| Commercial Facilities Services Ltd | Administrative & support | 2016 |
| Committed Citizens Limited | Professional & scientific | 2026 |
| Comms and Culture Ltd | Professional & scientific | 2022 |
| Community Homes South West Limited | Professional & scientific | 2018 |
| Compagnie Normande DE Controle Limited | Administrative & support | 2013 |
| Compass Building and Maintenance Ltd | Construction | 2019 |
| Compass Cabs Totnes Ltd | Transport & logistics | 2023 |
| Compass Interiors (S W) Limited | Manufacturing | 2005 |
| Compass Properties (SW) Ltd | Hospitality | 2021 |
| Compass South Management Limited | Households | 2000 |
| Complete Carpentry & Construction Ltd | Construction | 2017 |
| Complete Facilities Management Services Limited | Administrative & support | 2017 |
| Complete Park Services (SW) Limited | Construction | 2022 |
| Complys Technology Ltd | Information & communication | 2026 |
| Compton House Torquay Management Company Limited | Households | 2022 |
| Concept Waste Management (SW) Limited | Water & waste | 2025 |
| Coniston Holdings (SW) Ltd | Financial services | 2024 |
| Connect Build Ltd | Construction | 2023 |
| Connect Developments (SW) Ltd | Construction | 2023 |
| Connected Family Time Services Ltd | Health & social care | 2025 |
| Connell Heating and Plumbing Limited | Construction | 2006 |
| Construct Building Contractors Ltd | Construction | 2023 |
| Construx (SW) Ltd | Construction | 2026 |
| Consulaid Limited | Hospitality | 2013 |
| Consultancy Express (UK) Limited | Professional & scientific | 1996 |
| Contakt HR Ltd | Information & communication | 2009 |
| Contri Limited | Information & communication | 2023 |
| Control Catering Limited | Information & communication | 2021 |
| Conway Court (Exeter) Management Company Limited | Households | 1966 |
| Conway Court (Paignton) Management Limited | Households | 1988 |
| Coombe Cottage Ltd | Real estate | 2023 |
| Coombe Court Developments Ltd | Real estate | 2022 |
| Coombe House Holdings Ltd | Real estate | 2023 |
| Coombe Vale Management Company Limited | Professional & scientific | 2007 |
| Coote Enterprises Limited | Professional & scientific | 1998 |
| Copesafe Fire Protection Limited | Construction | 2025 |
| Copperthrust Ltd | Wholesale & retail | 2026 |
| Corbyn Lodge Limited | Real estate | 2011 |
| Corestone Capital Limited | Real estate | 2026 |
| Corner Construction SW Ltd | Construction | 2021 |
| Cornwall & Devon Services Limited | Financial services | 2019 |
| Cosy Conservatories SW Ltd | Construction | 2020 |
| Country House (Torquay) Management Company Limited | Households | 2019 |
| Country Kitchen Bakes Ltd | Manufacturing | 2025 |
| Country Nettle Ltd | Wholesale & retail | 2020 |
| Countryside International Limited | Professional & scientific | 2006 |
| County Magazines Limited | Information & communication | 1999 |
| County Windows (UK) Limited | Construction | 2006 |
| Courtenay Manor RTM Company Limited | Households | 2017 |
| Courtenay Mews Management Company Limited | Administrative & support | 2005 |
| Courtlands (Torquay) Limited | Households | 2018 |
| Courtyard Cottages (Denbury) Management Company Limited | Households | 2010 |
| Cove Cleaning Limited | Administrative & support | 2023 |
| Cove Court (Paignton) Management Company Limited | Households | 1989 |
| COX of Torbay (Holdings) Limited | Professional & scientific | 2002 |
| COX Publishing Ltd | Information & communication | 2014 |
| CPC Consultants Limited | Information & communication | 2013 |
| CPG Boulevard Limited | Wholesale & retail | 2024 |
| Crabhouse Limited | Hospitality | 2011 |
| Cranbrooke Property Limited | Construction | 2012 |
| Cranmere Pool Limited | Real estate | 1997 |
| Created.By Ltd | Other services | 2012 |
| Crelake Care Limited | Health & social care | 2004 |
| Crest View Management Company Limited | Households | 2001 |
| Cretuflo Ltd | Health & social care | 2025 |
| CRF Enterprises Ltd | Wholesale & retail | 2023 |
| Crimson Gate Limited | Real estate | 2019 |
| Cris B Company Limited | Transport & logistics | 2026 |
| Croft Lodge Management Company Limited | Households | 2004 |
| Cross Hotels Limited | Hospitality | 2006 |
| Crotty Properties Ltd | Extraterritorial | 2024 |
| Crown Property Management Limited | Extraterritorial | 2002 |
| Crownwood Healthcare (Holdings) Limited | Professional & scientific | 2014 |
| Crownwood Healthcare (Temple Ewell) Limited | Health & social care | 2014 |
| Crownwood Healthcare (Topco) Limited | Health & social care | 2021 |
| CRU Torquay Limited | Hospitality | 2020 |
| Crystal T-Rok Estates Ltd | Real estate | 2021 |
| Crystal Wood Creations Ltd | Construction | 2011 |
| CSA Property Services Limited | Real estate | 2025 |
| CSC Horizons Limited | Professional & scientific | 2025 |
| CT Civil Engineering & Surfacing Ltd | Transport & logistics | 2018 |
| Culme Close Flats Management Company Limited | Households | 1998 |
| Culturecritic Limited | Other services | 2009 |
| Cultureshock Holdings Limited | Professional & scientific | 2006 |
| Cultureshock Media Limited | Information & communication | 2002 |
| Cultureshock Productions Limited | Administrative & support | 2006 |
| Cultureshot Media Ltd | Professional & scientific | 2007 |
| Cumberland House (Torquay) Limited | Households | 2011 |
| Cumbernauld Management Company Limited | Real estate | 1986 |
| Curiobouquet Ltd | Wholesale & retail | 2025 |
| Curragh Build Ltd | Construction | 2024 |
| Custom Mortgages Limited | Financial services | 2022 |
| Customer 1ST (UK) Ltd | Professional & scientific | 2014 |
| Customer Satisfaction Centre Ltd | Administrative & support | 2023 |
| Customs House Projects Limited | Construction | 2015 |
| Cuthbert Close Management Company Limited | Households | 2000 |
| Cuthbury Management Limited | Households | 2020 |
| CVS Property Services Limited | Construction | 2015 |
| CW Building Contractors Limited | Construction | 2020 |
| CWB Rural Consultancy Limited | Professional & scientific | 2019 |