| Cost Optimisation Consultancy Ltd | Professional & scientific | 2023 |
| Cost Point Limited | Professional & scientific | 2026 |
| Costa Developments Limited | Real estate | 2019 |
| Costello's Bar Ltd | Hospitality | 2010 |
| Costello's Bar SH Ltd. | Hospitality | 2013 |
| Cosy Organic Ltd | Manufacturing | 2018 |
| Cosypubco Limited | Hospitality | 2019 |
| Cotswold Hills Ltd | Wholesale & retail | 2022 |
| Cottage Day Nursery Limited | Administrative & support | 2006 |
| Cottage Meadows Limited | Real estate | 2024 |
| Cottage Nurseries Limited | Administrative & support | 1998 |
| Cottam Parkinson Consulting Limited | Professional & scientific | 2004 |
| Cotton Works Group Ltd | Manufacturing | 2019 |
| Cottrell Motor Co Limited | Wholesale & retail | 2010 |
| Cottrells Construction Limited | Construction | 2025 |
| Coughlin Associates Ltd | Administrative & support | 2014 |
| Coultrup Technical Limited | Professional & scientific | 2021 |
| Country Delights Foods Limited | Wholesale & retail | 2011 |
| Country Pubs and Bars Holdings Ltd | Hospitality | 2024 |
| Country to Canvas Limited | Arts & recreation | 2026 |
| Countrywide Manchester Limited | Agriculture & fishing | 2018 |
| Countrywide Stockport Limited | Agriculture & fishing | 2018 |
| County Brides NW Ltd | Information & communication | 2025 |
| County Electrical Holdings Ltd | Financial services | 2020 |
| County Electrical Wholesalers Ltd | Wholesale & retail | 1991 |
| County Solar Limited | Wholesale & retail | 2025 |
| County Solar Supplies Ltd | Wholesale & retail | 2023 |
| Courier and Logistics Limited | Transport & logistics | 2016 |
| Court IT Solutions Limited | Information & communication | 2018 |
| Court Management Services Ltd | Professional & scientific | 2018 |
| Courtney Homes (UK) Limited | Construction | 2007 |
| Courtney-Smith Electrical Services Ltd | Construction | 2020 |
| Covent Garden Cost Management Limited | Professional & scientific | 2025 |
| Coviello Services Limited | Administrative & support | 2021 |
| Cowboy Kate Limited | Information & communication | 2017 |
| Cowcornerkitchen Ltd | Hospitality | 2026 |
| Cowley Engineering and Safety Management Services Limited | Administrative & support | 2016 |
| Coyne Civil Limited | Administrative & support | 2014 |
| CP Berry Electrical Limited | Construction | 2018 |
| CP Consultants Ltd | Administrative & support | 2022 |
| CP Engineering Limited | Administrative & support | 2015 |
| CP Enterprises Ltd | Real estate | 2019 |
| CP IT Project Services Limited | Information & communication | 2015 |
| CP Learning Ltd | Information & communication | 2019 |
| CP Search and Selection Ltd | Administrative & support | 2019 |
| CP Talent Solutions Limited | Administrative & support | 2026 |
| CPB Brickwork Ltd | Construction | 2019 |
| Cpcdc Limited | Administrative & support | 2025 |
| Cpeng Limited | Professional & scientific | 2018 |
| CPF Engineering Surveys Limited | Administrative & support | 2013 |
| CPG Solutions Limited | Information & communication | 2017 |
| CPM Construction Services Limited | Administrative & support | 2015 |
| CPM Construction Solutions Limited | Administrative & support | 2014 |
| CPM Vehicle Solutions Ltd | Wholesale & retail | 2020 |
| CPP Shuttles Limited | Transport & logistics | 2020 |
| CPP Travel Limited | Wholesale & retail | 2020 |
| Cppc Building Contractors Ltd | Construction | 2025 |
| CPR Engineering Limited | Professional & scientific | 2022 |
| CPW Executive Services Limited | Professional & scientific | 2007 |
| Cqils Limited | Professional & scientific | 2017 |
| CR Collins Limited | Professional & scientific | 2016 |
| CR Design Consultants Ltd | Professional & scientific | 2022 |
| Cr&C Solutions Ltd | Professional & scientific | 2018 |
| Crabtree Business Consultancy Limited | Administrative & support | 2015 |
| Cradle Care Software Ltd | Information & communication | 2021 |
| Cradle Solutions Ltd | Information & communication | 2019 |
| Craft in Mind C.I.C. | Hospitality | 2020 |
| Crafter Engineering Limited | Professional & scientific | 2023 |
| Crafthouse Creations Limited | Manufacturing | 2017 |
| Crafts Concessions Ltd | Wholesale & retail | 2021 |
| Crafts Consult Limited | Wholesale & retail | 2018 |
| Craftsuprint Limited | Information & communication | 2010 |
| Crafty Cask Ltd | Extraterritorial | 2018 |
| Crafty Cloud Limited | Information & communication | 2024 |
| Crafty Five Ltd | Hospitality | 2022 |
| Crafty Sloth Designs Limited | Manufacturing | 2022 |
| Craig Corbett Ltd | Administrative & support | 2025 |
| Craig Elliot Events Ltd | Information & communication | 2026 |
| Cranage Ltd | Real estate | 2023 |
| Crannonproducts Ltd | Wholesale & retail | 2025 |
| Crazy Fish Music Studio Ltd | Information & communication | 2019 |
| Crazy Wire Company Ltd | Wholesale & retail | 2026 |
| CRC North Ltd. | Construction | 1986 |
| CRC XA Ltd | Agriculture & fishing | 2021 |
| CRD Engineering & Design Limited | Professional & scientific | 2018 |
| Creamfield Limited | Hospitality | 1988 |
| Creamy Patina Ltd | Wholesale & retail | 2022 |
| Createdbysevenseven Limited | Professional & scientific | 2019 |
| Creating Positivity Limited | Professional & scientific | 2014 |
| Creative & ARC Limited | Professional & scientific | 2026 |
| Creative Flare Limited | Information & communication | 2008 |
| Creative Head Limited | Other services | 2003 |
| Creative HUT for Education Limited | Wholesale & retail | 2017 |
| Creative Media Concepts Ltd | Manufacturing | 2025 |
| Creative Personalised Ltd | Administrative & support | 2019 |
| Creative Training Ltd | Education | 2007 |
| Creative Transformation Limited | Professional & scientific | 2024 |
| Creativehut Group Holdings Limited | Financial services | 2024 |
| Creditchek Ltd | Information & communication | 2024 |
| Credware Risk Solutions Limited | Information & communication | 2010 |