| Cornwell Agency Limited | Administrative & support | 2002 |
| Coronation Ventures Ltd | Real estate | 2026 |
| Corporate Governance Unbound Limited | Professional & scientific | 2026 |
| Corporate Mobile Recycling Limited | Wholesale & retail | 2002 |
| Corporate Safeguarding Ltd | Other services | 2018 |
| Correct-Line Ltd | Administrative & support | 2013 |
| Corvin Facades Group Ltd | Construction | 2026 |
| Corvin Facades Ltd | Construction | 2022 |
| Coserve Solutions Limited | Information & communication | 2018 |
| Cosh Solutions Ltd | Information & communication | 2026 |
| Coskun Group Ltd | Professional & scientific | 2018 |
| Cosmo Cocktails Ltd | Other services | 2020 |
| Cosmos Afro Caribbean Hair Salon Ltd | Other services | 2024 |
| Costy Solutions Limited | Transport & logistics | 2019 |
| Cotton Candy Management Ltd | Information & communication | 2022 |
| Cottrell's Exterior Services Ltd | Administrative & support | 2024 |
| Coullweb Ltd | Information & communication | 2015 |
| Counting Back Productions Limited | Information & communication | 2016 |
| Countrywise Developments Limited | | 1989 |
| County Douglas Law Limited | Professional & scientific | 2013 |
| County Douglas Ltd | Professional & scientific | 2020 |
| County Wills & Probate Willcare Limited | Professional & scientific | 2002 |
| County Wills Reading Limited | Other services | 2002 |
| County Wills Willcare Limited | Professional & scientific | 2013 |
| Court Drove Holdings Ltd | Financial services | 2024 |
| Courtdrift Limited | Real estate | 1997 |
| Cove View Limited | Hospitality | 2022 |
| Coveney Car & Commercial Limited | Wholesale & retail | 2016 |
| Cover-Up Designs Limited | Manufacturing | 1987 |
| Covington Enterprises Ltd | Wholesale & retail | 2021 |
| Cowderydown Homes LLP | | 2023 |
| COX Metal Roofing Ltd | Construction | 2023 |
| Cozy Caregiver Limited | Administrative & support | 2025 |
| CPS Group Support Ltd | Professional & scientific | 2023 |
| CPS International Holdings Ltd | Professional & scientific | 2021 |
| CPS Service and Support Ltd | Administrative & support | 2023 |
| CPS Services Limited | Construction | 2000 |
| CPS Stockco Ltd | Administrative & support | 2023 |
| CR Crystal Clean Ltd | Administrative & support | 2026 |
| Cr&Mo Partners Ltd | Administrative & support | 2025 |
| Crabbet One Limited | Real estate | 2025 |
| Crabbet Two Limited | Real estate | 2025 |
| Crabtree Investments Limited | Real estate | 2002 |
| Craft Kits N Bits Ltd | Wholesale & retail | 2020 |
| Crane Commercial Interiors Ltd | Construction | 2010 |
| Cranleys Capital Limited | Real estate | 2024 |
| Cranleys Commercial Limited | Hospitality | 2021 |
| Cranleys Legal Limited | Extraterritorial | 2006 |
| Cranleys Partnership LLP | | 2010 |
| Cranleys Staffing Limited | Administrative & support | 2009 |
| Craven Property Portfolio Ltd | Real estate | 2022 |
| Crayside Consulting Limited | Professional & scientific | 2006 |
| Crayside Critical Projects Limited | Construction | 2023 |
| CRE8 AV Limited | Administrative & support | 2011 |
| Create Consultancy and IT Solutions Limited | Administrative & support | 2024 |
| Create Workjoy Ltd | Administrative & support | 2017 |
| Creative Art Classes Limited | Education | 2024 |
| Creative Build Solutions Limited | Construction | 2005 |
| Creative Business Technologies Ltd | Information & communication | 2007 |
| Creative Craft Design Ltd | Information & communication | 2019 |
| Credence Solutions Ltd. | Information & communication | 2017 |
| Credit Link Account Recovery Solutions Limited | Administrative & support | 2001 |
| Creighton Materials Handling Limited | Extraterritorial | 1950 |
| Crescent API Limited | Manufacturing | 2012 |
| Crescent Manufacturing Limited | Manufacturing | 2015 |
| Crescent Medical UK Limited | Manufacturing | 2014 |
| Crescent Pharma Limited | Manufacturing | 2003 |
| Crescent Pharma OTC Limited | Wholesale & retail | 2000 |
| Crescent Pharmaceuticals Limited | Financial services | 2010 |
| Crest Education Academy Ltd | Education | 2025 |
| Crest Sovereign (Brooklands) LLP | | 2019 |
| Crestwood Bespoke Kitchens Ltd | Construction | 2026 |
| Crewbelts Limited | Manufacturing | 2025 |
| Crio Digital Ltd | Professional & scientific | 2021 |
| Cripps-Wood Consulting Ltd | Information & communication | 2012 |
| Crisp Scenery Limited | Arts & recreation | 2023 |
| Crispclean Limited | Administrative & support | 2000 |
| Crispin Homes Limited | Health & social care | 1991 |
| Cromwell Flats Limited | Professional & scientific | 2019 |
| Cromwell Inn Ltd | Hospitality | 2019 |
| Croombs Electrical Services Ltd | Construction | 1989 |
| Cross Electrical Limited | Construction | 2011 |
| Cross Social Media Solutions Ltd | Professional & scientific | 2023 |
| Cross Sport Ltd | Arts & recreation | 2004 |
| Crossco (1341) Limited | Professional & scientific | 2013 |
| Crossfit Basingstoke Ltd | Arts & recreation | 2013 |
| Crossfit Revival Basingstoke Ltd | Arts & recreation | 2026 |
| Crosstree Art Ltd | Arts & recreation | 2025 |
| Crown Heights Leaseholders Right to Manage Company Ltd | Households | 2025 |
| Crown Lift Trucks Limited | Wholesale & retail | 1988 |
| Crown Valley Ltd. | Households | 1987 |
| Crown Will Planning Services Limited | Professional & scientific | 1996 |
| Crown Wills Limited | Professional & scientific | 1992 |
| Crystal Care Professionals Ltd | Manufacturing | 2021 |
| Crystal Childcare Limited | Education | 1998 |
| Crystal Data Ltd | Information & communication | 2020 |
| Crystal Spotlight Limited | Information & communication | 2025 |
| Crystal-Tech Electronics Limited | Administrative & support | 2003 |
| CS Herzog Ltd | Professional & scientific | 2024 |
| CSL Marking Solutions Ltd | Construction | 2025 |