| Country Rovers Limited | Wholesale & retail | 2018 |
| Country Windows Ltd | Construction | 2014 |
| Countryman's Choice Limited | Extraterritorial | 2006 |
| Countryside Retail Brands Limited | Information & communication | 2020 |
| County Granite and Marble Limited | Manufacturing | 2015 |
| County Hardwoods Limited | Wholesale & retail | 1998 |
| Court Mill Builders Ltd | Construction | 2014 |
| Courtlands Estates (Taunton) Ltd | Real estate | 2014 |
| Courtlands Farm (Langford Budville) Management Limited | Households | 2008 |
| Courtney's Services Limited | Wholesale & retail | 2022 |
| Courtyard Crafts Limited | Real estate | 1976 |
| Coverdale Court (Yeovil) Management Company Limited | Households | 2022 |
| Cowling Farms Limited | Agriculture & fishing | 2022 |
| Cowling Group Ltd | Financial services | 2026 |
| Cox's Car and Commercial Ltd | Wholesale & retail | 2026 |
| Coxview Limited | Health & social care | 2022 |
| Cozy Nest Property Development Ltd | Real estate | 2025 |
| Cozycabinsuk Ltd | Manufacturing | 2025 |
| CP Dorset Ltd | Financial services | 2023 |
| CPC Services (Weston) Ltd | Information & communication | 2015 |
| Cpcab Limited | Education | 1994 |
| CPD Civils Consultant Ltd | Professional & scientific | 2022 |
| CR & R Fleet Lease Limited | Administrative & support | 2016 |
| CR & R Ltd | Wholesale & retail | 2013 |
| CR Rendering Services Ltd | Construction | 2019 |
| CR0WNN Ltd | Wholesale & retail | 2013 |
| Cracknell Workwear Ltd | Manufacturing | 2025 |
| Crafty Camping Limited | Other services | 2026 |
| Cranbrook Limited | Households | 2011 |
| Cranford Training Limited | Information & communication | 2003 |
| Crazy Moll's Limited | Hospitality | 2021 |
| CRD Express Ltd | Health & social care | 2018 |
| Cream Care Group Limited | Financial services | 2020 |
| Cream Care Limited | Health & social care | 2019 |
| Cream Care Supported Living Limited | Health & social care | 2019 |
| Cream Holdings (Taunton) Limited | Health & social care | 2008 |
| Cream I Limited | Health & social care | 2008 |
| Cream II Limited | Health & social care | 2006 |
| Cream III Limited | Health & social care | 2014 |
| Cream IV Limited | Health & social care | 2017 |
| Cream Residential Care Limited | Health & social care | 2005 |
| Cream-Team Limited | Hospitality | 2005 |
| Create Green Space Ltd | Administrative & support | 2023 |
| Creation Flooring and Carpentry Limited | Construction | 2013 |
| Creation Golf Limited | Arts & recreation | 2024 |
| Creation PS Limited | Construction | 2024 |
| Creative Bespoke Projects Ltd | Manufacturing | 2025 |
| Creative Catering (South West) Limited | Hospitality | 2012 |
| Creative Digital Ecosystems Ltd | Information & communication | 2025 |
| Creative Industries Somerset Ltd | Administrative & support | 2019 |
| Creative Innovation Centre C.I.C. | Arts & recreation | 2012 |
| Creative Minds Taunton CIC | Arts & recreation | 2025 |
| Credo FS Ltd | Information & communication | 2020 |
| Creech Construction Limited | Construction | 2014 |
| Crescent Dental Care Ltd | Health & social care | 2012 |
| Crescent Utilities Ltd | Construction | 2023 |
| Crescentsweets Cakes & Pastries Ltd | Wholesale & retail | 2025 |
| Cressida House Dormant Ltd | Health & social care | 2019 |
| Cressida House Group Practice Ltd | Health & social care | 2019 |
| Cressida House Psychology Ltd | Health & social care | 2019 |
| Crest Heights (Portishead) Management Company Limited | Real estate | 2013 |
| Cricketer Farm (Nether Stowey) Management Company Limited | Households | 2022 |
| Cricsi Ltd | Information & communication | 2025 |
| CRIDDY4X4 Ltd | Mining & quarrying | 2018 |
| Crimson Properties Limited | Real estate | 2012 |
| Cristea-Dent Ltd | Health & social care | 2024 |
| Croft Garage Limited | Wholesale & retail | 2002 |
| Croft House Taunton Limited | Real estate | 2023 |
| Croghan Peat Industries Limited | Wholesale & retail | 1998 |
| Crooked Chimney's Retreat Ltd | Hospitality | 2026 |
| Cross Coastal Camper Hire Ltd | Hospitality | 2023 |
| Cross Hive Ltd | Professional & scientific | 2025 |
| Cross Keys (Taunton) Limited | Real estate | 1984 |
| Crossroads Partnership Limited | Professional & scientific | 2017 |
| Crowcombe Automotive Ltd | Wholesale & retail | 2025 |
| Crowcombe Heathfield Management Company Limited | Administrative & support | 1998 |
| Crown Cottage Somerset Ltd | Wholesale & retail | 2012 |
| Crown Farming Limited | Agriculture & fishing | 2017 |
| Crown House Improvements Limited | Construction | 2013 |
| Crown Lodge Investments Limited | Real estate | 1995 |
| Crown Mart Trade Ltd | Wholesale & retail | 2025 |
| Crown Mill Management Company Ltd | Households | 2017 |
| Crown Street West Management Company Limited | Households | 2016 |
| Crownhill Dental Practice Limited | Health & social care | 2006 |
| Croylynn Builders 1992 Limited | Construction | 1992 |
| Crucast Ltd | Professional & scientific | 2019 |
| Crushers Incorporated Limited | Construction | 2005 |
| Crystal Care and Support Limited | Health & social care | 2012 |
| Crystal Care Holdings Limited | Financial services | 2023 |
| Crystal Commercial Cleaning Ltd | Administrative & support | 2023 |
| CS Fencing & Decking Limited | Construction | 2020 |
| CS Gateway Partners Limited | Information & communication | 2015 |
| CS Price Trading Limited | Wholesale & retail | 2023 |
| CS Resources Limited | Information & communication | 2015 |
| CS World Services Limited | Manufacturing | 2008 |
| Cseq Technologies Ltd | Agriculture & fishing | 2022 |
| Csl-Intell Ltd | Professional & scientific | 2024 |
| CSN MAN Co Ltd | Real estate | 2024 |
| Cspf Limited | Other services | 2020 |
| CSW Ltd | Administrative & support | 2023 |