| Core Calibrations Ltd | Transport & logistics | 2019 |
| Core Change Solutions Ltd | Information & communication | 2026 |
| Core Chemical Decontamination Ltd | Wholesale & retail | 2025 |
| Core Collectables Ltd | Wholesale & retail | 2025 |
| Core Components Ltd | Wholesale & retail | 2024 |
| Core Diagnostics Limited | Transport & logistics | 2020 |
| Core Electrical Ltd | Construction | 2006 |
| Core Psychological Assessments Limited | Administrative & support | 2012 |
| Corelle Properties Limited | Real estate | 2025 |
| Coretrack Ltd | Information & communication | 2025 |
| Corner House Property Limited | Real estate | 2019 |
| Cornerstone Composites Ltd | Manufacturing | 2024 |
| Cornerstone Projects Limited | Professional & scientific | 2004 |
| Cornish Enterprises Limited | Other services | 2017 |
| Cornwell Assets Limited | Financial services | 2012 |
| Corporate Advertising | Manufacturing | 1986 |
| Corporate Shield Limited | Professional & scientific | 2015 |
| Corporation Tax Rebates Limited | Professional & scientific | 2020 |
| Corran Partners Ltd | Real estate | 2020 |
| Cortec Construction and Property Maintenance Limited | Extraterritorial | 2021 |
| Cosida & Co Limited | Manufacturing | 2025 |
| Cost Control Environmental Ltd | Professional & scientific | 2014 |
| Costs Made Simple Ltd | Professional & scientific | 2021 |
| Cotlook Limited | Manufacturing | 1986 |
| Cottom Brothers (Food Manufacturers) Limited | Manufacturing | 1979 |
| Cottom Foods Limited | Manufacturing | 2002 |
| Coult Decorators Limited | Construction | 2014 |
| Countchart Limited | Wholesale & retail | 1990 |
| County Garage Doors Limited | Wholesale & retail | 2006 |
| County Pubs and Bars Limited | Hospitality | 2021 |
| Couper & Coulter Pharmacies Limited | Wholesale & retail | 1999 |
| Courtyard Restaurant Limited | Hospitality | 2018 |
| COW Shed Bar & Grill on Broadway Ltd | Hospitality | 2024 |
| Cowen Signs Ltd | Extraterritorial | 2024 |
| CP Electrical Commercial Ltd | Construction | 2023 |
| CP Electrical Domestic Ltd | Construction | 2023 |
| CP Maintenance & Engineering Ltd | Professional & scientific | 2022 |
| CPC Training 4U Ltd | Transport & logistics | 2024 |
| CPE Properties Ltd | Real estate | 2017 |
| Cpip (Europe) Ltd | Administrative & support | 2015 |
| CPM Abode Investments Limited | Real estate | 2023 |
| CPM Abode Limited | Real estate | 2023 |
| CPT Medical Limited | Education | 2023 |
| CPW Contracting Limited | Professional & scientific | 2016 |
| CR Tech Labs Ltd | Information & communication | 2025 |
| Crab and Sons Ltd | Professional & scientific | 2015 |
| Cracked Analogue Limited | Arts & recreation | 2002 |
| Crafted Sincerely Ltd | Wholesale & retail | 2024 |
| Craftwork Wirral Limited | Wholesale & retail | 2024 |
| Craiglockhart Limited | Information & communication | 2006 |
| Crane Wharf Estates Limited | Real estate | 2014 |
| Crason Properties Ltd | Real estate | 2014 |
| Craven Advisory Services Limited | Financial services | 2013 |
| Crawford Financial Planning Limited | Financial services | 2017 |
| CRB Haulage Limited | Transport & logistics | 2019 |
| Crds Management Limited | Construction | 2016 |
| CRE Construction Limited | Administrative & support | 2013 |
| CRE8SPACE Ltd | Professional & scientific | 2002 |
| Creative & Visual Limited | Arts & recreation | 2013 |
| Creative Business Services RAY Limited | Administrative & support | 2023 |
| Creative Glassworks Ltd | Manufacturing | 2017 |
| Credit Management & Training Services Ltd | Professional & scientific | 2012 |
| Cressington Limited | Extraterritorial | 1994 |
| Crevalo Ltd | Information & communication | 2025 |
| Crlr Ltd | Professional & scientific | 2019 |
| Croen Limited | Health & social care | 2024 |
| Croft Components Ltd. | Wholesale & retail | 2012 |
| Croft Consumables Ltd | Wholesale & retail | 2025 |
| Croft Engineering Services Limited | Professional & scientific | 2017 |
| Croft Financials Limited | Professional & scientific | 2023 |
| Croft Manor Estates Limited | Real estate | 2026 |
| Croft Tyres & Auto Centre Limited | Wholesale & retail | 2014 |
| Cronesapplar Ltd | Information & communication | 2024 |
| Crosland & Sons Limited | Construction | 2008 |
| Cross Electrical Solutions Limited | Construction | 2025 |
| Cross Level Consulting Ltd | Professional & scientific | 2025 |
| Cross Sports Futures CIC | Education | 2024 |
| Cross Sports Limited | Arts & recreation | 2006 |
| Crowd and Conflict Management Ltd | Professional & scientific | 2012 |
| Crown Barber Wirral Ltd | Other services | 2025 |
| Crown Haircut Ltd | Other services | 2026 |
| Crozier Commercial Vehicle Repair Limited | Wholesale & retail | 2006 |
| Cruheswall Limited | Hospitality | 2026 |
| Crumbs & Cuddles Playdate Cafe CIC | Hospitality | 2025 |
| Crunchtime Vending Ltd | Hospitality | 2025 |
| Cryptax UK Limited | Professional & scientific | 2022 |
| Crypto Forge Ltd | Information & communication | 2021 |
| Crys Engineering Ltd | Construction | 2017 |
| Crystal Reef Web Productions Limited | Information & communication | 2000 |
| Crystal Vision Care Limited | Health & social care | 2018 |
| CS Construction N/W Ltd | Construction | 2016 |
| CS Digital Print Ltd | Manufacturing | 2025 |
| CS Picks Ltd | Wholesale & retail | 2026 |
| CSH Energy Ltd | Manufacturing | 2025 |
| CSL Advisory Ltd | Professional & scientific | 2024 |
| CT Consulting Services Limited | Professional & scientific | 2021 |
| CTM Cleaning Group Ltd | Administrative & support | 2025 |
| CTS & SMS UK Ltd | Administrative & support | 2018 |
| CUBE7 Interiors Ltd | Professional & scientific | 2014 |
| Culdaff Consultants (UK) Limited | Professional & scientific | 2014 |