| Castle Farm Developments Limited | Professional & scientific | 2005 |
| Cat 618 Limited | Construction | 2024 |
| Catfoss Airfield Limited | Agriculture & fishing | 2022 |
| Cavendish Pope Limited | Professional & scientific | 2021 |
| Cavendish Sterling Limited | Other services | 2021 |
| CDR Catering & Refrigeration Limited | Professional & scientific | 2024 |
| CEH Consult Limited | Professional & scientific | 2025 |
| CFH Properties (South West) Ltd | Real estate | 2022 |
| Chals Retail Ltd | Wholesale & retail | 2026 |
| Changing World Productions Ltd | Information & communication | 2024 |
| Channon Wines (UK) Limited | Agriculture & fishing | 2025 |
| Chaotix Ltd | Information & communication | 2018 |
| Chapel Meadows Llangrove Limited | Households | 2005 |
| Chapel Tree Services Ltd | Agriculture & fishing | 2015 |
| Charitylog Limited | Information & communication | 2012 |
| Charlie Summers Portraits Ltd | Professional & scientific | 2024 |
| Charlotte Patrick Consult Ltd | Professional & scientific | 2019 |
| Chaseview Residents Management Company Limited | Households | 2022 |
| CHAT4BUSINESS Ltd | Administrative & support | 2019 |
| Chelsea Parkfields Ltd | Hospitality | 2023 |
| Chelsea Parkfields Property Management Limited | Real estate | 2023 |
| Chemtreat Limited | Extraterritorial | 1983 |
| Cherry Tree Barn Limited | Real estate | 2018 |
| Cherry Tree Barn Logging and Coppicing Ltd | Agriculture & fishing | 2024 |
| Chetwyn Properties Limited | Real estate | 2005 |
| Chiime Ltd | Health & social care | 2021 |
| Chip Timing Services Limited | Arts & recreation | 2015 |
| Chroma Therapies Ltd | Professional & scientific | 2013 |
| CIQ Enterprises Limited | Other services | 2025 |
| CKT Makeup Ltd | Information & communication | 2026 |
| Clarice Gill Ltd | Other services | 2026 |
| Classic Restorations Southwest Ltd | Wholesale & retail | 2020 |
| Cleanleads Limited | Extraterritorial | 2012 |
| Cleve Consulting Limited | Hospitality | 2014 |
| Clewer Stables Ltd | Other services | 2023 |
| Client Creation Academy Ltd | Professional & scientific | 2016 |
| Clockwork Goblin Ltd | Manufacturing | 2013 |
| CMB Property Holdings Limited | Real estate | 2024 |
| CMB Property Holdings NO2 Limited | Real estate | 2024 |
| CMB Property NO1 Limited | Real estate | 2024 |
| CMB Property NO2 Limited | Real estate | 2024 |
| Coaching Executives Limited | Professional & scientific | 2001 |
| Community Chaplaincy Association | Health & social care | 2008 |
| Company Management and Restructuring Limited | Professional & scientific | 2025 |
| Compass Point Potential Limited | Health & social care | 2018 |
| Compers News Limited | Extraterritorial | 2005 |
| Computers It.It Limited | Information & communication | 2002 |
| Concept Cowhouse Ltd | Agriculture & fishing | 2006 |
| Concept Racing Limited | Manufacturing | 2009 |
| CONSULT365 Services Limited | Real estate | 2021 |
| Consulting on Energy Limited | Professional & scientific | 2024 |
| Consumer Lifestyles Limited | Extraterritorial | 2009 |
| Controlled Applications Limited | Professional & scientific | 1992 |
| Copper Consulting Ltd | Health & social care | 2025 |
| Coppett Hill Common Trust Limited(The) | Arts & recreation | 1985 |
| Copthorne Wentworth Limited | Real estate | 2023 |
| Cordor Ltd | Construction | 2026 |
| Core Architecture Ltd | Professional & scientific | 2021 |
| Corner House Holdings 2026 Limited | Construction | 2026 |
| Corstiaan Enterprises Limited | Arts & recreation | 2023 |
| Country House Lettings Limited | Hospitality | 2017 |
| Court Farm Barns Management Company Limited | Real estate | 2007 |
| Courtney MAY Aesthetics Ltd | Other services | 2021 |
| Crack of Dawn Limited | Financial services | 2017 |
| Craddock Consultancy Limited | Education | 2024 |
| Craig Taylor Plumbing and Heating Limited | Construction | 2018 |
| Crane Rail Surveys Limited | Professional & scientific | 2006 |
| Crbn Markets Ltd | Other services | 2023 |
| Crosmill Holdings Ltd | Water & waste | 1999 |
| Crosmill Limited | Professional & scientific | 1982 |
| Cryptex Holdings Ltd | Professional & scientific | 2019 |
| CS Protections Ltd | Wholesale & retail | 2024 |
| Cswifi.Uk Ltd | Information & communication | 2025 |
| Culinary Arts Events Limited | Hospitality | 2022 |
| Curtis Collective Ltd | Professional & scientific | 2025 |
| Curtis Engineering (Frome) Limited | Construction | 2017 |
| Custom Holds Ltd | Administrative & support | 2011 |
| Customcard Limited | Manufacturing | 1981 |
| Cutter Solar Limited | Construction | 2010 |
| Cyber Five SIX Ltd | Information & communication | 2022 |
| D Boynton and SON Limited | Agriculture & fishing | 2016 |
| Dalton Software Solutions Ltd | Information & communication | 2015 |
| Danterwood Limited | Hospitality | 2006 |
| Darnells Farm Luxury Glamping Limited | Hospitality | 2017 |
| Data Locator Limited | Extraterritorial | 2004 |
| David Christopher Jewellers Limited | Professional & scientific | 1999 |
| David Christopher Limited | Wholesale & retail | 1988 |
| David Christopher Two Limited | Real estate | 2015 |
| David Hepworth Management Services Ltd | Administrative & support | 2016 |
| Davidson John Limited | Construction | 1996 |
| Dawley Estates Limited | Real estate | 1994 |
| Dawley Services Limited | Professional & scientific | 1991 |
| Dcas Technology Ltd | Information & communication | 2025 |
| DCD Developments Limited | Construction | 2014 |
| Dchp Limited | Construction | 2011 |
| DCL Valuation Limited | Construction | 2023 |
| Dean Electrical Wholesale Ltd. | Wholesale & retail | 1992 |
| Dean GAS Services Limited | Construction | 2004 |
| Dean Homes Limited | Real estate | 2011 |
| Dempsey Decourcy Architects LLP | | 2013 |