| CPF Barns Management Limited | Households | 2013 |
| Crafty Arty Parties Limited | Other services | 2001 |
| Crafty Cuppa CIC | Wholesale & retail | 2024 |
| Craig's Taxis Ltd | Transport & logistics | 2022 |
| Crane Away Ltd | Transport & logistics | 2020 |
| Craven House Capital PLC | Financial services | 2004 |
| Crawling Dog Printers Ltd | Manufacturing | 2020 |
| CRD Ventures Limited | Financial services | 2020 |
| Creation Baumann Ltd | Wholesale & retail | 1966 |
| Creative About Cuisine Limited | Hospitality | 2012 |
| Creative Development Partnership LLP | | 2016 |
| Creative Image Studio Ltd | Other services | 2021 |
| Creekmoor Investments Limited | Construction | 1962 |
| Crepe Cuisine Limited | Manufacturing | 1987 |
| Crickmay Stark Architects Ltd | Professional & scientific | 2003 |
| Crimson Guitars Limited | Manufacturing | 2013 |
| CRIS8 Ltd | Health & social care | 2025 |
| CRL Osmington Mills Limited | Hospitality | 2009 |
| Crocker Cladding Limited | Construction | 2020 |
| Crocker Enterprises Limited | Manufacturing | 2006 |
| Crockway Farms Limited | Agriculture & fishing | 2011 |
| Crossfit Durnovaria Ltd | Arts & recreation | 2023 |
| Crossway Garage (Dorset) Limited | Wholesale & retail | 2017 |
| Crossways Travel Ltd | Administrative & support | 2018 |
| Crown Commerce Ltd | Real estate | 2021 |
| Crown Gardens (Tolpuddle) Management Company Limited | Households | 2009 |
| Crown Place (Poundbury) Management Company Limited | Real estate | 2019 |
| Crumbleholme Builders LLP | | 2013 |
| Cruze Control Ltd | Education | 2026 |
| Crystal Clear Cornwall Limited | Administrative & support | 2015 |
| CS11 Limited | Hospitality | 2025 |
| Csorba Utilities & Groundworks Ltd | Construction | 2014 |
| CTR Tree Services Ltd | Administrative & support | 2024 |
| Cubitt Consulting Limited | Administrative & support | 1998 |
| Cueboid Ltd | Wholesale & retail | 2021 |
| Cull Contracting Services Limited | Construction | 2004 |
| Cura Opis Limited | Professional & scientific | 2008 |
| Curiosity Projects Ltd | Hospitality | 2024 |
| Curious Frog Limited | Information & communication | 2017 |
| Curriocity Limited | Hospitality | 2025 |
| Custom Marine International Ltd | Manufacturing | 2023 |
| Customisedgiftgb Limited | Manufacturing | 2024 |
| CUT2SIZE Limited | Manufacturing | 2020 |
| Cutlers Farm Limited | Agriculture & fishing | 1962 |
| CUTZ4U Barbers Ltd | Other services | 2021 |
| CUTZ4U Ltd | Administrative & support | 2019 |
| Cybexer (UK) Ltd | Information & communication | 2024 |
| Cyclopic Holdings Limited | Financial services | 2021 |
| Cyclopic Ltd | Manufacturing | 2018 |
| Cygnet Industries Limited | Financial services | 2007 |
| Cygnus NDT Solutions Limited | Financial services | 2008 |
| Cygnus Property Investments Ltd | Real estate | 2019 |
| D & G Flooring (Bristol) Ltd | Construction | 2005 |
| D & M Plumbing, Heating & Maintenance Ltd | Construction | 2016 |
| D a Parsons Construction Limited | Construction | 2003 |
| D H Townsend Limited | Administrative & support | 2004 |
| D Jenkins Flooring Limited | Construction | 2019 |
| D R Gibson Services Ltd | Professional & scientific | 2023 |
| D R Holt Limited | Arts & recreation | 2009 |
| D S R Building Services Ltd | Construction | 2015 |
| D W Ford & SON Goats Limited | Agriculture & fishing | 2014 |
| D Wills Project Services Limited | Information & communication | 2011 |
| D&D Carpentry & Construction Ltd | Manufacturing | 2025 |
| D'Arrigo Holdings Ltd | Financial services | 2024 |
| D-Day Dorset Ltd | Arts & recreation | 2015 |
| D. J. Chalk Limited | Professional & scientific | 2013 |
| D.A. Entertainments Limited | Arts & recreation | 1976 |
| D.J. Chutter Limited | Construction | 1987 |
| D.P. Burridge (Developments) Ltd | Construction | 2003 |
| D1 Bars & Leisure Ltd | Hospitality | 2025 |
| D1 Cleaning & FM Ltd | Administrative & support | 2023 |
| D5T5 Ltd | Wholesale & retail | 2024 |
| Dack Creative Ltd | Wholesale & retail | 2025 |
| Dacre Contract Management Limited | Agriculture & fishing | 1998 |
| Dalaric Limited | Information & communication | 2009 |
| Dale Court (Yeovil) Limited | Households | 1985 |
| Damers Blinds Limited | Wholesale & retail | 2013 |
| Dampier Press Limited | Manufacturing | 2011 |
| DAN Wilton Limited | Professional & scientific | 2010 |
| Dance Extreme Limited | Arts & recreation | 2014 |
| Dandawate Health Solutions Ltd | Health & social care | 2021 |
| Danick Steel Limited | Manufacturing | 2018 |
| Danmack Racing Ltd | Arts & recreation | 2022 |
| Darkin Miller Limited | Professional & scientific | 2013 |
| Darkskull Clothing Ltd | Wholesale & retail | 2025 |
| Datacenta Hosting Ltd | Information & communication | 2023 |
| Dataman Programmers Limited | Manufacturing | 1992 |
| Datum Design & Carpentry Ltd | Manufacturing | 2023 |
| Datum Point Consulting Limited | Information & communication | 2021 |
| Dave White Creates (Trading) Limited | Arts & recreation | 2004 |
| Dave White Creates Limited | Arts & recreation | 2004 |
| Davey Independent Trader Limited | Manufacturing | 2020 |
| David Aesthetics Ltd | Health & social care | 2024 |
| David Antony Limited | Other services | 2002 |
| David Coward Painting and Decorating Limited | Construction | 2003 |
| David Hunt Construction Ltd | Construction | 2012 |
| David Vincent Limited | Wholesale & retail | 1997 |
| David Webb Building Contractors Limited | Construction | 1979 |
| Davy-Bowker Group Limited | Financial services | 2020 |
| Dawnfact Limited | Information & communication | 2017 |