| COS DLA Ciebie/Something for YOU Ltd | Professional & scientific | 2011 |
| Cosgrove Holdings Limited | Real estate | 2000 |
| Cosgrove Limited | Real estate | 2015 |
| Cosmedic Shop Ltd | Wholesale & retail | 2019 |
| Cosmeticare Ltd | Health & social care | 2012 |
| Cosmic Consulting Ltd | Information & communication | 2025 |
| Cosmic Core Ltd | Wholesale & retail | 2025 |
| Cosmic Home Care Ltd | Health & social care | 2024 |
| Cosmient Ltd | Administrative & support | 2015 |
| Cost Craft Solutions Ltd | Extraterritorial | 2024 |
| Cost Savvy Motors Limited | Wholesale & retail | 1999 |
| Costa and Pearson Ltd | Professional & scientific | 2024 |
| Costa L&C Ltd | Households | 2025 |
| Costain Consulting (Garstang) Limited | Professional & scientific | 2026 |
| Costing Software Limited | Information & communication | 2010 |
| Costoption Limited | Real estate | 1999 |
| Cosy Homes (NW) Limited | Construction | 2025 |
| Cota Case Management Ltd | Professional & scientific | 2019 |
| Coterie College Ltd | Education | 2025 |
| Cotswold Contractors Clanfield Ltd | Construction | 2018 |
| Cottage Farm Project Ltd | Construction | 2024 |
| Cottam Computers Limited | Information & communication | 2008 |
| Cottam Court Management Company Limited | Households | 1979 |
| Cottam Hall Properties Limited | Construction | 2003 |
| Cottams (Management) Company Limited | Households | 1985 |
| Cotterwood Consulting Ltd | Information & communication | 2013 |
| Cotton Court Services Limited | Real estate | 2014 |
| Cottontail Construction Ltd | Construction | 2025 |
| COU Joinery and Construction Ltd | Construction | 2020 |
| Counsell and Woan (Floor Coverings) Limited | Wholesale & retail | 1950 |
| Country Approved Landscaping Ltd | Administrative & support | 2024 |
| Country Catering Ltd | Hospitality | 2026 |
| Country Collective Ltd | Manufacturing | 2020 |
| Country Fresh Produce Limited | Administrative & support | 2014 |
| Country Homes (Lancashire) Limited | Agriculture & fishing | 2002 |
| Country Lettings Limited | Real estate | 2020 |
| Country Rentals Limited | Real estate | 2026 |
| Country Storage (Commercial) Limited | Transport & logistics | 2012 |
| Countrywide Assured Life Holdings Limited | Financial services | 1991 |
| Countrywide Assured PLC | Financial services | 1988 |
| Countrywide Assured Services Limited | Financial services | 1993 |
| Countrywide Assured Trustee Company Limited | Financial services | 1998 |
| County Hotel Management Company Limited | Households | 2006 |
| Coupar Consultants Limited | Information & communication | 2010 |
| Coupe Aluminium Windows Ltd. | Manufacturing | 2017 |
| Coupe Bradbury Solicitors Ltd | Professional & scientific | 2013 |
| Coupe Property Limited | Construction | 2019 |
| Courageous Creative Limited | Professional & scientific | 2025 |
| Courtis Developments Limited | Construction | 2017 |
| Courtis Thomas Construction Limited | Construction | 2018 |
| Courtis Thomas Holdings Limited | Financial services | 2021 |
| Courtneys Aesthetics Ltd | Other services | 2024 |
| Courtyard Cafe Clifton Ltd | Hospitality | 2024 |
| Courtyard Cottage Stables Ltd | Agriculture & fishing | 2018 |
| Courtyard House LLP | | 2009 |
| Couture Designerwear Limited | Wholesale & retail | 2003 |
| Cove & Crumb Ltd | Hospitality | 2025 |
| Cove Construction & Consulting Limited | Construction | 2019 |
| Cove IT Consulting Ltd | Information & communication | 2014 |
| Covenant Books (Preston) | Wholesale & retail | 1997 |
| Covent Capital Ltd | Real estate | 2025 |
| Cover Caps Limited | Manufacturing | 2025 |
| COW Comfort A.H.S. Limited | Agriculture & fishing | 1991 |
| Cowley Baldon Green Limited | Energy | 2020 |
| Cowley Construction & Groundworks Ltd | Construction | 2015 |
| Cowling Business Park Ltd. | Construction | 2001 |
| Cowling Construction Limited | Construction | 1998 |
| Cowling Enterprises Limited | Manufacturing | 2013 |
| Cowomoma Ltd | Administrative & support | 2016 |
| Coworking Space Limited | Real estate | 2020 |
| COX Residentials Ltd | Real estate | 2020 |
| Coxon Holdings Limited | Financial services | 2021 |
| Coxon Property Limited | Real estate | 2021 |
| Coyle Medical Services Limited | Health & social care | 2015 |
| Cozy Pads Ltd | Real estate | 2019 |
| CP Developments NW Limited | Real estate | 2023 |
| CP Frames Ltd | Administrative & support | 2007 |
| CP Used Clothing Ltd | Wholesale & retail | 2026 |
| CPB North West Ltd | Construction | 2015 |
| CPB Projectss Ltd | Construction | 2012 |
| CPF Property Services Limited | Construction | 2018 |
| CPL Building Services (Holdings) Limited | Construction | 2017 |
| CPL Group (Holdings) Limited | Construction | 2020 |
| CPM Care Limited | Professional & scientific | 2008 |
| CPM Home Care Limited | Financial services | 2021 |
| CPS (Holdings) Limited | Manufacturing | 2014 |
| CPS Compliance Limited | Professional & scientific | 2026 |
| CPS Fencing and Landscaping Ltd | Administrative & support | 2026 |
| CPW Property Management & Solutions Ltd | Wholesale & retail | 2021 |
| CRA Engineering Limited | Professional & scientific | 2011 |
| Craft Bidco Limited | Financial services | 2025 |
| Craft Midco Limited | Financial services | 2025 |
| Craft Slope Building Ltd | Construction | 2021 |
| Craft Topco Limited | Financial services | 2025 |
| Crafted Gastronomy Limited | Hospitality | 2025 |
| Crafted Knife Co. Ltd | Manufacturing | 2021 |
| Craftsmans Total Maintenance Limited | Construction | 1997 |
| Crafty Beggars ALE Houses Ltd | Hospitality | 2021 |
| Crafty Cutter Limited | Wholesale & retail | 2014 |
| Cragg & Roberts Limited | Wholesale & retail | 2003 |