| Capstone Painting & Decorating Limited | Construction | 2011 |
| Carless & Co (Consulting) Limited | Professional & scientific | 2023 |
| Caroline Dunne Consulting Ltd | Education | 2024 |
| Caroline Watson Consulting Limited | Professional & scientific | 2013 |
| Carters Project Management Ltd | Real estate | 2025 |
| Castelle Ltd | Construction | 2025 |
| Cat Woolner Interior Design Ltd | Professional & scientific | 2021 |
| Catch of the Day Limited | Wholesale & retail | 2018 |
| Cathar Consulting Ltd | Professional & scientific | 2016 |
| Catherston Manor Farm and Holiday Centre Limited | Hospitality | 1983 |
| CC Young Horse Specialist LLP | | 2017 |
| Cedar Meadow Homes Ltd | Real estate | 2023 |
| Chalets DE Charme Limited | Hospitality | 2014 |
| Channon Interim Property Services Limited | Construction | 2015 |
| Chapman Building & Plastering Ltd | Construction | 2012 |
| Chapman Geotechnical Ltd | Professional & scientific | 2022 |
| Chapo’S Retro Ltd | Wholesale & retail | 2024 |
| Charlotte Scott Properties Limited | Real estate | 2021 |
| Charmouth Central Limited | Arts & recreation | 2012 |
| Charmouth Heritage Coast Centre | Professional & scientific | 2004 |
| Chasing COW Productions CIC | Arts & recreation | 2020 |
| Chatterbox Cookery Limited | Hospitality | 2026 |
| Checkmate Devices Limited | Manufacturing | 1962 |
| Chelsea Internationale Limited | Professional & scientific | 1990 |
| Cherry Cottage Limited | Health & social care | 2024 |
| Chesil House Management Company Limited | Administrative & support | 1975 |
| Chilli by the Sea Ltd | Wholesale & retail | 2018 |
| Chiselbuild Ltd | Construction | 2018 |
| Chris Brown Editor Ltd | Information & communication | 2020 |
| Chris Stubbs & SON Limited | Construction | 2015 |
| Christie Constructive Limited | Professional & scientific | 2022 |
| Christopher Fearn Limited | Professional & scientific | 2013 |
| Church Place Management Company Bridport Limited | Households | 2018 |
| Church Rise (Bridport) Management Ltd | Households | 2020 |
| Churchhill House (Salcombe) Limited | Real estate | 2012 |
| Citadel Landmark Builders Limited | Construction | 2020 |
| Citadel Landmark Limited | Households | 2019 |
| Citadel Landmark Properties Ltd | Real estate | 2024 |
| CJ Building Maintenance & Developments Limited | Construction | 2008 |
| Claire Ford Consultancy Ltd | Professional & scientific | 2019 |
| Cleere Health & Safety Ltd | Professional & scientific | 2017 |
| Cliffe Freelancing Limited | Arts & recreation | 2025 |
| Cliffstone Holdings Ltd | Financial services | 2026 |
| Climb ANY Mountain | Health & social care | 2011 |
| Clist Properties Limited | Real estate | 2003 |
| Clive Rendell Plant Hire Limited | Administrative & support | 2007 |
| Clocktower Records Ltd | Wholesale & retail | 2022 |
| Cloud Quantum Limited | Information & communication | 2016 |
| Club 115 Ltd | Information & communication | 2019 |
| CMM Brokers Limited | Real estate | 2003 |
| Coastal Nets Limited | Agriculture & fishing | 2007 |
| Cofree Technology Limited | Manufacturing | 2002 |
| COG Business Consulting Limited | Professional & scientific | 2014 |
| Collins Court Chideock Management Limited | Households | 1993 |
| Colmers Capital Ltd | Financial services | 2023 |
| Colmers Consultancy Ltd | Professional & scientific | 2023 |
| Colt and Willow Ltd. | Manufacturing | 2019 |
| Columbjohn Limited | Manufacturing | 2019 |
| Comet Civils Limited | Construction | 2016 |
| Comfort Optics Co., Ltd | Administrative & support | 2023 |
| Common Good Consulting Ltd | Professional & scientific | 2024 |
| Composite Test & Evaluation Ltd | Professional & scientific | 2007 |
| Computerfix.It (UK) Ltd | Other services | 2006 |
| Coneygar Lodge Limited | Health & social care | 2003 |
| Conoor Health Limited | Wholesale & retail | 2013 |
| Construction and Engineering Dispute Resolution Services (2020 Vision) Ltd | Professional & scientific | 2021 |
| Consult.Pm Ltd | Professional & scientific | 2012 |
| Conttego Louvres Limited | Manufacturing | 2017 |
| Coombehope Limited | Professional & scientific | 2004 |
| Coppet Hill LLP | | 2021 |
| Correling Limited | Administrative & support | 2007 |
| Coterie Creative Limited | Professional & scientific | 2008 |
| Cotton & SON Limited | Extraterritorial | 2000 |
| Country House Weekends Ltd | Hospitality | 2014 |
| Country Seats (Dorset) Limited | Wholesale & retail | 2004 |
| Countryside Consulting Ltd | Agriculture & fishing | 2011 |
| Cousins Mechanical Services Limited | Wholesale & retail | 2024 |
| Coward Clinical Research Consultancy Ltd | Other services | 2023 |
| CP Plant & Tools Ltd | Manufacturing | 2022 |
| CQ Maintenance Ltd | Construction | 2022 |
| Cquest Shells Limited | Wholesale & retail | 2015 |
| Cravendale Estates Ltd | Real estate | 2021 |
| Created Futures Limited | Administrative & support | 2025 |
| Creative Marine Solutions Ltd | Manufacturing | 2012 |
| Creatorx Ventures Ltd | Education | 2025 |
| Crisp Pubs Limited | Hospitality | 2009 |
| Crowe - Watson Recruitment Limited | Administrative & support | 2020 |
| Crystal Shine Home Range Ltd | Wholesale & retail | 2024 |
| Crystal Shine South West Cleaning Services Ltd | Administrative & support | 2023 |
| CTC Services Limited | Education | 2019 |
| D & S Symonds Ltd | Construction | 2011 |
| D F Property Limited | Real estate | 2003 |
| D Probets Engineering Limited | Professional & scientific | 2015 |
| D. H. J. Foot Holdings Limited | Hospitality | 2019 |
| D. J. Baggs (Groundworks) Limited | Extraterritorial | 1990 |
| D.T.O Takeaway Ltd | Hospitality | 2022 |
| Daley Home Care Limited | Health & social care | 2009 |
| Daniel Rowe Electrical Ltd | Construction | 2025 |
| Danni Poole Ltd | Professional & scientific | 2024 |
| Dapple Studio Limited | Professional & scientific | 2017 |