| Clothier Advisory Ltd | Information & communication | 2026 |
| Cloud 99 Ltd | Administrative & support | 2021 |
| Clover Property Holdings Limited | Real estate | 2017 |
| CLP Safety & Training Limited | Financial services | 2009 |
| Clwot Limited | Real estate | 2019 |
| CMH (South West) Limited | Real estate | 2001 |
| Cmh(South West) Referencing Limited | Administrative & support | 2012 |
| CMW Services Building Construction & Maintenance Ltd | Construction | 2019 |
| CNB Beauty Ltd | Other services | 2026 |
| CNB Nails Ltd | Other services | 2026 |
| Coat Martock Limited | Hospitality | 2013 |
| Cobb & Hutch Consulting Ltd | Professional & scientific | 2023 |
| Cobb View Developments Ltd | Construction | 2025 |
| Cobb View Homes Ltd | Construction | 2025 |
| Cobux Limited | Administrative & support | 2014 |
| Cockwood Tyres Limited | Wholesale & retail | 2023 |
| Cocoya Limited | Wholesale & retail | 2024 |
| Codamark Ltd Ltd | Health & social care | 2025 |
| Cole Cleaning 24 Limited | Administrative & support | 2023 |
| Cole Farming Limited | Agriculture & fishing | 2009 |
| Colgrove Homes Limited | Construction | 2005 |
| Colin Freeman Furniture Limited | Manufacturing | 2002 |
| College of Paramedics | Other services | 2004 |
| College of Paramedics Learning and Education Limited | Education | 2014 |
| Collingwood Court (TA6) RTM Company Limited | Households | 2024 |
| Collins Properties (SW) Ltd | Real estate | 2025 |
| Colossal Fitness Limited | Arts & recreation | 2025 |
| Colwill Holdings Limited | Real estate | 2021 |
| Colwill Residential Holdings Limited | Real estate | 2025 |
| Combwich Solutions Limited | Information & communication | 2015 |
| Comfy Living Limited | Wholesale & retail | 2010 |
| Commercial Sunbed Hire Ltd | Administrative & support | 2025 |
| Company Tax Return Ltd | Professional & scientific | 2021 |
| Compass House Bridgwater Limited | Real estate | 2014 |
| Compass Tractors Limited | Wholesale & retail | 2003 |
| Complete Render South West Ltd | Construction | 2021 |
| Complete Render Specialists Limited | Construction | 2016 |
| Comtec Industries Limited | Professional & scientific | 2002 |
| Concord Extra Limited | Wholesale & retail | 2009 |
| Concord Property Limited | Real estate | 2012 |
| Connect Systems Global Ltd | Information & communication | 2015 |
| Conservatory Restorations Ltd | Manufacturing | 2026 |
| Construct Consultants Limited | Professional & scientific | 2021 |
| Construction Agricultural ( SW ) Ltd | Wholesale & retail | 2016 |
| Constructions Passion Ltd | Construction | 2019 |
| Constructs Carpentry Contractors Ltd | Manufacturing | 2026 |
| Constructs South West Ltd | Construction | 2013 |
| Consultoria WTE Grimsby Ltd | Energy | 2022 |
| Cook's Transport Ltd | Wholesale & retail | 2025 |
| Cooke's Retail Ltd | Wholesale & retail | 2023 |
| Cookes Quay Management Company Limited | Households | 1995 |
| Cooks Auto Works Ltd | Wholesale & retail | 2025 |
| Cool Stop Air Conditioning Limited | Wholesale & retail | 1993 |
| Cool Stop Online Limited | Wholesale & retail | 2021 |
| Coopers Cars (South West) Ltd | Wholesale & retail | 2013 |
| Copp Construction Limited | Construction | 2021 |
| Corespark Cleaning Ltd | Administrative & support | 2024 |
| Corks Bar Limited | Hospitality | 2014 |
| Cornel R Limited | Health & social care | 2019 |
| Cornerstone Counselling (South West) LLP | | 2014 |
| Coronation Road Property Management Limited | Households | 2018 |
| Cossey Limited | Administrative & support | 2011 |
| Costacorp Ltd | Professional & scientific | 2017 |
| Cothelstone Investments | Professional & scientific | 2026 |
| Cotswold Competitions Ltd | Arts & recreation | 2020 |
| Cotswold Design Ltd | Construction | 2014 |
| Cotswold Edge Beckford Limited | Real estate | 2001 |
| Countryside Fencing Somerset Limited | Construction | 2010 |
| Countrywide Construction SW Ltd | Construction | 2019 |
| Countrywide Windows Ltd | Construction | 2014 |
| County Classics Motor Museum | Arts & recreation | 2019 |
| Court Farm Butchers Limited | Wholesale & retail | 2013 |
| Courthouse Villas Management Company Ltd | Real estate | 2021 |
| Courtway Business Services Limited | Professional & scientific | 1991 |
| Cousins Investments Limited | Real estate | 2022 |
| Covely Technologies Ltd | Information & communication | 2026 |
| CPG Home Improvement & Property Maintenance Ltd | Construction | 2026 |
| Crafty Things Ltd | Wholesale & retail | 2023 |
| Cranleigh Court Limited | Real estate | 2007 |
| Crawford Yates Limited | Real estate | 2010 |
| Crazy Sexy Numbers Ltd | Wholesale & retail | 2026 |
| CRC Industries Emeia Services Limited | Financial services | 2023 |
| CRC Industries UK Limited | Manufacturing | 2003 |
| CRE8IT Productions Ltd | Administrative & support | 2025 |
| Creatapack Limited | Manufacturing | 1967 |
| Create Catering Equipment Limited | Wholesale & retail | 2018 |
| Create Data Systems Limited | Information & communication | 2014 |
| Create Fitness UK Limited | Arts & recreation | 2017 |
| Createfx Ltd | Information & communication | 2020 |
| Crescent Funeral Services Limited | Other services | 2016 |
| Crimson Hill Support Ltd | Health & social care | 2006 |
| Cristitopo Ltd | Construction | 2024 |
| Critical KIT Ltd | Wholesale & retail | 2020 |
| Croeso Family Holdings Ltd | Financial services | 2022 |
| Crommerhill Ltd | Real estate | 2019 |
| Crookie Holding Co Limited | Financial services | 2025 |
| Crossfields Farm Limited | Agriculture & fishing | 2022 |
| Crossfit Bridgwater Ltd | Arts & recreation | 2024 |
| Crossley M Limited | Wholesale & retail | 2024 |
| Crossmoor Construction Limited | Construction | 2009 |