | Construction | 2018 |
| Customer Experience Consultancy Ltd | Professional & scientific | 2012 |
| Customsplus Limited | Information & communication | 2019 |
| Cutlass Technologies Limited | Professional & scientific | 2000 |
| Cutler & Evans Ltd | Construction | 2020 |
| CWC Group Resource Ltd | Other services | 2025 |
| Cwgordon Company Ltd | Real estate | 2016 |
| Cwtb | Other services | 2004 |
| Cyberiam Holdings Limited | Information & communication | 2017 |
| Cygnet Close Management Company Limited | Professional & scientific | 1990 |
| Cyla Research CIC | Information & communication | 2026 |
| Cynergy Cleaning Solutions (NW) Ltd | Administrative & support | 2021 |
| Cynergy Cleaning Solutions Limited | Administrative & support | 2020 |
| Cynergy Events Security Limited | Administrative & support | 2018 |
| Cynergy Security (NW) Limited | Administrative & support | 2020 |