| Caplen Plumbing and Heating Limited | Construction | 2010 |
| Caplen Properties Ltd | Real estate | 2024 |
| Captur Interactive Ltd | Professional & scientific | 2020 |
| Car & Commercial Valeting Service Ltd | Administrative & support | 2025 |
| Carcanet Limited | Arts & recreation | 2024 |
| Care Dorset Holding Limited | Health & social care | 2022 |
| Care Dorset Limited | Health & social care | 2022 |
| Care Unlimited Dorchester Ltd. | Public administration | 2023 |
| Career Directed Solutions Limited | Professional & scientific | 2011 |
| Career Mapping Limited | Administrative & support | 1999 |
| Carleton Nominees Ltd | Financial services | 2025 |
| Carleton Trustees Limited | Administrative & support | 2008 |
| Carlin Boat Charter Limited | Transport & logistics | 2002 |
| Carlton Management Company Limited | Households | 1983 |
| Caromel Commercial Limited | Real estate | 2022 |
| Carpets Select (Southern) Ltd | Wholesale & retail | 2005 |
| Cask AGE Holdings Limited | Wholesale & retail | 2024 |
| Casparwall Ltd | Information & communication | 2021 |
| Cassea Court (Bridport) Management Company Limited | Households | 1989 |
| Cassea Court Management Company Limited | Households | 1980 |
| Casterbridge Hotel Ltd | Hospitality | 2022 |
| Casterbridge Kennels Limited | Hospitality | 2012 |
| Casterbridge Motor Group Limited | Wholesale & retail | 2017 |
| Castle Hill Management Limited | Households | 1995 |
| Castlemain Management Company Limited | Households | 2016 |
| Catalpa Capital Ltd | Other services | 2025 |
| Caterworx LLP | | 2023 |
| Catmead Management Company Limited | Households | 2006 |
| Catnip Comms Ltd | Professional & scientific | 2020 |
| Cavendish Court (Weymouth) Management Company Limited | Households | 2004 |
| CB Reid Limited | Professional & scientific | 2003 |
| CBD Festivals Limited | Arts & recreation | 2019 |
| CC EOT Limited | Professional & scientific | 2024 |
| CCP Electrical Services Limited | Construction | 2025 |
| CCR Productions Limited | Administrative & support | 2012 |
| Cctvision Limited | Administrative & support | 2019 |
| Cedars Castle Hill | Health & social care | 2000 |
| Cello Consulting Ltd | Professional & scientific | 2025 |
| Central Farm Residents Management Limited | Other services | 2012 |
| Centre for Empowering Patients and Communities CIC | Health & social care | 2022 |
| Cerne Abbas Brewery Ltd | Manufacturing | 2014 |
| Cerne Market House Ltd | Hospitality | 2022 |
| Cerne Valley Contracts Limited | Administrative & support | 2002 |
| Chalbury Dene Management Company Limited | Households | 2013 |
| Chalis Fire Engineering Limited | Public administration | 2005 |
| Chalk Giant Ltd | Wholesale & retail | 2017 |
| Chalk PIT Sporting Club Limited | Arts & recreation | 2021 |
| Challacombe House Management Limited | Households | 2005 |
| Challenger Trailers UK Limited | Wholesale & retail | 2019 |
| Chalmington Manor Estate Limited | Real estate | 2022 |
| Chambers Flatroofing Ltd | Construction | 2021 |
| Channel and Mobile Solutions Limited | Information & communication | 2003 |
| Charles William Group Limited | Real estate | 2024 |
| Charlotte Hope Ltd | Arts & recreation | 2019 |
| Charlton Down Health & Fitness Club Ltd | Arts & recreation | 2022 |
| Charlton Down Village Shop Ltd | Administrative & support | 2006 |
| Charminster Garage Limited | Wholesale & retail | 2015 |
| Charminster, Charlton Down and Stinsford Community Publications Ltd | Information & communication | 2018 |
| Chartcombe Management Limited | Households | 1987 |
| Chartcombe Properties Limited | Households | 1996 |
| Charter (S.W.) Limited | Construction | 2005 |
| Charterhouse Designs Ltd | Real estate | 2009 |
| Chaseplus UK Ltd | Wholesale & retail | 2021 |
| Chask Ltd | Professional & scientific | 2021 |
| Chatelard Ventures Limited | Professional & scientific | 2023 |
| Chcm Enterprise Ltd | Wholesale & retail | 2021 |
| Cheeky Monkeys CASH4CLOTHES Ltd | Wholesale & retail | 2018 |
| Chegs Limited | Administrative & support | 2012 |
| Chelborough Limited | Arts & recreation | 1988 |
| Chele Care Limited | Health & social care | 2020 |
| Chener Books Limited | Wholesale & retail | 2018 |
| Cherryade Ltd | Wholesale & retail | 2013 |
| Cheryl Welbourn Consultancy Limited | Information & communication | 2024 |
| Cheselbourne Farms Limited | Extraterritorial | 1964 |
| Cheselbourne Management Limited | Households | 1993 |
| Chesil Investments Limited | Real estate | 2023 |
| Chesil Magazine | Administrative & support | 2006 |
| Chesil Press Ltd | Construction | 2015 |
| Chesil Social Work Services Ltd | Health & social care | 2025 |
| Chetcombe Mews Building 2 Management Company Limited | Households | 2011 |
| Chew Magna Property Developments Ltd | Construction | 2020 |
| China Express GQL Ltd | Hospitality | 2024 |
| Chine Hill Cottages Management Limited | Water & waste | 2018 |
| Chris Ascott Ltd | Professional & scientific | 2017 |
| Chris Cahill Limited | Professional & scientific | 1997 |
| Chris Courtaux Consultants Ltd | Professional & scientific | 2019 |
| Chris Rawlings Building & Maintenance Limited | Construction | 2022 |
| Christchurch Garage Ltd | Wholesale & retail | 2026 |
| Church Acre Management Company (Dorchester) Limited | Households | 1984 |
| Church Farm (East Stour) Limited | Agriculture & fishing | 1952 |
| Church Street Close Management Co. Limited | Households | 1986 |
| Cilfa (UK) Limited | Administrative & support | 2009 |
| Citrus Sea Limited | Information & communication | 2009 |
| City Structural Ltd | Professional & scientific | 2016 |
| Cj's Mechanics Limited | Wholesale & retail | 2024 |
| CJB Agencies Limited | Wholesale & retail | 2012 |
| Claimit Software Limited | Information & communication | 2023 |
| Clare Carpenter Consulting Ltd | Professional & scientific | 2016 |
| Claret UK Limited | Professional & scientific | 2007 |
| Clark Construction (Dorset) LLP | | 2011 |